CN102946199B - DC-isolation buck converter and busbar voltage testing circuit thereof - Google Patents
DC-isolation buck converter and busbar voltage testing circuit thereof Download PDFInfo
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- CN102946199B CN102946199B CN201210445829.3A CN201210445829A CN102946199B CN 102946199 B CN102946199 B CN 102946199B CN 201210445829 A CN201210445829 A CN 201210445829A CN 102946199 B CN102946199 B CN 102946199B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/25—Arrangements for measuring currents or voltages or for indicating presence or sign thereof using digital measurement techniques
- G01R19/2503—Arrangements for measuring currents or voltages or for indicating presence or sign thereof using digital measurement techniques for measuring voltage only, e.g. digital volt meters (DVM's)
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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
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- Dc-Dc Converters (AREA)
Abstract
The invention discloses a kind of DC-isolation buck converter, its busbar voltage testing circuit realizes the detection of DC-isolation buck converter busbar voltage by the secondary voltage of detection isolating transformer, need not extra isolating chip and can realize the isolation of high pressure and low pressure, circuit is simple, low cost.The DC-isolation buck converter of the present invention, it is analogue signal that its busbar voltage testing circuit can also realize a peak point voltage extracting PWM waveform by hardware circuit, realize both to detect DC-isolation decompression transformation high side bus voltage by digital control circuit, it is also possible to detect DC-isolation buck converter high side bus voltage by analog control circuit.The invention also discloses the busbar voltage testing circuit of a kind of DC-isolation buck converter.
Description
Technical field
The present invention relates to DC source technology, particularly to a kind of DC-isolation buck converter and busbar voltage detection electricity thereof
Road.
Background technology
One uncontrolled input direct voltage is for conversion into another controlled output DC voltage and is referred to as DC/DC
Conversion.Drive and in regeneration brake system at electric automobile, DC/DC changer and motor driver
Being the important step of system capacity flowing, DC/DC changer is by fixing for the direct voltage source such as battery, direct current generator straight
Stream voltage transformation becomes in check direct voltage output.
Switching mode DC/DC isolated variable circuit is by periodically controlling the logical of switching device (power semiconductor)
Break time or break-make frequency adjust output voltage or maintain output voltage constant, and fixing DC voltage conversion is become controlled
The direct voltage output of system.Common switching mode DC/DC (DC-to-DC) isolated variable circuit is as it is shown in figure 1, wrap
Include voltage conversion circuit, isolation inverter circuit, rectifying output circuit；Voltage conversion circuit input termination direct voltage source Ud,
For by controlling switch device conductive therein and turning off the DC voltage Ui controlling output to isolation inverter circuit
Size, thus control the size of the output DC voltage Uo of switching mode DC converting (DC/DC) circuit；Isolation inversion electricity
The output DC voltage Ui of the input termination voltage conversion circuit on road, for by the output DC voltage of voltage conversion circuit
Ui becomes high-frequency ac voltage and exports rectifying output circuit；Rectifying output circuit is for the height by isolation inverter circuit output
Frequently ac voltage rectifier, exports DC voltage Uo；Voltage conversion circuit generally has boost conversion circuit (Boost), fall
Pressure translation circuit (Buck), buck translation circuit (Buck-Boost), Cook translation circuit (Cuk) etc.；Conventional
Isolation inverter circuit have full-bridge type, semibridge system, push-pull type.Divide from the angle controlled, use analog control circuit
DC converter is analog DC converter, and the DC converter using digital control circuit is digital direct current conversion
Device.
Semibridge system isolation inverter circuit as in figure 2 it is shown, input direct voltage Ui, the first electric capacity C1, second electric capacity C2 hold
Measure equal and capacity is sufficiently large so that the current potential of two electric capacity junctions is the half of input direct voltage Ui, and
During circuit work, respectively the voltage at these electric capacity two ends remains Ui/2, drive control signal u of the 3rd switching device VT3g3Control
Make the break-make of the 3rd switching device VT3, drive control signal u of the 4th switching device VT4g4Control the 4th switching device
The break-make of VT4, the 3rd switching device VT3, the 4th switching device VT4 (in figure, two switching devices are field effect transistor, it is possible to
Use other power semiconductor switch) break-make rule be: each switch periods is Ts, and the first switch periods is only
Three switching device VT3 work, the 4th switching device VT4 keeps cut-off state, the 3rd switching device in the first switch periods
The conduction duration of VT3 is Ton, and the turn-off time is Toff, Ton+Toff=Ts；The second switch cycle is only the 4th
Switching device VT4 works, and the 3rd switching device VT3 keeps cut-off state, the 4th switching device VT4 in the second switch cycle
Conduction duration be Ton, the turn-off time is Toff, and the 3rd switching device VT3, the 4th switching device VT4 two open
Closing device alternation, during the 3rd switching device VT3 conducting, the voltage of transformator armature winding is-Ui/2, the 4th switch
During device VT4 conducting, the voltage of transformator armature winding is Ui/2.
Full-bridge type isolation inverter circuit as it is shown on figure 3, be semibridge system is isolated the first electric capacity C1 in inverter circuit, second
Electric capacity C2 replaces with the first switching device VT1, second switch device VT2, and is equipped with drive control signal, the first switch
Drive control signal u of device VT1g1, drive control signal u of second switch device VT2g2, the 3rd switching device VT3
Drive control signal ug3, drive control signal u of the 4th switching device VT4g4Control the logical of respective switch device respectively
Disconnected, this four switching device (in figure, this four switching device is field effect transistor, it is possible to use other power semiconductor switch)
Break-make rule be: each switch periods is Ts, and the first switch periods is only the 3rd switching device VT3, second switch device
Part VT2 works, and the 4th switching device VT4, the first switching device VT1 keep cut-off state, in the first switch periods the
Three switching device VT3, the conduction duration of second switch device VT2 are Ton, and the turn-off time is Toff, Ton+Toff
=Ts；The second switch cycle is only the 4th switching device VT4, the first switching device VT1 works, the 3rd switching device VT3,
Second switch device VT2 keeps cut-off state, the 4th switching device VT4, the first switching device VT1 in the second switch cycle
Conduction duration be Ton, the turn-off time is Toff, the 3rd switching device VT3 and second switch device VT2, the 4th
Switching device VT4 and two groups of switching device alternations of the first switching device VT1, the 3rd switching device VT3 and second opens
When closing device VT2 conducting, the voltage of transformator armature winding is-Ui, the 4th switching device VT4 and the first switching device VT1
During conducting, the voltage of transformator armature winding is Ui.
As shown in Figure 4, similar to semibridge system isolation inverter circuit is also the only the 3rd derailing switch to push-pull type isolation inverter circuit
Part VT3, two switching devices of the 4th switching device VT4, drive control signal u of the 3rd switching device VT3g3Control the
The break-make of three switching device VT3, drive control signal u of the 4th switching device VT4g4Control the 4th switching device VT4
Break-make, the 3rd switching device VT3, the 4th switching device VT4 (in figure, two switching devices are field effect transistor, it is possible to use
Other power semiconductor switch) break-make rule be: each switch periods is Ts, and the first switch periods the only the 3rd is opened
Closing device VT3 work, the 4th switching device VT4 keeps cut-off state, the 3rd switching device VT3 in the first switch periods
Conduction duration be Ton, the turn-off time is Toff, Ton+Toff=Ts；The second switch cycle is only the 4th switch
Device VT4 works, and the 3rd switching device VT3 keeps cut-off state, the 4th switching device VT4 in the second switch cycle
Conduction duration is Ton, and the turn-off time is Toff, the 3rd switching device VT3, the 4th switching device VT4 two switch
Device alternation, during the 3rd switching device VT3 conducting, electric current is upper from DC source positive inflow transformer armature winding
End, flows out from primary winding centre cap；During the 3rd switching device VT3 conducting, electric current just flows from DC source
Enter the lower end of primary winding, flow out from primary winding centre cap.
In electric/hybrid automobile, automobile-used DC/DC changer is by the voltage (such as 250V～430V) of high-tension battery
It is converted into the voltage (such as 10V～16V) of low tension battery, powers to low-voltage load, such as on-board air conditioner, sound equipment, electric motor car
Window etc..More than 1.2kW automobile-used DC/DC changer generally uses full-bridge isolated topology structure, and secondary is all wave rectification, as
Shown in Fig. 5, high-tension battery anode meets the first switching tube Q1, the 3rd switching tube Q3 by high voltage bus, and high-tension battery is born
End meet second switch pipe Q2, the 4th switching tube Q4 by ground wire, high voltage bus with being connected to bus capacitor C between ground wire, every
From transformator T primary side winding be connected on the first switching tube Q1, the contact of second switch pipe Q2 and the 3rd switching tube Q3, the 4th
Between the contact of switching tube Q4, within each cycle second switch pipe Q2, the 3rd switching tube Q3 and the first switching tube Q1,
4th switching tube Q4 alternate conduction, ON time is adjustable, be added to the voltage of isolating transformer primary side winding be amplitude be high
The alternation square wave of piezoelectric battery high pressure Ui.The 5th rectifier switch is connect respectively between two ends and the ground of isolating transformer vice-side winding
Pipe Q5, the 6th rectifier switch pipe Q6, the centre tap of isolating transformer vice-side winding is through the first inductance L1, the first electric capacity
C1 is concatenated into ground, the connection termination low tension battery anode of the same first electric capacity C1 of the first inductance L1, low tension battery negativing ending grounding,
The same first inductance L1 of first electric capacity C1 connects the end low-voltage output as Full-bridge isolated DC converter, exports low pressure
Uo is to low tension battery.In circuit, the control circuit of each switching tube is provided running voltage, low pressure by low pressure small-power accessory power supply
The power of small-power accessory power supply is generally several watts to tens watts, and circuit topology can be normal shock, flyback etc..
DC-isolation buck converter, needs to detect on high-tension side busbar voltage, becomes for DC-isolation blood pressure lowering
The duty of DC-isolation buck converter is adjusted by the control circuit chip of parallel operation.
The busbar voltage detection mode of common DC-isolation buck converter, is directly to be obtained by electric resistance partial pressure in high-pressure side
Arrive, owing to control circuit chip operation is in low-pressure side, high pressure must be carried out from car load security standpoint and isolate with low pressure,
In order to ensure the isolation of high pressure and low pressure, the busbar voltage detection signal demand obtained by electric resistance partial pressure in high-pressure side is passed through
AD (analog digital conversion) chip, isolating chip are transferred to the control chip of low-pressure side and it needs to increase to A/D chip and every
From the power supply of chip power supply, the busbar voltage detection mode of common DC-isolation buck converter, relatively costly, circuit
Complicated.It is additionally, since and high pressure (such as more than 300V) is obtained, by electric resistance partial pressure, the voltage that A/D chip can gather
(usual 0～5V), needs bigger divider resistance, and the intrinsic standoff ratio of resistance is relatively big, causes accuracy of detection to reduce, and rings
Answer overlong time.
Summary of the invention
The technical problem to be solved in the present invention is to provide a kind of DC-isolation buck converter and busbar voltage testing circuit thereof,
Circuit is simple, low cost.
For solving above-mentioned technical problem, the DC-isolation buck converter that the present invention provides, it includes isolating transformer, whole
Current circuit, busbar voltage testing circuit；
Described isolating transformer, the upper/lower terminal of vice-side winding connects two inputs of described rectification circuit respectively, secondary around
The centre tap of group is for connecing the anode of the direct voltage output of DC-isolation buck converter；
Described rectification circuit, outfan is for connecing the negative terminal of the direct voltage output of DC-isolation buck converter；
Described busbar voltage testing circuit, including the first resistance, the second resistance, the first diode, the second diode,
Three resistance, the first electric capacity, first input end, the second input；
Described first input end, the second input, for connecing the pair of the isolating transformer of DC-isolation buck converter respectively
The upper/lower terminal of limit winding；
Described first resistance, the first diode, be serially connected in described first input end between primary nodal point；Described 1st
The negative terminal of pole pipe is in primary nodal point side, and anode is in described first input end side；
Described second resistance, the second diode, be serially connected in described second input between primary nodal point；Described 2nd 2
The negative terminal of pole pipe is in primary nodal point side, and anode inputs side described second；
Described 3rd resistance, the first electric capacity, be connected in parallel on described primary nodal point between the ground of described busbar voltage testing circuit；
The ground of described busbar voltage testing circuit, for connecing the negative terminal of the direct voltage output of DC-isolation buck converter；
Described primary nodal point, for the busbar voltage of digital control circuit detection DC-isolation buck converter.
It is also preferred that the left described busbar voltage testing circuit, also include the 3rd diode, the second electric capacity, the 3rd electric capacity, first
Comparator, the first transistor, the 9th nmos switch pipe, the 4th resistance, the 5th resistance, the 6th resistance, the 7th resistance,
8th resistance, the 9th resistance, the tenth resistance；
Described 3rd diode, is just terminating primary nodal point, and negative terminal connects secondary nodal point；
Described second electric capacity, the 4th resistance, be connected in parallel on described secondary nodal point between the ground of described busbar voltage testing circuit；
Described 5th resistance, is connected on described secondary nodal point between described first comparator negative input end；
Described 6th resistance, is connected on described primary nodal point between described first comparator positive input terminal；
Described 7th resistance, is connected on described first comparator output terminal between the first pole of described the first transistor；
Second pole of described the first transistor connects one end of described 8th resistance, one end and the described 3rd of described 9th resistance
One end of electric capacity, the 3rd pole of described the first transistor connects the ground of described busbar voltage testing circuit；
Described the first transistor is NPN audion or nmos switch pipe；The base stage of the described first extremely NPN audion or
Nmos switch tube grid；The colelctor electrode of the described second extremely NPN audion or the drain electrode of nmos switch pipe；Described 3rd
The emitter stage of extremely NPN audion or the source electrode of nmos switch pipe；
Described 3rd electric capacity, another terminates the ground of described busbar voltage testing circuit；
Described 8th resistance, another terminates back work power supply；
Described 9th resistance, another terminates the grid of described 9th nmos switch pipe；
Described 9th nmos switch pipe, source electrode connects the ground of described busbar voltage testing circuit, and drain electrode connects described tenth resistance
One end；
Described tenth resistance, another terminates secondary nodal point；
Described secondary nodal point, detects DC-isolation buck converter for analog control circuit or digital control circuit
Busbar voltage.
It is also preferred that the left described busbar voltage testing circuit, also include the 4th Zener diode, the 5th Zener diode；
Described 4th Zener diode with the first resistance, the first diode be serially connected in described first input end to primary nodal point it
Between, the anode of described 4th Zener diode is in primary nodal point side, and negative terminal is in described first input end side；
Described 5th Zener diode with the second resistance, the second diode be serially connected in described second input to primary nodal point it
Between, the anode of described 5th Zener diode is in primary nodal point side, and negative terminal inputs side described second.
It is also preferred that the left described busbar voltage testing circuit, also include the 11st resistance, the 4th electric capacity；
Described 11st resistance, one terminates described secondary nodal point, and another terminates described 4th electric capacity one end；
Described 4th electric capacity, another terminates the ground of described busbar voltage testing circuit；
Described 11st resistance, with the junction point of the 4th electric capacity, is examined for analog control circuit or digital control circuit
Go out the busbar voltage of DC-isolation buck converter.
It is also preferred that the left DC-isolation buck converter, also include that bus capacitor, the first nmos switch pipe, the 2nd NMOS open
Guan Guan, the 3rd nmos switch pipe, the 4th nmos switch pipe；
Described rectification circuit, including the 5th NMOS rectifier switch pipe, the 6th NMOS rectifier switch pipe；
Described bus capacitor, be connected on high-voltage side bus with ground, high-pressure side between；
Described first nmos switch pipe, the drain electrode of the 3rd nmos switch pipe connect high-voltage side bus；
Described second nmos switch pipe, the source electrode of the 4th nmos switch pipe connect ground, high-pressure side；
Described first nmos switch pipe connects under described isolating transformer primary side winding with the junction point of the second nmos switch pipe
End；
The junction point of described 3rd nmos switch Guan Tong tetra-nmos switch pipe connects the upper of described isolating transformer primary side winding
End；
Described 5th NMOS rectifier switch pipe, drain electrode connects the lower end of described isolating transformer vice-side winding, and source electrode connects direct current
The negative terminal of the direct voltage output of isolated buck changer；
Described 6th NMOS rectifier switch pipe, drain electrode connects the upper end of described isolating transformer vice-side winding, and source electrode connects direct current
The negative terminal of the direct voltage output of isolated buck changer；
First nmos switch pipe, the second nmos switch pipe, the 3rd nmos switch pipe, the 4th nmos switch pipe, the 5th
The grid of NMOS rectifier switch pipe and the 6th NMOS rectifier switch pipe connects respective drive control signal respectively；
Within each cycle, second switch pipe, the 3rd switching tube and the first switching tube, the 4th switching tube alternate conduction.
It is also preferred that the left the first nmos switch pipe, the second nmos switch pipe, the 3rd nmos switch pipe, the 4th nmos switch
Being connected to a diode respectively between the source of pipe, leakage, the source electrode just terminating nmos switch pipe of this diode, negative terminal meets NMOS
The drain electrode of switching tube；
For solving above-mentioned technical problem, the busbar voltage testing circuit of the DC-isolation buck converter that the present invention provides, its
Including the first resistance, the second resistance, the first diode, the second diode, the 3rd resistance, the first electric capacity, the first input
End, the second input；
Described first input end, the second input, for connecing the pair of the isolating transformer of DC-isolation buck converter respectively
The two ends of limit winding；
Described first resistance, the first diode, be serially connected in described first input end between primary nodal point；Described 1st
The negative terminal of pole pipe is in primary nodal point side, and anode is in described first input end side；
Described second resistance, the second diode, be serially connected in described second input between primary nodal point；Described 2nd 2
The negative terminal of pole pipe is in primary nodal point side, and anode inputs side described second；
Described 3rd resistance, the first electric capacity are connected in parallel on described primary nodal point between the ground of described busbar voltage testing circuit；
The ground of described busbar voltage testing circuit, for connecing the negative terminal of the direct voltage output of DC-isolation buck converter；
Described primary nodal point, for the busbar voltage of digital control circuit detection DC-isolation buck converter.
It is also preferred that the left described busbar voltage testing circuit, also include the 3rd diode, the second electric capacity, the 3rd electric capacity, first
Comparator, the first transistor, the 9th nmos switch pipe, the 4th resistance, the 5th resistance, the 6th resistance, the 7th resistance,
8th resistance, the 9th resistance, the tenth resistance；
Described 3rd diode, is just terminating primary nodal point, and negative terminal connects secondary nodal point；
Described second electric capacity, the 4th resistance, be connected in parallel on described secondary nodal point between the ground of described busbar voltage testing circuit；
Described 5th resistance, is connected on described secondary nodal point between described first comparator negative input end；
Described 6th resistance, is connected on described primary nodal point between described first comparator positive input terminal；
Described 7th resistance, is connected on described first comparator output terminal between the first pole of described the first transistor；
First pole of described the first transistor connects one end of described 8th resistance, one end and the described 3rd of described 9th resistance
One end of electric capacity, the 3rd pole of described the first transistor connects the ground of described busbar voltage testing circuit；
Described 3rd electric capacity, another terminates the ground of described busbar voltage testing circuit；
Described 8th resistance, another terminates back work power supply；
Described 9th resistance, another terminates the grid of described 9th nmos switch pipe；
Described 9th nmos switch pipe, source electrode connects the ground of described busbar voltage testing circuit, and drain electrode connects described tenth resistance
One end；
Described tenth resistance, another terminates secondary nodal point；
Described secondary nodal point, detects DC-isolation buck converter for analog control circuit or digital control circuit
Busbar voltage.
It is also preferred that the left described busbar voltage testing circuit, also include the 4th Zener diode, the 5th Zener diode；
Described 4th Zener diode with the first resistance, the first diode be serially connected in described first input end to primary nodal point it
Between, the anode of described 4th Zener diode is in primary nodal point side, and negative terminal is in described first input end side；
Described 5th Zener diode with the second resistance, the second diode be serially connected in described second input to primary nodal point it
Between, the anode of described 5th Zener diode is in primary nodal point side, and negative terminal inputs side described second.
It is also preferred that the left described busbar voltage testing circuit, also include the 11st resistance, the 4th electric capacity；
Described 11st resistance, one terminates described secondary nodal point, and another terminates described 4th electric capacity one end；
Described 4th electric capacity, another terminates the ground of described busbar voltage testing circuit；
Described 11st resistance, with the junction point of the 4th electric capacity, is examined for analog control circuit or digital control circuit
Go out the busbar voltage of DC-isolation buck converter.
The DC-isolation buck converter of the present invention, its busbar voltage testing circuit secondary electricity by detection isolating transformer
The detection of the existing isolating transformer original edge voltage of compacting, i.e. the detection of DC-isolation buck converter busbar voltage, and be not required to
Wanting extra isolating chip can realize the isolation of high pressure and low pressure, circuit is simple, low cost.The DC-isolation of the present invention
Buck converter, its busbar voltage testing circuit can also realize only extracting the peak value of PWM waveform by hardware circuit
Point voltage is analogue signal, it is achieved both can carry out DC-isolation buck converter high-pressure side by digital control circuit female
The detection of line voltage, it is also possible to carry out DC-isolation buck converter high side bus voltage by analog control circuit
Detection.
Accompanying drawing explanation
In order to be illustrated more clearly that technical scheme, below the accompanying drawing used required for the present invention is made simple Jie
Continue, it should be apparent that, the accompanying drawing in describing below is only some embodiments of the present invention, for ordinary skill
From the point of view of personnel, on the premise of not paying creative work, it is also possible to obtain other accompanying drawing according to these accompanying drawings.
Fig. 1 is common switching mode DC/DC isolated variable circuit diagram；
Fig. 2 is common semibridge system isolation inverter circuit figure；
Fig. 3 is common full-bridge type isolation inverter circuit figure；
Fig. 4 is common push-pull type isolation inverter circuit figure；
Fig. 5 is common automobile-used DC/DC converter circuit figure；
Fig. 6 is the DC-isolation buck converter one embodiment schematic diagram of the present invention；
Fig. 7 is the busbar voltage testing circuit first embodiment schematic diagram of the DC-isolation buck converter of the present invention；
Fig. 8 is busbar voltage testing circuit the second embodiment schematic diagram of the DC-isolation buck converter of the present invention；
Fig. 9 is busbar voltage testing circuit the second embodiment schematic diagram of the DC-isolation buck converter of the present invention.
Detailed description of the invention
Below in conjunction with accompanying drawing, the technical scheme in the present invention is carried out clear, complete description, it is clear that described
Embodiment is a part of embodiment of the present invention rather than whole embodiments.Based on the embodiment in the present invention, ability
All other embodiments that territory those of ordinary skill is obtained on the premise of not making creative work, broadly fall into this
The scope of bright protection.
Embodiment one
DC-isolation buck converter, as shown in Figure 6, including isolating transformer T, rectification circuit, busbar voltage detection
Circuit；
Described isolating transformer T, the upper/lower terminal of vice-side winding connects two inputs of described rectification circuit, secondary respectively
The centre tap of winding is for connecing the anode of the direct voltage output of DC-isolation buck converter；
Described rectification circuit, outfan is for connecing the negative terminal of the direct voltage output of DC-isolation buck converter；
Described busbar voltage testing circuit, as it is shown in fig. 7, comprises the first resistance R1, the second resistance R2, the one or two pole
Pipe D1, the second diode D2, the 3rd resistance R3, the first electric capacity C1, first input end the 11, second input 12；
Described first input end the 11, second input 12, for connecing the isolation transformation of DC-isolation buck converter respectively
The upper/lower terminal of the vice-side winding of device T；
Described first resistance R1, the first diode D1, be serially connected in described first input end 11 and arrive between primary nodal point 13,
The negative terminal of described first diode D1 is in primary nodal point 13 side, and anode is in described first input end 11 side；
Described second resistance R2, the second diode D2, be serially connected in described second input 12 and arrive between primary nodal point 13,
The negative terminal of described second diode D2 is in primary nodal point 13 side, and anode is in described second input 12 side；
Described 3rd resistance R3, the first electric capacity C1, be connected in parallel on the primary nodal point 13 ground to described busbar voltage testing circuit
Between；
The ground of described busbar voltage testing circuit, for connecing the negative terminal of the direct voltage output of DC-isolation buck converter；
Described primary nodal point 13, for digital control circuit detection DC-isolation decompression converter circuit high-voltage side bus electricity
Pressure.
The DC-isolation buck converter of embodiment one, by electric resistance partial pressure and diode rectification by the PWM of transformer secondary
The positive and negative AC signal of (pulse width modulation) ripple signal is converted into unidirectional pwm pulse signal, due to DC-isolation blood pressure lowering
The on high-tension side busbar voltage of changer approximates the peak value of the transformation former limit upper/lower terminal voltage of isolating transformer T, and
The peak value of transformation secondary upper/lower terminal voltage over the ground is the former limit peak value 2 times of (transformer primaries divided by transformer turn ratio
Secondary no-load voltage ratio coefficient is k:1:1), so extracting transformer secondary over the ground by digital control circuit from primary nodal point 13
The crest voltage of the PWM ripple of signal can realize the detection of the on high-tension side busbar voltage of DC-isolation buck converter, no
Needing extra isolating chip can realize the isolation of high pressure and low pressure, circuit is simple, low cost.
Embodiment two
Based on embodiment one, the busbar voltage testing circuit of DC-isolation buck converter, as shown in Figure 8, including first
Resistance R1, the second resistance R2, the first diode D1, the second diode D2, the 3rd resistance R3, the first electric capacity C1；
Also include the 3rd diode D3, the second electric capacity C2, the 3rd electric capacity C3, the first comparator A1, the first transistor (NPN
Audion or nmos switch pipe), the 9th nmos switch pipe, the 4th resistance R4, the 5th resistance R5, the 6th resistance R6,
7th resistance R7, the 8th resistance R8, the 9th resistance R9, the tenth resistance R10；
Described first resistance R1, the first diode D1, be serially connected in described first input end 11 and arrive between primary nodal point 13,
The negative terminal of described first diode D1 is in primary nodal point 13 side, and anode is in described first input end 11 side；
Described second resistance R2, the second diode D2, be serially connected in described second input 12 and arrive between primary nodal point 13,
The negative terminal of described second diode D2 is in primary nodal point 13 side, and anode is in described second input 12 side；
Described 3rd resistance R3, the first electric capacity C1, be connected in parallel on the primary nodal point 13 ground to described busbar voltage testing circuit
Between；
Described 3rd diode D3, is just terminating primary nodal point 13, and negative terminal connects secondary nodal point 14；
Described second electric capacity C2, the 4th resistance R4, be connected in parallel on described secondary nodal point 14 to described busbar voltage testing circuit
Ground between；
Described 5th resistance R5, is connected on described secondary nodal point 14 and arrives between described first comparator A1 negative input end；
Described 6th resistance R6, is connected on described primary nodal point 13 and arrives between described first comparator A1 positive input terminal；
Described 7th resistance R7, is connected on the described first comparator A1 outfan the first pole (NPN to described the first transistor
The base stage of audion or the grid of nmos switch pipe) between；
Second pole (colelctor electrode of NPN audion or the drain electrode of nmos switch pipe) of described the first transistor connects the described 8th
One end of resistance R8, one end of described 9th resistance R9 and one end of described 3rd electric capacity C3, emitter stage meets described mother
The ground of line voltage detecting circuit；
Described 3rd electric capacity C3, another terminates the ground of described busbar voltage testing circuit；
Described 8th resistance R8, another termination back work power Vcc (such as 5V)；
Described 9th resistance R9, another terminates the grid of described 9th nmos switch pipe；
Described 9th nmos switch pipe, source electrode connects the ground of described busbar voltage testing circuit, and drain electrode connects described tenth resistance
One end of R10；
Described tenth resistance R10, another terminates secondary nodal point 14；
Described secondary nodal point, detects DC-isolation buck converter for analog control circuit or digital control circuit
High side bus voltage.
Due to the two ends voltage over the ground of isolating transformer T secondary be phase contrast be 180 degree, the dutycycle PWM less than 50%
Waveshape signal, is directly detected this signal higher to sampling request, cannot be detected by analog control circuit.Embodiment two
The busbar voltage testing circuit of DC-isolation buck converter, achieved by hardware circuit and only extract PWM waveform
The method of peak point voltage, it is achieved thereby that both DC-isolation buck converter can be detected by digital control circuit
High side bus voltage, it is also possible to by analog control circuit detection DC-isolation buck converter high-voltage side bus
Voltage.
In order to extract the crest voltage of the PWM ripple after rectification, the busbar voltage of the DC-isolation buck converter of embodiment two
Testing circuit, charges to the second electric capacity C2 by the 3rd diode D3 is unidirectional, and the signal of the 3rd diode D3 anode is
The pwm signal of certain dutycycle, negative terminal is direct current signal, and this direct current signal is equal to the peak value of the 3rd diode D3 anode
The difference of the forward voltage drop of voltage and the 3rd diode D3, gives the second electric capacity C2 charging in the positive period of PWM ripple, and negative
The anti-phase cut-off characteristics of diode is utilized, it is ensured that the electric charge of the second electric capacity C2 is not released in cycle.In order to direct current every
When the busbar voltage of buck converter declines, the electric charge of the second electric capacity C2 is discharged, the 9th resistance R9, the tenth
Resistance R10 and the 9th nmos switch pipe composition discharge loop, when DC/DC bus declines, this loop is by the second electric capacity
The electric charge of C2 discharges, the voltage of the secondary nodal point 14 connect when second electric capacity C2 one end and the 3rd diode D3's
When pressure drop sum is equal to the crest voltage of the primary nodal point 13 that first electric capacity C1 one end is connect, this discharge loop is closed,
The crest voltage change of primary nodal point 13 voltage of voltage follow the 3rd diode D3 of secondary nodal point 14.In order to detect
The raising and lowering of the busbar voltage of DC-isolation buck converter, the first comparator A1, the 5th resistance R5 and the 6th electricity
Resistance R6 composition busbar voltage rises down detection circuit, and this circuit comes real by the voltage at detection the 3rd diode D3 two ends in real time
Existing, when busbar voltage raises, the forward voltage drop that the 3rd diode D3 anode crest voltage deducts the 3rd diode D3 is big
In equal to negative terminal voltage, the first comparator A1 output and the 3rd diode D3 anode same switch frequency and PWM of dutycycle
Ripple, its amplitude is determined (such as 5V) by VCC, and when the buss voltage falls, the 3rd diode D3 anode crest voltage subtracts
Go the forward voltage drop of the 3rd diode D3 less than negative terminal voltage, the first comparator A1 output low level 0.7th resistance R7,
8th resistance R8, the 3rd electric capacity C3 and a NPN diode composition PWM testing circuit, first comparator A1 output and
During the PWM ripple of the 3rd diode D3 anode same switch frequency and dutycycle, i.e. show the anode peak of the 3rd diode D3
Threshold voltage deducts the forward voltage drop of the 3rd diode D3 and is more than or equal to negative terminal voltage, and now the first transistor is in switch shape
State, owing to the 3rd electric capacity C3 discharges far faster than charging, the voltage of the 3rd electric capacity is that low level is (by adjusting the 8th resistance
R8, the value of the 3rd electric capacity C3 can ensure that the 3rd electric capacity C3 both end voltage is less than 0.5V), therefore the in discharge loop
Nine nmos switch pipes are closed, and secondary nodal point 14 voltage follow primary nodal point 13 crest voltage raises and raises；When first
During comparator A1 output low level, show that the anode crest voltage of the 3rd diode D3 is just deducting the 3rd diode D3
To pressure drop less than negative terminal voltage, now the first transistor cut-off, the 3rd electric capacity C3 both end voltage passes through the 8th resistance R8 quilt
Working power (such as 5V) is charged as high level, is opened by the 9th nmos switch pipe in discharge loop, secondary nodal point 14
Voltage follow primary nodal point 13 crest voltage reduces and reduces, it is achieved the 3rd diode D3 negative terminal voltage follows anode in real time
The peak change of voltage, thus both can apply in the DC-isolation buck converter of digital control circuit by specific
Sampling policy realize the detection of the on high-tension side busbar voltage of DC-isolation buck converter from primary nodal point 13, it is also possible to
Apply and realized from described secondary nodal point 14 by analog circuit in the DC-isolation buck converter of analog control circuit
The detection of the on high-tension side busbar voltage of DC-isolation buck converter, it is not necessary to extra isolating chip can achieve high pressure
With the isolation of low pressure, circuit is simple, low cost.
Embodiment three, based on embodiment two, the busbar voltage testing circuit of DC-isolation buck converter, as it is shown in figure 9,
On the basis of shown in Fig. 8, increase the 4th Zener diode D4, the 5th Zener diode D5, the 11st resistance R11,
4th electric capacity C4；
Described 4th Zener diode D4 is serially connected in described first input end 11 with the first resistance R1, the first diode D1
Between primary nodal point 13, the negative terminal of described first diode D1 is in primary nodal point 13 side, and anode is described first defeated
Enter end 11 sides；The anode of described 4th Zener diode D4 is in primary nodal point 13 side, and negative terminal is at described first input end
11 sides；
Described 5th Zener diode D5, the second resistance R2, the second diode D2 are serially connected in described second input 12
Between primary nodal point 13, the negative terminal of described second diode D2 is in primary nodal point 13 side, and anode is described second defeated
Enter end 12 sides；The anode of described 5th Zener diode D5 is in primary nodal point 13 side, and negative terminal is at described first input end
12 sides；
Described 11st resistance R11, a termination secondary nodal point 14, another terminates one end of described 4th electric capacity C4；
Described 4th electric capacity C4, another terminates the ground of described busbar voltage testing circuit；
Described 11st resistance R11 is with the junction point of described 4th electric capacity C4, for analog control circuit or digital
The high side bus voltage of control circuit detection DC-isolation buck converter.
In embodiment three, gone here and there respectively by two inputs at the busbar voltage testing circuit of DC-isolation buck converter
Join two stabilivolts, flow through the quiescent current of busbar voltage testing circuit for reducing low tension battery.
Embodiment four, based on embodiment one, two or three, DC-isolation buck converter, as shown in Figure 6, including isolation
Transformator T, rectification circuit, busbar voltage testing circuit, also include bus capacitor C, the first nmos switch pipe Q1,
Two nmos switch pipe Q2, the 3rd nmos switch pipe Q3, the 4th nmos switch pipe Q4；
Described rectification circuit, including the 5th NMOS rectifier switch pipe Q5, the 6th NMOS rectifier switch pipe Q6；
Described bus capacitor, be connected on high-voltage side bus with ground, high-pressure side between；
Described first nmos switch pipe Q1, the drain electrode of the 3rd nmos switch pipe Q3 connect high-voltage side bus；
Described second nmos switch pipe Q2, the source electrode of the 4th nmos switch pipe Q4 connect ground, high-pressure side；
Described first nmos switch pipe Q1 connects the described former limit of isolating transformer T with the junction point of the second nmos switch pipe Q2
The lower end of winding；
Described 3rd nmos switch pipe Q3 connects the described former limit of isolating transformer T with the junction point of the 4th nmos switch pipe Q4
The upper end of winding；
Described 5th NMOS rectifier switch pipe Q5, drain electrode connects the lower end of described isolating transformer T vice-side winding, and source electrode connects
The negative terminal of the direct voltage output of DC-isolation buck converter；
Described 6th NMOS rectifier switch pipe Q6, drain electrode connects the upper end of described isolating transformer T vice-side winding, and source electrode connects
The negative terminal of the direct voltage output of DC-isolation buck converter；
First nmos switch pipe Q1, the second nmos switch pipe Q2, the 3rd nmos switch pipe Q3, the 4th nmos switch
Pipe Q4, the grid of the 5th NMOS rectifier switch pipe Q5 and the 6th NMOS rectifier switch pipe Q6 connect respective driving respectively and control
Signal processed；
Within each cycle, second switch pipe Q2, the 3rd switching tube Q3 and the first switching tube Q1, the 4th switching tube Q4
Alternate conduction, ON time is adjustable；
First nmos switch pipe Q1, the second nmos switch pipe Q2, the 3rd nmos switch pipe Q3, the 4th nmos switch
Being connected to a diode respectively between the source of pipe Q4, leakage, the source electrode just terminating nmos switch pipe of this diode, negative terminal connects
The drain electrode of nmos switch pipe；
First nmos switch pipe Q1, the second nmos switch pipe Q2, the 3rd nmos switch pipe Q3, the 4th nmos switch
Pipe Q4, the 5th NMOS rectifier switch pipe Q5 and the 6th NMOS rectifier switch pipe Q6 respective source consubstantiality end short circuit.
The centre tap of isolating transformer vice-side winding is through an inductance, a capacitance series to ground, and this inductance is with the company of this electric capacity
Connecing the anode holding the direct voltage output as this DC-isolation buck converter, output low-voltage DC is pressed onto low tension
Pond.In circuit, the control circuit of each switching tube is provided running voltage by low pressure small-power back work power supply.
The DC-isolation buck converter of the present invention, its busbar voltage testing circuit secondary electricity by detection isolating transformer
The detection of the existing isolating transformer original edge voltage of compacting, i.e. the detection of DC-isolation buck converter busbar voltage, and be not required to
Wanting extra isolating chip can realize the isolation of high pressure and low pressure, circuit is simple, low cost.The DC-isolation of the present invention
Buck converter, its busbar voltage testing circuit can also realize only extracting the peak value of PWM waveform by hardware circuit
Point voltage is analogue signal, it is achieved both can carry out DC-isolation buck converter high-pressure side by digital control circuit female
The detection of line voltage, it is also possible to carry out DC-isolation buck converter high side bus voltage by analog control circuit
Detection.
The foregoing is only presently preferred embodiments of the present invention, not in order to limit the present invention, all spirit in the present invention
Within principle, any modification, equivalent substitution and improvement etc. done, within should be included in the scope of protection of the invention.
Claims (8)
1. a DC-isolation buck converter, including isolating transformer, rectification circuit, busbar voltage testing circuit；
The upper/lower terminal of the vice-side winding of described isolating transformer connects two inputs of described rectification circuit respectively, secondary around
The centre tap of group is for connecing the anode of the direct voltage output of DC-isolation buck converter；
The outfan of described rectification circuit is for connecing the negative terminal of the direct voltage output of DC-isolation buck converter；
It is characterized in that,
Described busbar voltage testing circuit, including the first resistance, the second resistance, the first diode, the second diode,
Three resistance, the first electric capacity, first input end, the second input；
Described first input end, the second input, for connecing the pair of the isolating transformer of DC-isolation buck converter respectively
The upper/lower terminal of limit winding；
Described first resistance, the first diode, be serially connected in described first input end between primary nodal point；Described 1st
The negative terminal of pole pipe is in primary nodal point side, and anode is in described first input end side；
Described second resistance, the second diode, be serially connected in described second input between primary nodal point；Described 2nd 2
The negative terminal of pole pipe is in primary nodal point side, and anode inputs side described second；
Described 3rd resistance, the first electric capacity, be connected in parallel on described primary nodal point between the ground of described busbar voltage testing circuit；
The ground of described busbar voltage testing circuit, for connecing the negative terminal of the direct voltage output of DC-isolation buck converter；
Described primary nodal point, for the busbar voltage of digital control circuit detection DC-isolation buck converter；
Described busbar voltage testing circuit, also include the 3rd diode, the second electric capacity, the 3rd electric capacity, the first comparator,
The first transistor, the 9th nmos switch pipe, the 4th resistance, the 5th resistance, the 6th resistance, the 7th resistance, the 8th electricity
Resistance, the 9th resistance, the tenth resistance；
Described 3rd diode, is just terminating primary nodal point, and negative terminal connects secondary nodal point；
Described second electric capacity, the 4th resistance, be connected in parallel on described secondary nodal point between the ground of described busbar voltage testing circuit；
Described 5th resistance, is connected on described secondary nodal point between described first comparator negative input end；
Described 6th resistance, is connected on described primary nodal point between described first comparator positive input terminal；
Described 7th resistance, is connected on described first comparator output terminal between the first pole of described the first transistor；
Second pole of described the first transistor connects one end of described 8th resistance, one end and the described 3rd of described 9th resistance
One end of electric capacity, the 3rd pole of described the first transistor connects the ground of described busbar voltage testing circuit；
Described the first transistor is NPN audion or nmos switch pipe；The base stage of the described first extremely NPN audion or
Nmos switch tube grid；The colelctor electrode of the described second extremely NPN audion or the drain electrode of nmos switch pipe；Described 3rd
The emitter stage of extremely NPN audion or the source electrode of nmos switch pipe；
Described 3rd electric capacity, another terminates the ground of described busbar voltage testing circuit；
Described 8th resistance, another terminates back work power supply；
Described 9th resistance, another terminates the grid of described 9th nmos switch pipe；
Described 9th nmos switch pipe, source electrode connects the ground of described busbar voltage testing circuit, and drain electrode connects described tenth resistance
One end；
Described tenth resistance, another terminates secondary nodal point；
Described secondary nodal point, detects DC-isolation buck converter for analog control circuit or digital control circuit
Busbar voltage.
DC-isolation buck converter the most according to claim 1, it is characterised in that
Described busbar voltage testing circuit, also includes the 4th Zener diode, the 5th Zener diode；
Described 4th Zener diode with the first resistance, the first diode be serially connected in described first input end to primary nodal point it
Between, the anode of described 4th Zener diode is in primary nodal point side, and negative terminal is in described first input end side；
Described 5th Zener diode with the second resistance, the second diode be serially connected in described second input to primary nodal point it
Between, the anode of described 5th Zener diode is in primary nodal point side, and negative terminal inputs side described second.
DC-isolation buck converter the most according to claim 2, it is characterised in that
Described busbar voltage testing circuit, also includes the 11st resistance, the 4th electric capacity；
Described 11st resistance, one terminates described secondary nodal point, and another terminates described 4th electric capacity one end；
Described 4th electric capacity, another terminates the ground of described busbar voltage testing circuit；
Described 11st resistance, with the junction point of the 4th electric capacity, is examined for analog control circuit or digital control circuit
Go out the busbar voltage of DC-isolation buck converter.
4. according to the DC-isolation buck converter described in any one of Claim 1-3, it is characterised in that
DC-isolation buck converter, also include bus capacitor, the first nmos switch pipe, the second nmos switch pipe,
Three nmos switch pipes, the 4th nmos switch pipe；
Described rectification circuit, including the 5th NMOS rectifier switch pipe, the 6th NMOS rectifier switch pipe；
Described bus capacitor, be connected on high-voltage side bus with ground, high-pressure side between；
Described first nmos switch pipe, the drain electrode of the 3rd nmos switch pipe connect high-voltage side bus；
Described second nmos switch pipe, the source electrode of the 4th nmos switch pipe connect ground, high-pressure side；
Described first nmos switch pipe connects under described isolating transformer primary side winding with the junction point of the second nmos switch pipe
End；
The junction point of described 3rd nmos switch Guan Tong tetra-nmos switch pipe connects the upper of described isolating transformer primary side winding
End；
Described 5th NMOS rectifier switch pipe, drain electrode connects the lower end of described isolating transformer vice-side winding, and source electrode connects direct current
The negative terminal of the direct voltage output of isolated buck changer；
Described 6th NMOS rectifier switch pipe, drain electrode connects the upper end of described isolating transformer vice-side winding, and source electrode connects direct current
The negative terminal of the direct voltage output of isolated buck changer；
First nmos switch pipe, the second nmos switch pipe, the 3rd nmos switch pipe, the 4th nmos switch pipe, the 5th
The grid of NMOS rectifier switch pipe and the 6th NMOS rectifier switch pipe connects respective drive control signal respectively；
Within each cycle, second switch pipe, the 3rd switching tube and the first switching tube, the 4th switching tube alternate conduction.
DC-isolation buck converter the most according to claim 4, it is characterised in that
First nmos switch pipe, the second nmos switch pipe, the 3rd nmos switch pipe, the source of the 4th nmos switch pipe,
Being connected to a diode between leakage respectively, the source electrode just terminating nmos switch pipe of this diode, negative terminal connects nmos switch pipe
Drain electrode.
6. the busbar voltage testing circuit of a DC-isolation buck converter, it is characterised in that
Described busbar voltage testing circuit, including the first resistance, the second resistance, the first diode, the second diode,
Three resistance, the first electric capacity, first input end, the second input；
Described first input end, the second input, for connecing the pair of the isolating transformer of DC-isolation buck converter respectively
The two ends of limit winding；
Described first resistance, the first diode, be serially connected in described first input end between primary nodal point；Described 1st
The negative terminal of pole pipe is in primary nodal point side, and anode is in described first input end side；
Described second resistance, the second diode, be serially connected in described second input between primary nodal point；Described 2nd 2
The negative terminal of pole pipe is in primary nodal point side, and anode inputs side described second；
Described 3rd resistance, the first electric capacity are connected in parallel on described primary nodal point between the ground of described busbar voltage testing circuit；
The ground of described busbar voltage testing circuit, for connecing the negative terminal of the direct voltage output of DC-isolation buck converter；
Described primary nodal point, for the busbar voltage of digital control circuit detection DC-isolation buck converter；
Described busbar voltage testing circuit, also include the 3rd diode, the second electric capacity, the 3rd electric capacity, the first comparator,
The first transistor, the 9th nmos switch pipe, the 4th resistance, the 5th resistance, the 6th resistance, the 7th resistance, the 8th electricity
Resistance, the 9th resistance, the tenth resistance；
Described 3rd diode, is just terminating primary nodal point, and negative terminal connects secondary nodal point；
Described second electric capacity, the 4th resistance, be connected in parallel on described secondary nodal point between the ground of described busbar voltage testing circuit；
Described 5th resistance, is connected on described secondary nodal point between described first comparator negative input end；
Described 6th resistance, is connected on described primary nodal point between described first comparator positive input terminal；
Described 7th resistance, is connected on described first comparator output terminal between the first pole of described the first transistor；
Second pole of described the first transistor connects one end of described 8th resistance, one end and the described 3rd of described 9th resistance
One end of electric capacity, the 3rd pole of described the first transistor connects the ground of described busbar voltage testing circuit；
Described the first transistor is NPN audion or nmos switch pipe；The base stage of the described first extremely NPN audion or
Nmos switch tube grid；The colelctor electrode of the described second extremely NPN audion or the drain electrode of nmos switch pipe；Described 3rd
The emitter stage of extremely NPN audion or the source electrode of nmos switch pipe；
Described 3rd electric capacity, another terminates the ground of described busbar voltage testing circuit；
Described 8th resistance, another terminates back work power supply；
Described 9th resistance, another terminates the grid of described 9th nmos switch pipe；
Described 9th nmos switch pipe, source electrode connects the ground of described busbar voltage testing circuit, and drain electrode connects described tenth resistance
One end；
Described tenth resistance, another terminates secondary nodal point；
Described secondary nodal point, detects DC-isolation buck converter for analog control circuit or digital control circuit
Busbar voltage.
The busbar voltage testing circuit of DC-isolation buck converter the most according to claim 6, it is characterised in that
Described busbar voltage testing circuit, also includes the 4th Zener diode, the 5th Zener diode；
Described 4th Zener diode with the first resistance, the first diode be serially connected in described first input end to primary nodal point it
Between, the anode of described 4th Zener diode is in primary nodal point side, and negative terminal is in described first input end side；
Described 5th Zener diode with the second resistance, the second diode be serially connected in described second input to primary nodal point it
Between, the anode of described 5th Zener diode is in primary nodal point side, and negative terminal inputs side described second.
The busbar voltage testing circuit of DC-isolation buck converter the most according to claim 7, it is characterised in that
Described busbar voltage testing circuit, also includes the 11st resistance, the 4th electric capacity；
Described 11st resistance, one terminates described secondary nodal point, and another terminates described 4th electric capacity one end；
Described 4th electric capacity, another terminates the ground of described busbar voltage testing circuit；
Described 11st resistance, with the junction point of the 4th electric capacity, is examined for analog control circuit or digital control circuit
Go out the busbar voltage of DC-isolation buck converter.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201210445829.3A CN102946199B (en) | 2012-11-09 | 2012-11-09 | DC-isolation buck converter and busbar voltage testing circuit thereof |
| PCT/CN2012/087818 WO2014071674A1 (en) | 2012-11-09 | 2012-12-28 | Direct-current isolation buck convertor and bus voltage detection circuit thereof |
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|---|---|---|---|
| CN201210445829.3A CN102946199B (en) | 2012-11-09 | 2012-11-09 | DC-isolation buck converter and busbar voltage testing circuit thereof |
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| CN102946199B true CN102946199B (en) | 2016-10-12 |
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| CN117233455B (en) * | 2023-11-13 | 2024-02-06 | 湖南北顺源智能科技有限公司 | Modular high-voltage converter distributed sampling circuit system |
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| CN1571255A (en) * | 2004-04-30 | 2005-01-26 | 艾默生网络能源有限公司 | Synchronous rectification reverse-flow preventing circuit and method for parallel synchronous rectification converter |
| CN202940733U (en) * | 2012-11-09 | 2013-05-15 | 联合汽车电子有限公司 | Direct current insulation buck converter and matrix voltage detection circuit thereof |
Also Published As
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| WO2014071674A1 (en) | 2014-05-15 |
| CN102946199A (en) | 2013-02-27 |
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