CN202817699U - DC undervoltage tripping device and breaker - Google Patents
DC undervoltage tripping device and breaker Download PDFInfo
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- CN202817699U CN202817699U CN 201220386661 CN201220386661U CN202817699U CN 202817699 U CN202817699 U CN 202817699U CN 201220386661 CN201220386661 CN 201220386661 CN 201220386661 U CN201220386661 U CN 201220386661U CN 202817699 U CN202817699 U CN 202817699U
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Abstract
Disclosed are a DC undervoltage tripping device and a breaker. The DC undervoltage tripping device comprises a tripping mechanism and a control circuit. The control circuit comprises: an undervoltage detection module which is connected with a voltage detection input terminal, a tripping control module which is coupled with the undervoltage detection module and can be used for pulse width control, and a power module which is connected with the tripping control module and provides the tripping control module with working voltage. The tripping control module comprises a tripping controllable switch which is connected with the tripping mechanism and a PWM control chip which is coupled with the tripping controllable switch and is used for controlling off/on of the tripping controllable switch. Low power consumption is realized through the PWM control chip for pulse width control to control duty ratio of the output pulse signals. The PWM control chip is used to control the tripping mechanism to trigger tripping, so as to avoid possibility of malfunction caused by a vague intermediate state and raise accuracy and reliability.
Description
Technical field
The utility model relates to the distribution field, in particular, relates to a kind of direct current device for under-voltage releasing equipment and circuit breaker.
Background technology
Low-voltage circuit breaker is mainly born overload, the under voltage of distribution line and equipment, the usefulness of short-circuit protection.Under-voltage release is exactly above-mentioned circuit breaker carries out under voltage protection to low-voltage circuit and power consumption equipment mechanism.Under-voltage release needs long-term continuously energising, and its operating characteristics should reach: when the voltage detecting input terminal voltage be lower than rated operational voltage 35% the time, under-voltage release can not be closed, prevented breaker closing; When the voltage detecting input terminal voltage be equal to or greater than rated operational voltage 85% the time should be able to be closed, guarantee that circuit breaker is reliably closed; In the voltage detecting input terminal voltage dropped to 70% and 35% scope of rated operational voltage, device for under-voltage releasing equipment should disconnect; In addition, under-voltage release also must have high voltage withstanding ability, still has normal tripping characteristic behind 110%4 hours of tolerance rated voltage detection input terminal voltage.Namely require under-voltage release energy when low-voltage reliable closed, working properly when high voltage, coil does not burn out.
Present numerous device for under-voltage releasing equipment adopts clapper-type or electromagnet structure form (being that electromagnet discharges in the situation of low-voltage automatically) to realize under-voltage protection usually, all is with the later a kind of mechanism that is converted to mechanical energy to ferromagnetic material generation suction, electromagnetic energy of coil electricity take electromagnetic mechanism as main body.This structure exists release accuracy of action and the poor problem of consistency, and electromagnet causes trip coil to burn in that to keep the heating of adhesive (be coil under working condition long-time galvanization) stage serious easily.
The utility model content
Technical problem to be solved in the utility model provides a kind of direct current device for under-voltage releasing equipment and circuit breaker energy-conservation, that can accurately control the release action.
The purpose of this utility model is achieved through the following technical solutions:
A kind of direct current device for under-voltage releasing equipment, comprise tripping mechanism and control circuit, described control circuit comprise the under-voltage detection module that is connected with the voltage detecting input, with the dropout operational module of the carried out pulse width control of under-voltage detection module coupling, be connected with the dropout operational module provide the power module of operating voltage for the dropout operational module; Described dropout operational module comprise be connected with described tripping mechanism the dropout gate-controlled switch, with the coupling of described dropout gate-controlled switch, be used for the pwm chip that control dropout gate-controlled switch divides/closes.
Further, described tripping mechanism comprises magnetic flux coil and the actuating mechanism of threading off and moving with the triggering of magnetic flux coil coupling.
Further, be in series with current-limiting resistance between the output of described pwm chip and the described dropout gate-controlled switch.Current-limiting resistance can limit the electric current of control loop, the gate-controlled switch of avoiding threading off damage.
Further, described dropout operational module also is included in the first resistance, the second resistance, the 3rd resistance that connect successively of connecting and arranging between the both positive and negative polarity of voltage detecting input; Be provided with the first voltage stabilizing didoe between the negative pole of described voltage detecting input and the first resistance, the second resistance link; Described the second resistance, the 3rd resistance link are coupled to the MOD end of described pwm chip; Be provided with the 4th resistance between the negative pole of the SET of described pwm chip end and voltage detecting input, power end be connected the operating voltage of power module output and connect; The power end of described pwm chip is provided with filter capacitor with between the negative pole of voltage detecting input, and the 5th resistance and the 6th resistance of series connection setting, described the 5th resistance and the 6th resistance are arranged in parallel with filter capacitor, and its link is coupled to the DI V end of described pwm chip; The OUT end of described pwm chip is provided with current-limiting resistance with between the described dropout gate-controlled switch.This is a kind of concrete dropout operational module circuit based on pwm chip.
Further, described power module is connected between the both positive and negative polarity of voltage detecting input and is provided with the 7th resistance and the second voltage stabilizing didoe, and the burning voltage of described the second voltage stabilizing didoe is described pwm chip output services voltage.
Further, described under-voltage detection module is included in the 8th resistance and the 9th resistance of connecting and arranging between the both positive and negative polarity of voltage detecting input, and the 3rd voltage stabilizing didoe and the delay electric capacity of following the 9th resistance to be arranged in parallel; Series connection arranges between the both positive and negative polarity of voltage detecting input the tenth resistance and the first gate-controlled switch, the control end of described the first gate-controlled switch is coupled between described the 8th resistance and the 9th resistance; The 4th voltage stabilizing didoe that is arranged in parallel with described the first gate-controlled switch; Also comprise the negative pole that is arranged on the voltage detecting input and the second gate-controlled switch between the pwm chip, the control end of described the second gate-controlled switch is coupled between described the tenth resistance and the first gate-controlled switch.This is a kind of concrete under-voltage detection module structure; this under-voltage detection module has delay protection function; when accidental fluctuation appears in the voltage detecting input; when recovering normal voltage again after voltage transient descends; can guarantee the pwm chip attonity, improve the reliability of direct current device for under-voltage releasing equipment action.
Further, be provided with piezo-resistance between the both positive and negative polarity of the voltage detecting input of described direct current device for under-voltage releasing equipment.Piezo-resistance can be when the voltage detecting input terminal voltage increases suddenly, and resistance descends rapidly, produces transient high-current between voltage detecting input both positive and negative polarity, consumes most of energy, avoids the circuit burnout of back.
Further, described magnetic flux coil two ends parallel connection is provided with fly-wheel diode, and the negative electrode of described fly-wheel diode is coupled to the positive pole of voltage detecting input, and its anode is coupled to described dropout gate-controlled switch.When the dropout gate-controlled switch disconnected, the magnetic flux coil can discharge by fly-wheel diode like this, and the energy in the coil is in time consumed, and can guarantee that like this induced current of coil generation is to the impact of dropout gate-controlled switch and circuit.
Further, the model of described pwm chip is LTC6992.This is a kind of concrete pwm chip.
A kind of circuit breaker comprises a kind of direct current device for under-voltage releasing equipment of the present utility model.
Circuit breaker of the present utility model comprises a kind of direct current device for under-voltage releasing equipment, the duty ratio of the pwm chip control output pulse signal by can carrying out pulse width control, and the little electric current of output is realized low-power consumption under rated operational voltage; And control tripping mechanism by pwm chip and trigger dropout, the under-voltage detection module and the power port of pwm chip is coupled, carry out under-voltage judgement by under-voltage detection module, whether the operating voltage that pwm chip U1 is exported in control is controlled pwm chip and is come into operation, compare the under-voltage control mode of aanalogvoltage mode, reliability is high, and the intermediateness of avoiding bluring causes the possibility of misoperation, circuit structure is simple, improves release accuracy of action and reliability.
Description of drawings
Fig. 1 is the schematic diagram of the utility model circuit breaker;
Fig. 2 is the principle schematic of the utility model direct current device for under-voltage releasing equipment;
Fig. 3 is that the utility model is based on the embodiment principle schematic of LTC6992 chip;
Fig. 4 is that LTC6992 chip pin and peripheral circuit in the present embodiment thereof consist of schematic diagram;
Wherein: 1, circuit breaker; 11, operating mechanism; 12, contact apparatus; 13, instantaneous trip device; 14, delayed releasing device; 2, direct current device for under-voltage releasing equipment; 21, control circuit; 211, power module; 212, under-voltage detection module; 213, dropout operational module; 22, tripping mechanism; 221, magnetic flux coil; 222, actuating mechanism; 23, the positive pole of voltage detecting input; 24, the negative pole of voltage detecting input.
Embodiment
Shown in Fig. 1-2, the utility model provides a kind of circuit breaker, comprising: the contact apparatus 12 that is connected with the both positive and negative polarity of power supply, with instantaneous trip device 13, the delayed releasing device 14 of contact apparatus 12 outputs coupling; Operating mechanism 11 with described contact apparatus 12, instantaneous trip device 13 and 14 couplings of delayed releasing device; Described operating mechanism 11 also is coupled with a kind of direct current device for under-voltage releasing equipment 2; Described operating mechanism 11 can receive the control signal of instantaneous trip device 13, delayed releasing device 14 and direct current device for under-voltage releasing equipment 2 simultaneously, and control contact apparatus 12 divides/closing operation.
Direct current device for under-voltage releasing equipment 2 of the present utility model comprises control circuit 21 and tripping mechanism 22.Tripping mechanism 22 comprises magnetic flux coil 221 and the actuating mechanism 222 of threading off and moving with the triggering of magnetic flux coil 221 couplings; Described control circuit 21 comprise the under-voltage detection module 212 that is connected with the both positive and negative polarity of voltage detecting input, with the dropout operational module 213 of the carried out pulse width control of under-voltage detection module 212 couplings, be connected with dropout operational module 213 provide the power module 211 of operating voltage for dropout operational module 213.Dropout operational module 213 comprises the dropout gate-controlled switch (MOSFET V3) of connecting with the magnetic flux coil 221 of described tripping mechanism 22, with described MOSFET V3 coupling, be used for the pwm chip U1(pulse width modulation controlled chip of the carried out pulse width control that control MOSFET V3 divides/close).When direct current device for under-voltage releasing equipment 2 detects voltage and is lower than threshold values, magnetic flux coil 221 no powers, 2 actions of direct current device for under-voltage releasing equipment, actuating mechanism 222 trigger action mechanisms 11 thread off, so that circuit breaker 1 separating brake, if voltage continues to be lower than threshold values, magnetic flux coil 221 no powers of direct current device for under-voltage releasing equipment 2, actuating mechanism 222 just can not reset in adhesive, therefore circuit breaker 1 just closes not brake application, and when detecting the voltage recovery, namely voltage is normal, this moment, 221 energisings of direct current device for under-voltage releasing equipment 2 magnetic flux coils resetted by actuating mechanism 222 adhesives that drive direct current device for under-voltage releasing equipment 2 in the process of breaker body 1 combined floodgate.
Circuit breaker of the present utility model comprises a kind of direct current device for under-voltage releasing equipment, described direct current device for under-voltage releasing equipment is owing to the MOSFET V3 that connected at the magnetic flux wire loop, and control divide/closing of MOSFET V3 by pwm chip U1, the power circuit at magnetic flux coil place need not to judge the height of input voltage like this, the circuit structure in loop is simple, and reliability is high; The under-voltage detection module and the power port of pwm chip U1 is coupled, carry out under-voltage judgement by under-voltage detection module, whether the operating voltage that pwm chip U1 is exported in control is controlled pwm chip U1 and is come into operation, compare the under-voltage control mode of aanalogvoltage mode, reliability is high, the intermediateness of avoiding bluring causes the possibility of misoperation, further improves release accuracy of action and reliability.Simultaneously, electromagnet is being kept adhesive (being magnetic flux coil long-time galvanization under working condition) stage heating seriously, and power is high and cause easily the magnetic flux coil burnout, and particularly in overtension, the electric current of magnetic flux coil increases, easier burning; Therefore, control the duty ratio of output pulse signal by the pwm chip U1 that can carry out pulse width control, when voltage raises, the output pulse signal duty ratio reduces, by the corresponding reduction of the electric current of magnetic flux coil to keep low-power consumption, little electric current is kept the attracting state of magnetic flux coil in the adhesive of magnetic flux coil, realizes the low-power consumption that needs under rated operational voltage.Following LTC6992 chip is example, and the utility model is described in further detail with preferred embodiment by reference to the accompanying drawings, and pwm chip described in the utility model is not limited only to the LTC6992 chip, but the LTC6992 chip is preferred version.
Participate in Fig. 3-4, the direct current device for under-voltage releasing equipment is from the anodal 23(V of voltage detecting input
+) and the negative pole 24 (V of voltage detecting input
-) power taking, comprise successively power module 211, under-voltage detection module 212 and dropout operational module 213.
Under-voltage detection module 212 is included in resistance R 8 and the resistance R 9 of connecting and arranging between the both positive and negative polarity of voltage detecting input, and the 3rd voltage stabilizing didoe D3, the delay electric capacity C2 that follow resistance R 9 to be arranged in parallel; Series connection arranges between the both positive and negative polarity of voltage detecting input resistance R 10 and the first gate-controlled switch (MOSFET V1); The control end of MOSFET V1 is coupled between described resistance R 8 and the resistance R 9; MOSFET V1 has been arranged in parallel the 4th voltage stabilizing didoe D4.Under-voltage detection module 212 also comprises negative pole and the second gate-controlled switch between the pwm chip U1 (MOSFET V2) that is arranged on the voltage detecting input, and the control end of MOSFET V2 is coupled between resistance R 10 and the MOSFET V1.The source electrode of MOSFET V2 is connected with the negative pole of voltage detecting input, the power end (V of drain electrode and pwm chip U1
+) connect, under-voltage detection module 212 is controlled the operating voltage of exporting to pwm chip U1 by divide/closing of MOSFET V2, the startup of realization pwm chip U1/shutoff.This under-voltage detection module 212 has delay protection function; when accidental fluctuation appears in the voltage detecting input; when recovering normal voltage again after voltage transient descends; can guarantee pwm chip U1 attonity; continue to keep the adhesive of magnetic flux coil 221, improve the reliability of direct current device for under-voltage releasing equipment action.
Corresponding dropout operational module 213, series connection arranges between the both positive and negative polarity of voltage detecting input resistance R 1, resistance R 2, resistance R 3; Be provided with the first voltage stabilizing didoe D1 between the negative pole of voltage detecting input and resistance R 1, resistance R 2 links; Resistance R 2, resistance R 3 links are coupled to the MOD end of described pwm chip U1; Be provided with resistance R 4 between the SET end of pwm chip U1 and the negative pole of voltage detecting input; Power end (the V of pwm chip U1
+) be connected the operating voltage of power module 211 output and connect; Power end (the V of described pwm chip U1
+) be provided with filter capacitor C1 with between the negative pole of voltage detecting input, and resistance R 5 and the resistance R 6 of series connection setting, resistance R 5 and resistance R 6 are arranged in parallel with filter capacitor C1, and its link is coupled to the DIV end of described pwm chip U1; The OUT end of pwm chip U1 is provided with current-limiting resistance R11 with between the described MOSFET V3.Further, the 221 two ends parallel connections of magnetic flux coil are provided with sustained diode 5, and the negative electrode of sustained diode 5 is coupled to the positive pole of voltage detecting input, and its anode is coupled to described MOSFET V3.When MOSFET V3 disconnected, magnetic flux coil 221 can in time consume the energy in the coil by sustained diode 5 discharges like this, can guarantee that like this induced current of coil generation is to the impact of MOSFET and circuit.
Resistance R 1 in the dropout operational module 213, resistance R 2, resistance R 3 are for pattern arranges resistance, and the first voltage stabilizing didoe D1 is in parallel with the resistance string that resistance R 2, resistance R 3 form in fact, and is constant with the pressure reduction of guaranteeing resistance R 2, resistance R 3.And the MOD of pwm chip U1 end is coupled between resistance R 2, the resistance R 3, under the prerequisite that resistance R 2, resistance R 3 resistances are fixed, makes the voltage of MOD end also keep constant when detecting voltage greater than certain value, to guarantee the stability of model selection.Resistance R 5 and resistance R 6 are divider resistances, and be same, because stable operating voltage, in the certain situation of resistance R 5 and resistance R 6 resistances, the voltage that is coupled to the DI V end of the pwm chip U1 between them also is constant.
Present embodiment is controlled the work and the accurate protection action of closing to realize release of pwm chip U1 by under-voltage detection module 212.When the voltage of voltage detecting input is the normal rating operating voltage, the voltage of the divider resistance R9 end (being the gate pole of V1) of under-voltage detection module 212 is the conducting voltage of MOSFET V1, the V1 conducting, the source class voltage of V1 is low, the gate pole conducting voltage that is MOSFET V2 is low, then MOSFET V2 cut-off, the voltage of the power end of pwm chip U1 is the operating voltage 5V of described power module output at this moment, the drain voltage of MOSFET V2 also is 5V, pwm chip U1 normal operation, the Continuity signal of the OUT end output mos FET V3 of pwm chip U1, MOSFET V3 conducting, tripping mechanism 22 attracting states; When the voltage of voltage detecting input is lower than the setting operation voltage, the voltage of divider resistance R9 end is lower than the conducting voltage of V1, the V1 cut-off, the voltage stabilization of the 4th voltage stabilizing didoe D4 is at 5V, the gate pole conducting voltage that is MOSFETV2 is 5V, the V2 conducting, the source voltage of V2 is low, this moment, the power end because of pwm chip U1 was connected voltage also for low with the drain electrode of MOSFET V2, then pwm chip U1 quits work, magnetic flux coil 221 discharges, actuating mechanism 222 actions, and band pneumatic operating mechanism 11 control contact apparatus 12 are carried out the disjunction operation.
After elected mould-fixed arranges resistance (R4/R5/R6) and divider resistance (R1/R2/R3) in the dropout operational module 213; during the change in voltage of voltage detecting input; the pulsewidth of pwm chip LTC6992 output pulse signal also can correspondingly change; when voltage raises; the output pulse signal duty ratio reduces, by the corresponding reduction of the electric current of magnetic flux coil, to keep low-power consumption; the low-power consumption that realization needs under rated operational voltage also can protect the magnetic flux coil not burnt by large electric current simultaneously.
Above content is in conjunction with concrete preferred implementation further detailed description of the utility model, can not assert that implementation of the present utility model is confined to these explanations.For the utility model person of an ordinary skill in the technical field, without departing from the concept of the premise utility, can also make some simple deduction or replace, all should be considered as belonging to protection range of the present utility model.
Claims (10)
1. a direct current device for under-voltage releasing equipment comprises tripping mechanism and control circuit, it is characterized in that,
Described control circuit comprise the under-voltage detection module that is connected with the voltage detecting input, with the dropout operational module of the carried out pulse width control of under-voltage detection module coupling, be connected with the dropout operational module provide the power module of operating voltage for the dropout operational module;
Described dropout operational module comprise be connected with described tripping mechanism the dropout gate-controlled switch, with the coupling of described dropout gate-controlled switch, be used for the pwm chip that control dropout gate-controlled switch divides/closes.
2. a kind of direct current device for under-voltage releasing equipment as claimed in claim 1 is characterized in that, described tripping mechanism comprises magnetic flux coil and the actuating mechanism of threading off and moving with the triggering of magnetic flux coil coupling.
3. a kind of direct current device for under-voltage releasing equipment as claimed in claim 1 is characterized in that, is in series with current-limiting resistance between the output of described pwm chip and the described dropout gate-controlled switch.
4. a kind of direct current device for under-voltage releasing equipment as claimed in claim 1 is characterized in that, described dropout operational module also comprises:
Series connection arranges between the both positive and negative polarity of voltage detecting input the first resistance, the second resistance, the 3rd resistance that connect successively; Be provided with the first voltage stabilizing didoe between the negative pole of described voltage detecting input and the first resistance, the second resistance link;
Described the second resistance, the 3rd resistance link are coupled to the MOD end of described pwm chip;
Be provided with the 4th resistance between the negative pole of the SET of described pwm chip end and voltage detecting input, power end be connected the operating voltage of power module output and connect;
The power end of described pwm chip is provided with filter capacitor with between the negative pole of voltage detecting input, and the 5th resistance and the 6th resistance of series connection setting, described the 5th resistance and the 6th resistance are arranged in parallel with filter capacitor, and its link is coupled to the DIV end of described pwm chip;
The OUT end of described pwm chip is provided with current-limiting resistance with between the described dropout gate-controlled switch.
5. a kind of direct current device for under-voltage releasing equipment as claimed in claim 1, it is characterized in that, described power module is connected between the both positive and negative polarity of voltage detecting input and is provided with the 7th resistance and the second voltage stabilizing didoe, and the burning voltage of described the second voltage stabilizing didoe is described pwm chip output services voltage.
6. a kind of direct current device for under-voltage releasing equipment as claimed in claim 1 is characterized in that, described under-voltage detection module comprises:
Series connection arranges between the both positive and negative polarity of voltage detecting input the 8th resistance and the 9th resistance, and the 3rd voltage stabilizing didoe and the delay electric capacity of following the 9th resistance to be arranged in parallel;
Series connection arranges between the both positive and negative polarity of voltage detecting input the tenth resistance and the first gate-controlled switch, the control end of described the first gate-controlled switch is coupled between described the 8th resistance and the 9th resistance;
The 4th voltage stabilizing didoe that is arranged in parallel with described the first gate-controlled switch;
Also comprise the negative pole that is arranged on the voltage detecting input and the second gate-controlled switch between the pwm chip, the control end of described the second gate-controlled switch is coupled between described the tenth resistance and the first gate-controlled switch.
7. a kind of direct current device for under-voltage releasing equipment as claimed in claim 1 is characterized in that, is provided with piezo-resistance between the both positive and negative polarity of the voltage detecting input of described direct current device for under-voltage releasing equipment.
8. a kind of direct current device for under-voltage releasing equipment as claimed in claim 3, it is characterized in that, described magnetic flux coil two ends parallel connection is provided with fly-wheel diode, and the negative electrode of described fly-wheel diode is coupled to the positive pole of voltage detecting input, and its anode is coupled to described dropout gate-controlled switch.
9. a kind of direct current device for under-voltage releasing equipment as claimed in claim 1 is characterized in that, the model of described pwm chip is LTC6992.
10. a circuit breaker is characterized in that, comprises such as the arbitrary described a kind of direct current device for under-voltage releasing equipment of claim 1～9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220386661 CN202817699U (en) | 2012-08-06 | 2012-08-06 | DC undervoltage tripping device and breaker |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220386661 CN202817699U (en) | 2012-08-06 | 2012-08-06 | DC undervoltage tripping device and breaker |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202817699U true CN202817699U (en) | 2013-03-20 |
Family
ID=47876513
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220386661 Expired - Lifetime CN202817699U (en) | 2012-08-06 | 2012-08-06 | DC undervoltage tripping device and breaker |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202817699U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102790375A (en) * | 2012-08-06 | 2012-11-21 | 上海诺雅克电气有限公司 | Direct current undervoltage release and circuit breaker |
| CN107210161A (en) * | 2015-01-30 | 2017-09-26 | 通用电器技术有限公司 | For the under-voltage release circuit for the operating mechanism for making voltage circuit breakers tripping operation |
-
2012
- 2012-08-06 CN CN 201220386661 patent/CN202817699U/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102790375A (en) * | 2012-08-06 | 2012-11-21 | 上海诺雅克电气有限公司 | Direct current undervoltage release and circuit breaker |
| CN102790375B (en) * | 2012-08-06 | 2015-04-22 | 上海诺雅克电气有限公司 | Direct current undervoltage release and circuit breaker |
| CN107210161A (en) * | 2015-01-30 | 2017-09-26 | 通用电器技术有限公司 | For the under-voltage release circuit for the operating mechanism for making voltage circuit breakers tripping operation |
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|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
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Granted publication date: 20130320 |