CN207039939U - Detection circuit and LED lamp tube for LED lamp tube - Google Patents
Detection circuit and LED lamp tube for LED lamp tube Download PDFInfo
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- CN207039939U CN207039939U CN201720490492.6U CN201720490492U CN207039939U CN 207039939 U CN207039939 U CN 207039939U CN 201720490492 U CN201720490492 U CN 201720490492U CN 207039939 U CN207039939 U CN 207039939U
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- 238000001514 detection method Methods 0.000 title claims abstract description 72
- 239000003990 capacitor Substances 0.000 claims description 75
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- 238000010586 diagram Methods 0.000 description 18
- 230000015556 catabolic process Effects 0.000 description 10
- 238000007689 inspection Methods 0.000 description 7
- 230000002441 reversible effect Effects 0.000 description 7
- 238000000034 method Methods 0.000 description 6
- 230000036961 partial effect Effects 0.000 description 6
- 230000006870 function Effects 0.000 description 4
- 206010014357 Electric shock Diseases 0.000 description 3
- 238000012544 monitoring process Methods 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 230000001629 suppression Effects 0.000 description 3
- 230000009471 action Effects 0.000 description 2
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- 230000002045 lasting effect Effects 0.000 description 2
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- 238000012360 testing method Methods 0.000 description 2
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
- Y02B20/30—Semiconductor lamps, e.g. solid state lamps [SSL] light emitting diodes [LED] or organic LED [OLED]
Abstract
This disclosure relates to a kind of detection circuit and LED lamp tube for LED lamp tube.The detection circuit includes：Impedance, voltage detector, voltage threshold circuit and the first control circuit being connected between lamp tube ends.Voltage detector is arranged to detect the voltage in impedance.Voltage threshold circuit is configured to provide for voltage threshold.First control circuit is arranged to voltage and the voltage threshold between lamp tube ends described in comparison, and control voltage detector is detected when the voltage only between the lamp tube ends is less than voltage threshold.By using the detection circuit according to the disclosure, human contact's fluorescent tube can be detected whether under guard mode, so as to avoid the risk of human electric shock.
Description
Technical field
Embodiment of the disclosure is related to lighting field, more specifically, is related in light emitting diode (LED) fluorescent tube and LED
Detection circuit in fluorescent tube.
Background technology
LED lamp tube can have and have been widely used, such as read required light etc. for room illumination, offer.LED lamp tube
It is typically mounted on the socket of adaptation.The socket is typically connected to line voltage, such as 220V AC voltage.When installation or change
During LED lamp tube, finger contact LED lamp tube base and the risk therefore got an electric shock be present.
CN202059618U provides a kind of circuit for being used to detect people's Touching controlling lamp pipe end.
Utility model content
In the prior art, detect whether that someone touches fluorescent tube terminal simply by impedance partial pressure, shortcoming is
Such as the amplitude range of 220 volts of civil powers is that prior art is possible to be examined in civil power higher pressure from zero volt to 310 volts
Survey, therefore the voltage that partial pressure obtains on human body may also be in high value, therefore it is dangerous to human body.For it is above-mentioned and other
Possible potential problems, the technical scheme of the disclosure provide a kind of detection circuit for LED lamp tube and use the detection
The LED lamp tube of circuit.
According to an aspect of this disclosure, by a kind of detection circuit for fluorescent tube, including：Be connected to lamp tube ends it
Between impedance；Voltage detector, it is arranged to detect the voltage in the impedance；Voltage threshold circuit, it is arranged to carry
Voltage supplied threshold value；First control circuit, it is arranged to compare the voltage and voltage threshold between lamp tube ends, and only in lamp
Voltage detector is controlled to be detected when voltage between pipe both ends is less than voltage threshold.
The input voltage that the advantages of this aspect is to limit when being detected will not be too high, therefore has preferably ensured people
Body safety.
In certain embodiments, voltage threshold is not higher than 30 volts.
This embodiment offers the specific scope of the voltage detected, voltage is relatively low, has preferably ensured human-body safety.
In certain embodiments, detection circuit also includes second control circuit, is arranged in voltage threshold circuit quilt
After charging reaches startup voltage, voltage detector is enabled.
This embodiment offers a kind of trigger mechanism to enable voltage detector, avoids the lasting work of voltage detector
Make, reduce the detection electric current that human body is applied in the unit interval, preferably ensured human-body safety.
The first control circuit is configured as the voltage between the input of fluorescent tube described in comparison and is used as the voltage
The startup voltage of threshold value, and the voltage only between the input of the fluorescent tube be less than it is described startup voltage when control institute
Voltage detector is stated to be detected.
The embodiment realizes two purposes using voltage is started：The threshold of low pressure detection, and intermittent triggering low pressure
The trigger mechanism of detection, realize that cost is relatively low with the circuit structure simplified.
In certain embodiments, voltage threshold circuit includes the first capacitor, and detection circuit includes the first charge circuit, the
One charge circuit is configured to charge to the first capacitor.
The embodiment produces startup voltage using capacitor, and cost is relatively low.
In certain embodiments, the first charge circuit is configured to reach capacitor initial charge and started needed for voltage
Time is：When input voltage is 230 volts, 90 milliseconds；Extremely when input voltage is 90 volts, 260 milliseconds.
In certain embodiments, detection circuit includes the first discharge loop.First discharge loop is configured to examine in voltage
Device is surveyed to start after detecting to the first capacitor discharge.
In certain embodiments, the first discharge loop is configured to the first capacitor discharge to less than needed for startup voltage
Time be less than 1 millisecond.The capacitor that first charge circuit is configured to be discharged, which charges with reaching again, to be started needed for voltage
Time range be input voltage be 230 volts when, 50 milliseconds；Extremely, when input voltage is 90 volts, 200 milliseconds.
The embodiment limits the specific cycle detected, and is detected with the longer cycle, reduces and flow through people
The detection electric current of body.
In certain embodiments, detection circuit also includes timing circuit.Timing circuit is configured to make before regularly expiring
The energy voltage threshold circuit and the first control circuit, and the enabled voltage threshold electricity is removed after the timing expires
Road and the first control circuit.
The embodiment limits detection circuit and is in the total time length of detection state, the testing number in total time length
After secondary, detection circuit will not continue to detect, and it is locked in other words will to detect circuit, avoids and continues ceaselessly to detect to human body
Caused drain circuit, reduce the harm to human body.
In certain embodiments, timing circuit include the second capacitor, be configured to the second capacitor charging second
Charge circuit and voltage limits element.The timing circuit is configured to only when the voltage on the second capacitor is less than voltage
During limit value element, the voltage threshold circuit and the first control circuit are enabled.
The embodiment carries out timing using capacitor to the total time length in detection state, implements and compares
Simplicity, cost are relatively low.
In certain embodiments, timing range is 275 milliseconds when input voltage is 230 volts；Extremely, it is in input voltage
At 90 volts, 800 milliseconds.
The embodiment specifically defines the total time length in detection state, with reference to foregoing in different input voltages
Detection cycle, total number that detects is only 4 times or so, reduces the detection electric current for flowing through human body.
In certain embodiments, timing circuit also includes the second discharge loop.Second discharge loop is configured to detecting
To the second capacitor discharge when circuit does not access input voltage.
In the embodiment, define after will only detecting circuit power down, the total time length ability in detection state
Reset, protect human-body safety.
In certain embodiments, voltage detector be configured to detect impedance on voltage with determine whether there is fluorescent tube it
Outer impedance is connected with the impedance being connected between lamp tube ends.When voltage is higher than first threshold, it is determined that in the absence of fluorescent tube it
Outer impedance.When voltage is less than first threshold, it is determined that the impedance outside the fluorescent tube be present.
In certain embodiments, in addition to rectifier bridge, the voltage threshold circuit, the first control circuit and the resistance
It is anti-to be configured to：The output of the rectifier bridge is connected to, to receive the input voltage of full-wave rectification；Or, it is connected to the rectification
The input of bridge, to receive the input voltage of halfwave rectifier.In this embodiment, by using all-wave or the detection scheme of half-wave,
Leakage current RMS value can be reduced.
This embodiment offers application of the embodiment of the present utility model in the single-ended touch of human body is detected.
According to another aspect of the present disclosure, there is provided a kind of LED lamp tube.The LED lamp tube is included described in any above-mentioned item item
Detection circuit for fluorescent tube.LED lamp tube is used to be connected to civil power.The RMS averages of civil power are in 90V to 230V scope.
By using according to some embodiments of the present disclosure, there is provided a kind of new detection circuit for LED lamp tube.The inspection
Slowdown monitoring circuit can detect whether that someone contacts LED current supply circuits under the guard mode to people.
According to second of the present utility model aspect, the LED lamp tube including foregoing detection circuit, the LED are additionally provided
Fluorescent tube is used to be connected to civil power, in addition to LED light source and the LED driver for driving the LED light source, wherein, the inspection
Slowdown monitoring circuit is used to start the LED driver when the voltage on detecting the impedance is higher than the first threshold.Only exist
LED driver can just start during unmanned impedance, improve security.
In a further embodiment, the input of the LED lamp tube is located at the both ends of the LED lamp tube.
Present embodiment reduces the single-ended touch danger that both-end enters electric LED lamp tube well.
It is appreciated that this part is not intended as the key or key character of mark embodiment of the disclosure, also it is not intended to use
In limitation the scope of the present disclosure.The further feature of the disclosure will be easy to understand by following description.
Brief description of the drawings
By the more detailed description of some embodiments of the present disclosure in appended accompanying drawing, it is more than the disclosure and its
Its advantage, feature and target will become more apparent, wherein：
Fig. 1 is the schematic block diagram according to the circuit of the LED lamp tube of one embodiment of the disclosure；
Fig. 2 is the schematic circuit diagram of voltage threshold circuit in Fig. 1, first control circuit and an example of impedance；
Fig. 3 is the schematic circuit diagram of an example of the voltage detecting circuit in Fig. 1；
Fig. 4 is the schematic circuit diagram of an example of the timing circuit in Fig. 1；
Fig. 5 is the schematic circuit diagram of an example of the EMI circuits in Fig. 1；
Fig. 6 is the schematic block diagram according to the circuit of the LED lamp tube of another embodiment of the present disclosure；
Fig. 7 is the schematic circuit diagram of voltage threshold circuit in Fig. 6, first control circuit and an example of impedance；With
And
Fig. 8 is the schematic circuit diagram of an example of the voltage detecting circuit in Fig. 6.
In all of the figs, same or similar reference numeral represents same or similar element.
Embodiment
The principle of the disclosure is described referring now to some example embodiments.It is appreciated that these embodiments are merely for saying
It is bright and help it will be understood by those skilled in the art that with the purpose of the embodiment disclosure and describe, rather than suggest the model to the disclosure
Any restrictions enclosed.Content of this disclosure described here can in a manner of described below outside various modes implement.
As described herein, term " comprising " and its various variants are construed as open-ended term, it means that " bag
Include but be not limited to ".Term "based" is construed as " being based at least partially on ".Term " one embodiment " it is understood that
For " at least one embodiment ".Term " another embodiment " is construed as " at least one other embodiment ".
In general, some embodiments of the present disclosure are related to the detection circuit for providing and being used in LED lamp tube.Detection electricity
Road detects whether that someone contacts current supply circuit in the environment of less than human safety voltage (such as 36V), so that user keeps away
Exempt from electric shock risk.According to the testing result of detection circuit, LED drive circuit may determine whether to drive LED.
Fig. 1 shows the block diagram of the circuit 100 of the LED lamp tube of one embodiment according to the disclosure.Circuit 100 includes whole
Current circuit 110, EMI suppression circuits 170, voltage threshold circuit 142, first control circuit 144, impedance R5, timing circuit 130,
Voltage detecting circuit 150, drive circuit 160 and LED180.In one embodiment of the disclosure, detection circuit is included below
Voltage threshold circuit 142, first control circuit 144, impedance R5, timing circuit 130 and the voltage detecting circuit of middle specific descriptions
150.When LED lamp tube is powered, the alternating current that mains ac power supply AC is provided is rectified the rectification of circuit 110.Mains electricity
Press AC root mean square (RMS) value can be between 90V and 230V, such as can be 220V.Rectified DC voltage VBUSCarried
Supply EMI suppression circuits 170, timing circuit 130, voltage threshold circuit 142, first control circuit 144, impedance R5 and voltage inspection
Slowdown monitoring circuit 150.Detecting electric circuit inspection, whether someone contacts current supply circuit.In the case of someone contacts current supply circuit, equivalent to
Impedance 120 is accessed between rectification circuit 110 and alternating current source AC.In the case of unmanned contact current supply circuit, in rectification circuit
Do not have impedance 120 between 110 and alternating current source AC.
Impedance R5 can carry out partial pressure with human body impedance 120 that may be present, detect on electric circuit inspection detection impedance R5
Voltage swing and produce detection signal VSENSE.Voltage detecting circuit 150 detects voltage VSENSE, and produce signal VENSelectivity
Ground enables drive circuit 160, so as to optionally drive LED 180.For example, work as VSENSEWhen signal is for example higher than threshold voltage,
This represents that all civil powers are applied in detection impedance, no human contact's LED lamp tube current supply circuit, then drive circuit 160 can be with
Drive LED 180.On the contrary, work as VSENSEWhen signal is for example not higher than threshold voltage, this expression there may be human contact's LED lamp tube
Current supply circuit, only part civil power are applied in detection impedance, then drive circuit 180 is gone to enable, so as to which LED 180 is not driven
It is dynamic.It is appreciated that drive circuit 160 is known in the art, therefore no longer drive circuit is repeated herein.It can use
Any suitable drive circuit for being used to drive LED 180 of present or future research and development.
Especially, voltage threshold circuit 142, first control circuit 144, impedance R5 and voltage detecting circuit 150 only exist
Operated when input voltage is relatively low.
Fig. 2 shows that voltage threshold circuit 142 in Fig. 1, first control circuit 144, an impedance R5 example are shown
Meaning circuit diagram.In the figure 2 example, voltage threshold circuit 142 can include capacitor C1.First control circuit 144 can wrap
Include transistor Q2 and Q3.Impedance R5 is connected to input voltage V via transistor Q1BUSBetween Power Groud PGND.
Rectified VBUSCapacitor C1 is charged via resistor R1, diode D1.Voltage on capacitor C1 by
This is gradually increasing.When the voltage on capacitor C1 reaches Zener diode Z1 breakdown reverse voltage, current flows through resistor
R7.Thus voltage on resistor R7 is gradually increasing.
First control circuit includes transistor Q2 and Q3.Second control circuit includes transistor Q4.When on resistor R7
When voltage reaches certain value, transistor Q4 is switched on.Now VBUSStill greater than the voltage on capacitor C1, VBUSContinue to capacitor
C1 is charged, and the voltage on capacitor C1 consequently reaches peak value, such as 30V.With VBUSDecline, VBUSThe electric current provided is not
It is enough to consume for resistor R7 and resistor R6.Now, breakdown potential of the voltage on capacitor C1 still greater than Zener diode Z1
The conducting voltage of pressure and transistor Q4, therefore continue to Q4 and turn on and power.Thus voltage on capacitor C1 declines.
Zener diode Z1, capacitor C1 and resistor R1 can be configured so that C1 reaches the pole of Zener two by initial charge
Time needed for the voltage (that is, starting voltage) of pipe Z1 reverse breakdowns is between 90ms and 260ms.Furthermore, it is possible to the electricity in Fig. 2
Road is arranged so that during aforesaid operations process, is less than human-body safety electric current by the electric current of rectifier 110, such as less than
10mA.It is appreciated that the above is only example, Zener diode, capacitor and resistor can be taken other form to realize electricity
Resistance, electric capacity and the function of being turned on threshold value.For example, resistor R1 can be formed by multiple resistor in series.
With the decline of input voltage, VBUSGradually reduce, voltage on the capacitor cl is more than VBUSWhen, such as in electric capacity
Voltage on device C1 is more than VBUSDuring with transistor Q2 and Q3 conducting voltage (Veb) sum, transistor Q2 and Q3 will be turned on, after
And transistor Q1 will be turned on.Now, capacitor C1 will be discharged.Capacitor C1 has two discharge loops.Capacitor C1 can be with
Discharge via resistor R4, transistor Q3 and Q4, and be also discharged via transistor Q2, resistor R2 and transistor Q1.
When transistor Q1 is turned on, detection starts, and electric current flows through resistor R5 and human body impedance that may be present, so as to
Detection voltage V is formed on resistor R5SENSE.When human contact's current supply circuit, resistor R5 hinders with human body that may be present
Anti- 120 form bleeder circuit.In one example, resistor R5 is much smaller than human body impedance, therefore VSENSEIt is minimum, such as be only
1V.Comparatively, when no human contact's current supply circuit, due to no partial pressure of impedance 120, VSENSEIt is higher, for example, 25V.
Drive circuit 160 can have voltage detector to detect VSENSE.Work as VSENSEWhen (such as 1V) is not higher than threshold value (such as 10V),
Drive circuit 160 does not drive LED 180, and works as VSENSEWhen (such as 25V) is higher than threshold value (such as 10V), drive circuit 160 does not drive
Dynamic LED 180.
During electric discharge, the breakdown reverse voltage of voltage on the capacitor cl less than Zener diode Z1 and transistor
During base emitter voltage (Vbe) sum, Q2 is still conducting.Electric current is by resistor R3 inflow transistor Q4, so as to remain brilliant
Body pipe Q4 is turned on.When the voltage on capacitor C1 is less than VBUSWhen, transistor Q3 cut-offs, transistor Q2 and Q4 then end.This
When, the voltage (that is, starting voltage) of voltage on C1 less than Zener diode Z1 reverse breakdowns.Resistor R2 and R4 and crystal
Pipe Q1-Q4 is configured to the first capacitor discharge to the time being less than needed for startup voltage being less than 1 millisecond.Due to discharging herein
During, whole circuit only operates under less than the threshold value of human safety voltage (such as 30V), therefore can protect human body from
Electric shock risk.
After this, can be detected next time, VBUSCapacitor C1 is charged again in the new cycle, weight
Multiple said process.It is appreciated that because capacitor C1 is not completely discharged in first time discharge process, therefore in follow-up week
Interim charging not starts to charge up as first time charging from 0V, but is filled since low magnitude of voltage (such as 7V)
Electricity.This causes during subsequent charge, be charged to start voltage needed for time (such as 50ms) be less than for the first time be charged to
Start the time (such as 200ms) needed for voltage.It is appreciated that subsequent charge to start voltage needed for actually can be in 50ms
Selected between 200ms.It is appreciated that the schematic circuit diagram in Fig. 2 is only example.Other analogous circuits can be used to perform phase
As function.
Fig. 3 shows the schematic circuit diagram of an example of the voltage detecting circuit in Fig. 1.Voltage detecting circuit 150 wraps
Include capacitor C31-32, resistor R31-R33 and Zener diode Z30.Voltage detecting circuit 150 is configured to reaching startup
Voltage on voltage (such as 30V) detection impedance R5.
As shown in figure 3, when impedance R5 exports V in the case of no human contact's current supply circuitSENSEWhen (such as 25V),
Capacitor C31 in voltage detecting circuit 150 is to VSENSEIt is filtered.The voltage capacitor C32 filtered is charged.
After capacitor C1 electric discharges, charge the reverse breakdown for make it that the voltage on capacitor C32 reaches Zener diode Z30 in multiple cycles
Voltage.After Zener diode Z30 reverse breakdowns, electric current flows through resistor R33 to produce voltage on resistor R33.Crystal
Pipe Q30 is then turned on, and by transistor Q31 base voltage with being pulled down to power supply PGND.Therefore transistor Q31 is not turned on,
VENOutput HIGH voltage.
On the contrary, when human contact's current supply circuit, due to VSENSERelatively low (such as 1V), the charging electricity on capacitor C32
Pressure does not reach Zener diode Z30 breakdown reverse voltage, therefore transistor Q30 cut-offs and transistor Q31 conductings, by VENUnder
With being pulled to power supply PGND.Drive circuit 160 can be according to VENMagnitude of voltage enabled to be enabled or go.Voltage detecting circuit
Thus 150 detect the voltage in impedance, with determine whether there is impedance outside the fluorescent tube and be connected to lamp tube ends it
Between impedance be connected.Determine that the impedance outside the fluorescent tube is not present when voltage is higher than first threshold, and when voltage is less than
During the first threshold, it is determined that the impedance outside the fluorescent tube be present.
It is worth noting that, the voltage ratio can more also be realized by other embodiment, such as integrated operational amplifier.
On the basis of foregoing intermittent detection, the number of intermittent detection can also be further limited, this can lead to
Cross and limit realizing total time for detection, the timing circuit 130 in Fig. 1 is provided to realize this function.
Fig. 4 shows the schematic circuit diagram of an example of the timing circuit 130 in Fig. 1.Timing circuit includes resistor
R10-R15, diode D10, capacitor C10, Zener diode Z10 and transistor Q10.Timing circuit is configured to be timed to
The voltage threshold circuit and the first control circuit were enabled before phase, and the enabled voltage threshold is removed after regularly expiring
Circuit and the first control circuit.
As rectified input voltage VBUSWhen being input to timing circuit 130, capacitor C10 is electrically charged.Work as capacitor
Before C10 is not filled, Zener diode Z10 is not reversed breakdown, therefore transistor Q10 is not turned on.Zener diode Z10 exists
This is operated as voltage limiting element.Now, the capacitor C1 in voltage threshold circuit 142 discharges not via transistor Q10.
When capacitor C10 is filled and (regularly expired), Zener diode Z10 is reversed breakdown, therefore transistor Q10
Conducting.Capacitor C1 in voltage threshold circuit 142 is via transistor Q10 repid discharges, and therefore capacitor C1 is short-circuited.
After capacitor C1 is short-circuited, voltage threshold circuit 142, first control circuit 144, impedance R5 and voltage detecting circuit 150
Also then it is stopped.As long as the voltage persistently existed on AC power AC, C10 will persistently be present so that capacitor C1 can not
It is electrically charged and reaches startup voltage, therefore voltage threshold circuit 142, first control circuit 144, impedance R5 and voltage detecting circuit
150 will not will work always.
It is appreciated that timing circuit is arranged so that the scope of timing is 275 milliseconds to 800 milliseconds, so as to allow electricity
Pressure detection electric circuit inspection 3-4 times.Thus, can be in LED180 normal works so that voltage threshold circuit 142, first
Control circuit 144, impedance R5 and voltage detecting circuit 150 are disabled, so as to reduce power consumption.
When power is off, such as when LED lamp tube and AC power AC disconnections, the electric energy stored on capacitor C10 passes through bag
Transistor D10 and resistor R13 the second discharge loop repid discharge is included, such as discharges and completes in 400ms.
Fig. 5 shows the schematic diagram of an example of electromagnetic interference (EMI) suppression circuit 170 in Fig. 1.EMI suppresses electricity
Road 170 includes diode D20, capacitor C20 and C21, inductor L20 and resistor R20, and is arranged to suppress EMI.
In addition, after having human body access circuit, drive circuit 160 is stopped, and due to diode D20 presence, capacitor C20
To there is no discharge loop with C21.Thus, entirely detection circuit is equivalent to a purely resistive circuit, input current and reality
Border consumption electric current is therefore basically identical, and power factor (PF) value is close to 1.
Comparatively, if not having diode D20, the whole circuit that detects is equivalent to resistance-capacitance circuit, therefore PF values will
It is very low, and input effective current and will be greater than actual consumption electric current.For the angle of circuit, no matter either with or without diode D20,
Actual consumption electric current is just as, but the leakage current for flowing through human body is input effective current.Therefore, if without diode
D20, then flowing through the leakage current of human body will increase.
Fig. 6 shows the block diagram of the circuit 100 according to the LED lamp tube of another embodiment of the present disclosure.Circuit 100 includes whole
Current circuit 110, voltage threshold circuit 142, first control circuit 144, impedance R5, voltage detecting circuit 150, drive circuit 160
With LED 180.It is with the circuit difference shown in Fig. 1, detection circuit is directly connected to the output end of rectifier bridge 110, with
Obtain the mains ac power supply AC of halfwave rectifier.And there is no timing circuit 130, and worked always so as to detect circuit, lasting detection
Voltage in impedance, human contact's fluorescent tube can be detected whether in fluorescent tube installation process and during fluorescent tube use, from
And human-body safety is protected all the time.In the circuit in fig. 6, ac cycle 50Hz, peak point current is half-wave peak point current, so as to drop
The RMS value of low-leakage current.Mains voltage AC root mean square (RMS) value can be between 90V and 230V, such as can be
220V.In one embodiment of the disclosure, voltage threshold circuit 142 that detection circuit includes hereinafter specifically describing, the
One control circuit 144, impedance R5, timing circuit 130 and voltage detecting circuit 150.When LED lamp tube is powered, mains
The alternating current that power supply AC is provided is rectified the rectification of circuit 110.Half-wave in AC alternating currents turns into DC voltage VBUSIt is provided given
When circuit 130, voltage threshold circuit 142, first control circuit 144, impedance R5 and voltage detecting circuit 150.Detect circuit inspection
Survey whether someone contacts current supply circuit.In the case of someone contacts current supply circuit, equivalent in rectification circuit 110 and alternating current source
Impedance 120 is accessed between AC.In the case of unmanned contact current supply circuit, do not have between rectification circuit 110 and alternating current source AC
There is impedance 120.
Fig. 7 shows that voltage threshold circuit 142 in Fig. 6, first control circuit 144, an impedance R5 example are shown
Meaning circuit diagram.In the example in figure 7, voltage threshold circuit 142 can include capacitor C71.First control circuit 144 can wrap
Include transistor Q72.Impedance R5 is connected to input voltage V via transistor Q71BUSBetween Power Groud PGND.Zener diode
Z71 is by the voltage clamping on capacitor C71 so that detection circuit is in the case of human safety voltage (such as not higher than 30V)
Operation.
The V obtained through halfwave rectifierBUSBy resistor R71 and R72 partial pressure, wherein resistor R72 resistances much larger than (such as
More than 10 times) resistor R71 resistance.V through halfwave rectifierBUSVia D71 pairs of resistor R71, resistor R72 and diode
Capacitor C71 is charged.Thus voltage on capacitor C71 is gradually increasing and is maintained.And with AC alternating voltages
Reduce, the V through halfwave rectifierBUSDecline.Voltage in Q72 base stage reduces with the reduction of AC alternating voltages.Work as capacitor
Voltage on C71 rises to the voltage in the base stage more than Q72 (substantially identical with the voltage on resistor R73) and diode
During D71 pressure drop (0.7V) sum, transistor Q72 conductings.Now, the electric charge on capacitor C71 via transistor Q72 transmitting
Pole flow to transistor Q72 base stage, and then flows through resistor R72 and resistor R73.
Now, the electric current flowed out from transistor Q72 colelctor electrode is β times of (β of the electric current of outflow transistor Q72 base stage>
1).The electric current flowed out from transistor Q72 colelctor electrode then inflow transistor Q71 so that transistor Q71 is turned on, so as to electric current
Flow through resistor R5.As noted previously, as resistor R73 resistance is larger, therefore the electric charge on capacitor C71 can't be at once
It is let go.Therefore, the electric charge on capacitor C71 maintains transistor Q72 and Q71 conducting.When transistor Q71 is turned on, detection is opened
Begin, electric current flows through resistor R5 and human body impedance that may be present, so as to form detection voltage V on resistor R5SENSE.When
During human contact's current supply circuit, resistor R5 forms bleeder circuit with human body impedance 120 that may be present.In one example,
Resistor R5 is much smaller than human body impedance, therefore VSENSEIt is minimum, such as only 1V.Comparatively, when no human contact powers back
Lu Shi, due to no partial pressure of impedance 120, VSENSEIt is higher, for example, 25V.Drive circuit 160 can have voltage detector to examine
Survey VSENSE.Work as VSENSEWhen (such as 1V) is not higher than threshold value (such as 10V), drive circuit 160 does not drive LED 180, and works as VSENSE
When (such as 25V) is higher than threshold value (such as 10V), drive circuit 160 does not drive LED 180.
In Fig. 7 embodiment, due to and without discharge loop in timing circuit 130 as shown in Figure 4, therefore scheme
Detection circuit in 7 works all the time.
Fig. 8 shows the schematic circuit diagram of an example of the voltage detecting circuit in Fig. 7.Voltage detecting circuit 150 wraps
Include capacitor C81-C82, diode D81 and Zener diode Z81.Voltage detecting circuit 150 is configured to reaching startup electricity
Press the voltage on (such as 30V) detection impedance R5.
As shown in figure 8, when impedance R5 exports V in the case of no human contact's current supply circuitSENSEWhen (such as 25V),
Capacitor C81 in voltage detecting circuit 150 is to VSENSEIt is filtered.The voltage filtered charges to capacitor C82.
When C82, which is charged to, enables voltage (such as 15V) more than threshold value, drive circuit 160 receives enabled voltage VENAnd drive
LED 180。
On the contrary, when human contact's current supply circuit, due to VSENSERelatively low (such as 1V), capacitor C82 are only capable of being electrically charged
To up to 1V, the voltage enables voltage less than the threshold value of drive circuit 160.Therefore drive circuit 160 does not drive LED 180.
Zener diode Z81 is used to carry out amplitude limit to the charging voltage on capacitor C82 to protect drive circuit 160.Therefore can manage
Solution, Zener diode Z81 is optional in circuit 150 is detected.Such as when drive circuit 160 has the guarantor for input voltage
During protective function, Zener diode Z81 can be omitted.Thus voltage detecting circuit 150 detects the voltage in impedance, to determine to be
The no impedance existed outside the fluorescent tube is connected with the impedance being connected between lamp tube ends.It is true when voltage is higher than first threshold
Surely the impedance outside the fluorescent tube is not present, and when voltage is less than the first threshold, it is determined that existing outside the fluorescent tube
Impedance.
It is worth noting that, the voltage ratio can more also be realized by other embodiment, such as integrated operational amplifier.
It is appreciated that Fig. 2-Fig. 8 circuit is only example, the configuration of other circuits can be used to realize similar function.Example
Such as, in embodiment of the disclosure, the bipolar transistor in field-effect transistor alternate figures 2- Fig. 8 can be used, can be used
Resistor is connected in series the single resistor come in alternate figures 2- Fig. 8, can also being connected in parallel to substitute using capacitor
Single capacitor in Fig. 2-Fig. 8.It is appreciated that the simple transformation of the circuit and circuit element in Fig. 2-Fig. 8 is located at the disclosure
Protection domain within.
In general, the various embodiments of the disclosure can be with hardware or special circuit, software, logic or its any combination
Implement.Some aspects can be implemented with hardware, and some other aspect can be with firmware or software implementation, and the firmware or software can
With by controller, microprocessor or other computing devices.Although the various aspects of the disclosure be shown and described as block diagram,
Flow chart is represented using some other drawing, but it is understood that frame described herein, equipment, system, techniques or methods can
With in a non limiting manner with hardware, software, firmware, special circuit or logic, common hardware or controller or other calculating
Equipment or some combinations are implemented.
Although in addition, operation is described with particular order, this is understood not to require this generic operation with shown suitable
Sequence is performed or performed with generic sequence, or requires that all shown operations are performed to realize expected result.In some feelings
Under shape, multitask or parallel processing can be favourable.Similarly, begged for although the details of some specific implementations is superincumbent
By comprising but these are not necessarily to be construed as any restrictions to the scope of the present disclosure, but the description of feature is only pin in
To specific embodiment.Some features described in some embodiments of separation can also be held in combination in single embodiment
OK.Mutually oppose, the various features described in single embodiment can also in various embodiments be implemented separately or to appoint
The mode of what suitable sub-portfolio is implemented.
Although the disclosure is acted to describe with specific structural features and/or method, but it is understood that will in appended right
The disclosure limited in book is asked to be not necessarily limited to above-mentioned specific features or action.Above-mentioned specific features and action are merely disclosed as reality
Apply the exemplary forms of claim.
Claims (16)
1. a kind of detection circuit (100) for LED lamp tube, including：
The impedance (R5) being connected between the input of the fluorescent tube, and
Voltage detector, it is arranged to detect the voltage in the impedance (R5)；
Characterized in that, also including, voltage threshold circuit (142), voltage threshold is configured to provide for；
First control circuit (144), the voltage being arranged between fluorescent tube input described in comparison and the voltage threshold, and
And the voltage only between the input of the fluorescent tube controls the voltage detector to be detected when being less than the voltage threshold.
2. detection circuit (100) according to claim 1, it is characterised in that the voltage threshold is not higher than 30 volts.
3. detection circuit (100) according to claim 1, it is characterised in that also including second control circuit (Q4), by with
Put for after the voltage threshold circuit (142) is electrically charged and reaches startup voltage, enabling the voltage detector.
4. detection circuit (100) according to claim 3, it is characterised in that the first control circuit (144) is configured
Voltage between the input of the fluorescent tube and the startup voltage as the voltage threshold, and only described
Voltage between the input of fluorescent tube controls the voltage detector to be detected when being less than the startup voltage.
5. the detection circuit (100) according to claim 3 or 4, it is characterised in that voltage threshold circuit (142) bag
The first capacitor (C1) is included, the detection circuit also includes：
First charge circuit (R1), first charge circuit are configured to charge to reach to first capacitor (C1)
State startup voltage.
6. detection circuit (100) according to claim 5, it is characterised in that first charge circuit (R1) is configured
It is into the time reached the first capacitor (C1) initial charge needed for the startup voltage：
When input voltage is 230 volts, 90 milliseconds；Extremely
When input voltage is 90 volts, 260 milliseconds.
7. detection circuit (100) according to claim 6, it is characterised in that the detection circuit discharges back including first
Road (Q2, R2, Q1；R4, Q3, Q4), first discharge loop is configured to after the voltage detector starts detection to institute
State the first capacitor discharge.
8. it is according to claim 7 detection circuit (100), it is characterised in that first discharge loop be configured to by
First capacitor discharge is extremely less than the time started needed for voltage less than 1 millisecond, and
First capacitor that first charge circuit is configured to be discharged charges again reaches the startup voltage
Required time range is
When input voltage is 230 volts, 50 milliseconds；Extremely
When input voltage is 90 volts, 200 milliseconds.
9. detection circuit (100) according to claim 1, it is characterised in that described fixed also including timing circuit (130)
When circuit (130) be configured to enable the voltage threshold circuit (142) and the first control circuit before regularly expiring
(144), and after the timing expires go to enable the voltage threshold circuit (142) and the first control circuit (144).
10. detection circuit (100) according to claim 9, it is characterised in that the timing circuit (130) includes second
Capacitor (C10), be configured to second capacitor charging the second charge circuit (R10) and voltage limits element
(Z10), the timing circuit is configured to only when the voltage on second capacitor (C10) is less than the voltage limits element
(Z10) during limit value, the voltage threshold circuit (142) and the first control circuit (144) are enabled.
11. detection circuit (100) according to claim 10, it is characterised in that the scope of the timing is：
When input voltage is 230 volts, 275 milliseconds；Extremely
When input voltage is 90 volts, 800 milliseconds.
12. detection circuit (100) according to claim 10, it is characterised in that the timing circuit is also put including second
Electrical circuit (D10, R13), second discharge loop (D10, R13) are configured to not access input electricity in the circuit (100)
Second capacitor (C10) is discharged during pressure.
13. detection circuit (100) according to claim 1, it is characterised in that the voltage detector is configured to detect
The voltage in the impedance with determine whether there is the impedance outside the fluorescent tube with it is described be connected to fluorescent tube input it
Between impedance be connected, determine that the impedance outside the fluorescent tube is not present when the voltage is higher than first threshold, and when described
When voltage is less than the first threshold, it is determined that the impedance outside the fluorescent tube be present.
14. detection circuit (100) according to claim 1, it is characterised in that also including rectifier bridge (110), the voltage
Threshold circuit (142), the first control circuit (144) and the impedance (R5) are configured to：
The output of the rectifier bridge is connected to, to receive the input voltage of full-wave rectification；Or
The input of the rectifier bridge is connected to, to receive the input voltage of halfwave rectifier.
15. a kind of LED lamp tube, it is characterised in that including the detection circuit (100) for fluorescent tube described in foregoing any one, institute
LED lamp tube is stated to be used to be connected to civil power,
Also include LED light source and the LED driver for driving the LED light source,
Wherein, the detection circuit (100) is used for when the voltage on detecting the impedance (R5) is higher than the first threshold
Start the LED driver.
16. LED lamp tube according to claim 15, it is characterised in that the input of the LED lamp tube is positioned at described
The both ends of LED lamp tube.
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| CN201720490492.6U CN207039939U (en) | 2017-05-04 | 2017-05-04 | Detection circuit and LED lamp tube for LED lamp tube |
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| CN201720490492.6U CN207039939U (en) | 2017-05-04 | 2017-05-04 | Detection circuit and LED lamp tube for LED lamp tube |
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