CN204442163U - The quick active leadage circuit of AC-DC driver output filter capacitor - Google Patents
The quick active leadage circuit of AC-DC driver output filter capacitor Download PDFInfo
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- CN204442163U CN204442163U CN201520208225.6U CN201520208225U CN204442163U CN 204442163 U CN204442163 U CN 204442163U CN 201520208225 U CN201520208225 U CN 201520208225U CN 204442163 U CN204442163 U CN 204442163U
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Abstract
The utility model discloses the quick active leadage circuit of a kind of AC-DC driver output filter capacitor, comprise output filter capacitor terminal voltage detecting circuit, interrupteur SW drive circuit, interrupteur SW and low resistance load resistance RL, when output filter capacitor terminal voltage detecting circuit perception AC-DC converter output filter capacitor terminal voltage is greater than the discharge voltage of setting, disconnected by interrupteur SW drive circuit force switch SW, weak current flows through low-resistance load RL; When output filter capacitor terminal voltage detecting circuit perception AC-DC converter output filter capacitor terminal voltage is less than setting discharge voltage, interrupteur SW drive circuit state turnover, force switch SW connects, and output filter capacitor is discharged rapidly by low-resistance load RL.The utility model velocity of discharge is fast, and after making power-off, delayed start circuit resets rapidly, and maximum discharge current is controlled, avoids interrupteur SW overcurrent damage phenomenon; Low in energy consumption, in normal state, leadage circuit overall power can be controlled in below 100mW.
Description
Technical field
The utility model relates to electronic technology field, relates to a kind of AC-DC driver, particularly relates to the quick active leadage circuit of a kind of AC-DC driver output filter capacitor.
Background technology
In AC-DC drive circuit, for making acquisition galvanic current pressure, in AC-DC converter primary side rectifier filter circuit, inevitably employ large bulk capacitance as low pressure output filter capacitor.When the connecting resistance load of AC-DC driver, after disconnecting civil power, the energy that output filter capacitor stores will be discharged by resistive load rapidly, output filter capacitor terminal voltage also declines immediately, make soft starting circuit reliable reset in AC-DC converter, ensure that instantaneous overvoltage phenomenon does not appear in powered on moment output again.But when AC-DC driver connects LED load, after disconnection civil power, output filter capacitor terminal voltage quickly falls to series LED chipset cut-in voltage
after, wherein n is the LED chip number of series connection,
for LED chip cut-in voltage, LED chip enters cut-off state, leakage current is very little, output capacitance discharge rate diminishes suddenly, tens seconds, even still there is very high residual voltage in output capacitance in tens seconds, the soft start capacitor in the soft starting circuit for preventing Switching Power Supply startup moment output overvoltage from arranging is caused to discharge, when powering on again in the short time after causing power-off, soft starting circuit lost efficacy, start converter output terminal instantaneously and occur instantaneous overvoltage, this may cause LED chip overcurrent damage.This phenomenon is even more serious in APFC single switch flyback formula LED drive circuit, reason is that the converter compensation loop response speed of band APFC function is very slow, in addition most APFC convertor controls chip does not have soft start controlling functions, can only rely on the soft starting circuit that could reset when output end voltage drops to very electronegative potential and realizes soft start function other the increasing of converter output voltage sample circuit.
For shortening after power-off output capacitance discharge time, conventional art connects dummy resistance at AC-DC converter output, but effect is very limited, and reason is that dummy resistance can not be too little, otherwise will the efficiency of power supply be had a strong impact on, and also can aggravate the temperature rise of driving power inside in addition.
Disclosing publication number in prior art is CN102594111A, patent name is the patent documentation of " a kind of quick discharging circuit ", and publication number is CN102869173A, patent name is the patent documentation of " a kind of LED drive electric power unit ", these two utility model patents all relate to output capacitance quick discharging circuit, but the reliability of the output capacitance quick discharging circuit adopted, practicality are not high.
Utility model content
For above-mentioned deficiency of the prior art, technical problem to be solved in the utility model is to provide a kind of AC-DC driver output filter capacitor quick active leadage circuit, this leadage circuit is directly parallel in the both positive and negative polarity of AC-DC converter output filter capacitor, under normal operating conditions, consumed power is less than 100mW, and after effectively solving the power-off of existing AC-DC driver, output filter capacitor discharges phenomenon slowly.
In order to solve the problems of the technologies described above, the utility model proposes the quick active leadage circuit of a kind of AC-DC driver output filter capacitor, comprise output filter capacitor terminal voltage detecting circuit, interrupteur SW drive circuit, interrupteur SW and low resistance load resistance RL, when output filter capacitor terminal voltage detecting circuit perception AC-DC converter output filter capacitor terminal voltage is greater than the discharge voltage of setting, disconnected by interrupteur SW drive circuit force switch SW, only have fine leak electric current to flow through low-resistance load RL; When output filter capacitor terminal voltage detecting circuit perception AC-DC converter output filter capacitor terminal voltage is less than setting discharge voltage, interrupteur SW drive circuit state turnover, force switch SW connects, and output filter capacitor is discharged rapidly by low-resistance load RL;
This quick active leadage circuit anode VCC connects the positive pole of AC-DC converter output filter capacitor, and quick active leadage circuit negative terminal GND connects the negative pole of AC-DC converter output filter capacitor; Described low-resistance load resistance RL connects with interrupteur SW, and load resistance RL one end connects quick active leadage circuit anode VCC, other end connecting valve SW, and the interrupteur SW other end connects quick active leadage circuit negative terminal GND; The anode of described output filter capacitor terminal voltage detecting circuit and interrupteur SW drive circuit all meets quick active leadage circuit anode VCC, and negative terminal all meets quick active leadage circuit negative terminal GND.
In implementing of the present utility model one, described output filter capacitor terminal voltage detecting circuit is made up of current-limiting resistance R1, voltage stabilizing didoe D1 and bleeder resistance R2, wherein current-limiting resistance R1 and voltage stabilizing didoe D1 connects, current-limiting resistance R1 one end connects active leadage circuit anode VCC, and the other end connects the negative electrode of voltage stabilizing didoe D1; Described interrupteur SW drive circuit is made up of NPN type triode Q1 and collector load resistor R3, the base stage of NPN type triode Q1 in the anode connecting valve SW drive circuit of voltage stabilizing didoe D1; Bleeder resistance R2 is connected in parallel between the ground level of NPN type triode Q1 and emitter, and collector load resistor R3 one end connects quick active leadage circuit anode VCC, and the other end connects the collector electrode of NPN type triode Q1; The emitter of NPN type triode Q1 meets quick active leadage circuit negative terminal GND; Described interrupteur SW is NPN triode Q2, and the base stage of NPN triode Q2 connects the collector electrode of NPN type triode Q1, and the collector electrode of NPN triode Q2 is connected with load resistance RL one end, and the emitter of NPN triode Q2 connects quick active leadage circuit negative terminal GND.
Further, described voltage stabilizing didoe D1 is voltage stabilizing didoe D11, D12 of two series aiding connections.
In an embodiment of the present utility model, described interrupteur SW is the multiple tube of the high current amplification factor that two NPN type triode Q21, Q22 are formed, the collector electrode of NPN type triode Q21, Q22 also connects together, and be connected to one end of load resistance RL, the emitter of NPN type triode Q21 connects the base stage of NPN type triode Q22, and introduce feedback resistance R4, the emitter of NPN type triode Q1 and NPN type triode Q22 is connected in parallel, and connecting one end of feedback resistance R4, the feedback resistance R4 other end connects quick active leadage circuit negative terminal GND; In interrupteur SW, introduce resistance R5, one end of resistance R5 connects the emitter of described NPN type triode Q21 and the base stage of NPN type triode Q22, and the other end connects the emitter of described NPN type triode Q1 and the emitter of NPN type triode Q22.
Further, described interrupteur SW is N channel power MOS pipe T2, and at the grid G of a N channel power MOS pipe T2 voltage stabilizing didoe D3 in parallel with between source S.
Further, feedback resistance R4 is introduced between interrupteur SW and quick active leadage circuit negative terminal GND, one end of feedback resistance R4 connects the anode of described voltage stabilizing didoe D3 and the source S of N channel power MOS pipe T2, and the other end of feedback resistance R4 connects quick active leadage circuit negative terminal GND.
In another embodiment of the present utility model, described output filter capacitor terminal voltage detecting circuit is made up of resitstance voltage divider, interrupteur SW drive circuit is made up of reference voltage source U1 and current-limiting resistance R31, interrupteur SW is made up of N channel power MOS pipe T3, wherein said resitstance voltage divider is in series by the first sample resistance R11 and the second sample resistance R21, first sample resistance R11 one end connects the anode VCC of quick active leadage circuit, second sample resistance R21 one end connects and connects quick active leadage circuit negative terminal GND, first sample resistance R11, the second sample resistance R21 other end connects together, and receive the reference potential input R of reference voltage source U1, the negative electrode K of reference voltage source U1 connects the grid G of N channel power MOS pipe T3, and the anode A of reference voltage source U1 connects quick active leadage circuit negative terminal GND, one end of current-limiting resistance R31 connects quick active leadage circuit anode VCC, and the other end connects the negative electrode K of reference voltage source U1.
Further, at the grid G of a described N channel power MOS pipe T3 voltage stabilizing didoe D21 in parallel with between source S.
Preferably, between the negative electrode K and N channel power MOS pipe T3 of described reference voltage source U1, the level shift circuit be made up of voltage stabilizing didoe D22 and current-limiting resistance R41 is inserted; The negative electrode of described voltage stabilizing didoe D22 connects the negative electrode K of reference voltage source U1, and the anode of voltage stabilizing didoe D22 connects the grid G of N channel power MOS pipe T3; One end of current-limiting resistance R41 connects the grid G of N channel power MOS pipe T3, and the other end connects quick active leadage circuit negative terminal GND.
Preferably, the level shift circuit be made up of 3 diodes D31, D32, D33 and current-limiting resistance R51 is inserted between the negative electrode K and N channel power MOS pipe T3 of described reference voltage source U1, the negative electrode of described diode D31 connects the negative electrode K of reference voltage source U1, and the anode of diode D31 connects the grid G of N channel power MOS pipe T3; Diode D32, D33 series aiding connection, anode connects the negative electrode K of reference voltage source U1, and negative electrode connects the grid G of N channel power MOS pipe T3; Current-limiting resistance R51 one end connects the grid G of N channel power MOS pipe T3, and the other end connects quick active leadage circuit negative terminal GND.
The operation principle of the quick active leadage circuit of AC-DC driver output filter capacitor of the present utility model: in normal state, when the terminal voltage of output filter capacitor terminal voltage detecting circuit perception AC-DC converter output filter capacitor is greater than the discharge voltage of setting, force switch SW disconnects, only have fine leak electric current to flow through low-resistance load RL, and output filter capacitor terminal voltage detecting circuit, interrupteur SW control circuit consumed power are very little; And after powered on moment or power-off, when output filter capacitor terminal voltage detecting circuit finds that the terminal voltage of AC-DC converter output filter capacitor is less than setting discharge voltage, interrupteur SW drive circuit state turnover, force switch SW connects, and output filter capacitor can be discharged rapidly by low-resistance load RL.Visible, the effect of the leadage circuit that the utility model provides is contrary with voltage stabilizing didoe characteristic: when terminal voltage is higher than set point, leadage circuit presents high-impedance state, and electric current is very little; Otherwise after terminal voltage is less than set point, leadage circuit is in low resistive state, conducting resistance is close to load resistance RL.After power-off, maximum discharge current is relevant with output filter capacitor incipient discharge voltage and low-resistance load RL instantaneously, makes interrupteur SW maximum current controlled, prevents interrupteur SW overcurrent damage.
Implement the utility model, there is following beneficial effect:
(1) velocity of discharge is fast, in the reasonable situation of Selecting parameter, can in 0.5 second, and make output filter capacitor terminal voltage drop to less than 10%, after making power-off, delayed start circuit resets rapidly; Maximum discharge current is controlled, avoids interrupteur SW overcurrent damage phenomenon; Low in energy consumption, in normal state, leadage circuit overall power can be controlled in below 100mW.
(2) strong adaptability, can be used in various forms AC-DC converter, LED light device AC-DC driver not only can be avoided to start moment overvoltage phenomenon, in AC-DC converter debugging, maintenance process, also ohmic load need not be used to discharge to output capacitance, facilitate debugging and the maintenance of Switching Power Supply.
(3) with low cost, reliability is high, need not debug.
Accompanying drawing explanation
Fig. 1 is the functional-block diagram of the quick active leadage circuit of AC-DC driver output filter capacitor that the utility model provides.
Fig. 2 is the circuit block diagram of the quick active leadage circuit of AC-DC driver output filter capacitor that the utility model embodiment one provides.
Fig. 3 is the circuit block diagram of the quick active leadage circuit of AC-DC driver output filter capacitor that the utility model embodiment two provides.
Fig. 4 is the circuit block diagram of the quick active leadage circuit of AC-DC driver output filter capacitor that the utility model embodiment three provides.
Fig. 5 is the circuit block diagram of the quick active leadage circuit of AC-DC driver output filter capacitor that the utility model embodiment four provides.
Fig. 6 is the circuit block diagram of the quick active leadage circuit of AC-DC driver output filter capacitor that the utility model embodiment five provides.
Fig. 7 is the circuit block diagram of the quick active leadage circuit of AC-DC driver output filter capacitor that the utility model embodiment six provides.
Fig. 8 is the circuit block diagram of the quick active leadage circuit of AC-DC driver output filter capacitor that the utility model embodiment seven provides.
Fig. 9 is the circuit block diagram of the quick active leadage circuit of AC-DC driver output filter capacitor that the utility model embodiment eight provides.
Embodiment
Below in conjunction with the accompanying drawing in the utility model embodiment, be clearly and completely described the technical scheme in the utility model embodiment, obviously, described embodiment is only the utility model part embodiment, instead of whole embodiments.Based on the embodiment in the utility model, those of ordinary skill in the art are not making the every other embodiment obtained under creative work prerequisite, all belong to the scope of the utility model protection.
Embodiment one
See Fig. 1, it is the functional-block diagram of the quick active leadage circuit of AC-DC driver output filter capacitor that the utility model provides.
The quick active leadage circuit of this AC-DC driver output filter capacitor comprises: output filter capacitor terminal voltage detecting circuit 10, interrupteur SW drive circuit 11, interrupteur SW 13 and low resistance load resistance RL12, this quick active leadage circuit anode VCC connects the positive pole of AC-DC converter output filter capacitor 2, quick active leadage circuit negative terminal GND connects the negative pole of AC-DC converter output filter capacitor 2, described low-resistance load resistance RL12 connects with interrupteur SW 13, load resistance R12L one end connects quick active leadage circuit anode VCC, other end connecting valve SW13, interrupteur SW 13 other end connects quick active leadage circuit negative terminal GND, described output filter capacitor terminal voltage detecting circuit 10 all meets quick active leadage circuit anode VCC with the anode of interrupteur SW drive circuit 12, and negative terminal all meets quick active leadage circuit negative terminal GND.
Wherein: the quick active leadage circuit of AC-DC driver output filter capacitor of the present utility model in normal state, when the terminal voltage of output filter capacitor terminal voltage detecting circuit 10 perception AC-DC converter output filter capacitor 2 is greater than the discharge voltage of setting, force switch SW13 disconnects, only have fine leak electric current to flow through low-resistance load RL12, and output filter capacitor terminal voltage detecting circuit 10, interrupteur SW control circuit 11 consumed power are very little; And after powered on moment or power-off, when the terminal voltage of output filter capacitor terminal voltage detecting circuit 10 perception AC-DC converter output filter capacitor 2 is less than setting discharge voltage, interrupteur SW drive circuit 11 state turnover, force switch SW13 connects, and AC-DC driver output filter capacitor 2 can be discharged rapidly by low-resistance load RL12.Visible, the effect of the leadage circuit that the utility model provides is contrary with voltage stabilizing didoe characteristic: when terminal voltage is higher than set point, leadage circuit presents high-impedance state, and electric current is very little; Otherwise after terminal voltage is less than set point, leadage circuit is in low resistive state, conducting resistance is close to load resistance RL12.After power-off, maximum discharge current is relevant with output filter capacitor 2 incipient discharge voltage and low-resistance load RL12 instantaneously, makes interrupteur SW 13 maximum current controlled, prevents interrupteur SW 13 overcurrent damage.
Concrete, as shown in Figure 2, output filter capacitor terminal voltage detecting circuit 10 of the present utility model is made up of current-limiting resistance R1, voltage stabilizing didoe D1 and bleeder resistance R2, wherein current-limiting resistance R1 and voltage stabilizing didoe D1 connects, current-limiting resistance R1 one end connects active leadage circuit anode VCC, and the other end connects the negative electrode of voltage stabilizing didoe D1; Described interrupteur SW drive circuit 11 is made up of NPN type triode Q1 and collector load resistor R3, the base stage of NPN type triode Q1 in the anode connecting valve SW drive circuit of voltage stabilizing didoe D1; Bleeder resistance R2 is connected in parallel between the ground level of NPN type triode Q1 and emitter, and collector load resistor R3 one end connects quick active leadage circuit anode VCC, and the other end connects the collector electrode of NPN type triode Q1; The emitter of NPN type triode Q1 connects quick active leadage circuit negative terminal GND; Described interrupteur SW is NPN triode Q2, and the base stage of NPN triode Q2 connects the collector electrode of NPN type triode Q1, and the collector electrode of NPN triode Q2 is connected with load resistance RL12 one end, and the emitter of NPN triode Q2 connects quick active leadage circuit negative terminal GND.
Wherein, the parameter of voltage stabilizing didoe D1 is determined by discharge voltage, such as, when the load of LED illumination AC-DC driver is 10 LED chip series connection, normal working voltage is between 29V ~ 34V, at this moment between the desirable 24V ~ 27V of discharge voltage, therefore optional 24V or 27V of voltage stabilizing didoe D1 burning voltage.When quick active leadage circuit anode VCC is less than the stable voltage of voltage stabilizing didoe D1, voltage stabilizing didoe D1 is in cut-off state, the voltage difference that leakage current produces at bleeder resistance R2 two ends is less than 0.5V, NPN type triode Q1 pipe ends, the collector electrode of NPN type triode Q1 exports high level, bear the NPN triode Q2 saturation conduction of interrupteur SW function, AC-DC converter output filter capacitor 2 is discharged by low-resistance load RL12, if NPN triode Q2 currentamplificationfactorβ is enough large, then the resistance of collector load resistor R3 just can be larger, to reduce the power consumption of active leadage circuit, otherwise, when VCC is greater than the stable voltage of voltage stabilizing didoe D1, voltage stabilizing didoe D1 conducting, be in reverse breakdown state, the terminal voltage of bleeder resistance R2 is greater than 0.5V, NPN type triode Q1 saturation conduction, the collector electrode output low level of NPN type triode Q1, NPN triode Q2 ends, if the resistance of collector load resistor R3 is larger, then NPN type triode Q1 saturation current just can be less than 1mA, and the resistance of current-limiting resistance R1 also can be comparatively large, with the power consumption of active leadage circuit under reducing normal operating conditions.
Embodiment two
For convenience of the selection of discharge voltage, in the enforcement two of the quick active leadage circuit of AC-DC driver output filter capacitor of the present utility model, as shown in Figure 3, use two series aiding connection voltage stabilizing didoes D11, D12 to form discharge voltage detecting element, replace with voltage stabilizing didoe D11, D12 of two series aiding connections by the voltage stabilizing didoe D1 in embodiment one.Other structure of enforcement two is identical with embodiment one, does not repeat them here.
Embodiment three
As shown in Figure 4, on the basis of embodiment two, consider that the currentamplificationfactorβ of single power NPN triode Q2 is limited, use NPN triode Q21, the multiple tube that Q22 forms high current amplification factor replaces single power NPN pipe Q2, as interrupteur SW 12, to improve the currentamplificationfactorβ of interrupteur SW, collector load resistor R3 can be improved further, the resistance of current-limiting resistance R1, the power consumption of the active leadage circuit of further reduction, wherein, NPN type triode Q21, the collector electrode of Q22 also connects together, and be connected to one end of load resistance RL12, the emitter of NPN type triode Q21 connects the base stage of NPN type triode Q22.In addition, resistance R5 is introduced in interrupteur SW 13, one end of resistance R5 connects the emitter of described NPN type triode Q21 and the base stage of NPN type triode Q22, the other end connects the emitter of described NPN type triode Q1 and the emitter of NPN type triode Q22, wherein resistance R5 provides path of releasing to NPN type triode Q21 thermal break-through electric current, and avoids NPN type triode Q22 to mislead.
For shortening NPN type triode Q1 by by the end of conducting or by the transit time being conducting to cut-off, positive feedback is introduced by feedback resistance R4, the emitter of NPN type triode Q1 and NPN type triode Q22 is connected in parallel, and connect one end of feedback resistance R4, the feedback resistance R4 other end connects quick active leadage circuit negative terminal GND, emitter and the NPN type triode Q21 bearing switching function of NPN type triode Q1, Q22 equivalence emitter connects together, the resistance size of feedback resistance R4 is generally about 2% of load resistance RL, such as when the resistance of load resistance RL gets 240 Ω, between desirable 3.3 Ω ~ 5.1 Ω of resistance of feedback resistance R4.Like this when VCC is less than voltage stabilizing didoe D11, D12 burning voltage sum, the ideal base drive current of NPN type triode Q1 reduces, the collector potential of NPN type triode Q1 raises, interrupteur SW conducting, the terminal voltage of feedback resistance R4 raises, and the emitter current potential of NPN type triode Q1 rises, the base stage of NPN type triode Q1 reduces partially, trigger strong positive feedback effect, make NPN type triode Q1 enter cut-off state rapidly, interrupteur SW enters conducting state rapidly.
Embodiment four
Further, as shown in Figure 5, on the basis of enforcement one, with the NPN type triode Q2 bearing switching function in N channel power MOS pipe T2 alternative embodiment one, so just, obtain the quick active leadage circuit shown in Fig. 5, wherein, the grid G of N channel power MOS pipe T2 connects the node between the collector electrode of NPN type triode Q1 and collector load resistor R3, and the source S of N channel power MOS pipe T2 connects quick active leadage circuit negative terminal GND.In addition, when VCC voltage is greater than the GS pole maximum breakdown voltage of N channel power MOS pipe T2, needs are the voltage stabilizing didoe D3 between 10V ~ 18V at the grid G of a N channel power MOS pipe T2 burning voltage in parallel with between source S, prevent the grid G excessive pressure damages of N channel power MOS pipe T2.
Embodiment five
On the basis of enforcement four, feedback resistance R4 is introduced between interrupteur SW 13 and quick active leadage circuit negative terminal GND, as shown in Figure 6, one end of feedback resistance R4 connects the anode of described voltage stabilizing didoe D3 and the source S of N channel power MOS pipe T2, the introducing that the other end of feedback resistance R4 connects quick active leadage circuit negative terminal GND, feedback resistance R4 shortens NPN type triode Q1 by by the end of conducting or by the transit time being conducting to cut-off.
Embodiment six
Further, in above-mentioned five embodiments, using voltage stabilizing didoe as output filter capacitor terminal voltage detecting element, there is certain dispersiveness in initial discharge voltage.For this reason, resitstance voltage divider is used to form output filter capacitor terminal voltage detecting element in the present embodiment six, and use reference voltage source U1 as the core parts of interrupteur SW drive circuit 11, use N channel power MOS pipe T3 as interrupteur SW, concrete, as shown in Figure 7, output filter capacitor terminal voltage detecting circuit 10 is made up of resitstance voltage divider, interrupteur SW drive circuit 11 is made up of reference voltage source U1 and current-limiting resistance R31, interrupteur SW 13 is made up of N channel power MOS pipe T3, wherein said resitstance voltage divider is in series by the first sample resistance R11 and the second sample resistance R21, first sample resistance R11 one end connects the anode VCC of quick active leadage circuit, second sample resistance R21 one end connects and connects quick active leadage circuit negative terminal GND, first sample resistance R11, the second sample resistance R21 other end connects together, and receive the reference potential input R of reference voltage source U1, the negative electrode K of reference voltage source U1 connects the grid G of N channel power MOS pipe T3, and the anode A of reference voltage source U1 connects quick active leadage circuit negative terminal GND, one end of current-limiting resistance R31 connects quick active leadage circuit anode VCC, and the other end connects the negative electrode K of reference voltage source U1.In addition, when VCC voltage is greater than the grid source electrode maximum breakdown voltage of N channel power MOS pipe T3, at the voltage stabilizing didoe D21 that the grid G of a N channel power MOS pipe T3 burning voltage in parallel with between source S is 15V, prevent the grid G excessive pressure damages of N channel power MOS pipe T3.
In this enforcement six, work as VCC
time, the negative electrode K of reference voltage source U1 exports high level, N channel power MOS pipe T3 conducting, and AC-DC converter output filter capacitor 2 is discharged by low-resistance load RL12, and terminal voltage is declined rapidly; Otherwise, work as VCC
time, the negative electrode K output low level of reference voltage source U1, N channel power MOS pipe T3 ends.Resistance due to current-limiting resistance R31, terminal voltage sample resistance R11, R21 can obtain comparatively large, and therefore in normal operation, leadage circuit consumed power is very little.
Embodiment seven
Consider that the negative electrode K minimum voltage of reference voltage source U1 is only 1.9V upper and lower, and the threshold voltage of most low withstand voltage N channel power MOS pipe
between 1.0V ~ 3.0V, may cause in normal operation, interrupteur SW is not thoroughly closed, and adds the power consumption of leadage circuit.For this reason, on the basis of embodiment six, increase level shift circuit 20, under guaranteeing normal operating conditions, interrupteur SW is reliably ended.
As shown in Figure 8, it is the circuit block diagram of the quick active leadage circuit of AC-DC driver output filter capacitor that the utility model embodiment seven provides, the level shift circuit 20 be made up of voltage stabilizing didoe D22 and current-limiting resistance R41 is inserted between the negative electrode K and N channel power MOS pipe T3 of described reference voltage source U1, voltage stabilizing didoe D22 is 2.4V or 2.7V voltage stabilizing didoe, the negative electrode of described voltage stabilizing didoe D22 connects the negative electrode K of reference voltage source U1, and the anode of voltage stabilizing didoe D22 connects the grid G of N channel power MOS pipe T3; One end of current-limiting resistance R41 connects the grid G of N channel power MOS pipe T3, and the other end connects quick active leadage circuit negative terminal GND.
Embodiment eight
As shown in Figure 9, it is the circuit block diagram of the quick active leadage circuit of AC-DC driver output filter capacitor that the utility model embodiment eight provides, from the difference of embodiment seven, embodiment eight is only that the formation of level shift circuit 20 is different, level shift circuit 20 in embodiment eight is made up of 3 diodes D31, D32, D33 and current-limiting resistance R51, the negative electrode of described diode D31 connects the negative electrode K of reference voltage source U1, and the anode of diode D31 connects the grid G of N channel power MOS pipe T3; Diode D32, D33 series aiding connection, anode connects the negative electrode K of reference voltage source U1, and negative electrode connects the grid G of N channel power MOS pipe T3; Current-limiting resistance R51 one end connects the grid G of N channel power MOS pipe T3, and the other end connects quick active leadage circuit negative terminal GND.
The quick active leadage circuit embodiment velocity of discharge of AC-DC driver output filter capacitor of the present utility model is fast, in the reasonable situation of Selecting parameter, can in 0.5 second, make the terminal voltage of output filter capacitor 2 drop to less than 10%, after making power-off, delayed start circuit resets rapidly; Maximum discharge current is controlled, avoids interrupteur SW overcurrent damage phenomenon; Low in energy consumption, in normal state, leadage circuit overall power can be controlled in below 100mW.The utility model strong adaptability, can be used in various forms AC-DC converter, LED light device AC-DC driver not only can be avoided to start moment overvoltage phenomenon, in AC-DC converter debugging, maintenance process, also ohmic load need not be used to discharge to output capacitance, facilitate debugging and the maintenance of Switching Power Supply.
The above is preferred implementation of the present utility model; it should be pointed out that for those skilled in the art, under the prerequisite not departing from the utility model principle; can also make some improvement and distortion, these improve and distortion is also considered as protection range of the present utility model.
Claims (10)
- The quick active leadage circuit of 1.AC-DC driver output filter capacitor, it is characterized in that, comprise output filter capacitor terminal voltage detecting circuit, interrupteur SW drive circuit, interrupteur SW and low resistance load resistance RL, when output filter capacitor terminal voltage detecting circuit perception AC-DC converter output filter capacitor terminal voltage is greater than the discharge voltage of setting, disconnected by interrupteur SW drive circuit force switch SW, only have fine leak electric current to flow through low-resistance load RL; When output filter capacitor terminal voltage detecting circuit perception AC-DC converter output filter capacitor terminal voltage is less than setting discharge voltage, interrupteur SW drive circuit state turnover, force switch SW connects, and output filter capacitor is discharged rapidly by low-resistance load RL;This quick active leadage circuit anode VCC connects the positive pole of AC-DC converter output filter capacitor, and quick active leadage circuit negative terminal GND connects the negative pole of AC-DC converter output filter capacitor; Described low-resistance load resistance RL connects with interrupteur SW, and low-resistance load resistance RL one end connects quick active leadage circuit anode VCC, other end connecting valve SW, and the interrupteur SW other end connects quick active leadage circuit negative terminal GND; The anode of described output filter capacitor terminal voltage detecting circuit and interrupteur SW drive circuit all meets quick active leadage circuit anode VCC, and negative terminal all meets quick active leadage circuit negative terminal GND.
- 2. the quick active leadage circuit of AC-DC driver output filter capacitor as claimed in claim 1, it is characterized in that, described output filter capacitor terminal voltage detecting circuit is made up of current-limiting resistance R1, voltage stabilizing didoe D1 and bleeder resistance R2, wherein current-limiting resistance R1 and voltage stabilizing didoe D1 connects, current-limiting resistance R1 one end connects active leadage circuit anode VCC, and the other end connects the negative electrode of voltage stabilizing didoe D1; Described interrupteur SW drive circuit is made up of NPN type triode Q1 and collector load resistor R3, the base stage of NPN type triode Q1 in the anode connecting valve SW drive circuit of voltage stabilizing didoe D1; Bleeder resistance R2 is connected in parallel between the ground level of NPN type triode Q1 and emitter, and collector load resistor R3 one end connects quick active leadage circuit anode VCC, and the other end connects the collector electrode of NPN type triode Q1; The emitter of NPN type triode Q1 meets quick active leadage circuit negative terminal GND; Described interrupteur SW is NPN triode Q2, and the base stage of NPN triode Q2 connects the collector electrode of NPN type triode Q1, and the collector electrode of NPN triode Q2 is connected with load resistance RL one end, and the emitter of NPN triode Q2 connects quick active leadage circuit negative terminal GND.
- 3. the quick active leadage circuit of AC-DC driver output filter capacitor as claimed in claim 2, it is characterized in that, described voltage stabilizing didoe D1 is voltage stabilizing didoe D11, D12 of two series aiding connections.
- 4. the quick active leadage circuit of AC-DC driver output filter capacitor as claimed in claim 2 or claim 3, it is characterized in that, described interrupteur SW is two NPN type triode Q21, the multiple tube of the high current amplification factor that Q22 is formed, NPN type triode Q21, the collector electrode of Q22 also connects together, and be connected to one end of load resistance RL, the emitter of NPN type triode Q21 connects the base stage of NPN type triode Q22, and introduce feedback resistance R4, the emitter of NPN type triode Q1 and NPN type triode Q22 is connected in parallel, and connect one end of feedback resistance R4, the feedback resistance R4 other end connects quick active leadage circuit negative terminal GND, in interrupteur SW, introduce resistance R5, one end of resistance R5 connects the emitter of described NPN type triode Q21 and the base stage of NPN type triode Q22, and the other end connects the emitter of described NPN type triode Q1 and the emitter of NPN type triode Q22.
- 5. the quick active leadage circuit of AC-DC driver output filter capacitor as claimed in claim 2, it is characterized in that, described interrupteur SW is N channel power MOS pipe T2, and at the grid G of a N channel power MOS pipe T2 voltage stabilizing didoe D3 in parallel with between source S.
- 6. the quick active leadage circuit of AC-DC driver output filter capacitor as claimed in claim 5, it is characterized in that, feedback resistance R4 is introduced between interrupteur SW and quick active leadage circuit negative terminal GND, one end of feedback resistance R4 connects the anode of described voltage stabilizing didoe D3 and the source S of N channel power MOS pipe T2, and the other end of feedback resistance R4 connects quick active leadage circuit negative terminal GND.
- 7. the quick active leadage circuit of AC-DC driver output filter capacitor as claimed in claim 1, it is characterized in that, described output filter capacitor terminal voltage detecting circuit is made up of resitstance voltage divider, interrupteur SW drive circuit is made up of reference voltage source U1 and current-limiting resistance R31, interrupteur SW is made up of N channel power MOS pipe T3, wherein said resitstance voltage divider is in series by the first sample resistance R11 and the second sample resistance R21, first sample resistance R11 one end connects the anode VCC of quick active leadage circuit, second sample resistance R21 one end connects and connects quick active leadage circuit negative terminal GND, first sample resistance R11, the second sample resistance R21 other end connects together, and receive the reference potential input R of reference voltage source U1, the negative electrode K of reference voltage source U1 connects the grid G of N channel power MOS pipe T3, and the anode A of reference voltage source U1 connects quick active leadage circuit negative terminal GND, one end of current-limiting resistance R31 connects quick active leadage circuit anode VCC, and the other end connects the negative electrode K of reference voltage source U1.
- 8. the quick active leadage circuit of AC-DC driver output filter capacitor as claimed in claim 7, is characterized in that, at the grid G of a described N channel power MOS pipe T3 voltage stabilizing didoe D21 in parallel with between source S.
- 9. the quick active leadage circuit of AC-DC driver output filter capacitor as claimed in claim 8, it is characterized in that, between the negative electrode K and N channel power MOS pipe T3 of described reference voltage source U1, insert the level shift circuit be made up of voltage stabilizing didoe D22 and current-limiting resistance R41; The negative electrode of described voltage stabilizing didoe D22 connects the negative electrode K of reference voltage source U1, and the anode of voltage stabilizing didoe D22 connects the grid G of N channel power MOS pipe T3; One end of current-limiting resistance R41 connects the grid G of N channel power MOS pipe T3, and the other end connects quick active leadage circuit negative terminal GND.
- 10. the quick active leadage circuit of AC-DC driver output filter capacitor as claimed in claim 8, it is characterized in that, the level shift circuit be made up of 3 diodes D31, D32, D33 and current-limiting resistance R51 is inserted between the negative electrode K and N channel power MOS pipe T3 of described reference voltage source U1, the negative electrode of described diode D31 connects the negative electrode K of reference voltage source U1, and the anode of diode D31 connects the grid G of N channel power MOS pipe T3; Diode D32, D33 series aiding connection, anode connects the negative electrode K of reference voltage source U1, and negative electrode connects the grid G of N channel power MOS pipe T3; Current-limiting resistance R51 one end connects the grid G of N channel power MOS pipe T3, and the other end connects quick active leadage circuit negative terminal GND.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201520208225.6U CN204442163U (en) | 2015-04-09 | 2015-04-09 | The quick active leadage circuit of AC-DC driver output filter capacitor |
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| CN201520208225.6U CN204442163U (en) | 2015-04-09 | 2015-04-09 | The quick active leadage circuit of AC-DC driver output filter capacitor |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104753326A (en) * | 2015-04-09 | 2015-07-01 | 广东工业大学 | AC-DC (alternating current-direct current) drive output filter capacitor quick active leakage circuit |
| CN105356736A (en) * | 2015-12-03 | 2016-02-24 | 中国航空工业集团公司洛阳电光设备研究所 | Laser power supply storage energy discharge system |
| CN111565485A (en) * | 2019-02-13 | 2020-08-21 | 益力半导体股份有限公司 | Intelligent dummy load electricity consumption system |
| CN112564471A (en) * | 2020-11-27 | 2021-03-26 | 国创新能源汽车智慧能源装备创新中心(江苏)有限公司 | Working sequence control circuit in two-stage conversion circuit and method thereof |
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2015
- 2015-04-09 CN CN201520208225.6U patent/CN204442163U/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104753326A (en) * | 2015-04-09 | 2015-07-01 | 广东工业大学 | AC-DC (alternating current-direct current) drive output filter capacitor quick active leakage circuit |
| CN105356736A (en) * | 2015-12-03 | 2016-02-24 | 中国航空工业集团公司洛阳电光设备研究所 | Laser power supply storage energy discharge system |
| CN105356736B (en) * | 2015-12-03 | 2018-02-13 | 中国航空工业集团公司洛阳电光设备研究所 | A kind of Laser Power Devices store energy bleed-off system |
| CN111565485A (en) * | 2019-02-13 | 2020-08-21 | 益力半导体股份有限公司 | Intelligent dummy load electricity consumption system |
| CN112564471A (en) * | 2020-11-27 | 2021-03-26 | 国创新能源汽车智慧能源装备创新中心(江苏)有限公司 | Working sequence control circuit in two-stage conversion circuit and method thereof |
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