CN202206307U - Gradual turn-off control circuit - Google Patents
Gradual turn-off control circuit Download PDFInfo
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- CN202206307U CN202206307U CN2011202460139U CN201120246013U CN202206307U CN 202206307 U CN202206307 U CN 202206307U CN 2011202460139 U CN2011202460139 U CN 2011202460139U CN 201120246013 U CN201120246013 U CN 201120246013U CN 202206307 U CN202206307 U CN 202206307U
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Abstract
A gradual turn-off control circuit is disclosed, which receives the voltage of a switching power supply to charge and discharge a capacitor circuit. The circuit includes: a first input node; an output node; the gradual shutdown control circuit further includes: a second input node receiving a high side voltage of the switching power supply; a charge-discharge path including a first switching part coupled between a first input node and an output node; a precharge controller coupled to a control terminal of the first switching part; a recharging path, including a second switch member, unidirectionally isolated from the charging and discharging path, coupled between the second input node and the output node; a charge pump controller coupled to a control terminal of the second switching component; and a discharge controller coupled to a control terminal of the first switching part. The circuit can enable the capacitor circuit to be charged to a higher voltage, so that fewer capacitors or capacitors with smaller capacitance values can be adopted, the size of the circuit is reduced, and the cost of the circuit is reduced.
Description
Technical field
The embodiment of the utility model relates to DC-DC converter, more specifically, relates to the closing control circuit gradually in the DC-DC converter.
Background technology
According to (the ITU of International Telecommunications Union; International Telecommunication Union) G991.2 agreement, ustomer premises access equipment (CPE, Customer Premises Equipment) is when outage; Need send signal to Digital Subscriber Line (DSL, Digital Subscriber Line).This signal is shutdown signal (dying gasp) gradually.Fig. 1 shows CPE is connected to the internet through DSLAM sketch map.Computer is connected to the DSL modulator-demodulator, and this DSL modulator-demodulator is connected to the internet through DSLAM (Digital Subscriber Line access modulator-demodulator).
Yet when CPE cut off the power supply fully, it can't send shutdown signal gradually to DSLAM.At this moment, CPE must obtain electric energy from other energy, to send shutdown signal gradually.Traditionally, the said energy is realized by the condenser network of the super capacitor that comprises a super capacitor or a plurality of parallel connections.When the CPE operate as normal, input voltage V
INThrough closing control circuit gradually condenser network is charged.And when CPE cut off the power supply, condenser network provided electric energy, so that input voltage V
INKeep certain hour.Simultaneously, CPE sends shutdown signal gradually to DSLAM.
Particularly, when operate as normal, input voltage V
INBe the power supply of CPE operating circuit, and condenser network charged to the first charging voltage V through closing control circuit gradually
1When CPE cuts off the power supply, input voltage V
INReduce gradually.As input voltage V
INBe decreased to set point V
PREThe time, ultracapacitor through closing control circuit gradually to input capacitance C
INPower supply is so that input voltage V
INIn a period of time, be maintained set point V
PRESimultaneously, CPE obtains electric energy from ultracapacitor, sends shutdown signal gradually to DSL.
For sending shutdown signal gradually, condenser network need be stored enough electric energy.Therefore, in practical application, simultaneously with several super capacitor parallel connections, perhaps adopt a super capacitor usually with high appearance value.The required energy of shutdown signal is E ' if send gradually, and it depends on user's demand, and can be expressed as suc as formula shown in (1):
E′＝Pt (1)
Wherein, P is the power of user's request, and t is that input voltage is held time.
The energy E of establishing each super capacitor again and being discharged can be expressed as suc as formula shown in (2):
Wherein, C is the appearance value of ultracapacitor.
Typically, the value of P and t is got 3W and 50ms respectively, and input voltage V
INWith setting voltage V
PREGet 5V and 3.8V respectively.Then can be known by formula (1) and (2), be the ultracapacitor of 30000uF for appearance value common on the market, needs this ultracapacitor to send shutdown signal gradually to store enough electric energy; And be the ultracapacitor of 10000uF for the appearance value, then need 3 these ultracapacitors send shutdown signal gradually to store enough electric energy.
Particularly, be the ultracapacitor of 30000uF for the appearance value, the electric energy that each this ultracapacitor provided is suc as formula shown in (3):
For the appearance value is the ultracapacitor of 10000uF, and the electric energy that each this ultracapacitor provided is suc as formula shown in (4):
Send gradually the required energy of shutdown signal and be E ' suc as formula shown in (5):
E′＝Pt＝3×0.05＝0.15W (5)
Can know that by formula (3)～(5) ultracapacitor that the ultracapacitor that appearance value is 30000uF or three appearance values are 10000uF all can provide enough electric energy to send shutdown signal gradually.
Yet the appearance value is the ultracapacitor bulky of 30000uF, expensive; The appearance value be the ultracapacitor of 10000uF then owing to need to adopt three to satisfy the demands, will make complicated circuit, cost increases.
The utility model content
A purpose of the utility model is to provide a kind of circuit size and closing control circuit gradually that reduces circuit cost of reducing.
Aspect of the utility model, a kind of closing control circuit gradually is provided, the receiving key power source voltage is charged to condenser network and is discharged, and said closing control circuit gradually comprises: the first input node; Output node; Said closing control circuit gradually also comprises: the second input node, the high side voltage of receiving key power supply; Discharge and recharge path, comprise first switch block, be coupled between said first input node and the said output node; The precharge controller is coupled to the control end of said first switch block; Recharge path, comprise the second switch parts, and discharge and recharge the unidirectional isolation of path, be coupled between said second input node and the said output node; Charge pump controller is coupled to the control end of said second switch parts; And discharge controller, be coupled to the control end of first switch block.
According to the embodiment of the utility model, said first switch block comprises: the first transistor, the first terminal of said the first transistor are connected to the said first input node; Transistor seconds, the first terminal of said transistor seconds are connected to second terminal of said the first transistor, and its second terminal is connected to said output node, and its control end is connected to the control end of said the first transistor.
According to the embodiment of the utility model, said precharge controller comprises first current-limiting circuit, and said first current-limiting circuit is coupled to the control end of said first input node and said the first transistor.
According to the embodiment of the utility model, said first current-limiting circuit comprises: first resistance, the first terminal of said first resistance are coupled to the said first input node; The 3rd transistor, the said the 3rd transistorized the first terminal is coupled to second terminal of said first resistance, and its control end is connected to the control end of said the first transistor; First operational amplifier, the in-phase input end of said first operational amplifier is connected to the first terminal of said first resistance, and its inverting input is connected to second terminal of said first resistance; The 5th transistor; The said the 5th transistorized control end is coupled to the output of said first operational amplifier; And its first terminal is connected to ground, and the control end of the wherein said the 5th transistorized second terminal and said the first transistor is connected to the output of a current source.
According to the embodiment of the utility model, the said path that recharges also comprises: first diode, the anode of said first diode are coupled to the said second input node, and negative electrode is coupled to the first terminal of second switch parts; Second diode, the anode of said second diode are coupled to the said first input node, and negative electrode is coupled to the anode and the second input node of first diode; Be coupled to the negative electrode of said first diode with the first terminal of said second switch parts, and its second terminal is coupled to said output node.
Embodiment according to the utility model; Said charge pump controller comprises first comparator; The in-phase input end of said first comparator is coupled to said output node, and its inverting input receives first reference voltage, and its output is connected to the control end of said second switch parts.
According to the embodiment of the utility model, said switch is a mos field effect transistor.
According to the embodiment of the utility model, said discharge controller comprises: second current-limiting circuit, and said second current-limiting circuit is coupled to the control end of said output node and said transistor seconds; With the voltage interruption testing circuit, said voltage interruption testing circuit is coupled to the said first input node and the said first and second transistorized control ends.
According to the embodiment of the utility model, said second current-limiting circuit comprises: second resistance, and the first terminal of said second resistance is coupled to said output node; The 4th transistor, the said the 4th transistorized the first terminal is coupled to second terminal of said second resistance, and its control end is connected to the control end of said transistor seconds; Second operational amplifier, the in-phase input end of said second operational amplifier is connected to the first terminal of said second resistance, and its inverting input is connected to second terminal of said second resistance; With the 6th transistor, the said the 6th transistorized control end is coupled to the output of said second operational amplifier, and its first terminal is connected to ground, and its second terminal is coupled to the output of a current source.
According to the embodiment of the utility model, said voltage interruption testing circuit comprises: the 3rd operational amplifier, the in-phase input end of said the 3rd operational amplifier are coupled to the said first input node, and its inverting input receives second reference voltage; With the 7th transistor, the said the 7th transistorized first end is coupled to the said first and second transistorized control ends, and its second terminal is connected to ground, and its control end is coupled to the output of said the 3rd operational amplifier.
Another embodiment according to the utility model provides a kind of charge-discharge circuit, comprising: aforesaid closing control circuit gradually; And condenser network, said condenser network is connected between output node and the ground.
According to the embodiment of the utility model, said condenser network comprises an electric capacity or a plurality of electric capacity that is connected in parallel.
According to the embodiment of the utility model, said closing control circuit gradually also comprises: first feedback loop, said first feedback loop are connected between the first input node and the discharge controller; With second feedback loop, said second feedback loop is connected in output node and recharges between the controller.
According to the closing control circuit gradually of the utility model, make condenser network can charge to higher voltage, thereby can adopt electric capacity still less or adopt the littler electric capacity of capacitance, thereby make circuit size reduce that circuit cost reduces.
Description of drawings
Fig. 1 shows CPE is connected to the internet through DSLAM sketch map;
Fig. 2 shows the application drawing according to the closing control circuit gradually of an embodiment of the utility model;
Fig. 3 shows the structural representation according to the circuit of an embodiment of the utility model;
Fig. 4 shows the exemplary waveforms figure of circuit as shown in Figure 3 each interdependent node in charging process;
Fig. 5 shows the exemplary waveforms figure of circuit as shown in Figure 3 each interdependent node in discharge process;
Fig. 6 illustrates the structural representation according to the closing control circuit gradually of an embodiment of the utility model.
Embodiment
Below will the present invention be described in more detail with reference to accompanying drawing.In each accompanying drawing, components identical adopts similar Reference numeral to represent.For the sake of clarity, the various piece in the accompanying drawing is not drawn in proportion.
Specify the closing control circuit gradually of the utility model embodiment below.In ensuing explanation, some concrete details, for example the transistor types among the embodiment all is used for to embodiments of the invention better understanding being provided.Even the technical staff in present technique field is appreciated that embodiments of the invention also can be implemented under the situation that lacks combinations such as some details or additive method, material.
Fig. 2 shows the structural representation according to the circuit of an embodiment of the utility model.As shown in Figure 2; The frame of broken lines on top shows an embodiment of closing control circuit gradually; The frame of broken lines of bottom shows an embodiment of DC-DC power circuit, and wherein control circuit MP28251 can obtain from core origin system Co., Ltd, perhaps adopts other DC/DC power circuit.
Fig. 3 shows the structural representation according to the closing control circuit gradually of an embodiment of the utility model.As shown in Figure 3, BST end and VIN end receive its high side voltage and input voltage from the DC-DC power supply respectively, and wherein the peak value of the high side voltage of DC-DC power supply is the twice of its input voltage.STRG end external capacitor circuit.The precharge controller is couple to the control end of VIN end and switch block Q2.In course of normal operation, precharge controller control switch parts Q2 conducting uses the voltage from VIN end that condenser network is charged, and the voltage at condenser network two ends is charged to the first charging voltage V
1, this first charging voltage V
1Can be V
INThe negative electrode of diode D2 is coupled in the BST end, and anode is coupled in the VIN end.The negative electrode of diode D1 is coupled in the end of transistor Q1, and anode is coupled in the BST end.The other end of transistor Q1 is couple to the STRG end, and then is couple to condenser network.
Charge pump controller is couple to an output of logic controller, and the control end of transistor Q1.Logic controller receives the feedback signal from the second feedback end FB2; To detect the charging voltage of condenser network; Thereby control charge pump controller oxide-semiconductor control transistors Q1 conducting; Use the voltage from the BST end that condenser network is charged, further the voltage with the condenser network two ends is charged to the second charging voltage V
2, as shown in Figure 5.In one embodiment, this target voltage is approximately the twice that VIN rectifies voltage when often working.
Discharge controller is coupled to an output of logic controller.Logic controller receives the feedback signal from the first feedback end FB1, is reduced to for example V of predetermined voltage when detecting VIN
PREThe time, the control discharge controller remains on above-mentioned predetermined voltage with the electric charge in the condenser network with the voltage of VIN with control switch parts Q2 conducting.Like this; Be charged to the crest voltage of DC-DC supply voltage through voltage with condenser network; And in the condenser network discharge process, its discharging current is controlled; After making that even CPE cuts off the power supply fully, also can the voltage of VIN end be remained on a period of time on the predetermined voltage, as shown in Figure 5.Simultaneously, CPE sends shutdown signal gradually to DSLAM.
When VIN end place has normal input voltage V
INThe time, closing control circuit gradually shown in Figure 3 is the condenser network charging through precharge controller and switch block Q2, to the first charging voltage V
1In certain embodiments, the first charging voltage V
1Equal input voltage V
INWhen condenser network charges to the first charging voltage V
1The time, closing control circuit is that condenser network charges once more through charge pump controller gradually, to the second charging voltage V
2In certain embodiments, the second charging voltage V
2Equal 2V
INAs input voltage V
INBe decreased to predeterminated voltage V
PREThe time, when the CPE powering-off state promptly took place, closing control circuit provided the end to VIN through discharge controller with electric energy stored in the condenser network gradually, so that the input voltage V at VIN end place
INMaintain predeterminated voltage V within a certain period of time
PRESimultaneously, closing control circuit sends shutdown signal gradually to DSL gradually.
To the condenser network recharging, so that compare with traditional closing control circuit gradually, condenser network has higher charging voltage to closing control circuit gradually shown in Figure 3 through control electrical appliances for electric charge pump.Therefore, the closing control circuit gradually that utilizes the utility model to propose, condenser network are stored the required electric capacity of identical energy still less.Thereby make circuit size reduce, circuit cost reduces.
Fig. 6 illustrates the closing control circuit gradually according to an embodiment of the utility model.As shown in Figure 6, closing control circuit comprises precharge controller and charge-discharge circuit gradually, and wherein said precharge controller comprises first current-limiting circuit; Said charge-discharge circuit comprises the first transistor M1 and transistor seconds M2, and it is corresponding to the switch block Q2 among Fig. 3.
As shown in Figure 6, the first terminal of the first transistor M1 is coupled to the VIN end; The first terminal of transistor seconds M2 is connected to second terminal of the first transistor M1, and its second terminal is coupled to the STRG end, and its control end is coupled to the control end of the first transistor M1.First current-limiting circuit is connected to the control end of VIN end and the first transistor M1.
More specifically, in the embodiment shown in fig. 6, said first current-limiting circuit comprises the 3rd transistor M3, first resistance R 1, the first operational amplifier OP1 and the 5th transistor M5.Wherein, the first terminal of first resistance R 1 is coupled to the VIN end; The first terminal of the 3rd transistor M3 is coupled to second terminal of first resistance R 1, and its control end is connected in the control end of the first transistor M1.The in-phase input end of the first operational amplifier OP1 is connected to the first terminal of resistance R 1, and its inverting input is connected in second terminal of resistance R 1; The control end of the 5th transistor M5 is connected to the output of the first operational amplifier OP1, and its first terminal is connected to ground, and its second terminal is coupled to current source I
DOutput.When VIN end place has normal input voltage V
INThe time, input voltage V
INRealize charging through the first transistor M1 and transistor seconds M2, until the first charging voltage V to condenser network 104
1Simultaneously, the electric current of first current-limiting circuit through flowing through on the detection the first transistor M1, thus it is controlled.
As shown in Figure 6, closing control circuit comprises and recharges path and charge pump controller gradually.Recharge path and comprise the first diode D1, second diode D2 and the K switch.The anode of the first diode D1 is coupled to the VIN end; Capacitor C
BThe first terminal be coupled to transducer, its second terminal is coupled to the negative electrode of the first diode D1, and it provides high side voltage; The anode of the second diode D2 is coupled to negative electrode and the capacitor C of the first diode D1
BSecond terminal.The first terminal of K switch is coupled to the negative electrode of the second diode D2, and its second terminal is coupled to the STRG end.Charge pump controller comprises comparator C OMP.The in-phase input end of comparator C OMP is coupled to the STRG end, and its inverting input receives the first reference voltage V
REF1, and its output is connected to the control end of K switch.
As shown in Figure 6, capacitor C
BThe first terminal be connected to transducer, the switching signal SW of receiving converter output.When switching signal SW is low level, input voltage V
INThrough the first diode D1 is capacitor C
BCharging, capacitor C
BBe recharged to voltage V
INWhen switching signal SW is high level, capacitor C
BBe recharged to 2V
IN, capacitor C
BHigh side voltage is provided.Therefore, after condenser network was through the charging of precharge controller, the STRG terminal voltage increased, when comparator C OMP detects the STRG terminal voltage greater than the first reference voltage V
REF1The time, comparator C OMP exports high level, thus control switch K conducting.At this moment, capacitor C
BTo charge once more to condenser network, up to the second charging voltage V
2Wherein, the first reference voltage V
REF1Equal the second charging voltage V
2
In certain embodiments, above-mentioned K switch is a mos field effect transistor.
As shown in Figure 6, closing control circuit comprises discharge controller gradually, and wherein, said discharge controller comprises second current-limiting circuit and voltage interruption testing circuit.Second current-limiting circuit is connected to the control end of STRG end and the first transistor M1 and transistor seconds M2.Said voltage interruption testing circuit is coupled to the control end of said VIN end and said the first transistor M1.More specifically, said second current-limiting circuit comprises the 4th transistor M4, second resistance R 2, the second operational amplifier OP2, the 6th transistor M6 and above-mentioned current source I
DThe first terminal of second resistance R 2 is coupled to the STRG end; The first terminal of the 4th transistor M4 is coupled to second terminal of second resistance R 2, and its control end is connected in the control end of transistor seconds M2; The in-phase input end of the second operational amplifier OP2 is connected to the first terminal of resistance R 2, and its inverting input is connected in second terminal of resistance R 2; The control end of the 6th transistor M6 is connected to the output of the second operational amplifier OP2, and its first terminal is connected to ground, and its second terminal is coupled to current source I
DOutput.Said voltage interruption testing circuit comprises the 3rd operational amplifier OP3 and the 7th transistor M7.The in-phase input end of the 3rd operational amplifier OP3 is coupled to said VIN end, and its inverting input receives the second reference voltage V
REF2The first terminal of said the 7th transistor M7 is coupled to the output of said current source, and its second terminal is connected to ground, and its control end is connected to the output of the 3rd operational amplifier OP3.
As input voltage V
INBe decreased to predeterminated voltage V
PREThe time, when the CPE powering-off state promptly took place, the 3rd operational amplifier OP3 control the first transistor M1 and transistor seconds M2 made condenser network discharge, so that input voltage V
INKeep the regular hour.Simultaneously, closing control circuit sends shutdown signal gradually to DSL gradually.Simultaneously, the electric current of second current-limiting circuit through flowing through on the detection transistor seconds M2, thus it is controlled.Wherein, the second reference voltage V
REF2Equal predeterminated voltage V
PRE
As shown in Figure 6, in certain embodiments, closing control circuit also comprises the first feedback loop F1 and the second feedback loop F2 gradually.Wherein, the said first feedback loop F1 is connected between said VIN end and the said discharge circuit; The second feedback loop F2 is connected between said STRG end and the said recharging circuit.
Can know that by Fig. 6 because condenser network is recharged the magnitude of voltage that is higher than input voltage VIN in, therefore, compare with traditional ultracapacitor, condenser network possibly utilize ultracapacitor still less, just can provide energy to send shutdown signal gradually.Therefore, utilize the circuit size of shut-off circuit gradually of the utility model littler, circuit cost reduces.
Specification of the invention described above and execution mode only are illustrated LDMOS device of the embodiment of the invention and preparation method thereof in an exemplary fashion, and are not used in the scope of the present invention that limits.It all is possible changing and revise for disclosed embodiment, other feasible selection property embodiment and can be understood by those skilled in the art the equivalent variations of element among the embodiment.Other variations of disclosed embodiment of this invention and modification do not exceed spirit of the present invention and protection range.
Claims (13)
1. closing control circuit gradually, the receiving key power source voltage is charged to condenser network and is discharged, and it is characterized in that, and said closing control circuit gradually comprises:
The first input node;
Output node;
It is characterized in that said closing control circuit gradually also comprises:
The second input node, the high side voltage of receiving key power supply;
Discharge and recharge path, comprise first switch block, be coupled between said first input node and the said output node;
The precharge controller is coupled to the control end of said first switch block;
Recharge path, comprise the second switch parts, and discharge and recharge the unidirectional isolation of path, be coupled between said second input node and the said output node;
Charge pump controller is coupled to the control end of said second switch parts; With
Discharge controller is coupled to the control end of first switch block.
2. closing control circuit gradually as claimed in claim 1 is characterized in that, said first switch block comprises:
The first transistor, the first terminal of said the first transistor are connected to the said first input node;
Transistor seconds, the first terminal of said transistor seconds are connected to second terminal of said the first transistor, and its second terminal is connected to said output node, and its control end is connected to the control end of said the first transistor.
3. closing control circuit gradually as claimed in claim 2 is characterized in that, said precharge controller comprises first current-limiting circuit, and said first current-limiting circuit is coupled to the control end of said first input node and said the first transistor.
4. closing control circuit gradually as claimed in claim 3 is characterized in that, said first current-limiting circuit comprises:
First resistance, the first terminal of said first resistance are coupled to the said first input node;
The 3rd transistor, the said the 3rd transistorized the first terminal is coupled to second terminal of said first resistance, and its control end is connected to the control end of said the first transistor;
First operational amplifier, the in-phase input end of said first operational amplifier is connected to the first terminal of said first resistance, and its inverting input is connected to second terminal of said first resistance;
The 5th transistor; The said the 5th transistorized control end is coupled to the output of said first operational amplifier; And its first terminal is connected to ground, and the control end of the wherein said the 5th transistorized second terminal and said the first transistor is connected to the output of a current source.
5. ON-OFF control circuit gradually as claimed in claim 1 is characterized in that, the said path that recharges also comprises:
First diode, the anode of said first diode are coupled to the said second input node, and negative electrode is coupled to the first terminal of second switch parts; With
Second diode, the anode of said second diode are coupled to the said first input node, and negative electrode is coupled to the anode and the second input node of first diode;
The first terminal of said second switch parts is coupled to the negative electrode of said first diode, and its second terminal is coupled to said output node.
6. closing control circuit gradually as claimed in claim 1; It is characterized in that; Said charge pump controller comprises first comparator; The in-phase input end of said first comparator is coupled to said output node, and its inverting input receives first reference voltage, and its output is connected to the control end of said second switch parts.
7. closing control circuit gradually as claimed in claim 5 is characterized in that, said switch is a mos field effect transistor.
8. closing control circuit gradually as claimed in claim 2 is characterized in that, said discharge controller comprises:
Second current-limiting circuit, said second current-limiting circuit is coupled to the control end of said output node and said transistor seconds; With
Voltage interruption testing circuit, said voltage interruption testing circuit are coupled to the said first input node and the said first and second transistorized control ends.
9. closing control circuit gradually as claimed in claim 8 is characterized in that, said second current-limiting circuit comprises:
Second resistance, the first terminal of said second resistance is coupled to said output node;
The 4th transistor, the said the 4th transistorized the first terminal is coupled to second terminal of said second resistance, and its control end is connected to the control end of said transistor seconds;
Second operational amplifier, the in-phase input end of said second operational amplifier is connected to the first terminal of said second resistance, and its inverting input is connected to second terminal of said second resistance; With
The 6th transistor, the said the 6th transistorized control end is coupled to the output of said second operational amplifier, and its first terminal is connected to ground, and its second terminal is coupled to the output of a current source.
10. closing control circuit gradually as claimed in claim 8 is characterized in that, said voltage interruption testing circuit comprises:
The 3rd operational amplifier, the in-phase input end of said the 3rd operational amplifier are coupled to the said first input node, and its inverting input receives second reference voltage; With
The 7th transistor, the said the 7th transistorized first end is coupled to the said first and second transistorized control ends, and its second terminal is connected to ground, and its control end is coupled to the output of said the 3rd operational amplifier.
11. a charge-discharge circuit is characterized in that, comprising:
Closing control circuit gradually as claimed in claim 1; With
Condenser network, said condenser network is connected between output node and the ground.
12. charge-discharge circuit as claimed in claim 11 is characterized in that, said condenser network comprises an electric capacity or a plurality of electric capacity that is connected in parallel.
13. charge-discharge circuit as claimed in claim 12 is characterized in that, said closing control circuit gradually also comprises:
First feedback loop, said first feedback loop are connected between the first input node and the discharge controller; With
Second feedback loop, said second feedback loop is connected in output node and recharges between the controller.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US36389910P | 2010-07-13 | 2010-07-13 | |
| US61/363,899 | 2010-07-13 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202206307U true CN202206307U (en) | 2012-04-25 |
Family
ID=45970402
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011202460139U Expired - Fee Related CN202206307U (en) | 2010-07-13 | 2011-07-13 | Gradual turn-off control circuit |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN202206307U (en) |
| TW (1) | TWM435033U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102938553A (en) * | 2012-10-29 | 2013-02-20 | 武汉长光科技有限公司 | DRYING-GASP alarm controlling circuit |
-
2011
- 2011-07-13 TW TW100212848U patent/TWM435033U/en not_active IP Right Cessation
- 2011-07-13 CN CN2011202460139U patent/CN202206307U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102938553A (en) * | 2012-10-29 | 2013-02-20 | 武汉长光科技有限公司 | DRYING-GASP alarm controlling circuit |
| CN102938553B (en) * | 2012-10-29 | 2016-01-13 | 武汉长光科技有限公司 | Power fail warning control circuit |
Also Published As
| Publication number | Publication date |
|---|---|
| TWM435033U (en) | 2012-08-01 |
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