CN100533937C - DC-AC converter for inhibiting surge current dynamically - Google Patents
DC-AC converter for inhibiting surge current dynamically Download PDFInfo
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- CN100533937C CN100533937C CNB2005101080409A CN200510108040A CN100533937C CN 100533937 C CN100533937 C CN 100533937C CN B2005101080409 A CNB2005101080409 A CN B2005101080409A CN 200510108040 A CN200510108040 A CN 200510108040A CN 100533937 C CN100533937 C CN 100533937C
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Abstract
The invention is concerned with an AC-DC conversion device, which can automatically control poured current. Add at least one control unit that made by a resistance and an electron switch in parallel connection at output end of commutating electrical source of AC-DC conversion device. Whether to add the resistance into loop is based on the close and joint of the electron switch. The latter is controlled by a detecting circuit of electric power intermit, while the circuit detects whether the wave periods of input end of AC current is normal. When the wave periods takes place the leak, such as power cut, the detecting circuit controls the electron switch from close to open by adding the resistance into loop. When open the machine again, it will control the poured current of any work condition, such as power cut, heat starting and quickly starting.
Description
Technical field
The invention relates to a kind of interchange that can initiatively suppress inrush current to direct current transducer, refer to especially a kind ofly can effectively be suppressed at the following AC/DC changeover switch that inrush current takes place of any working condition.
Background technology
As shown in figure 12, it is the AC/DC changeover switch part of a power supply unit front end, it includes one AC power is changed into the bridge rectifier 80 of DC power supply, be connected in inductance 81, power transistor 82, diode and the electric capacity 83 etc. of bridge rectifier 80 outputs, wherein power transistor 82 is to be controlled by a power factor and Wave-wide regulation controlled electric controller (power factor and PWM controller) 84.Wherein resistance R 1 and diode D1 are the auxiliary charging circuit of electric capacity 83, and it act as when power factor correction circuit does not move as yet, and suitable electric capacity 83 voltages are set up in the loop earlier thus, so that accessory power supply can proper operation.
Before the power supply unit start, possesses very big capacity because of electric capacity 83 is uncharged, inrush current (inrush current) can appear after start, for avoiding assembly to damage because of impacted by inrush current, traditional practice is to be connected in series a thermistor 85 between bridge rectifier 80 outputs and inductance 81, the two ends cross-over connection of this thermistor 85 has an electronic switch 86, with the opportunity in decision thermistor 85 incision loops, the keying of this electronic switch 86 is controlled by the inner accessory power supply that produces of power supply unit then.
Seeing also shown in Figure 13ly, is the standard boot sequential chart of a power supply unit, AC power V after start
ACBegin input, electric capacity 83 begins charging, its terminal voltage V via resistance 85, inductance 81, resistance R 1 and diode D1, D2
BulkRaise (curve shown in the figure is the state that is effectively limited at inrush current) gradually, wait to arrive more than the certain voltage value accessory power supply V
StandbyBegin to activate and raise gradually, wait to arrive setting voltage and after after a while, power supply unit just begins to supply output voltage V
OutSaid process is power supply unit normal boot-strap program.
And aforementionedly be used to control the electronic switch 86 whether thermistor 85 cuts electric power loop, controlled by aforesaid accessory power supply and interlock circuit.This electronic switch 86 is to be the open circuit shape before start, and meaning is that temperature-sensitive resistance 85 is to be serially connected between bridge rectifier 80 and the inductance 81, after start, though electric capacity 83 has big capacity, because of front end has thermistor 85, so can limit inrush current.Because inrush current only occurs in the moment after the start, after the normal activation of power supply unit, thermistor 85 must be by cutting off on the loop, otherwise will influence efficient, therefore after the accessory power supply in the power supply unit is set up, promptly control this electronic switch 86 and connect and transmit closed circuitly, DC power supply is delivered to inductance 81 by electronic switch 86 immediately, no longer passes through thermistor 85.
Aforementioned accessory power supply control electronic switch 86 break-makes of utilizing decide thermistor 85 whether to cut the loop, though and then the technology that inrush current takes place during the restriction start belong to feasible.But on work opportunity very big restriction and leak are arranged, particularly, aforementioned manner only is applicable to cold boot (turn off fully power supply after start again), when heat start shooting, and the thermogravimetric occasion of starting shooting again particularly, the possible complete failure of its effect.Reason is that electronic switch 86 is controlled by accessory power supply, according to shown in Figure 13, even AC power V
ACInterrupt accessory power supply V
StandbyWill continue for some time t4 ~ t6, in other words, at AC power V
ACInterrupt between the heat start, electronic switch 86 is still because of accessory power supply V
StandbyLasting supply and be closed circuit shape, this means that thermistor 85 is still cutting off loop state, when inrush current takes place, from can't utilizing thermistor 85 effectively to suppress.
And for example shown in Figure 14, the U.S. discloses the patent of invention case No. 20030035311, also one solution is proposed for the inrush current problem of AC/DC changeover switch, its built-up circuit is by AC power end AC L, and N is provided with a bridge rectifier 94, a voltage up converting circuit 120 in regular turn to rising between the power output end BULK, is serially connected with an electric capacity 33 and a current-limiting resistance 92 between the positive-negative power end; Wherein these current-limiting resistance 92 two ends cross-over connections have a switching transistor 119, and the grid of this switching transistor 119 then is connected to an inrush current control circuit 110.
This inrush current control circuit 110 is by many groups comparator 62,64,66,102,114 and one transistor 118 is formed, and wherein is positioned at two comparators 62 of front end, 64 inputs are by divider resistance 63,65,68,69 are connected with the output of aforementioned bridge rectifier 94, to detect the variation of its output current, when the current value of bridge rectifier 94 outputs is respectively organized comparator 62,64,66 through inrush current control circuit 110,102, after 114 comparisons, when judging it greater than a set point, inrush current takes place in expression, immediately by comparator 114 outputs one electronegative potential, make switching transistor 119 open circuits, current-limiting resistance 92 is cut with electric capacity 33 immediately and is connected, to suppress inrush current.
The inrush current when though preceding method also can be used for suppressing to start shooting.But the shortcoming of the above-mentioned practice is: electric capacity 33 terminal voltage BULK should slowly raise originally, after current-limiting resistance 92 incisions, electric current is multiplied by resistance, even rise sharply with voltage BULK moment, thereby causes electric capacity 33 terminal voltage BULK the overvoltage doubt to be arranged and influence the withstand voltage of electric capacity 33.
Summary of the invention
From the above, though the AC/DC changeover switch of existing power supply unit front end part has the solution of inrush current, start shooting again and the occasion of high-speed switch machine for thermogravimetric, lack active and effective safeguard function, so be further improved, and seek feasible solution.
Therefore, main purpose of the present invention provide a kind of can effectively be suppressed at any operating state following the interchange of inrush current takes place to direct current transducer.
For reaching the major technique means that aforementioned purpose takes is to make aforementioned interchange that direct current transducer is included:
One power rectifier circuit is in order to convert AC power to DC power supply;
At least one inhibition unit is to be located on the dc power output end of power rectifier circuit, and its one first resistance and switch by parallel connection is formed;
One voltage up converting circuit, form by an inductance, a power transistor and one first diode, one end of this inductance suppresses the unit by this and is connected with power rectifier circuit, and the other end of this inductance connects the positive pole of this first diode, and the negative pole of first diode is connected with an output capacitance;
One power breakdown circuit for detecting includes:
One AC synchronous signal detection circuit, its input is to be connected with AC power, this AC synchronous signal detection circuit comprises a bleeder circuit and an add circuit, this bleeder circuit is made up of two voltage dividers, and being connected to the two ends of AC power respectively, the dividing potential drop mid point of two voltage dividers is connected with add circuit;
One integrating circuit, its input are to be connected with the output of aforementioned add circuit;
One comparison circuit, it has two inputs, one input end is to be connected with the output of aforementioned integrating circuit, another input is a reference voltage end, and the output of comparison circuit is to be connected to the switch that suppresses the unit, and whether this power breakdown circuit for detecting detecting AC power cycle is normal, when the leakage situation appears in the AC power cycle, promptly produce the state that a signal change suppresses set switch in the unit, first resistance that suppresses the unit so as to order suppresses inrush current.
In addition, also can be to make aforementioned interchange that direct current transducer is included for reaching the major technique means that aforementioned purpose takes:
One power rectifier circuit is in order to convert AC power to DC power supply;
At least one inhibition unit is to be located on the dc power output end of power rectifier circuit, and its one first resistance and switch by parallel connection is formed;
One voltage up converting circuit, form by an inductance, a power transistor and one first diode, one end of this inductance suppresses the unit by this and is connected with power rectifier circuit, and the other end of this inductance connects the positive pole of this first diode, and the negative pole of first diode is connected with an output capacitance;
One power breakdown circuit for detecting comprises:
One AC synchronous signal detection circuit, its input is to be connected with AC power;
One integrating circuit, its input are to be connected with the output of aforementioned AC synchronous signal detection circuit;
One comparison circuit, comprise a first transistor and a Zener diode, connect this Zener diode on the base stage of this first transistor, and be connected with this integrating circuit output by this Zener diode, the collector electrode of the first transistor then is connected to the switch that suppresses the unit;
Whether this power breakdown circuit for detecting detecting AC power cycle is normal, when the leakage situation appears in the AC power cycle, promptly produces the state that a signal change suppresses set switch in the unit, and first resistance that suppresses the unit so as to order suppresses inrush current.
In addition, can also be to make aforementioned interchange that direct current transducer is included for reaching the major technique means that aforementioned purpose takes:
One power rectifier circuit is in order to convert AC power to DC power supply;
A plurality of inhibition unit is to be located on the dc power output end of power rectifier circuit, and each suppresses the unit and is made up of one first resistance and a switch of parallel connection;
One voltage up converting circuit, form by an inductance, a power transistor and one first diode, one end of this inductance is connected with power rectifier circuit by this a plurality of inhibition unit, and the other end of this inductance connects the positive pole of this first diode, and the negative pole of first diode is connected with an output capacitance;
Whether one power breakdown circuit for detecting is normal in order to the detecting AC power cycle;
One output voltage circuit for detecting, be to change in order to the output voltage that detecting exchanges direct current transducer, comprise one first comparator and one second comparator, the positive and negative input of each comparator is connected to respectively on the dividing potential drop node of one first bleeder circuit and one second bleeder circuit, each bleeder circuit is made up of several second resistance, wherein an end of first bleeder circuit is connected with the output of aforementioned interchange to direct current transducer, and an end of second bleeder circuit is connected with a reference voltage source;
One logic judging circuit, be to carry out logic determines according to the output signal of power breakdown circuit for detecting and output voltage circuit for detecting, according to the switch in its judged result control inhibition unit, this logic judging circuit comprises two and door and two not gates, each with door wherein an input be the output that is connected aforementioned electric power interrupt detection circuit, respectively then be connected with the output of second comparator with first comparator of output voltage circuit for detecting by a not gate respectively with another input of door.
In the aforementioned circuit design, be to establish the inhibition unit that is subjected to the control of power breakdown circuit for detecting with at least one, when the user does that thermogravimetric is started shooting again or close start fast, AC power is fallen several cycles with leakage, this phenomenon will be detected by the power breakdown circuit for detecting immediately, and then the switch that control suppresses in the unit transmits open circuit, makes resistance suppress the inrush current that is produced when starting shooting again immediately in the switchback loop, utilizes this design can effectively suppress inrush current under any operating state.
Description of drawings
Fig. 1 is the circuit diagram of a preferred embodiment of the present invention.
Fig. 2 is the working waveform figure of a preferred embodiment of the present invention.
Fig. 3 is another feasible circuit diagram of comparison circuit of power breakdown circuit for detecting in a preferred embodiment of the present invention.
Fig. 4 is a possible embodiments circuit diagram of electronic switch of the present invention.
Fig. 5 is the another possible embodiments circuit diagram of electronic switch of the present invention.
Fig. 6 is the circuit diagram of the another preferred embodiment of the present invention.
Fig. 7 is the circuit diagram of a feasible power breakdown circuit for detecting of the another preferred embodiment of the present invention.
Fig. 8 is the circuit diagram of the another feasible power breakdown circuit for detecting of the another preferred embodiment of the present invention.
Fig. 9 is the circuit diagram of a feasible power breakdown circuit for detecting again of the another preferred embodiment of the present invention.
Figure 10 is the one shots truth table of a feasible power breakdown circuit for detecting again of the another preferred embodiment of the present invention.
Figure 11 is the circuit diagram of another feasible power breakdown circuit for detecting of the another preferred embodiment of the present invention.
Figure 12 is a kind of known AC/DC changeover switch circuit diagram.
Figure 13 is the standard boot working waveform figure of power supply unit.
Figure 14 is that the U.S. discloses the circuit diagram of No. 20030035311 patent of invention interchange that case discloses to direct current transducer.
[primary clustering symbol description]
10--bridge rectifier 12--subsidiary loop
11--power factor and Wave-wide regulation controlled electric controller
20--first suppresses unit 30--second and suppresses the unit
40/40 '--the power breakdown circuit for detecting
41--comparison circuit 42--integrating circuit
43--AC synchronous signal detection circuit
The 44/45--optical coupler
51--power transistor 52--relay
61--optical coupler 62--first power transistor
The 63/64--transistor
65--second power transistor
71--output voltage circuit for detecting
The 72--logic judging circuit
80--bridge rectifier 81--inductance
82--power transistor 83--electric capacity
84--power factor and Wave-wide regulation controlled electric controller
85--thermistor 86--electronic switch
Embodiment
As shown in Figure 1, it is the detailed circuit diagram that the present invention cooperates a preferred embodiment of active power factor corrector use, mainly be to make the input of a power rectifier circuit that bridge rectifier constitutes 10 connect AC power L, N, so that convert AC power to DC power supply, be serially connected with one first on the dc power output end of this bridge rectifier 10 and suppress unit 20, one second suppresses unit 30, one inductance L and a diode D1, wherein inductance L is connected a power transistor Q with the terminals of diode D1, this power transistor Q grid is to be connected to power supply unit inner set a power factor and Wave-wide regulation controlled electric controller 11, and controlled by it, this power factor and Wave-wide regulation controlled electric controller 11 are further by resistance R set on the negative power end
SenseObtain a detecting current I
SenseBe connected with an output capacitance C again between diode D1 negative electrode and the negative power end
BulkIn present embodiment, to stride on this inductance L and the diode D1 and be provided with a subsidiary loop 12, this subsidiary loop 12 is made up of a resistance R 1 and a diode D2, one auxiliary charging loop is provided when main application is to start shooting, is beneficial to the rapid foundation of accessory power supply in the power supply unit.
The aforementioned again first inhibition unit 20 is by a resistance R
T1And an electronic switch SW1 forms this resistance R
T1Can be general resistance or thermistor, is to adopt thermistor in the present embodiment, and electronic switch SW1 is a normally open before start again, and after continuing to be retained to start, so that utilize thermistor R
T1Inrush current when suppressing start after the accessory power supply for the treatment of power supply unit inside is set up, promptly utilizes accessory power supply to control this electronic switch SW1 and transmits closed circuitly, and after shutdown, accessory power supply stops, and electronic switch SW1 also returns to and often opens shape.The aforementioned first inhibition unit 20 is that genus is known, and non-principal character of the present invention place, holds not being described in further detail.(present embodiment is beyond original first inhibition unit 20, new one second inhibition unit, 30 operate together that add, but its embodiment is not as limit, and this second inhibition unit 30 still can independently operate, inevitable and original first inhibition unit 20 operate together.)
This second inhibition unit 30 can be one or more, mainly still by a resistance R
T2And the electronic switch SW2 of a parallel connection forms this resistance R
T2Still can be general resistance or thermistor, is to adopt thermistor in the present embodiment.And with aforementioned first suppress unit 20 different be in: the second electronic switch SW2 that suppresses unit 30 is controlled by a power breakdown circuit for detecting 40, this power breakdown circuit for detecting 40 is after power supply unit is finished start, whether the string in order to the detecting AC power is normal period of wave, utilize the string of detecting AC power whether to miss period of wave, to judge whether electric power interrupts, the of short duration off-mode when particularly thermogravimetric is started shooting with the start of quick pass again.
This power breakdown circuit for detecting 40 mainly includes:
One comparison circuit 41 mainly is made of a comparator, and its anode input is to connect a reference voltage source Vref by a bleeder circuit, and to obtain a reference voltage level, its output then connects aforementioned electronic switch SW 2;
One integrating circuit 42, mainly resistance R c, capacitor C and the transistor Q2 by serial connection forms, and the tandem node of this resistance R c, capacitor C is the negative terminal input that is connected to comparison circuit 41, and its relative end in addition then is connected to a reference voltage source Vref and an earth terminal respectively;
One AC synchronous signal detection circuit 43, its input are to connect AC power L, and N, output then are connected to aforementioned integrating circuit 42.
In present embodiment, this AC synchronous signal detection circuit 43 is to be become by following column circuit banks:
One add circuit is by two resistance R 5, and R6 forms, and for lightning strike protection is provided, in the present embodiment, two resistance R 5, R6 is connected in series a diode D3 again respectively, and D4, two diode D3, the negative electrode of D4 connect altogether, and are connected to the base stage of transistor Q2 in the aforementioned integrating circuit 42;
One bleeder circuit, comprise two component depressors 431/432 respectively by divider resistance R1, R2/R3, R4 forms, it is divided into add circuit two inputs and AC power end L, between the N, with regard to the signal at transistor Q2 base stage place, be to utilize add circuit that AC power is rectified negative half-wave integrate (seeing also shown in Fig. 2 waveform A).
Detailed as described below as for the concrete operation principle whether power breakdown circuit for detecting 40 detecting string disappears period of wave:
Aforementioned AC synchronous signal detection circuit 43 is one zero to hand over circuit for detecting more basically, uses the generation synchronizing signal, and each AC power cycle can produce two synchronization pulses shown in Fig. 2 waveform A, utilizes this pulse wave signal integrating circuit 42 of resetting.If power interruptions is mains failure or moment jumping electricity reclosing again (RECLOSED) for example, it is unusual with the synchronizing signal of deciding frequency is occurred, can't be again with the fixed mode frequently integrating circuit 42 of resetting, make the output voltage of integrating circuit 42 surpass the preset reference value, can detect the AC power cycle and the leakage situation occur.
Integrating circuit 42 is to utilize reference voltage source Vref through resistance R c capacitor C to be charged again, disclose the charging voltage waveform that capacitor C is arranged as Fig. 2 waveform C, represent that as the rising edge c1 in the waveform capacitor C continues during charging and voltage edges up, the last last threshold voltage of capacitor C is reference voltage source Vref again, utilize this transistor Q2 to be connected in parallel on the two ends of capacitor C, when transistor Q2 conducting, the electric charge that capacitor C stores can be given out light (shown in the falling edge c2 of Fig. 2 waveform C), make its voltage become zero.By this, when AC power just often, the synchronizing signal of utilizing aforementioned AC power synchronous signal circuit for detecting 43 to be produced triggers the transistor Q2 conducting in the integrating circuit 42, make the capacitor C charging voltage all to be reset, cause the capacitor C charging voltage just often can not surpass default value at power supply in every half period.This makes comparison circuit 41 output potentials be maintained at high levels (shown in the waveform B of Fig. 2) all the time, that is does not work at this moment in the second inhibition unit 30.
Yet, when power supply is missed the cycle (as the d place leakage 5ms cycle of Fig. 2 waveform D), cycle leakage situation (as a1 ~ a2 place of Fig. 2 waveform A) also appears in synchronization pulse synchronously, transistor Q2 at this moment can't conducting, so capacitor C continues charging (shown in the c ' of Fig. 2 waveform C), causes capacitor C voltage to exceed default value immediately.
In present embodiment, this comparison circuit 41 is to be made of comparator, the capacitor C of aforementioned integrating circuit 42 is to be connected in its negative terminal input, the default value that surpasses comparator anode input setting when the charging voltage of capacitor C, comparison circuit 41 outputs transfer low level (shown in the b of Fig. 2 waveform B) to, to trigger the electronic switch SW2 of the aforementioned second inhibition unit 30, make thermistor R
T2The incision loop is used to suppress inrush current.
Since aforementioned electric power interrupt detection circuit 40 be with string period of wave whether normally as basis for estimation, reaction at once when string the leakage situation occurs period of wave, thereby can be in time with thermistor R
T2In the incision loop, the inrush current when starting shooting once more to limit power recovery in real time.So utilize the aforementioned safeguard measure can be in order to the inrush current that suppresses to be taken place in various work opportunity.
See also shown in Figure 4, aforementioned second suppresses the possible embodiments of set electronic switch SW2 in the unit 30, mainly form by a power transistor 51 and a relay 52, the grid of this power transistor 51 is to be connected with the output of aforementioned electric power interrupt detection circuit 40, its source electrode connects the coil of relay 52, and two contacts of relay 52 are cross-over connection thermistor R then
T2Two ends, when the output potential of power breakdown circuit for detecting 40 changes, also conducting or end of power transistor 51, thereby the break-make of decision relay 52 contacts.
As shown in Figure 5, it is the another possible embodiments of set electronic switch SW2 in the aforementioned second inhibition unit 30, mainly be to make the input of an optical coupler 61 be connected with one first power transistor 62,62 of this power transistors are controlled by aforementioned electric power interrupt detection circuit 40, these optical coupler 61 outputs then are connected with the grid of one second power transistor 65 by the transistor 63/64 of two serial connections, and the source drain cross-over connection that utilizes this second power transistor 65 is in thermistor R
T2Two ends.As aforementioned power breakdown circuit for detecting 40 output high potentials, the 62/65 equal conducting of the first/the second power transistor, thermistor R
T2Promptly cut off the loop; Otherwise if power breakdown circuit for detecting 40 outputs are transmitted electronegative potential, second power transistor 65 is opened a way because of ending, so make thermistor R
T2In the switchback loop.The SW2 electronic switch of previous embodiment is to utilize optical coupler to make isolated from power.
See also shown in Figure 6 again, it is the detailed circuit diagram of the another preferred embodiment of the present invention, its basic framework and last embodiment are roughly the same, difference be in: be used in two group second and suppress unit 30/30 ', and cooperate an output voltage comparison circuit 71 and a logic judging circuit 72 by judging output voltage V
BulkHeight, when power cycle generation leakage phenomena, control two second orders that suppress 30/30 ' incision loop, unit.Aforementioned again second suppresses unit 30/30 ' is one it still can cooperate first to suppress unit 20 utilizations or independent running when above that present embodiment is its operation principle of formal specification with independent running:
Aforementioned output voltage comparison circuit 71 is made up of two groups of comparator M1, M2, its positive and negative terminal input is connected to the dividing potential drop nodes X 1 of two bleeder circuits 711/712 respectively, X2, Y1, on the Y2, two bleeder circuits 711/712 are to be made up of several resistance R 10 ~ R12, R13 ~ R15 respectively, its respectively with the aforementioned output V that exchanges direct current transducer
BulkAnd reference voltage source Vref connects.
Detailed as described below as for the operation principle of previous embodiment:
When the power supply unit start initial stage, aforementioned interchange is to the output voltage V of direct current transducer
BulkVery low, therefore the anode input current potential of two groups of comparator M1, M2 is higher than the negative terminal input in the output voltage comparison circuit 71, so its output is a high potential, thereby 72 liang of logic judging circuits and door AND1, an AND2 output electronegative potential, and two electronic switch SW2, SW2 ' also are open circuit, so two second thermistor RT2, the RT2 ' that suppress unit 30/30 ' all cut the loop, in order to the restriction inrush current.
When the output voltage V that exchanges direct current transducer
BulkRaise gradually, nodes X 2 voltages are higher than node Y2 in the bleeder circuit 711/712, so comparator M2 output electronegative potential, and corresponding and door AND2 output high potential, cause the power transistor conducting among the electronic switch SW2 ', relay tip is also connected, and with thermistor RT2 ' short circuit.
When power supply generation leakage during the cycle, power breakdown circuit for detecting 40 output electronegative potentials, two and door AND1, an AND2 output electronegative potential of logic judging circuit 72, cause the relay tip among two electronic switch SW2, the SW2 ' all to be open circuit, two thermistor RT2, RT2 ' are all cut in the loop, the inrush current that is produced during with the inhibition power up.
If power supply is kept normally, power breakdown circuit for detecting 40 still continues monitoring power electric and disruption whether occurs, and normality output high potential, and leakage takes place to interrupt during the cycle, according to output voltage V at electric power
BulkThe variation of magnitude of voltage cooperates aforementioned output voltage comparison circuit 71 and logic judging circuit 72 interimly thermistor RT2, RT2 ' to be cut the loop, the inrush current during for the inhibition power recovery.
From the above, cooperating second to suppress unit 30 control thermistors and whether cut the loop by a power breakdown circuit for detecting 40, is technological core of the present invention place, below sincerely proposes explanation at several embodiment of this power breakdown circuit for detecting 41:
As shown in Figure 7, this power breakdown circuit for detecting 40 is different with last embodiment be in: this AC synchronous signal detection circuit 43 is to be made of a transformer T and an add circuit, its primary side is and AC power L, N connects, secondary side is connected with integrating circuit 42 by this add circuit again, mat transformer T can produce a synchronous pulse wave with the AC power conversion equally, for the usefulness of replacement integrating circuit 42.
The AC synchronous signal detection circuit 43 of power breakdown circuit for detecting 40 as shown in Figure 8 is made up of a transformer T and two comparator G1, G2, utilizes two comparator G1, G2 to carry out zero and hands over more, to produce synchronization pulse.
The AC synchronous signal detection circuit 43 of power breakdown circuit for detecting 40 as shown in Figure 9 is made up of a transformer T, a comparator H and an one shots U1, can produce square wave with the power supply same frequency at comparator H output, the positive edge of its square wave and negative edge trigger one shots U1 respectively, produce synchronization pulse, the truth table of this one shots U1 is as shown in figure 10, and these compositions of mat also can be used for producing synchronization pulse.
Disclose the power breakdown circuit for detecting 40 ' that another kind of embodiment is arranged as shown in figure 11, different with prostatitis embodiment be in: this AC synchronous signal detection circuit 43 is made up of two groups of optical couplers 44/45, its the two input respectively with AC power end L, N connects, its output then is connected to an integrating circuit 42 that is made of capacitor C jointly, integrating circuit 42 is connected with comparison circuit 41 again, owing to be to constitute coupling between the optical coupler 44/45 I/O end with optical diode and photistor, when the AC power cycle does not have leakage, the charging voltage of set capacitor C will periodically be discharged on the integrating circuit 42, only when leakage appears in the AC power cycle, photistor is in not conducting during this period, capacitor C promptly continues charging, its voltage continues to raise, and when waiting to be higher than the reference voltage level of comparison circuit 41, comparison circuit 41 is promptly sent an electronegative potential, make second thermistor that suppresses unit 30 cut the loop, the inrush current that is produced during with the inhibition power up.
And aforementioned output voltage circuit for detecting 71 and logic judging circuit 72 more can be made of microprocessor, and easier realization suppresses the purpose of unit and multistage incision more.
From the above, whether the present invention utilizes the string of power breakdown circuit for detecting detecting AC power normal period of wave, to determine second thermistor that suppresses the unit whether in the switchback loop, inrush current during with the inhibition start, utilize this design to remedy to adopt single inhibition unit in time reaction heat repeat to start shooting and close the defective of starting shooting fast, because the AC power string leakage period of wave situation that thermogravimetric is started shooting again and the start of quick pass is caused can be the power breakdown circuit for detecting and detects immediately, thereby control second thermistor that suppresses unit switchback loop in real time, no matter thereby the inrush current that is taken place under which kind of working condition all can be suppressed effectively, and the stability of power supply unit is guaranteed.This shows that the present invention has possessed outstanding technical characterictic and obvious improvement compared to the inrush current inhibition technology of existing AC/DC changeover switch, and has met the patent of invention important document, therefore mentions application in accordance with the law.
Claims (14)
1. an interchange is characterized in that direct current transducer, includes:
One power rectifier circuit is in order to convert AC power to DC power supply;
At least one inhibition unit is to be located on the dc power output end of power rectifier circuit, and its one first resistance and switch by parallel connection is formed;
One voltage up converting circuit, form by an inductance, a power transistor and one first diode, one end of this inductance suppresses the unit by this and is connected with power rectifier circuit, and the other end of this inductance connects the positive pole of this first diode, and the negative pole of first diode is connected with an output capacitance;
One power breakdown circuit for detecting includes:
One AC synchronous signal detection circuit, its input is to be connected with AC power, this AC synchronous signal detection circuit comprises a bleeder circuit and an add circuit, this bleeder circuit is made up of two voltage dividers, and being connected to the two ends of AC power respectively, the dividing potential drop mid point of two voltage dividers is connected with add circuit;
One integrating circuit, its input are to be connected with the output of aforementioned add circuit;
One comparison circuit, it has two inputs, one input end is to be connected with the output of aforementioned integrating circuit, another input is a reference voltage end, and the output of comparison circuit is to be connected to the switch that suppresses the unit, and whether this power breakdown circuit for detecting detecting AC power cycle is normal, when the leakage situation appears in the AC power cycle, promptly produce the state that a signal change suppresses set switch in the unit, first resistance that suppresses the unit so as to order suppresses inrush current.
2. interchange as claimed in claim 1 is to direct current transducer, it is characterized in that this comparison circuit includes a comparator, an input of comparator connects the output of integrating circuit, another input is this reference voltage end, and the output of comparator then connects the switch that suppresses the unit;
This integrating circuit includes an electric capacity, one second resistance and a first transistor, one end of this electric capacity connects a reference voltage source by this second resistance and connects the collector electrode of this first transistor simultaneously, the other end of this electric capacity connects the emitter of this first transistor, and the base stage of this first transistor is the output that connects aforementioned add circuit.
3. interchange as claimed in claim 2 is to direct current transducer, it is characterized in that, this add circuit comprises two the 3rd resistance and two second diodes, one end of these two the 3rd resistance is connected with this first transistor base stage by two second diodes respectively, and the other end of these two the 3rd electricity groups connects the mid point of these two voltage dividers in this AC synchronous signal detection circuit respectively.
4. an interchange is characterized in that direct current transducer, includes:
One power rectifier circuit is in order to convert AC power to DC power supply;
At least one inhibition unit is to be located on the dc power output end of power rectifier circuit, and its one first resistance and switch by parallel connection is formed;
One voltage up converting circuit, form by an inductance, a power transistor and one first diode, one end of this inductance suppresses the unit by this and is connected with power rectifier circuit, and the other end of this inductance connects the positive pole of this first diode, and the negative pole of first diode is connected with an output capacitance;
One power breakdown circuit for detecting comprises:
One AC synchronous signal detection circuit, its input is to be connected with AC power;
One integrating circuit, its input are to be connected with the output of aforementioned AC synchronous signal detection circuit;
One comparison circuit, comprise a first transistor and a Zener diode, connect this Zener diode on the base stage of this first transistor, and be connected with this integrating circuit output by this Zener diode, the collector electrode of the first transistor then is connected to the switch that suppresses the unit;
Whether this power breakdown circuit for detecting detecting AC power cycle is normal, when the leakage situation appears in the AC power cycle, promptly produces the state that a signal change suppresses set switch in the unit, and first resistance that suppresses the unit so as to order suppresses inrush current.
5. an interchange is characterized in that direct current transducer, includes:
One power rectifier circuit is in order to convert AC power to DC power supply;
A plurality of inhibition unit is to be located on the dc power output end of power rectifier circuit, and each suppresses the unit and is made up of one first resistance and a switch of parallel connection;
One voltage up converting circuit, form by an inductance, a power transistor and one first diode, one end of this inductance is connected with power rectifier circuit by this a plurality of inhibition unit, and the other end of this inductance connects the positive pole of this first diode, and the negative pole of first diode is connected with an output capacitance;
Whether one power breakdown circuit for detecting is normal in order to the detecting AC power cycle;
One output voltage circuit for detecting, be to change in order to the output voltage that detecting exchanges direct current transducer, comprise one first comparator and one second comparator, the positive and negative input of each comparator is connected to respectively on the dividing potential drop node of one first bleeder circuit and one second bleeder circuit, each bleeder circuit is made up of several second resistance, wherein an end of first bleeder circuit is connected with the output of aforementioned interchange to direct current transducer, and an end of second bleeder circuit is connected with a reference voltage source;
One logic judging circuit, be to carry out logic determines according to the output signal of power breakdown circuit for detecting and output voltage circuit for detecting, according to the switch in its judged result control inhibition unit, this logic judging circuit comprises two and door and two not gates, each with door wherein an input be the output that is connected aforementioned electric power interrupt detection circuit, respectively then be connected with the output of second comparator with first comparator of output voltage circuit for detecting by a not gate respectively with another input of door.
6. interchange as claimed in claim 5 is characterized in that to direct current transducer this output voltage circuit for detecting and logic judging circuit are made of a microprocessor.
As claim 5 or 6 described interchanges to direct current transducer, it is characterized in that this power breakdown circuit for detecting includes an AC synchronous signal detection circuit, one the 3rd comparator and an integrating circuit;
On one input of the 3rd comparator this integrating circuit is set, another input of the 3rd comparator is a reference voltage end, and the output of its 3rd comparator then connects this logic judging circuit, wherein:
Integrating circuit is to make an electric capacity one end connect reference voltage source by one the 3rd resistance, and an end of this electric capacity connects the collector electrode of a first transistor, the other end of this electric capacity connects the emitter of this first transistor, and the base stage of this first transistor is to connect the AC power end by this AC synchronous signal detection circuit.
As 7 described interchanges of claim the to direct current transducer, it is characterized in that, this AC synchronous signal detection circuit is made up of a bleeder circuit and an add circuit, the bleeder circuit of this AC synchronous signal detection circuit comprises two voltage dividers, and be connected to the two ends of AC power respectively, the dividing potential drop mid point of two voltage dividers is connected with add circuit, and the add circuit output is the first transistor base stage that is connected to integrating circuit.
9. interchange as claimed in claim 8 is characterized in that to direct current transducer this add circuit includes two second diodes, and these two second diodes are connected with the first transistor base stage.
10. interchange as claimed in claim 7 is characterized in that to direct current transducer this AC synchronous signal detection circuit comprises a transformer and an add circuit, and this transformer primary side connects the AC power end, and secondary side is connected with integrating circuit by add circuit.
11. interchange as claimed in claim 7 is to direct current transducer, it is characterized in that, this AC synchronous signal detection circuit comprises a transformer, one the 4th comparator and one the 5th comparator, this transformer primary side is to connect the AC power end, secondary side is the input that is connected to the 4th comparator and the 5th comparator respectively, and the output of the 4th comparator and the 5th comparator is connected to the input of integrating circuit jointly.
12. interchange as claimed in claim 7 is characterized in that to direct current transducer this AC synchronous signal detection circuit comprises a transformer, one the 4th comparator, an one shots and an add circuit, wherein:
The input of this transformer connects AC power;
The input of the 4th comparator connects the output of this transformer;
One input of this one shots connects the output of the 4th comparator;
The input of this add circuit connects the output of this one shots.
13. as claim 5 or 6 described interchanges to direct current transducer, it is characterized in that, this power breakdown circuit for detecting comprises an AC synchronous signal detection circuit, an integrating circuit and a comparison circuit, wherein: AC synchronous signal detection circuit comprises two optical couplers, the input of two optical couplers connects the two ends of AC power respectively, and the output of two optical couplers is connected to integrating circuit;
This integrating circuit is to be made of an electric capacity of being located on comparison circuit one input, and electric capacity one end is except that connecting the reference voltage source by one the 3rd resistance, and also the output with AC synchronous signal detection circuit is connected.
14。As claim 5 or 6 described interchanges to direct current transducer, it is characterized in that, this power breakdown circuit for detecting comprises an AC synchronous signal detection circuit, one integrating circuit and a comparison circuit, the input of this AC synchronous signal detection circuit connects AC power, the input of this integrating circuit connects the output of aforementioned AC synchronous signal detection circuit, this comparison circuit comprises a first transistor and a Zener diode, the base stage of this first transistor connects this Zener diode, and be connected with the integrating circuit output by this Zener diode, the collector electrode of the first transistor then is connected to this logic judging circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005101080409A CN100533937C (en) | 2005-09-29 | 2005-09-29 | DC-AC converter for inhibiting surge current dynamically |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005101080409A CN100533937C (en) | 2005-09-29 | 2005-09-29 | DC-AC converter for inhibiting surge current dynamically |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1941590A CN1941590A (en) | 2007-04-04 |
| CN100533937C true CN100533937C (en) | 2009-08-26 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2005101080409A Expired - Fee Related CN100533937C (en) | 2005-09-29 | 2005-09-29 | DC-AC converter for inhibiting surge current dynamically |
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| Country | Link |
|---|---|
| CN (1) | CN100533937C (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE112015000604B4 (en) * | 2015-03-19 | 2017-11-16 | Mitsubishi Electric Corporation | System of converter units and converter unit |
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2005
- 2005-09-29 CN CNB2005101080409A patent/CN100533937C/en not_active Expired - Fee Related
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| Publication number | Publication date |
|---|---|
| CN1941590A (en) | 2007-04-04 |
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