CN208112509U - A kind of twin-stage input step-up DC constant voltage output converter - Google Patents
A kind of twin-stage input step-up DC constant voltage output converter Download PDFInfo
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- CN208112509U CN208112509U CN201820587454.7U CN201820587454U CN208112509U CN 208112509 U CN208112509 U CN 208112509U CN 201820587454 U CN201820587454 U CN 201820587454U CN 208112509 U CN208112509 U CN 208112509U
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Abstract
The utility model discloses a kind of twin-stage input step-up DC constant voltage output converter; it further include current potential virtual protection circuit, push-pull type boost topology circuit, output constant pressure automatic switch-over circuit including the input of 12V or 24V low-tension supply, auxiliary power circuit, automatic frequency switching circuit, PWM circuit for regulating and controlling, boosting output rectifier and filter.The utility model monitors current potential logic to be judged according to the different conditions of inlet highway voltage (under-voltage, over-voltage, normal), to by control PWM module and control the start and stop of entire circuit.The voltage output that output constant pressure automatic switch-over circuit ensures to have safety and stability under different input voltages.The high-frequency step-up transformer connect to push-pull topology has carried out special winding distribution design, to adapt to two different input voltages.There is constant voltage output when the output constant voltage circuit of the automatic switchover after step-up transformer may insure different inputs.
Description
Technical field
The utility model relates to constant voltage outputting circuit design fields more particularly to a kind of twin-stage to input booster type
DC constant voltage output converter.
Background technique
With the rise of the Renewable green energies such as photovoltaic power generation, inverter application and correlative study are increasingly extensive and deep
Enter.It is widely used in family, corporate server, satellite relay station even aerospace cause.Booster circuit is inversion electricity
The key index of one key component in source, its job stability, safety, response sensitivity etc. all affects entire inversion
The normal operation of power-supply system.
Multi input step-up DC constant voltage output converter is common component part in inverter.In booster circuit
In, it is common to use mode have：Push-Pull (push-pull type topology), Weinberg Circuit (Weinberg's circuit topology),
Half-Bridge (semibridge system topology), Full-Bridge (full-bridge type topology) etc. are several, wherein that the most commonly used is Push-
Pull (push-pull type topology).For these types of topology, input voltage is limited to narrow range to ensure that one is consolidated
Fixed transformation ratio, when input voltage varies widely, boosting output par, c voltage can be excessively high, may burn high voltage electric portion
Point.Although output voltage is excessively high can be achieved the purpose that set voltage output by PWM modulation, power supply conversion thus can be reduced
Efficiency (pulse width of PWM drive signal is very narrow at this time, leads to the reduction of power supply conversion ratio).Therefore in multi-input switch converter
Coupling scheme in, the corresponding respective circuit for power conversion of each input or by more complex control circuit, although fitting in this way
The case where when having answered different input voltages, but system schema higher cost, economy decline.
On the other hand, to guarantee that system operates normally, it need to judge the state of input signal in time to respond.With electricity
It presses signal as input, the under-voltage of input voltage, over-voltage and these three normal working conditions need to be judged, when detecting
Input voltage is abnormal, and when as under-voltage or over-voltage, system needs the protection of out of service or automatic implementation.Multi-voltage grade (following letter
Claim multistage) input when be also same reason, any input all the way requires to start corresponding safeguard measure in abnormal.Just
For multistage input logic judgement, current common microcontroller realizes function by software design, has response lag, at high cost
The disadvantages of.
Detect the state of multistage input voltage and carry out logic judgment generally there are two types of methods to realize, i.e., hardware circuit method and
Scm software programming method.
When using hardware circuit method, generally being compared detection to voltage signal by comparator obtains logic level, and
The logic level signal that will test afterwards is directly passed to logic compound circuit and carries out logic judgment, obtains a practical control
Signal supplies current potential and protects circuit.Pure hardware circuit is usually used in single input voltage state-detection.
When using scm software programming method, it is necessary to it first passes through analog-to-digital conversion module and sample detecting is carried out to voltage signal,
It is then programmed by scm software and carries out logic judgment, carry out the judgement of multi-level input signal with can be convenient.
Hardware circuit method and the response speed of scm software programming method are made by semiconductor material and working environment etc. simultaneously
About factor is influenced, and scm software programming method also suffers from the conversion essence of Singlechip clock signal and analog-to-digital conversion module
The influence of the restriction factor such as degree, sampled voltage range.
Although semiconductor devices is under present high speed development tide, the response speed of device is getting faster, due to
Scm software programming method is arrived in performance more by restraining factors relative to hardware circuit method.Therefore hardware circuit method is compared
It is more timely, sensitiveer to the response of the direct loic judgement of voltage signal in software programming method, and potential measurement range is wide, misses
Poor range is small, and the cost of implementation of integrated circuit is low.And in same performance, the response of scm software programming method can be not so good as
Hardware circuit method is timely, and is not easy to integrated, and the cost of implementation of integrated circuit is relatively high.
Utility model content
The purpose of this utility model is that the boost DC-DC constant pressure of the twin voltage input by research based on push-pull type topology
The key technology for exporting DC converter provides a kind of twin-stage input step-up DC constant voltage output converter, to overcome existing skill
Deficiency present in art.
The technical scheme in the invention for solving the technical problem is：A kind of twin-stage input step-up DC constant voltage output transformation
Device, including the input of 12V or 24V low-tension supply, auxiliary power circuit, automatic frequency switching circuit, PWM circuit for regulating and controlling, boosting it is defeated
Current rectifying and wave filtering circuit out, it is characterised in that：It further include current potential virtual protection circuit, push-pull type boost topology circuit, output constant pressure
Automatic switch-over circuit；The auxiliary power circuit is separately connected automatic frequency switching circuit, current potential virtual protection circuit, automatic frequency
Rate switching circuit ensures that PWM frequency is adapted to according to input voltage level adjustment oscillating circuit parameter, push-pull type Boost topology electricity
It routes pwm signal driving and is linked in sequence with output constant pressure automatic switch-over circuit, boosting output rectifier and filter；The output
Constant pressure automatic switch-over circuit includes push-pull transformer, change-over switch K1, switch driving circuit, and current rectifying and wave filtering circuit is described to push away
Pull transformer includes two circles by change-over switch K1 connection current rectifying and wave filtering circuit, the input winding of the push-pull transformer
Number is identical, has centre tapped winding, and output winding is the identical independent winding of two the number of turns, the switch driving electricity
Road includes triode, zener diode, resistance, capacitor, the anode tap connecting triode base stage of zener diode, zener diode
Cathode terminal DC power supply is connected to by resistance R2；The base circuit of triode is made of resistance R1 and capacitor C4 parallel connection, base
One end of polar circuit is grounded；The relay coil of the collector terminal connection change-over switch K1 of triode, and on relay coil
A sustained diode 7 in parallel, sustained diode 7 are connected to DC power supply with relay coil；Change-over switch K1 is double-pole
Double-throw type relay, normally-closed contact are separately connected the B of two output windings of push-pull transformer, C port, normally opened contact connection
A, the port D makes the armature of relay in release conditions, and two output winding ports of normally-closed contact connection are in internal short circuit state
And do not connect with current rectifying and wave filtering circuit, thus by two output windings in series outputs of push-pull transformer；And in the armature of relay
When attracting state, two output winding parallel outputs of push-pull transformer.
The a reference value of the zener diode is chosen in 15V between 21V.
The zener diode includes the zener diode D5 and D6 being connected in series, and is met：15V < (VD5+VD6) <
21V。
The current rectifying and wave filtering circuit includes diode D1-D4.
The current rectifying and wave filtering circuit includes two alminium electrolytic condensers in parallel.
The current potential virtual protection circuit includes comparator circuit, logic compound circuit, and the comparator circuit has n group ratio
Compared with device, n threshold point current potential U_set_1 ..., U_set_n, there are two comparators for every group of comparator to obtain 2n comparison
Output voltage U_out_1 ..., U_out_2n, input by comparison voltage U_in under-voltage and over-voltage sample be divided into two it is independent
Partial pressure type branch, under-voltage sampling partial pressure type branch includes resistance R1And R2, it includes resistance R that over-voltage, which samples partial pressure type branch,3And R4；
The reverse side of even number serial number comparator is connected and is accessed by R1And R2The bleeder circuit of composition, makes R1With R2The electricity obtained after partial pressure
Pressure is respectively fed to the reverse side of even number serial number comparator, and compared with the threshold potential of in-phase end, so that even number serial number compares
Device obtains in the road n per under-voltage condition all the way；The in-phase end of odd indexed comparator is connected and is accessed by R3With R4The partial pressure of composition
Circuit makes R3With R4The voltage obtained after partial pressure is respectively fed to the in-phase end of odd indexed comparator, and electric with the threshold value of reverse side
Position compares, and obtains odd indexed comparator in the road n per overvoltage condition all the way.
The logic compound circuit includes n group logic input signal, every group of logic input signal input by n two input or
Logic gate obtains n operation output signal, and n operation output signal is sent into and logic gate, finally obtains composite output signal U_
out。
Resistance R1、R2、R3、R4Parameter determines according to the following formula：
Wherein,
The utility model has the beneficial effects that：
1) the utility model proposes the scheme of the Switching Power Supply of power conversion one, design for 12V and 24V dual input
Current potential logic observation circuit, the winding distribution of high-frequency step-up transformer and corresponding output constant pressure automatically switch electric
Road.Current potential logic observation circuit can be judged according to the different conditions of inlet highway voltage (under-voltage, over-voltage, normal), from
And passes through control PWM module and control the start and stop of entire circuit.Output constant pressure automatic switch-over circuit ensures in different input voltages
Under have the voltage output of safety and stability.The high-frequency step-up transformer connect to push-pull topology has carried out special winding distribution and has set
Meter, to adapt to two different input voltages.The output constant voltage circuit of automatic switchover after step-up transformer may insure
There is constant voltage output when difference input.
The utility model uses pure hardware circuit design scheme, and response is fast, and high reliablity is not deposited during longtime running
" crash " problem of program in software.For dual input state, the compound window voltage comparator circuit of two-way is devised, it is real
Current potential virtual protection is showed；The winding construction of conventional push-pull boosting high frequency transformer is improved, and is devised matched
Constant pressure switching circuit；And for output constant pressure switching mode, propose series connection in parallel solution.These key technologies
Design scheme can be the effect of offering reference of actual engineer application.
The utility model uses modified window comparator, for the state-detection and logic judgment of multilevel voltage input
Circuit uses pure hardware design scheme, has response fastly, and high reliablity, there is no programs in software during longtime running
" crash " problem.Based on simple basic threshold voltage window comparator circuit, twin-stage window voltage comparator is analyzed, is designed
Twin-stage and multistage compound window voltage comparator, and be applied to the state-detection of 12V and 24V two-stage voltage input and patrol
In volume decision circuitry, by emulating and experiment confirms multistage composite type voltage window comparator reasonability and practicability, can be
The actual correlation engineering application effect of offering reference.
2) the above design scheme is applied in actual inverter, and (12V and 24V) carries out tight under different input voltages
The test of lattice has passed through transient response test when high power load.Dual input function, which reduces, strictly wants input power
It asks, there is practicability.
Detailed description of the invention
Fig. 1 is the push-pull transformer electrical block diagram of the utility model.
Fig. 2 is the schematic block circuit diagram of the utility model.
Fig. 3 is the serial or parallel connection output constant pressure conversion circuit figure of the utility model.
Fig. 4 is the serial or parallel connection output constant pressure conversion circuit principle of equal effects schematic diagram of the utility model, wherein Fig. 4 (a)
It is series connection output constant pressure conversion circuit equivalent schematic diagram, Fig. 4 (b) is parallel output constant pressure conversion circuit equivalent schematic diagram.
Fig. 5 is the circuit stages output characteristics figure of the utility model.
Fig. 6 is the multistage composite type window comparator circuit diagram of the utility model.
Fig. 7 is the logic compound circuit figure of the utility model.
Fig. 8 is the input twin voltage level logic protection circuit of the utility model.
Specific embodiment
The embodiments of the present invention are described below in detail, examples of the embodiments are shown in the accompanying drawings, wherein from beginning
Same or similar element or element with the same or similar functions are indicated to same or similar label eventually.Below by ginseng
The embodiment for examining attached drawing description is exemplary, and is only used for explaining the utility model, and should not be understood as to the utility model
Limitation.
In the description of the present invention, it should be understood that term " center ", " transverse direction ", "upper", "lower", " left side ",
The orientation or positional relationship of the instructions such as " right side ", "vertical", "horizontal", "inner", "outside" is orientation based on the figure or position
Relationship is merely for convenience of describing the present invention and simplifying the description, rather than the device or element of indication or suggestion meaning must
There must be specific orientation, be constructed and operated in a specific orientation, therefore should not be understood as limiting the present invention.Unless
It is otherwise noted, the meaning of " plurality " is two or more.
In the description of the present invention, it should be noted that unless otherwise clearly defined and limited, term " is pacified
Dress ", " connected ", " connection " should broadly understood, for example, it may be being fixedly connected；It may be a detachable connection or integral type
Connection；It can be mechanical connection, be also possible to be electrically connected；Can be directly connected, can also indirectly connected through an intermediary,
It can be the connection inside two elements.For the ordinary skill in the art, on can understanding as the case may be
Term is stated in the concrete meaning of the utility model.
Referring to Fig. 1-4, the utility model provides a kind of twin-stage input step-up DC constant voltage output converter, including 12V or
The input of 24V low-tension supply, auxiliary power circuit, automatic frequency switching circuit, PWM circuit for regulating and controlling, boosting output rectification filter electricity
Road, it is characterised in that：It further include current potential virtual protection circuit, push-pull type boost topology circuit, output constant pressure automatic switch-over circuit；
The auxiliary power circuit is separately connected automatic frequency switching circuit, current potential virtual protection circuit, automatic frequency switching circuit root
According to input voltage level adjustment oscillating circuit parameter to ensure that PWM frequency adapts to, push-pull type boost topology circuit is driven by pwm signal
It moves and is linked in sequence with output constant pressure automatic switch-over circuit, boosting output rectifier and filter；The output constant pressure automatically switches
Circuit includes push-pull transformer, change-over switch K1, switch driving circuit, current rectifying and wave filtering circuit, and the push-pull transformer is logical
Cross change-over switch K1 connection current rectifying and wave filtering circuit, the input winding of the push-pull transformer identical, band including two the number of turns
There is centre tapped winding, output winding is the identical independent winding of two the number of turns, and the switch driving circuit includes three poles
The cathode terminal of pipe, zener diode, resistance, capacitor, the anode tap connecting triode base stage of zener diode, zener diode is logical
It crosses resistance R2 and is connected to DC power supply；The base circuit of triode is made of resistance R1 and capacitor C4 parallel connection, and the one of base circuit
End ground connection；The relay coil of the collector terminal connection change-over switch K1 of triode, and on relay coil one in parallel it is continuous
Diode D7 is flowed, sustained diode 7 is connected to DC power supply with relay coil；Change-over switch K1 is double-pole double throw type relay
Device, normally-closed contact are separately connected the B of two output windings of push-pull transformer, C port, and normally opened contact connects the port A, D,
Make the armature of relay in release conditions, two output winding ports of normally-closed contact connection be in internal short circuit state and not with it is whole
Filter circuit connection is flowed, thus by two output windings in series outputs of push-pull transformer；And in armature of relay attracting state
When, two output winding parallel outputs of push-pull transformer.It is described in detail below：
It is common component part in inverter that multi-voltage grade, which inputs step-up DC constant voltage output converter,.This reality
The automatic constant-pressure switching circuit of 12V and 24V twin voltage grade (hereinafter referred to as twin-stage) input switch power supply are directed to novel emphasis
Design scheme.The voltage output that output constant pressure automatic switch-over circuit ensures to have safety and stability under different input voltages.Current potential is patrolled
Volume observation circuit can be judged according to the different conditions of inlet highway voltage (under-voltage, over-voltage, normal), to pass through control
The start and stop of PWM module and the entire circuit of control.
In push-pull topology (Push-Pull), transformer input, output winding are generally made of two groups of symmetric windings, and
Centre has tap.Symmetrical input winding, so that transformer core work is in third class working condition, electric source topology is being converted
Possess good magnetic core utilization rate in the process.It is U in input direct-current voltageiIn the case where, if transformation ratio is K, then output voltage
Meet Uo=Ui/K；If at this time by new DC voltage Ui'=2UiAs input, then this stylish output voltage meets Uo'=
Ui'/K=2Uo.As it can be seen that will generate over-voltage in different input voltages and export phenomenon.
In order to solve problem above, the output of the transformer of push-pull topology circuit is designed as two independent windings, such as Fig. 1
It is shown.And the serial or parallel connection mode of the independent output winding of switching two is gone by peripheral circuit, or pass through switching voltage-transformation
Device exports rectifier system corresponding to the alternating voltage of winding, so that circuit output is constant pressure, to solve over-voltage phenomenon.Transformation
The input winding of device is that the identical winding of two the number of turns is constituted, and has centre cap, uses n respectively11、n12Indicate the number of turns.Output
Winding is that the identical independent winding of two the number of turns is constituted, and uses n respectively21、n22Indicate the number of turns.Assuming that the number of turns n11=n12=N1, the number of turns
n21=n22=N2.According to known condition such as input voltage Ui, output voltage Uo, output power Po, PWM frequency f and duty ratio
D estimates efficiency eta, can solve coil current density j, and then chooses required transformer core specification and enamel-cover line footpath etc.
Parameter.N1、N2Value can be according to following equations：
There is constant electricity when the output constant voltage circuit of the automatic switchover after step-up transformer may insure different inputs
Pressure output, inputs applied to twin-stage in the booster circuit of inverter, and twin-stage inputs the booster circuit of inverter mainly by pushing away
Pull boost topology circuit, PWM circuit for regulating and controlling, current potential virtual protection circuit, automatic frequency switching circuit, output constant pressure are cut automatically
Change circuit, output overvoltage protection circuit, switching tube conduction voltage drop overcurrent protection circuit, boosting output rectifier and filter and auxiliary
Help a few part compositions such as power supply.Its master-plan block diagram such as Fig. 2.Low-tension supply (12V or 24V) is as entire power circuit
Input.Stable 15V and 5V, which are exported, by auxiliary power circuit is supplied to control circuit as power supply；Automatic frequency switching circuit
It can ensure that PWM frequency is adapted to according to input voltage level adjustment oscillating circuit parameter；Push-pull type booster circuit is by pwm signal
Driving is matched with output constant pressure automatic circuit, is judged automatically (12V or 24V) progress circuit according to input voltage and is cut
It changes, the square wave high pressure for being the constant 380V (virtual value) of output voltage by different low-voltage direct Input transformations, then passes through output
The rear class bus high pressure of 380V all the way is obtained after current rectifying and wave filtering circuit.
It further include overcurrent protection and overvoltage crowbar in entire design scheme, two-way protection circuit draws as feedback signal
Enter the enable end PWM.Current foldback circuit utilizes the inner resistance of transistor, by the conduction voltage drop electricity for monitoring crystal switch pipe
Pressure, judges whether there is overcurrent, short circuit phenomenon in boost process, if any then shutdown PWM output in time；And overvoltage crowbar is logical
The case where crossing monitoring output voltage has overpressure situation to immediately turn off PWM output.
The input winding of the connect transformer of push-pull type topology is two N1The winding of circle coil, output winding are two independences
The number of turns be N2Winding constitute.When input voltage is UiWhen, it is U that two output windings, which respectively export virtual value,oSquare wave electricity
Pressure；When input voltage is 2UiWhen, each output winding output virtual value is 2UoSquare-wave voltage.Based on this, following output is designed
The scheme that constant pressure automatically switches：
It is U in input voltage referring to Fig. 3iWhen=12V, two output winding inequalities connect to form a 2N2New output
Winding, in this way by the available 2U of transformer principle formulaoHigh voltage output；It is 2U in input voltageiWhen=24V, two outputs
One N of the corresponding formation in parallel of winding2The new output winding of circle is equally 2U by its available output of transformer principle formulao's
High pressure.Therefore, the principle of constant pressure is to design a serial and parallel switching circuit.
In Fig. 3, two output windings of step-up transformer have been connected to a dpdt relay, and relay coil K1 is logical
The 17.1V voltage status reverse circuit for crossing R2, D6, D5, R1, C4, Q1 composition is controlled.
When input terminal voltage (V-BAT) is lower than 17.1V (input 12V situation), Q1 base drive voltage is approximately 0V, not
It is able to satisfy triode ON condition, then the armature of relay is in release conditions (state of relay in Fig. 3), by circuit analysis
It is found that port ' OUT B ' and ' OUT C ' is in internal short circuit state, and does not have connection with rectification circuit, and port ' OUT at this time
A ' and ' OUT D ' as output, that is, by transformer two output windings in series output, i.e., the circle of the coil formed after series connection
Number is 2N2, therefore exporting virtual value is 2UoSquare-wave voltage, shown in the principle of equal effects such as Fig. 4 (a)；Similarly it is found that when input terminal electricity
When (V-BAT) being pressed to be higher than 17.1V (input 24V situation), Q1 base drive voltage is approximately that 0.7V (make by triode PN junction clamp
With, be equivalent to base stage to emitter connect a diode), meet triode ON condition, then the armature of relay be in inhale
Conjunction state, by circuit analysis it is found that port ' OUT A ' and ' OUT C ' and ' OUT B ' and ' OUT D ' is internal short in pairs at this time
Output is connect, that is, by two output winding parallel outputs of the same name of transformer, i.e., the number of turns of the coil formed after parallel connection is N2,
Exactly exporting virtual value is 2UoSquare-wave voltage, shown in the principle of equal effects such as Fig. 4 (b).So, also it is achieved that constant pressure
The purpose of conversion.
The program realizes the switching of constant voltage output for two different input voltages, in subsequent rectifier circuit portion,
Using bridge rectifier.It is used here four fast recovery diode RHRP8120 (D4, D3, D1, D2 in figure).It is exporting
Link is filtered, using two alminium electrolytic condensers (470uF/400V) in parallel, to obtain steady dc voltage output.
Referring to Fig. 5-8, current potential virtual protection circuit includes comparator circuit, logic compound circuit, it is characterised in that：It is described
Comparator circuit have n group comparator, n threshold point current potential U_set_1 ..., U_set_n, there are two comparators for every group of comparator
To obtain 2n relatively output voltage U_out_1 ..., U_out_2n, input adopted by the under-voltage and over-voltage of comparison voltage U_in
Sample is divided into two independent partial pressure type branches, and under-voltage sampling partial pressure type branch includes resistance R1And R2, over-voltage sampling partial pressure type branch
Including resistance R3And R4.By R1With R2The voltage obtained after partial pressure is respectively fed to even number serial number in Fig. 2 (A2, A4 ..., A 2n) ratio
Compared with the reverse side of device, and compared with the threshold potential of in-phase end, at this time even number serial number comparator obtain in the road n per all the way owe
Pressure condition (being under-voltage condition when output high level, be non-under-voltage condition when exporting low level)；By R3With R4The electricity obtained after partial pressure
Pressure is respectively fed to the in-phase end of odd indexed (A1, A3 ..., A (2n-1)) comparator, and compared with the threshold potential of reverse side
Compared with odd indexed comparator obtains (being overvoltage condition when output high level, exporting low per overvoltage condition all the way in the road n at this time
It is non-overvoltage condition when level).It is described in detail below：
The design of this circuit is divided into two parts, and a part is multistage composite type window comparator circuit, and another part is to patrol
Collect compound circuit.And its circuit output performance plot is as shown in Figure 5.
U_low_1, U_high_1 in Fig. 5, U_low_2, U_high_2 ..., U_low_n, U_high_n respectively indicate it is more
First order low-threshold power site, first order high threshold point current potential, second level Low threshold point current potential, the second level of grade input voltage are high
Threshold point current potential, n-th grade of Low threshold point current potential, (there are also the high-low threshold value point electricity of other ranks therebetween for n-th grade of high threshold point current potential
Position does not mark).Meanwhile threshold point current potential meets U_high_n>U_low_n>…> U_high_2>U_low_2>U_high_1>
U_low_1.If U_in<U_low_x, the then undervoltage condition being known as under corresponding xth grade；If U_low_x<U_in<U_high_x, then
Referred to as correspond to the normal condition under xth grade；If U_in>U_high_x, the then overpressure situation being known as under corresponding xth grade.
The structure of multistage composite type window comparator circuit is as shown in fig. 6, the structure of logic compound circuit is as shown in Figure 7.
Multistage composite type window comparator circuit have 2n comparator (A1, A2, A3, A4 ..., A (2n-1), A 2n), n
A threshold point current potential (U_set_1, U_set_2 ..., U_set_n), 2n relatively output voltage (U_out_1, U_out_2, U_
out_3、U_out_4、…、U_out_(2n-1)、U_out_2n)。
Here, by the threshold point current potential upper limit and the property of lower limit value it is found that n grades input in every level-one current potential the upper limit with
Lower limit value meets U_high_n>U_low_n>U_high_(n-1)>U_low_(n-1)>…>U_high_1> U_low_1.Together
When, each threshold point current potential of multistage composite type window comparator circuit should meet U_set_n>U_set_ (n-1)>…>U_
set_1。
This circuit, which will input to be sampled by the under-voltage and over-voltage of comparison voltage U_in, is divided into two independent partial pressure type branches.It owes
R in pressure sampling partial pressure type branch routing diagram1And R2Composition, over-voltage sample the R in partial pressure type branch routing diagram3And R4Composition.
By R1With R2The voltage obtained after partial pressure is respectively fed to the reverse side of even number serial number (A2, A4 ..., A 2n) comparator,
And compared with the threshold potential of in-phase end, even number serial number comparator is obtained in the road n per under-voltage condition (output height all the way at this time
It is under-voltage condition when level, is non-under-voltage condition when exporting low level)；By R3With R4The voltage obtained after partial pressure is respectively fed to Fig. 2
The in-phase end of middle odd indexed (A1, A3 ..., A (2n-1)) comparator, and compared with the threshold potential of reverse side, it is odd at this time
Number sequence comparator obtains (being overvoltage condition when output high level, being non-when exporting low level per overvoltage condition all the way in the road n
Overvoltage condition).Here, comparison output voltage (U_out_1, U_out_2, U_out_3, U_out_ that the road 2n comparator obtains
4 ..., U_out_ (2n-1), U_out_2n) it is compound by the logic of Fig. 2 logic circuit progress voltage, it can be obtained multistage all the way
Input the output of current potential logic judgment signal.
As it can be seen that lower limit value U_low_1, U_low_2 of the road n voltage input ..., U_low_n and upper limit value U_high_1,
U_high_2 ..., U_high_n become the threshold point current potential under equivalent under-voltage condition and overvoltage condition under corresponding input.Input
Voltage by after bleeder circuit value with U_set_1, U_set_2 ..., compared with U_set_n, be equivalent to input voltage directly and U_
Low_1, U_high_1, U_low_2, U_high_2 ..., U_low_n, U_high_n compare.Such method is under-voltage and overpressure zone
It is converted to two-way, only needs to may make up required current potential identification using n relatively threshold point current potential in circuit, this is also exactly
Circuit limit comparator circuits more than routine are on threshold point current potential where the few principle of required number.
The parameter of design determines according to the following formula：
Wherein
During designing determining parameter, U_low_1, U_high_1, U_low_2, U_high_2 ..., U_ are specified
low_n,U_high_n.Then can first determine set U_set_1, U_set_2 ..., the value of U_set_n, and then with
Upper formula determines R1、R2、R3、R4, realize the parameter setting to entire circuit.
Multistage composite type window comparator circuit arrangement, applied to 12V and 24V, both different input voltage steps are other
Electronic circuit.Obtain input twin voltage level logic protection circuit as shown in Figure 8.As shown, by input voltage (V-BAT)
Under-voltage and over-voltage sampling be divided into two independent partial pressure type branches.R in under-voltage sampling partial pressure type branch routing diagram1And R2Composition,
Over-voltage samples the R in partial pressure type branch routing diagram3And R4Composition.
Meanwhile under 12V input rank, under-voltage and overpressure value is respectively 10.5V and 15V；Under 24V input rank,
Its is under-voltage and overpressure value is respectively 21V and 30V.
By calculating, four resistance can value：
R1=24K ohm, R2=11K ohm, R3=39K ohm, R4=11K ohm.Two-way partial pressure type sampled signal difference
It is sent into four comparator units A, B, C, D of LM339 chip.Two zener diode (Zener diode, BZV55-B3V3) strings
The benchmark voltage of connection four comparators of composition, wherein the porcelain that each zener diode capacity in parallel is 10nF is situated between
Capacitor filters out interference signal of the benchmark voltage inside and outside circuit as high-frequency bypass capacitor.Because of LM339 comparator category
In " open-drain " output type, a resistance value has been added to be " pull-up " resistance of 2K ohm in the output end of each comparator unit, with true
Guarantor can export correct state.
The output of four comparators is connected to subsequent logic gates.Because the working characteristics of the CMOS logic chip, and
Its work, so the output end in each comparator has added level-one bleeder circuit again, makes input voltage reach this under 5V mode
The input standard of CMOS logic chip.By Fig. 2 circuit connection, when comparator output is high level, indicate that input voltage is being owed
Pressure or overvoltage condition；When comparator exports low level, indicate input voltage in reasonable working range.
It can analyze out, when the output end OA and OB of comparator unit A, B export high level, it is defeated to correspond to 12V battery
Fashionable over-voltage and under-voltage protection exports；And when output end OC and OD the output high level of comparator unit C, D, it respectively corresponds
Over-voltage and under-voltage protection when 24V battery inputs export.
Four road logical signal OA, OB, OC, OD are fed together one and meet logical expression " Control_out=OA
In the logic compound circuit of OD+OB+OC ", composite output signal Control_out is finally obtained.
While there has been shown and described that the embodiments of the present invention, those skilled in the art should understand that：
These embodiments can be carried out with a variety of variations, modification, replacement in the case where not departing from the principles of the present invention and objective
And modification, the scope of the utility model are limited by claim and its equivalent replacement, without changing made by creative work
Into etc., it should be included within the scope of protection of this utility model.
Claims (8)
1. a kind of twin-stage inputs step-up DC constant voltage output converter, including the input of 12V or 24V low-tension supply, accessory power supply electricity
Road, automatic frequency switching circuit, PWM circuit for regulating and controlling, boosting output rectifier and filter, it is characterised in that：It further include that current potential is patrolled
Series protection protection circuit, push-pull type boost topology circuit, output constant pressure automatic switch-over circuit；The auxiliary power circuit is separately connected certainly
Dynamic frequency switching circuit, current potential virtual protection circuit, automatic frequency switching circuit is according to input voltage level adjustment oscillating circuit
To ensure that PWM frequency adapts to, push-pull type boost topology circuit is driven by pwm signal and automatically switches electricity with output constant pressure parameter
Road, boosting output rectifier and filter are linked in sequence；
The output constant pressure automatic switch-over circuit includes push-pull transformer, change-over switch K1, switch driving circuit, rectifying and wave-filtering
Circuit, the push-pull transformer by change-over switch K1 connection current rectifying and wave filtering circuit, the input of the push-pull transformer around
Group includes that two the number of turns are identical, has centre tapped winding, and output winding is the identical independent winding of two the number of turns, institute
Stating switch driving circuit includes triode, zener diode, resistance, capacitor, the anode tap connecting triode base of zener diode
The cathode terminal of pole, zener diode is connected to DC power supply by resistance R2；The base circuit of triode is by resistance R1 and capacitor
C4 parallel connection is constituted, one end ground connection of base circuit；The relay coil of the collector terminal connection change-over switch K1 of triode, and
A sustained diode 7 in parallel, sustained diode 7 are connected to DC power supply with relay coil on relay coil；Conversion
Switch K1 is double-pole double throw type relay, and normally-closed contact is separately connected the B of two output windings of push-pull transformer, C port,
Normally opened contact connects the port A, D, makes the armature of relay in release conditions, and two output winding ports of normally-closed contact connection are in
It internal short circuit state and is not connect with current rectifying and wave filtering circuit, thus by two output windings in series outputs of push-pull transformer；And
In armature of relay attracting state, two output winding parallel outputs of push-pull transformer.
2. twin-stage inputs step-up DC constant voltage output converter according to claim 1, it is characterised in that：Two pole of pressure stabilizing
The a reference value of pipe is chosen in 15V between 21V.
3. twin-stage inputs step-up DC constant voltage output converter according to claim 2, it is characterised in that：Two pole of pressure stabilizing
Pipe includes the zener diode D5 and D6 being connected in series, and is met：15V < (VD5+VD6) < 21V.
4. according to claim 1 or 2 or 3 twin-stages input step-up DC constant voltage output converter, it is characterised in that：It is described whole
Flowing filter circuit includes diode D1-D4.
5. twin-stage inputs step-up DC constant voltage output converter according to claim 4, it is characterised in that：The rectifying and wave-filtering
Circuit includes two alminium electrolytic condensers in parallel.
6. twin-stage inputs step-up DC constant voltage output converter according to claim 1, it is characterised in that：The current potential logic
Protecting circuit includes comparator circuit, logic compound circuit, and the comparator circuit has n group comparator, n threshold point current potential U_
Set_1 ..., U_set_n, every group of comparator there are two comparator to obtain 2n comparison output voltage U_out_1 ...,
U_out_2n, input are divided into two independent partial pressure type branches, under-voltage sampling by the under-voltage and over-voltage sampling of comparison voltage U_in
Partial pressure type branch includes resistance R1And R2, it includes resistance R that over-voltage, which samples partial pressure type branch,3And R4；The reverse phase of even number serial number comparator
End connects and accesses by R1And R2The bleeder circuit of composition, makes R1With R2The voltage obtained after partial pressure is respectively fed to even number serial number ratio
Compared with the reverse side of device, and compared with the threshold potential of in-phase end so that even number serial number comparator obtain in the road n per all the way owe
Pressure condition；The in-phase end of odd indexed comparator is connected and is accessed by R3With R4The bleeder circuit of composition, makes R3With R4After partial pressure
To voltage be respectively fed to the in-phase end of odd indexed comparator, and compared with the threshold potential of reverse side, make odd indexed
Comparator obtains in the road n per overvoltage condition all the way.
7. twin-stage inputs step-up DC constant voltage output converter according to claim 6, it is characterised in that：The logic is compound
Circuit includes n group logic input signal, and it is defeated that every group of logic input signal input by n two input or logic gate obtains n operation
Signal out, n operation output signal is sent into and logic gate, finally obtains composite output signal U out.
8. twin-stage described according to claim 6 or 7 inputs step-up DC constant voltage output converter, it is characterised in that：Resistance R1、R2、
R3、R4Parameter determines according to the following formula：
Wherein,
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| CN201820587454.7U CN208112509U (en) | 2018-04-23 | 2018-04-23 | A kind of twin-stage input step-up DC constant voltage output converter |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108377099A (en) * | 2018-04-23 | 2018-08-07 | 顺德职业技术学院 | A kind of twin-stage input step-up DC constant pressure output translator |
| CN109787337A (en) * | 2019-01-28 | 2019-05-21 | 江苏森源电气股份有限公司 | Composite power supply formula wireless temperature-measuring sensor and its control method |
| CN109873560A (en) * | 2019-03-14 | 2019-06-11 | 北京宇航系统工程研究所 | A kind of high-power high stability boosting power supply system |
-
2018
- 2018-04-23 CN CN201820587454.7U patent/CN208112509U/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108377099A (en) * | 2018-04-23 | 2018-08-07 | 顺德职业技术学院 | A kind of twin-stage input step-up DC constant pressure output translator |
| CN108377099B (en) * | 2018-04-23 | 2023-06-16 | 顺德职业技术学院 | Two-stage input boost DC constant voltage output converter |
| CN109787337A (en) * | 2019-01-28 | 2019-05-21 | 江苏森源电气股份有限公司 | Composite power supply formula wireless temperature-measuring sensor and its control method |
| CN109787337B (en) * | 2019-01-28 | 2022-04-29 | 江苏森源电气股份有限公司 | Composite power supply type wireless temperature measuring sensor and control method thereof |
| CN109873560A (en) * | 2019-03-14 | 2019-06-11 | 北京宇航系统工程研究所 | A kind of high-power high stability boosting power supply system |
| CN109873560B (en) * | 2019-03-14 | 2020-07-14 | 北京宇航系统工程研究所 | High-power high-stability boosting power supply system |
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