CN1711671A - Protection circuit and method for floating power transfer device - Google Patents
Protection circuit and method for floating power transfer device Download PDFInfo
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- CN1711671A CN1711671A CN 200380103488 CN200380103488A CN1711671A CN 1711671 A CN1711671 A CN 1711671A CN 200380103488 CN200380103488 CN 200380103488 CN 200380103488 A CN200380103488 A CN 200380103488A CN 1711671 A CN1711671 A CN 1711671A
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Abstract
A protection circuit and method are provided for a floating power transfer device having one or more switches for controlling charging of a storage capacitor across which a load is applied in use. The protection circuit includes a control circuit (43), a fault detection circuit (33), and a precharge driver circuit (47). A control circuit (43) controls, at least in part, switching of the at least one switch (36, 37), and a fault detection circuit (33) is used to detect when a fault occurs in at least one of the floating power transfer device or the load and to send a fault detection signal to the control circuit (43) in response thereto. The precharge driver circuit (47) is enabled by the control circuit (43) in response to receiving the fault detection signal, the enabling precharge driver circuit (47) attempting to precharge the storage capacitor (35) to a voltage level sufficient for switching the one or more switches (36, 37) for continued operation without damaging the switches (36, 37).
Description
Generally speaking, the present invention relates to a kind of power transfer device, specifically, relate to a kind of protective circuit and guard method that is used for the low resistance switches of floating power transfer device.
Many system designs comprise that power conversion circuit is to obtain required operating voltage.A kind of such power conversion circuit is a charge pump.Charge pump is a kind ofly to be used to cause the increase of supply voltage or to be used for supply voltage anti-phase to generate the equipment of separate power source (split supply).Many application with the use Nonvolatile memory circuit in these equipment are relevant, and it needs high voltage to be used for programming.In traditional charge pump power translation circuit, the terminal that load equipment is connected into it is that (ground connection is with reference to (groundreference) typically) in the power supply terminal is common.U.S. Patent No. 4,807,104 disclose a kind of power conversion circuit, and it is the charge pump that had not only carried out voltage multiplication but also carried out voltage inversion.Yet the output of this power conversion circuit keeps the reference of butt joint ground node.
In some system implementation mode, it may be useful using floating power transfer device that this system is powered.By this power transfer device that floats, if a terminal in this system is wanted short circuit, this system still can continue operation so.For instance, in an automobile bus network (automobile bus network), the signaling moiety of the system on this bus can float with respect to any other reference, as ground or Vdd.This just can provide the fault-tolerant ability of enhancing by allowing still to allow to communicate by letter in the time of being short-circuited at its terminal place.
By providing protective circuit to overcome the shortcoming of prior art for floating power transfer device and bringing extra advantage.This protective circuit comprises control circuit, failure detector circuit and precharge driver circuit.The switching of at least one switch of control circuit control floating power transfer device, wherein this at least one switch control charging that the storage capacitance of this equipment of applying a load at its two ends is carried out during use.When the failure detector circuit detection failure occurs among in floating power transfer device and this load at least one, and in response to this fault detection signal is sent to control circuit.Precharge driver circuit is carried out pre-charge to storage capacitance, and in response to receiving from the fault detection signal of failure detector circuit and enable by control circuit.When it was activated, precharge driver circuit attempted to precharge the reservoir capacitor to a voltage level, this voltage level enough be used for to this at least one switch switch in case continue the operation and can not damage this switch.
In yet another aspect, provide a kind of floating power transfer device.The supply voltage that this floating power transfer device comprises storage capacitance (applying load at its two ends in use) and is used for storage capacitance is charged.At least one switch of coupling perhaps disconnects from storage capacitance optionally supply voltage is connected to store electricity between supply voltage and storage capacitance.For this at least one switch provides protective circuit.This protective circuit comprises control circuit, failure detector circuit and precharge driver circuit.This control circuit is controlled the switching of at least one switch of floating power transfer device at least in part, and failure detector circuit detects the fault in floating power transfer device or load, and in response to this fault detection signal is sent to control circuit.Enable precharge driver circuit in response to receiving fault detection signal by control circuit, and when it is activated, precharge driver circuit attempts this electric capacity is precharged to a voltage level, and this voltage level enough is used for this at least one switch switched and can damage this at least one switch so that continues to operate.
Another aspect provides a kind of method that is used to protect the switch of floating power transfer device.This method comprises: control the switching of at least one switch, this at least one switch control is to the charging of the storage capacitance of the floating power transfer device that applies load at its two ends during use; Monitor in floating power equipment and the load at least one with detection failure, and generate fault detection signal based on detecting fault; And attempting to precharge the reservoir capacitor to a voltage level in response to the generation of fault detection signal, this voltage level enough is used for this at least one switch switched and can damage this at least one switch so that continue operation.
To realize additional feature and advantage by technology of the present invention.This describe in detail other embodiments of the invention and aspect, and it is considered as the part of the present invention for required protection.
In the claim at the conclusion place of specification, particularly point out and be considered to theme of the present invention, and claimed to it clearly.By reading the following detailed description of carrying out in conjunction with following accompanying drawing, aforementioned and other purpose, feature and advantage of the present invention will be conspicuous, wherein:
Fig. 1 is that to be used for by the ground connection reference capacitance be the schematic diagram of an embodiment of power transfer device of the ground connection reference of electric;
Fig. 2 is that to be used for by the storage capacitance of floating be the schematic diagram of an embodiment of the floating power transfer device of load transmission power;
Fig. 3 according to one aspect of the present invention, be used for the schematic diagram of an embodiment of the protective circuit of floating power transfer device;
Fig. 4 according to one aspect of the present invention, be used for the schematic diagram of another embodiment of the protective circuit of floating power transfer device;
Fig. 5 according to one aspect of the present invention, be used for the schematic diagram of another embodiment of the protective circuit of floating power transfer device;
Fig. 6 according to one aspect of the present invention, be used for the schematic diagram of an embodiment of failure detector circuit of the protective circuit of Fig. 3-5;
Fig. 7 according to one aspect of the present invention, be used in the schematic diagram of having in the failure detector circuit of Fig. 6 with reference to an embodiment of the comparator of the gate clamps (gate-clamp) of ground connection node;
Fig. 8 is according to one aspect of the present invention, is used in the schematic diagram with reference to another embodiment of the comparator of the gate clamps of positive supply of having in the failure detector circuit of Fig. 6;
Fig. 9 is according to one aspect of the present invention, is used for the detailed maps of an embodiment of precharge driver circuit of the protective circuit of Fig. 3-5.
Description, the identical Reference numeral that uses among the wherein different figure is indicated same or analogous assembly.An embodiment who is used to the power transfer device of load 12 power supplies shown in Figure 1.This charge transfer device under the control of signal generator 15, via switch 13 with charge transport to electric capacity 11.Provide electric charge by supply voltage (Vdd) 14.The power transfer device of Fig. 1 is known as the charge transfer device of ground connection reference, because this equipment is electric by the ground connection reference capacitance.
In Fig. 2, described the relocatable form of power transfer device.In the figure, be load 21 power supplies by storage capacitance 22.Give electric capacity 22 via switch 23 and 24 with charge transport, described switch is operate in tandem under the control of voltage switching signal 25.When two switches all closed (just, connecting), apply supply voltage (Vdd) 26 at electric capacity 22 two ends.This power transfer device is in unsteady, because when charge switch 23,24 was opened (just, disconnecting), electric capacity 22 was isolated from earthing power supply 26.When this circuit being used for to the load equipment transmission power (for example, as the part of voltage multiplie), being desirably in the electric capacity two ends has a constant bias.The power of carrying to load has produced pulsating voltage (ripple voltage) on storage capacitance, it is added on this bias voltage.When switch 23,24 closures (just, connect), replenish the electric charge (Q) lost and storage capacitance voltage is increased to source value (Vdd).
Load in Fig. 1 or 2 can be the circuit of any kind, comprise any shown in the duplicating of circuit, wherein use electric capacity (11 or 22) to replace voltage source (14 or 26 respectively.) in metal-oxide semiconductor (MOS) (MOS) integrated circuit, realize switch with transistor.The conducting resistance of the dynamic characteristic of this device rendered definite circuit operation.
When power transfer device initially is switched on, at electric capacity (perhaps load) two ends short trouble appears perhaps, and all supply voltage just is applied to the switchgear two ends.In general, these circuit are applied in the low power applications, and wherein switch resistance can be very high, and normally low (for example, less than the 5V) of supply voltage.In this case, can not need protect it at such operating condition.
Yet if use charge transfer device to come to be the load transmission power, starting and fault state can produce potential destructive mode of operation.For such equipment, switching transistor to be made low ohm to reduce system loss, this also can reduce power loss in the charging stage of operation.When not having the bias voltage that is pre-existing on the storage capacitance (for example, electric capacity 11 among Fig. 1 or 2 or electric capacity 22), the very high electric current switch of flowing through is possible.For instance, have 1
Switch resistance and the power supply of 20V, then have the electric current of 20A, the simple dissipation that 400W is arranged.In separate devices, this is possible, but does not have integrated solution cheaply.In general, may there be the pressure reduction of 1V in switch ends in circuit, so produced the electric current of the 1A that is easier to handle.
At present, unsteady charge transfer device concentrates on low power system, and its power that can be absorbed in during starts increases.In these systems, switch has usually than higher impedance in the situation of floating power transfer device as discussed herein.
Therefore, in the floating capacitance charging circuit, just be known as in the floating power transfer device, provide a kind of protective circuit and guard method here at this, with avoid for example the starting or fault state during too much electric current and power dissipation.The protective circuit of the following stated is the low-voltage at direct or indirect detection of stored electric capacity two ends during any one operational phase for example.A characteristic of floating capacitance be electric capacity float to during the switch disabled (just, disconnect) power ground with reference on or under ability.Equally, a problem that will solve in the situation that protective circuit is provided for switch is that fault detect need be sent to earthing power supply side (just, Vdd, gnd node) from the floating capacitance side (just, Cap+, Cap-node) of power transfer device.
In Fig. 3, described according to a floating power transfer device of one aspect of the present invention and an embodiment of protective circuit.This equipment comprises the pair of switches 36,37 that is used for during the normal running, storage capacitance 35, and the power supply 49 of an end ground connection 48.These assemblies have constituted a kind of the sort of circuit depicted in figure 2 that is similar to together.This circuit is load 50 power supplies in use.
Protective circuit comprises failure detector circuit 33, and it can monitor the voltage at electric capacity 35 two ends directly or indirectly.In this embodiment, failure detector circuit 33 is connected between terminal Cap+31 and the Cap-32, can obtain its power supply from same terminal.Failure detector circuit can be a passive detector, and it can operated under any peaked all possible voltage from 0V.In an example,, then determine to have taken place fault when the voltage at storage capacitance 35 two ends drops to a fault threshold when following.This threshold value is set to enough low, so that allow normal running, switch 36,37 is damaged because the mistake multiple current is flowed through to prevent to be set to enough height simultaneously.For example, the power supply of 20V is arranged, and switch resistance is 1
, the minimum capacity voltage before then the maximum current of 2A needs protection is set to 16V.Therefore, if be short-circuited during normal running, perhaps a certain other incident causes capacitance voltage to drop to below the fault threshold (for example, being 16V in this embodiment), then statement (assert) fault detection signal 46.Send this signal to control circuit 43 by floating to ground translator 34, with output 45 as the level shifter that floats.Circuit 34 is connected asking of floating node 31,32, and between the ground connection reference node 41,40.Control circuit 43 may be implemented as logical circuit, perhaps is implemented as handling failure detection signal and decision and whether allows main switch 36 and 37 programs of connecting.
Though when connecting, can be from the source 49 obtain voltages, storage capacitance 35 is fully discharged, and that is to say, the voltage of this electric capacity is 0V.In this case, by failure detector circuit 33 detection failure, and signal the existence of control circuit 43 faults.When electric capacity keeps this state, enable switch 36,37 and will cause switch fault.This may be instant (immediate) fault, perhaps may show as assembly by the life-span of brachymemma, this depends on that the voltage with electric capacity returns to its time that normal condition spent.
In one embodiment, control circuit 43 serves as the interface between normal control logic and the switch 36,37.Determine the state (on node switch 44) of switch by interface node uPIO 42 from the control signal of external equipment.Fault_IN is connected to failure detector circuit 33 by the level shifter 34 that floats.The additional signal of indicating fault status can offer external equipment via interface uPIO 42.
When the statement fault, controll block 43 guarantees that switch 36,37 is disabled, with the further dissipation that prevents to be caused by these switches.On the suitable control stage (just, when switch is normally enabled), enable independent precharge driver circuit 47 at the next one.This circuit 47 can not cause damage to this circuit for storage capacitance 35 delivered charge.It can prevent that by using charging process from causing the current limliting output equipment of extra power dissipation to reach this purpose.When enabling switch open (SWON) input with charging driver circuit 47 again, output 38,39 is connected and the electric capacity charging.Control circuit 43 can continue to enable these output 38,39, and up to eliminating detected fault state, perhaps it can circulate by each maintenance stage of charging, with the normal mode of simulated operation.By this method, protective circuit prevents to damage the electric current power transfer device of flowing through during start-up period.A result of this technology is to need minimum starting cycle before the beginning normal running.Determine the duration in this cycle by various factors that influences circuit operation and the required level of protection.In an actual execution mode, can increase the additional delay of some normal switch cycles, before enabling entire circuit, arrived stable mode of operation to guarantee system.External control devices can be known starting condition and use this information to enable above-mentioned starting sequence.Under these circumstances, may use different control sequence with fault state for starting.
When taking place to cause the voltage on electric capacity 35 for example to drop to fault below the fault threshold of setting during the normal running, switch 36,37 disconnects, and controll block 43 attempts resetting this circuit.This can follow whole starting cycle (when between starting and fault when not distinct), perhaps can follow the cycle of a shortening.The cycle that shortens can charge to this electric capacity 35, disconnects precharge driver circuit 47 then and assesses this fault-signal once more.If there is not further malfunction to be detected, control turns back to normal running so.In the whole cycle, carry out the starting of repetition and attempt.When having carried out surpassing the trial of pre-determined number, circuit is concluded to be in malfunction, and control circuit 43 is forbidden further attempting up to being resetted by a certain external control.A fault status signal can send back external control by uPIO node 42.
Fig. 4 has described the improvement to the protected floating power transfer device of Fig. 3.In this embodiment, provide hot testing circuit 60 to improve fault detect.When single integrated circuit (IC) is gone up this equipment of realization and testing circuit, temperature detection can be useful.When breaking down and circuit operation during near this failure determination threshold value, IC can illustrate extra power dissipation.When this situation took place, chip temperature increased sharply, and hot testing circuit 60 can detect the variations in temperature of the opereating specification that exceeds normal, expected.Output signal 61 is to control circuit 43 statement faults.In this case, can register error type and forbidding output switch 36,37.Can attempt resetting, and if detect fault once more, then control circuit can carry out mark by uPIO 42 interfaces to fault once more, and with its returning to external logic.When this situation took place, control circuit prevented that any further switching manipulation from beginning one up to external signal and resetting.Balance between protective circuit depicted in figure 4 and the floating power transfer device is as above operated like that in conjunction with Fig. 3 is described.
Under certain conditions, Fig. 3 and 4 protective circuit can be simplified by the unsteady level shifter of deleting among these figure 34.In Fig. 5, described the execution mode that finally obtains.By deleting unsteady level shifter, fault detect becomes and only takes place when switch 36,37 is activated Shi Caihui.The output of current failure detector circuit 43 is also with reference to ground connection node 48.The operating principle of this modification makes error detection occur in during the first in switch closure stage.Perhaps, low-current precharge driver circuit 47 can be activated prior to switch, and this occurs short detection-phase with regard to allowing prior to the principle power phase of enabling switch 36,37.When this method of employing, the testing circuit that is connected between the electric capacity may mainly be a passive device.
Below with reference to the various concrete details in the execution mode of each embodiment of the protective circuit of figure 6-9 key diagram 3-5.Protective circuit described herein can constitute the part of conventional IC, and it uses double-diffused metal oxide semiconductor (DMOS) transistor for switchgear.Silicon-on-insulator (SOI) structure allows each independent transistor to be electrically insulated from each other.Fault detect can be followed form shown in Figure 5, uses passive detection devices.
Fig. 6 has described an embodiment of failure detector circuit 33.This circuit comprises fault reference generation circuit 70, and it produces two output reference values 78,79 (just, with respect to the ref-78 on ground, and with respect to the ref+79 of positive supply 49).Two comparators 71 and 72 close in switching during (just connecting), and these reference voltages and voltage on storage capacitance 35 are compared.This allows the detection to the excess voltage drops at each switch 36,37 two ends.Do like this is in order to enable the detection to the short circuit on electric capacity output node 31,32.Short circuit may only be illustrated in a fault on the terminal, so two all should be tested to guarantee covering potential damage fault state fully.The output that finally obtains can be combined into single fault detection signal and mark 46.Comparator has the input and the gate clamps of high impedance, is damaged during the unsteady stage of operation with the input that prevents them.Fault reference generation circuit 70 can be any any circuit that can produce with respect to two power source voltage references.The required value of reference voltage is determined by the ability of switch resistance and IC dissipation power.
In Fig. 7 and 8, described to be used for other embodiment of comparator circuit 72,71 of the failure detector circuit 33 of Fig. 6 respectively.In Fig. 7, described to have comparator, and the positive supply with reference to gate clamps has been shown among Fig. 8 with reference to the gate clamps of ground connection node.Operating principle is identical for both.High value series connection input resistance R84,83 isolates its input respectively with the comparator 72,71 of Fig. 7 and 8.Zener diode 86,96 inputs with comparator are clamped on the voltage that does not exceed its input puncture voltage.If output voltage swing exceeds supply voltage (ground in Fig. 7 and 8 or Vdd respectively), Zener diode 86,96 effects resemble a diode and the restriction input amplitude of oscillation in the opposite direction so.
The circuit of Fig. 9 shows a kind of execution mode of precharge driver circuit 47, and it comprises sub-piece of current reference and output.Current source 101 definition minimum currents (for example, 2 μ A).Transistor 102,103,104 constitutes the current mirror (it comprises node SRC-126) with two outputs, is used to reflect reference current.Be used for the complementary current mirror that constitutes by transistor 105,106 from the output of transistor M_1 103, produce single output node SRC+127.Forbid output SRC+, the SRC-of the sub-piece of current references by two switches 108,109 of ENABLE (enabling) input 107 controls.Complementary output part 112,113,121,122,123,124,125 and 114,115,116,117,118,119,120 produces the current limliting output of being gone into control by the ENABLE elm.When switch 120,121 was connected, output disconnected, and can not obtain electric current at terminal SW+ and SW-125,119 places.Output diode 118,124 guarantees to export the implicit diodes (implicit diode) of DMOS transistor 116,123 when storage capacitance (being connected between SW+ and the SW-terminal 125,119) is floated with respect to ground 111, never by forward bias.In the sub-piece of current reference, use electric current convergent-divergent (current scaling), so that reference current promoted 10% the factor.For output SW+125, ratio by combined resistance 112,113 and transistor ratio 122,123 obtain another 200%.With similar methods convergent-divergent output SW-119.
The overall accuracy that is obtained by precharge driver circuit is not crucial for its performance.Its major function is to make it possible to be started or after fault is detected, storage capacitance is carried out safe charging at circuit.The timing of starting can improve by the control more closely to charging current, but its benefit need be weighed with respect to the circuit complexity that increases.In normal running, only during starts can switch precharge driver circuit 47 in controlled, perhaps can constantly switch synchronously with main switch 36,37.
Control circuit 43 (referring to Fig. 3-5) comprises the digital function of system.This control circuit receives fault detection signal, comes it is responded and report is returned to external equipment by cut-off switch 36,37.External equipment can begin starting (supposing it is the prior art of this system) by start_control (starting _ control) circuit 43.
Though in this depicted in greater detail with each preferred embodiment has been described, but for the person of ordinary skill in the field, the various modifications that do not break away from spirit of the present invention and carry out, augment, displacement etc. all is conspicuous, and therefore they can be considered as within the scope of the present invention that is limited by the appended claim book.
Claims (19)
1, a kind of protective circuit, comprise: control circuit (43), be used to control the switching of at least one switch (36,37) of floating power transfer device, during use, this at least one switch (36,37) is controlled the charging to the storage capacitance (35) that applies the floating power transfer device of load at its two ends; Failure detector circuit (33) is used for detecting at least one fault that takes place in floating power transfer device and this load, and in response to this fault detection signal is sent to control circuit (43); And precharge driver circuit (47), be used for storage capacitance is carried out pre-charge, and in response to receiving fault detection signal and enable this precharge driver circuit (47) by control circuit from failure detector circuit (33), wherein when being activated, this precharge driver circuit (47) attempts storage capacitance (35) is precharged to a voltage level, and this voltage level enough is used for this at least one switch switched and can damage this at least one switch so that continues to operate.
2, protective circuit as claimed in claim 1; wherein failure detector circuit (33) resides in the floating part of floating power transfer device; and control circuit (43) resides in the ground connection reference section of floating power transfer device; and wherein this protective circuit also comprises unsteady level shifter (34); be used for fault detection signal is transferred to the ground connection reference section from the floating part of floating power transfer device, it is transferred to control circuit (43).
3, protective circuit as claimed in claim 1; wherein failure detector circuit (33) also comprises such circuit; this circuit is used for directly or indirectly monitoring when the voltage at the storage capacitance two ends of floating power transfer device drops to below the fault threshold, and is used in response to this this fault detection signal being sent to control circuit.
4, protective circuit as claimed in claim 1; wherein floating power transfer device also comprises the power supply with the voltage level in 5 to 20 volt range; when this at least one switch (36,37) was connected, this power supply charged to the storage capacitance of floating power transfer device.
5, protective circuit as claimed in claim 4, wherein said at least one switch comprise two switches (36,37) of operate in tandem, are used for periodically applying supply voltage at storage capacitance (35) two ends, so that this electric capacity is charged.
6, protective circuit as claimed in claim 1; also comprise temperature sensor; when the temperature that is used to detect this at least one switch is elevated on the temperature levels of setting; and be used for a too high signal of temperature being sent to control circuit in response to this; and wherein control circuit also comprises such device, and this device is used for the Temporarily Closed floating power transfer device and restarts a starting sequence in response to receiving the too high signal of this temperature subsequently.
7, a kind of equipment comprises: storage capacitance (35) applies load to its two ends during use; Supply voltage is used for storage capacitance (35) is charged; Be coupling at least one switch (36,37) between this supply voltage and the storage capacitance (35), be used for optionally supply voltage being connected to storage capacitance (35) or disconnect from storage capacitance (35); And the protective circuit that is used for this at least one switch, this this protective circuit comprises: control circuit (43) is used to control the switching of at least one switch (36,37) of this equipment; Failure detector circuit (33) is used for detecting the fault at least one of this equipment and this load, and in response to this fault detection signal is sent to control circuit (43); And precharge driver circuit (47), be used for storage capacitance (35) is carried out pre-charge, and by this control circuit (43) in response to receiving this fault detection signal and enable this precharge driver circuit (47) from failure detector circuit (33), and wherein when being activated, this precharge driver circuit (47) attempts storage capacitance (35) is precharged to a voltage level, and this voltage level enough is used for this at least one switch (36,37) switched and can damage this at least one switch (36,37) so that continues to operate.
8, equipment as claimed in claim 7; wherein failure detector circuit (33) resides in the floating part of floating power transfer device; and control circuit (43) resides in the ground connection reference section of floating power transfer device; and wherein protective circuit also comprises unsteady level shifter; be used for fault detection signal is transferred to the ground connection reference section from the floating part of floating power transfer device, it is transferred to control circuit (43).
9, equipment as claimed in claim 7, failure detector circuit wherein (33) also comprises such circuit, this circuit is used for directly or indirectly monitoring when the voltage at storage capacitance (35) two ends drops to below the fault threshold, and is used in response to this this fault detection signal being sent to control circuit (43).
10, equipment as claimed in claim 7, wherein power supply (49) has about 5 volts of voltage levels that arrive in about 20 volt range, and when described at least one switch (36,37) was connected, this power supply charged to storage capacitance (35).
11, equipment as claimed in claim 10, wherein said at least one switch comprise two switches (36,37) of operate in tandem, are used for periodically applying supply voltage so that this electric capacity is charged at storage capacitance (35) two ends.
12, equipment as claimed in claim 7; wherein protective circuit also comprises temperature sensor; when the temperature that is used to detect described at least one switch is elevated on the temperature levels of setting; and be used for a too high signal of temperature being sent to control circuit in response to this; and wherein control circuit also comprises such device, and this device is used for the Temporarily Closed floating power transfer device and restarts a starting sequence in response to the too high signal of this temperature subsequently.
13, a kind of method comprises: control the switching of at least one switch (36,37), this at least one switch control is to the charging of the storage capacitance (35) of the floating power transfer device that applies load (50) at its two ends when using; Monitor in floating power equipment and the load (50) at least one with detection failure, and generate fault detection signal based on fault detect; And attempt storage capacitance (35) is precharged to a voltage level in response to the generation of fault detection signal, this voltage level enough is used for this at least one switch (36,37) switched and can damage this at least one switch so that continue operation.
14, method as claimed in claim 13, wherein carry out this control from the ground connection reference section of floating power transfer device, and carry out this supervision from the floating part of floating power transfer device, and wherein this method comprises that also the level that the fault detection signal that is generated is carried out from floating part to the ground connection reference section shifts, and begins storage capacitance is carried out precharge trial being used to.
15, method as claimed in claim 13, wherein said supervision comprise when the voltage at direct or indirect supervision storage capacitance (35) two ends drops to below the fault threshold, and are used for generating in response to this fault detection signal.
16, method as claimed in claim 13, wherein come storage capacitance (35) to charge to floating power transfer device from a power supply, this power supply has the voltage level in 5 to 20 volt range, wherein when described at least one switch connection, this power supply (49) charges to the storage capacitance of floating power transfer device.
17, method as claimed in claim 16, wherein said at least one switch comprise two switches (36,37) of operate in tandem, are used for periodically applying supply voltage so that this electric capacity is charged at storage capacitance (35) two ends.
18, method as claimed in claim 13, also comprise the temperature of described at least one switch (36,37) is monitored, and when the temperature of this at least one switch (36,37) is elevated on the temperature levels of setting, generate the too high signal of temperature, and wherein this method also comprises the Temporarily Closed floating power transfer device and restarts a starting sequence in response to the too high signal of this temperature subsequently.
19, a kind of circuit, comprise: be used to control the device for switching of at least one switch (36,37), this at least one switch (36,37) control is to the charging of the storage capacitance (35) of the floating power transfer device that applies a load (50) at its two ends when using; At least one that is used for monitoring floating power transfer device and this load is with detection failure and generate the device of fault detection signal based on fault detect; And the device that is used for attempting storage capacitance (35) is precharged in response to the generation of fault detection signal a voltage level, this voltage level enough is used for this at least one switch switched and can damage this at least one switch so that continue operation.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US42763302P | 2002-11-18 | 2002-11-18 | |
| US60/427,633 | 2002-11-18 | ||
| US10/607,749 | 2003-06-27 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1711671A true CN1711671A (en) | 2005-12-21 |
| CN100401626C CN100401626C (en) | 2008-07-09 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2003801034880A Expired - Fee Related CN100401626C (en) | 2002-11-18 | 2003-11-15 | Protection circuit and method for floating power transfer device |
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| Country | Link |
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| CN (1) | CN100401626C (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102957127A (en) * | 2011-08-18 | 2013-03-06 | 英飞凌科技奥地利有限公司 | Communication line driver protection circuitry, systems and methods |
| CN101770801B (en) * | 2008-12-26 | 2013-03-13 | 海力士半导体有限公司 | Power distributor, integrated circuit and semiconductor device having the same |
| CN111670369A (en) * | 2017-11-02 | 2020-09-15 | 英诺泰克公司 | LED lamp fault detection circuit and method |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2193392A (en) * | 1986-08-02 | 1988-02-03 | Plessey Co Plc | Efficiency enhanced voltage multiplier |
| DE19928309C2 (en) * | 1999-06-21 | 2002-03-28 | Texas Instruments Deutschland | DC converter |
| US6556067B2 (en) * | 2000-06-13 | 2003-04-29 | Linfinity Microelectronics | Charge pump regulator with load current control |
| DE10045693A1 (en) * | 2000-09-15 | 2002-04-04 | Infineon Technologies Ag | Charge pump circuit |
-
2003
- 2003-11-15 CN CNB2003801034880A patent/CN100401626C/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101770801B (en) * | 2008-12-26 | 2013-03-13 | 海力士半导体有限公司 | Power distributor, integrated circuit and semiconductor device having the same |
| US8890490B2 (en) | 2008-12-26 | 2014-11-18 | Hynix Semiconductor Inc. | Power distributor and semiconductor device having the same |
| CN102957127A (en) * | 2011-08-18 | 2013-03-06 | 英飞凌科技奥地利有限公司 | Communication line driver protection circuitry, systems and methods |
| CN102957127B (en) * | 2011-08-18 | 2015-12-09 | 英飞凌科技奥地利有限公司 | Communication line drivers protective circuit, system and method |
| US9466979B2 (en) | 2011-08-18 | 2016-10-11 | Infineon Technologies Ag | Communication line driver protection circuitry, systems and methods |
| CN111670369A (en) * | 2017-11-02 | 2020-09-15 | 英诺泰克公司 | LED lamp fault detection circuit and method |
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| Publication number | Publication date |
|---|---|
| CN100401626C (en) | 2008-07-09 |
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