CN209046908U - The LED emergency lamp control circuit of compound isolated form - Google Patents
The LED emergency lamp control circuit of compound isolated form Download PDFInfo
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- CN209046908U CN209046908U CN201821052013.3U CN201821052013U CN209046908U CN 209046908 U CN209046908 U CN 209046908U CN 201821052013 U CN201821052013 U CN 201821052013U CN 209046908 U CN209046908 U CN 209046908U
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Abstract
The utility model discloses a kind of LED of compound isolated form emergency lamp control circuits, belong to security protection technology field.The LED emergency lamp control circuit of compound isolated form includes the first isolation circuit, the second isolation circuit, third isolation circuit, LED module, voltage increase and current constant circuit, detection control circuit, voltage regulator circuit, battery, charge protector and switch SW etc..It include transformer T20A in first isolation circuit, transformer T20A is the transformer being electrically isolated；It include transformer T70 in second isolation circuit, transformer T70 is the transformer being electrically isolated；It include optocoupler U70, the optocoupler that optocoupler U70 is electrically isolated in third isolation circuit.It is acted on by the electric isolution of transformer T20A, transformer T70 and optocoupler U70, the LED emergency light circuit isolation of compound isolated form is become into primary and secondary.It solves in the case where meeting safety after mains failure, switchs the problem of being unable to control emergency light.
Description
Technical field
The utility model relates to field of safety protection, in particular to the LED emergency lamp control circuit of a kind of compound isolated form.
Background technique
Presently, there are the LED of two seed types emergency lamp control circuit, the circuit that the circuit of the first seed type is electrically isolated, symbol
Safety standard is closed, but the on and off of LED emergency light cannot be controlled by switch on wall in the case where mains failure；Second
The circuit of seed type is the circuit of non-electrically isolated, can control LED emergency light by switch on wall in the case where mains failure
On and off, but fail safety standards.
Utility model content
In order to solve in the prior art in the case where meeting safety, switch is unable to control emergency light after mains failure
The problem of, the utility model embodiment provides a kind of LED emergency lamp control circuit of compound isolated form.The technical solution is such as
Under:
The LED emergency lamp control circuit of the compound isolated form include first isolation circuit, the second isolation circuit,
Third isolation circuit, LED module, voltage increase and current constant circuit, detection control circuit, voltage regulator circuit, battery, charge protector and
Switch etc..It include transformer T20A etc. in first isolation circuit, transformer T20A is to be electrically isolated；The second isolation electricity
It include transformer T70 etc. in road, transformer T70 is to be electrically isolated；It include optocoupler U70 etc., optocoupler in the third isolation circuit
What U70 was electrically isolated.It is acted on by the electric isolution of the transformer T20A, transformer T70 and optocoupler U70, by compound isolated form
LED emergency light circuit isolation become primary and secondary, what primary and secondary was electrically isolated, meet related safety requirement.It is described
Primary circuit is arranged for connecting LED module, the battery in secondary for connecting alternating current, the secondary circuit.Described second
Isolation circuit is used for when primary is not attached to alternating current, provides uninterruptible power using the battery for third isolation circuit；First
When grade is not attached to alternating current, opening or disconnecting by the switch, using the transformation of the third isolation circuit, control
The working condition of emergency light.
Second isolation circuit is that electricity is isolated in the third using the battery when primary is not electrically coupled to alternating current
Road provides uninterruptible power, and the wave character of the uninterruptible power meets shape feature shown in fig. 5, the switching tube Q70
Drive waveforms meet Fig. 4 and shape feature shown in fig. 6.
Optionally, the LED emergency lamp control circuit of compound isolated form includes first isolation circuit.First isolation
Circuit includes AC current rectifying and wave filtering circuit, driving circuit, DC current rectifying and wave filtering circuit and high frequency transformer T20A etc..
The transformer T20A is to be electrically isolated, and first isolation circuit, which is electrically isolated, becomes primary and secondary, described
AC current rectifying and wave filtering circuit and the driving circuit are located at the primary of circuit, and the DC current rectifying and wave filtering circuit is located at the secondary of circuit.
The AC current rectifying and wave filtering circuit by commercial power rectification filtering become pulsating direct current VR, the driving circuit, high frequency transformer T20A and
DC current rectifying and wave filtering circuit constitutes isolation constant-current circuit, and the Rectified alternating current VR is transformed into the DC voltage and electricity of meet demand
Stream, this DC voltage that can satisfy demand and electric current are divided into 3 tunnels: VA, VB and VC.VA provides suitable perseverance for LED module
Galvanic electricity source；VB provides power supply for battery charging, also provides power supply for voltage regulator circuit；VC provides detection letter for detection control circuit
Number, also reset signal is provided for single-chip microcontroller U60.
Optionally, the LED emergency lamp control circuit of compound isolated form includes second isolation circuit.Second isolation
Circuit includes: transformer T70, switching tube Q70, diode D70, resistance R76, capacitor C71, capacitor C72, diode D71, pressure stabilizing
Pipe Z71, resistance R75 and capacitor C70.What the transformer T70 was electrically isolated, entire emergency light circuit, which is electrically isolated, becomes primary
And secondary.The switching tube Q70 and capacitor C70 is located at secondary, the diode D70, resistance R76, capacitor C71, capacitor
C72, diode D71, voltage-stabiliser tube Z71 and resistance R75 are located at primary.
Second isolation circuit provides uninterruptible power for the third isolation circuit.In the primary feelings without accessing alternating current
Under condition, the second isolation circuit is the uninterruptible power that third isolation circuit provides, and waveform meets shape feature shown in fig. 5,
Frequency be fL=0.1Hz~10Hz, wherein high level time be tH=0.1mS~100mS, low level time be tL=0.1S~
10S；The drive waveforms of the switching tube Q70 meet shown in Fig. 4 and Fig. 6, wherein higher frequency fH=20kHz~600kHz, high
Frequency continues total time tH=0.1mS~100mS, wherein Frequency fL=0.1Hz~10Hz.
Optionally, the LED emergency lamp control circuit of compound isolated form includes the third isolation circuit.The third isolation
Circuit includes: optocoupler U70, transistor Q71, transistor Q72, resistance R70, resistance R72, resistance R73, resistance R74, capacitor C73.
Third isolation circuit isolation is become primary and secondary by the optocoupler U70, light emitting diode, crystalline substance in the optocoupler U70
Body pipe Q71, transistor Q72, resistance R70, resistance R72, resistance R73, resistance R74 and capacitor C73 are located at the primary of circuit, described
Photosensitive tube in optocoupler U70 is located at the secondary of circuit.
The primary source of the third isolation circuit is provided by second isolation circuit；Whether have for incuding
Commercial power supply, and incuding the switch is closure or disconnection, and is sensed by the optocoupler U70 to export
Information (being output to the route where network SN) be transmitted to the detection control circuit and handled, realize corresponding control function
Energy.
Optionally, the LED emergency lamp control circuit of compound isolated form includes the detection control circuit.The detection control
Circuit include: single-chip microcontroller U60, transistor Q61, transistor Q50, transistor Q62, diode D61, voltage-stabiliser tube Z61, capacitor C61,
Capacitor C62, capacitor C63, resistance R50, resistance R60, resistance R61, resistance R62, resistance R63, resistance R64, resistance R65, resistance
R67 and resistance R68.The detection control circuit is in the secondary of entire circuit.
The detection control circuit is with the following functions: first, detect the letter for being output to network SN of third isolation circuit
Number；Second, whether the first isolation circuit of detection has output；Third detects the voltage of battery, controls the working condition of LED module；
4th, output voltage electric current to network PE；5th, output a control signal to network N 1；6th, output a control signal to network
EN；7th, [drive waveforms meet shown in Fig. 4 and Fig. 6, wherein higher frequency fH=20kHz on output drive signal to network PA
~600kHz, high frequency continue total time tH=0.1mS~100mS, wherein Frequency fL=0.1Hz~10Hz].
The U60 is single-chip microcontroller, is the core for detecting control circuit, is equivalent to the brain and face of people.Single-chip microcontroller
U60 has following main feature: pause and wake-up, WatchDog Timer, A/D converter, PWM function, programmable Timer/counting
Device, low-voltage reset function, etc..
Optionally, the LED emergency lamp control circuit of compound isolated form includes LED module.LED module include diode D90,
Capacitor C90, switching tube Q91 and a certain number of LED.
LED module is light source, is the major part of whole lamp.These LED can connect, can also be in parallel, it might even be possible to mixed
Close connection.The driving voltage current source of LED module is in two parts: first part is the output VA of the first isolation circuit, second
Part is voltage increase and current constant circuit output VD.Whether LED module, which works, is realized by detecting the network N 1 of control circuit, N1
LED module works when for positive voltage, and LED module does not work when N1 is 0 voltage.
Optionally, the LED emergency lamp control circuit of compound isolated form includes battery.Battery can be lithium ion battery,
It can be nickel-metal hydride battery etc..Battery is located at the secondary of circuit.Battery is provided suitably by voltage increase and current constant circuit for LED module
Voltage and current uses in the case where emergency.Battery directly provides power supply for the second isolation circuit, also passes through the steady of voltage regulator circuit
The photosensitive tube for detection control circuit and optocoupler U70 is pressed to provide the burning voltage of certain voltage (3V or so, but be not limited to).
Optionally, the LED emergency lamp control circuit of compound isolated form includes charge protector.Charge protector includes
Charge integrated circuit U30, protection integrated circuit U41, resistance R31, resistance R41, capacitor C30, capacitor C31, capacitor C41.
The charge protector is used to control the charging current and charged state of battery, prevents battery by following situations
Damage, it is ensured that its long-life and safety: it overcharges, over-discharge, output overcurrent, output short-circuit, battery reversal connection, excess temperature etc..
Optionally, the LED emergency lamp control circuit of compound isolated form includes voltage increase and current constant circuit.Voltage increase and current constant circuit includes
Integrated circuit U60, diode D50, inductance L50, resistance Rs50, capacitor C50, C52.
The voltage and current that the voltage increase and current constant circuit provides battery, it is more higher than cell voltage constant by being for conversion into
Electric current, to be suitble to LED module to work normally.The power supply of voltage increase and current constant circuit is provided by battery.The work of voltage increase and current constant circuit
It as state is controlled by detection control circuit, detects the electricity of U60 in the output PE control voltage increase and current constant circuit of control circuit
Source supply, the output EN for detecting control circuit is the control signal for enabling or deenergizing of voltage increase and current constant circuit.
Optionally, the LED emergency lamp control circuit of compound isolated form includes voltage regulator circuit.Voltage regulator circuit includes integrated circuit
U80, diode D81, voltage-stabiliser tube Z81, resistance R80, capacitor C80, C81.
Voltage regulator circuit provides the burning voltage of 3V or so for the photosensitive tube of detection control circuit and optocoupler U70.Voltage regulator circuit
Power source in the VB+ of battery and the output VB of the first isolation circuit.
Optionally, the LED emergency lamp control circuit of compound isolated form further includes T, R0 and switch.
One secondary of the city TXiang Dangyu piezoelectric transformer, internal resistance very little are equivalent to short-circuit shape when supplying in no alternating current
State (relative to third isolation circuit).
R0 is equivalent to the equivalent inpnt resistance for all electrical appliances connecting with T-phase, and generally, the resistance value very little of R0 is (opposite
In third isolation circuit).Generally R0 is in parallel with T.
Switch on wall, for controlling whole lamp.
Technical solution provided by the embodiment of the utility model has the benefit that
By the first isolation circuit of setting, the second isolation circuit, third isolation circuit and detection control circuit, meeting peace
In the case where rule, after mains failure, emergency light is controlled using switch on wall.First isolation circuit, the second isolation circuit and
Isolating device is respectively included in third isolation circuit, the LED emergency lamp control circuit of compound isolated form is electrically isolated by isolating device
As primary and secondary, primary circuit is arranged in primary, emergency light in secondary for connecting alternating current, switch setting.Second isolation
Circuit is used for when primary is not attached to alternating current, provides uninterruptible power using battery for third isolation circuit.Third isolation circuit
For incude detected whether commercial power supply, and incude detection switch on wall whether be closed, and by the optocoupler U70 come
The sensed information of output is transmitted to the detection control circuit and is handled, and realizes corresponding control function.In short, according with
In the case where closing safety, after mains failure, switch on wall still can control emergency light by third isolation circuit, solve
The problem of in the case where meeting safety switch on wall is unable to control emergency light after mains failure.
Detailed description of the invention
It, below will be to required in embodiment description in order to illustrate more clearly of the technical scheme in the embodiment of the utility model
Attached drawing to be used is briefly described, it should be apparent that, the accompanying drawings in the following description is only some realities of the utility model
Example is applied, it for those of ordinary skill in the art, without creative efforts, can also be according to these attached drawings
Obtain other attached drawings.
Fig. 1 is a kind of LED emergency lamp control circuit of compound isolated form shown in one exemplary embodiment of the utility model
Circuit diagram (circuit block diagram)；
Fig. 2 is a kind of LED emergency lamp control circuit of compound isolated form shown in one exemplary embodiment of the utility model
Circuit diagram (specific implementation circuit diagram)；
Fig. 3 is the circuit diagram for the detection control circuit that the utility model one embodiment provides；
Fig. 4 is the schematic diagram for detecting the output signal of control circuit 07；
Fig. 5 is the V diagram for the uninterruptible power that the second isolation circuit is provided to third isolation circuit；
Fig. 6 is the enlarged diagram of Fig. 4 high frequency signal, is the detail characteristic of high-frequency signal.
Specific embodiment
Term " first ", " second " are used for descriptive purposes only and cannot be understood as indicating or suggesting relative importance or hidden
Quantity containing indicated technical characteristic.The feature of " first ", " second " that limit as a result, can express or implicitly include one
A or more this feature.In the description of the present invention, unless otherwise indicated, the meaning of " plurality " is two or two
More than.
Network, is exactly the route that the port of conducting wire and interface or component connects, general current potential having the same,
Or the signal with same waveform, resistance is not present, there is no losses.With reference to Fig. 1 and Fig. 2, following network is named:
Electric power network: AC1, AC2, VB+, 3V, VA, VB, VC, VD, VR, PB,Deng；
Signal network: PA, PE, EN, N1, SN, D1, D2, D3, D4, D5 etc..
With reference to Fig. 1 and Fig. 2, primary refers to that (non-dashed frame, is identified as the partial circuit on the left of thick dashed line red in figure
' primary '), secondary refers to the partial circuit on the right side of thick dashed line red in figure (non-dashed frame is identified as ' secondary ').
With reference to Fig. 1 and Fig. 2, it illustrates the LED emergency light controls for the compound isolated form that the application one embodiment provides
The circuit diagram of circuit, wherein Fig. 1 is circuit block diagram, and Fig. 2 is specific implementation figure.As depicted in figs. 1 and 2, the compound isolation
Type LED emergency lamp control circuit include: LED module 04, voltage increase and current constant circuit 06, detection control circuit 07, voltage regulator circuit 08,
Battery 12, charge protector 05 and switch 15 etc..It include transformer T20A etc., transformer in first isolation circuit 01
T20A is to be electrically isolated；It include transformer T70 etc. in second isolation circuit 02, transformer T70 is to be electrically isolated；Described
It include optocoupler U70 etc. in three isolation circuits 03, optocoupler U70 is electrically isolated.By the transformer T20A, transformer T70 and
The electric isolution of optocoupler U70 acts on, and the LED emergency light circuit isolation of compound isolated form is become primary and secondary, primary and secondary
It is electrically isolated, meets related safety requirement.The primary circuit is for connecting alternating current, and the secondary circuit is for connecting LED
Mould group 04, the battery 12 are arranged in secondary.Second isolation circuit 02 is used for when primary is not attached to alternating current, utilizes institute
Stating battery 12 is that third isolation circuit 03 provides uninterruptible power；When primary is not attached to alternating current, pass through opening for the switch 15
Logical or disconnection, using the transformation of the third isolation circuit 03, controls the working condition of emergency light.
Second isolation circuit 02, when primary is not electrically coupled to alternating current, using the battery 12 be the third every
Uninterruptible power is provided from circuit 03, and the wave character of the uninterruptible power meets shape feature shown in fig. 5, the switch
The drive waveforms of pipe Q70 meet Fig. 4 and shape feature shown in fig. 6.The switch 15 is used to be not attached to city in the primary
When electric, the working condition of the LED module 04 is controlled by the third isolation circuit 03.
Wherein, first isolation circuit 01 includes AC current rectifying and wave filtering circuit 09, driving circuit 10, DC current rectifying and wave filtering circuit
11 and high frequency transformer T20.
The transformer T20 is to be electrically isolated, and first isolation circuit 01, which is electrically isolated, becomes primary and secondary, described
AC current rectifying and wave filtering circuit 09 and the driving circuit 10 are located at primary, and the DC current rectifying and wave filtering circuit 11 is located at secondary.The AC
Commercial power rectification filtering is become Rectified alternating current VR, the driving circuit 10, transformer T20 and DC rectification by current rectifying and wave filtering circuit 09
Filter circuit 11 constitutes isolation constant-current circuit, and the pulsafeeder VR is transformed into the DC voltage and electric current of meet demand, this
The DC voltage and electric current that kind can satisfy demand are divided into 3 tunnels: VA, VB and VC.VA is that LED module 04 provides suitable Constant Electric Current
Source；VB provides power supply for the charging of battery 12, also provides power supply for voltage regulator circuit 08；VC is that detection control circuit 07 provides detection letter
Number, also reset signal is provided for single-chip microcontroller U60.
The high frequency transformer that transformer T20 is electrically isolated, altogether there are three winding, based on two windings of T20A therein around
Group, T20B are auxiliary winding, and T20B is located at the primary of entire circuit.
AC current rectifying and wave filtering circuit 09 includes the components such as diode D10, D11, D12, D13, capacitor C10, C11, by alternating current
Rectifying and wave-filtering becomes Rectified alternating current VR.
Driving circuit 10 includes transistor Q20, integrated circuit U20, diode D20, diode D21, capacitor C20, capacitor
The auxiliary of C22, capacitor C23, resistance R21, resistance R22, resistance R23, resistance R24, resistance R26, resistance Rs21, transformer T20
Winding T20B.
U20 is single-stage, a High Power Factor, and primary-side-control exchange turns direct-current LED driving chip.The power factor of U20
Calibration function is run under critical conduction mode, is realized High Power Factor and is reduced the switching loss of power MOS pipe Q20, nothing
Light requirement coupling and secondary side sensing device can accurately modulate LED current, and U20 realizes various defencive functions, including mistake simultaneously
Stream protection, overvoltage protection, short-circuit protection and overheating protection etc., to ensure that system reliably works.
DC current rectifying and wave filtering circuit 11 includes diode D22, diode D24, diode D25, capacitor C24, capacitor C25, electricity
Hold C26, capacitor C92.DC current rectifying and wave filtering circuit 11 is all located at the secondary of entire circuit.Diode D24 and D25 share one around
Group.Diode D22 and capacitor C24, capacitor C92 constitute current rectifying and wave filtering circuit, and output voltage VA, VA are that LED module 04 provides
Suitable constant-current supply；Diode D24 and capacitor C26 constitutes current rectifying and wave filtering circuit, and output voltage VB, VB are the charging of battery 12
Power supply is provided, also provides power supply for voltage regulator circuit 08；Diode D25 and capacitor C25 constitutes current rectifying and wave filtering circuit, and output voltage is
VC, VC are that detection control circuit 07 provides detection signal, also provide reset signal for single-chip microcontroller U60.
Optionally, second isolation circuit 02 include: transformer T70, switching tube Q70, diode D70, resistance R76,
Capacitor C71, capacitor C72, diode D71, voltage-stabiliser tube Z71, resistance R75 and capacitor C70.What the transformer T70 was electrically isolated,
Entire emergency light circuit, which is electrically isolated, becomes primary and secondary.The switching tube Q70 and capacitor C70 is located at secondary, described
Diode D70, resistance R76, capacitor C71, capacitor C72, diode D71, voltage-stabiliser tube Z71 and resistance R75 are located at primary.
Second isolation circuit 02 is that the third isolation circuit 03 provides uninterruptible power.In primary without access alternating current
In the case where, second isolation circuit 02 is the uninterruptible power that third isolation circuit 03 provides, and waveform meets shown in fig. 5
Shape feature, frequency are fL=0.1Hz~10Hz, and wherein high level time is tH=0.1mS~100mS, low level time
For tL=0.1S~10S；The drive waveforms of the switching tube Q70 meet shown in Fig. 4 and Fig. 6, wherein higher frequency fH=20kHz
~600kHz, high frequency continue total time tH=0.1mS~100mS, wherein Frequency fL=0.1Hz~10Hz.
The switching tube Q70 makes second isolation circuit 02 work in high frequency state, make transformer T70 be in electric power storage and
The state of electric discharge works required energy so that the energy of battery 12 be made to be converted into third isolation circuit 03.Two pole
Pipe D70 is high-frequency rectification diode, makes the single-phase conducting of high frequency voltage electric current.The capacitor C71, capacitor C72 and resistance R76 are constituted
High frequency voltage is filtered into DC voltage by ' Π ' mode filter, and resistance R76 therein also plays a part of limiting electric current.It is described
Diode D71 is isolating diode, and the LED emergency lamp control circuit of compound isolated form is electrically isolated the alternating current of high pressure when accessing alternating current
AC provides forward bias current when not accessing alternating current for the third isolation circuit 03.The voltage-stabiliser tube Z71 is to described second
The voltage that isolation circuit 02 exports carries out pressure stabilizing, prevents the third isolation circuit 03 from damaging.The resistance R75 is described the
Two isolation circuits 02 provide required current loading.The capacitor C70 is decoupling capacitor, plays the role of a battery, avoids
Mutual interference.
Second isolation circuit 02 is that third isolation circuit 03 provides uninterruptible power, and the voltage output of this uninterruptible power is net
Network PB, and the voltage output of uninterruptible power meets shape and performance parameter shown in fig. 5.In the case where no commercial power supply,
It is necessary for third isolation circuit 03 and necessary suitable power supply is provided.The operating current of second isolation circuit 02 is very big by (one
As be mA grade), in the case where no commercial power supply, if battery last provides power supply for the second isolation circuit 02, battery
Electricity will soon be depleted.Therefore, it by detecting the control of control circuit 07, is powered off between being provided for third isolation circuit 03
Source, extend to greatest limit battery uses the time.Implementation method is: when detection control circuit 07 detects no commercial power supply
When, detection control circuit 07 driving signal as shown in Figure 4 and Figure 6 in the circuit output of network PA by switching tube Q70, becomes
The transformation of the components such as depressor T70 mentions finally in the back-lash voltage of circuit output such as Fig. 5 of network PB for third isolation circuit 03
For uninterruptible power.
Second isolation circuit 02 is actually open isolated form inverse-excitation type DC transfer circuit: by transformer T70 electricity every
From without feedback signal as open circuit (carrying out voltage stabilization with voltage-stabiliser tube Z71), the original edge voltage of transformer T70
With the opposite in phase of secondary voltage and become reverse excitation circuit.In order to guarantee that this circuit works normally, in order not to be opened as damage
Pipe Q70 is closed, this circuit must be provided with minimum current load, and resistance R75 is exactly to be arranged for the load of this minimum current.
The voltage of alternating current AC is very high, if be not isolated, be bound to the second isolation circuit 02 of damage and third isolation circuit 03.
AC1 and AC2 is the network of alternating current AC phase line, when the voltage of phase line AC1 is higher than the voltage of phase line AC2, since diode D71 is anti-
It cannot be connected, almost insulate, then voltage AC will not constitute electricity to the second isolation circuit 02 and third isolation circuit 03 partially
Pressure harm；When the voltage of phase line AC1 is lower than the voltage of phase line AC2, diode D71 does not work substantially, and electric current is from phase line
AC2 flows through resistance R70, the pole B of triode Q72 and the pole E (voltage between the pole-E of the pole B is very low, within only 1V), primary public affairs
AltogetherRectifier diode (positively biased and be connected) in AC current rectifying and wave filtering circuit arrives phase line AC1, forming circuit, such shape
At electric current, be named as I2.Because the resistance value of resistance R70 is very big, the voltage between the pole-E of the pole B is very low, so I2 very little, unlikely
In damage triode Q72.In conclusion B pole and E pole of the I2 in addition to flowing through resistance R70, triode Q72, are not passed through the second isolation
Other components of circuit 02 and third isolation circuit 03, so when the voltage of phase line AC1 is lower than the voltage of phase line AC2, it is high
The alternating current AC of pressure does not constitute damage to the second isolation circuit 02 and third isolation circuit 03.
Optionally, the third isolation circuit 03 includes: optocoupler U70, transistor Q71, transistor Q72, resistance R70, electricity
Hinder R72, resistance R73, resistance R74, capacitor C73.The third isolation circuit 03 isolation is become primary and secondary by the optocoupler U70
Grade, light emitting diode, transistor Q71, transistor Q72, resistance R70, resistance R72, resistance R73, resistance in the optocoupler U70
R74 and capacitor C73 is located at the primary of circuit, and the photosensitive tube in the optocoupler U70 is located at the secondary of circuit.
The primary source of the third isolation circuit 03 is provided by second isolation circuit 02；It is for incuding
It is no to have commercial power supply, and incuding the switch 15 is closure or disconnection, and by the optocoupler U70 to export
The information (being output to the route where network SN) sensed is transmitted to the detection control circuit 07 and is handled, and realizes corresponding
Control function.
The working condition of the third isolation circuit 03 has following four kinds of situations:
The first situation: the case where commercial power supply and switch on wall 15 are closures.In this case, detection control
Circuit 07 can detect, and will not export high-frequency driving signal at network PA, i.e. network PA is always low level, therefore second
Isolation circuit 02 will not provide uninterruptible power for third isolation circuit 03.In this case, and due to the second isolation circuit 02
The buffer action of middle diode D71 does not have power supply supply in third isolation circuit 03.Because of above-mentioned 2 kinds of reasons of such case,
The light emitting diode of optocoupler U70 is not turned on and then will not be shone, and high impedance output state, net is presented in the photosensitive tube of optocoupler U70
Network SN is low voltage signal and detected control circuit 07 detects, detection control circuit 07 just not will start battery power supply, only
Mains-supplied mode can be started, provide suitable voltage and current for LED module 04.
Second situation: commercial power supply and switch on wall 15 are the case where disconnection.In this case, detection control
Circuit 07 can detect, and high-frequency driving signal can be exported at network PA, i.e. the level of network PA meets the property of Fig. 4 and Fig. 6
Energy parameter, therefore the second isolation circuit 02 can provide uninterruptible power for third isolation circuit 03.In this case, alternating current AC is not
Power supply can be provided to the second isolation circuit 02 and third isolation circuit 03.In this case, transistor Q72 does not have forward bias
And it is in an off state, transistor Q71 is in zero offset and is also at off state.Because of above-mentioned 3 kinds of reasons of such case, light
The light emitting diode of coupling U70 is not turned on and then will not be shone, and high impedance output state, network is presented in the photosensitive tube of optocoupler U70
SN is low voltage signal and detected control circuit 07 detects, not will start battery power supply, will not start mains-supplied mould
Formula will not provide suitable voltage and current for LED module 04.
The third situation: the case where no commercial power supply and switch on wall 15 are closures.In this case, detection control
Circuit 07 processed can detect, and high-frequency driving signal, i.e. Fig. 4 and Fig. 6 that the level of network PA meets can be exported at network PA
Performance parameter, therefore the second isolation circuit 02 can provide uninterruptible power for third isolation circuit 03.In this case, crystal
The forward bias of pipe Q72 and be connected, transistor Q71 is in negatively biasing and be connected.Because of above-mentioned 3 kinds of reasons of such case,
The LEDs ON of optocoupler U70 and shine, and then optocoupler U70 photosensitive tube present Low ESR output state and be connected, net
Network SN is high voltage signal and detected control circuit 07 detects, detection control circuit 07 will start battery power supply, without
It will start mains-supplied mode, provide suitable voltage and current for LED module.
4th kind of situation: no commercial power supply and switch on wall 15 are the case where disconnection.In this case, detection control
Circuit 07 processed can detect, and high-frequency driving signal, i.e. Fig. 4 and Fig. 6 that the level of network PA meets can be exported at network PA
Performance parameter, therefore the second isolation circuit 02 can provide uninterruptible power for third isolation circuit 03.In this case, do not have
Alternating current provides power supply to the second isolation circuit 02 and third isolation circuit 03.In this case, transistor Q72 does not have forward bias
It sets, transistor Q72 is not turned on and in an off state, and transistor Q71 is not on negatively biasing and turns off.Because of this feelings
Above-mentioned 3 kinds of reasons of condition, the light emitting diode of optocoupler U70 is not turned on, will not more be shone, and then the photosensitive tube of optocoupler U70 is in
Existing high impedance output state and disconnect, network SN is low voltage signal and is detected control circuit 07 and detects, detection control electricity
Road 07 not will start battery power supply, will not start mains-supplied mode, because without providing suitable voltage electricity for LED module
Stream.
Optionally, the detection control circuit 07 includes: single-chip microcontroller U60, transistor Q61, transistor Q50, transistor
Q62, diode D61, voltage-stabiliser tube Z61, capacitor C61, capacitor C62, capacitor C63, resistance R50, resistance R60, resistance R61, resistance
R62, resistance R63, resistance R64, resistance R65, resistance R67 and resistance R68.The detection control circuit 07 is in entire circuit
It is secondary.
The detection control circuit 07 is with the following functions: first, detection third isolation circuit 03 is output to network SN
Signal (photosensitive tube of optocoupler U70 is output to the information on network SN)；Second, whether the first isolation circuit 01 of detection has output
(its information is output on network VC)；Third detects the voltage of battery 12, controls the working condition of LED module 04；4th, it is defeated
Voltage and current is to network PE [providing power supply for voltage increase and current constant circuit 06] out；5th, it outputs a control signal to network N 1[and is used to select
Select the driving voltage electric current of VA or VD as LED module 04]；6th, it outputs a control signal to network EN[and is used to control liter
Whether pressure constant-current circuit 06 works]；7th, output drive signal [i.e. Fig. 4 and driving signal shown in fig. 6, by switching tube
The transformation such as Q70, transformer T70, finally in the back-lash voltage of circuit output such as Fig. 5 of network PB, provides for third isolation circuit
Uninterruptible power.Drive waveforms meet shown in Fig. 4 and Fig. 6, wherein higher frequency fH=20kHz~600kHz, when high frequency continues total
Between tH=0.1mS~100mS, wherein Frequency fL=0.1Hz~10Hz] on network PA.
The U60 is single-chip microcontroller, is the core of the detection control circuit 07, is equivalent to the brain and face of people.
Single-chip microcontroller U60 has following main feature: pause and wake-up, WatchDog Timer, A/D converter, PWM function, it is fixed to may be programmed
When/counter, low-voltage reset function, etc..The used pin of single-chip microcontroller U60 and its used function are as follows:
1st foot is the pin for supplying power supply, and the 8th foot is common pin
2nd foot outputs signals to network D3.When output signal is high voltage, network D3 is high voltage, and transistor Q61 is just
It is connected to biasing, network N 1 is low-voltage, and transistor Q50 is negatively biasing and is connected, and network PE is high voltage, and network PE is to rise
Constant-current circuit 06 is pressed to provide power supply；When output signal be low-voltage when, network D3 be low-voltage, transistor Q61 do not bias and
It is not turned on, network N 1 is high voltage, and transistor Q50 is not negatively biasing and is not turned on, and network PE is low-voltage, and network PE is not
Voltage increase and current constant circuit 06 provides power supply.In the case that network PE is high voltage, because the voltage of network PE is actually approximately equal to electricity
(transistor Q50 conducting exports internal resistance very little to the voltage in pond 12, and the D-S of transistor Q50 is extremely quite short-circuit, the S of metal-oxide-semiconductor Q50
Pole is connected with the positive VB+ of battery again), so passing through bleeder circuit (bleeder circuit of resistance R60 and resistance R61 composition)
The filtering (filtering out interference) of partial pressure and capacitor C63 reflects the voltage of battery 12 onto network D2, to detect battery 12
Voltage.
Whether the 3rd foot is the signal input pin of network SN, for checking following state: having alternating current AC input to the first isolation
In circuit 01, whether switch on wall 15 is closed.
When there is an alternating current, and when switch 15 is closed, just output voltage VC, VC pass through resistance R67 and R68 to the first isolation circuit 01
Partial pressure and zener diode Z61 pressure stabilizing are formed voltage D1 (indicating this voltage D1 with network D1), and voltage D1 makes diode
D61 positively biased and be connected, voltage D1 is just added on network SN.Such situation, single-chip microcontroller U60 just complete to reset, program from
Head starts, will not on output drive signal [i.e. Fig. 4 and driving signal shown in fig. 6] to network PA, and then will not for third every
Uninterruptible power is provided from circuit 03, high impedance will be presented in the photosensitive tube of optocoupler U70, and the signal on network SN is exactly high voltage
VC；Therefore the information of the 3rd foot input is that have alternating current AC input and the closure of switch 15.
When there is an alternating current, and when switch 15 disconnects, the voltage on VC becomes low-voltage, the voltage on network D1 be also it is low, two
Pole pipe D61 negative bias and be not turned on, the signal on network SN also switchs to low-voltage by high voltage, in this conversion process and converts
In time soon afterwards, no high-frequency driving voltage on network PA, third isolation circuit 03 is also just supplied without power supply, optocoupler
High impedance will be also presented in the photosensitive tube of U70, and the signal on network SN is low-voltage, therefore the information of the 3rd foot input is that have city
Electricity input and the disconnection of switch 15.
When either with or without alternating current, and when switch 15 is closed, the voltage on network VC is 0, and the voltage on network D1 is also 0, two
Pole pipe D61 negative bias and be not turned on, network VC does not influence the signal on network SN；Such case just has high frequency on network PA
Driving voltage, third isolation circuit also just have power supply supply, due to the closure of switch 15 to which the photosensitive tube of optocoupler U70 will be led
Logical, the signal on network SN is high voltage at this time, therefore the information of the 3rd foot input is no alternating current AC input and switch 15 closes
It closes.
When either with or without alternating current, and when switch 15 disconnects, the voltage on network VC is 0, and the voltage on network D1 is also 0, two
Pole pipe D61 negative bias and be not turned on, network VC does not influence the signal on network SN；Such case just has high frequency on network PA
Driving voltage, third isolation circuit 03 also just have power supply supply, since switch 15 disconnects to which the photosensitive tube of optocoupler U70 also will
High impedance is presented and disconnects, the signal on network SN is low-voltage at this time, therefore the information of the 3rd foot input is that no alternating current AC is defeated
Enter and switch 15 disconnects.
4th foot is single-chip microcontroller U60 external reset foot.Resistance R63 and capacitor C61 is external reset resistance and capacitor.When having
Alternating current AC, and when switch 15 is just closed, point that the first isolation circuit 01 just output voltage VC, VC pass through resistance R67 and resistance R68
The clamper of pressure and zener diode Z61 is formed voltage D1 (indicating this voltage D1 with network D1), and voltage D1 passes through capacitor
The differential circuit of C62 and resistance R62 composition forms a positive pulse voltage D4 (indicating this voltage D4 with network D4), voltage
D4 forces single-chip microcontroller U60 to reset using the reversed external reset signal D5 for just forming single-chip microcontroller U60 of transistor Q62.
5th foot is the output pin of single-chip microcontroller U60, exports Fig. 4 and driving signal shown in fig. 6, wherein higher frequency fH=
20kHz~600kHz, high frequency continue total time tH=0.1mS~100mS, wherein Frequency fL=0.1Hz~10Hz.Scheme
3 and driving signal shown in fig. 5, it is converted by switching tube Q70, transformer T70 etc., finally in the circuit output of network PB as schemed
5 back-lash voltage provides uninterruptible power for third isolation circuit 03.
6th foot is the A/D conversion input pin of single-chip microcontroller U60, for checking the voltage of battery BT1, to control LED module
04 brightness in the case where battery 12 is powered is switched on or off and the working time.
7th foot is the PWM conversion output pin of single-chip microcontroller U60, for controlling LED module 04 in the case where battery 12 is powered
Brightness, be switched on or off and the working time.
Optionally, the LED module 04 includes diode D90, capacitor C90, switching tube Q91 and a certain number of LED.
LED module 04 is light source, is the major part of whole lamp.These LED can connect, can also be in parallel, it might even be possible to
Mixing connection.The driving voltage current source of LED module 04 is in two parts: first part is the output of the first isolation circuit 01
VA, second part are that voltage increase and current constant circuit 06 exports VD.LED module whether work be by detect control circuit 07 network N 1
Come what is realized, LED module works when N1 is positive voltage, and LED module does not work when N1 is 0 voltage.
Optionally, the battery 12 can be lithium ion battery, be also possible to nickel-metal hydride battery etc..Battery 12 is located at circuit
Secondary.Battery 12 is that LED module 04 provides suitable voltage and current by voltage increase and current constant circuit 06, is made in the case where emergency
With.Battery 12 directly provides power supply for the second isolation circuit 02, is also detection control circuit 07 by the pressure stabilizing of voltage regulator circuit 08
The burning voltage of certain voltage (3V or so, but be not limited to) is provided with the photosensitive tube of optocoupler U70.
Optionally, the charge protector 05 include charge integrated circuit U30, protection integrated circuit U41, resistance R31,
Resistance R41, capacitor C30, capacitor C31, capacitor C41.
The charge protector 05 is used to control the charging current and charged state of battery 12, prevents battery 12 by under
Column situation damage, it is ensured that its long-life and safety: it overcharges, over-discharge, output overcurrent, output short-circuit, battery reversal connection, excess temperature etc..
Integrated circuit U30 is a complete single lithium battery constant current constant voltage linear-charging IC, is encapsulated using SOT23-5,
With constant current constant voltage trickle charge and various defencive functions, also there is soft start function, can effectively limit dash current.It is default
4.2V charging voltage (precision 1%), trickle charge voltage are 2.9V, and trickle size is 20mA or so.
Integrated circuit U41 is encapsulated using SOT23-5, also has zero-voltage batteries charge function.
Optionally, the voltage increase and current constant circuit 06 include integrated circuit U60, diode D50, inductance L50, resistance Rs50,
Capacitor C50, capacitor C52 etc..
The voltage and current that the voltage increase and current constant circuit 06 provides battery 12, by be for conversion into than battery 12 voltage more
High constant current, to be suitble to LED module 04 to work normally.The power supply of voltage increase and current constant circuit 06 is provided by battery 12,
Transfer efficiency reaches 90%.
The working frequency of integrated circuit U60 is constant frequency 1.2MHz, therefore only needs the inductance L50 of very little, only needs very little
Filter capacitor C52；U60 is encapsulated using SOT23-6, built-in power MOS pipe；U60 has soft start and PWM dimming function；U60 tool
There are the defencive functions such as over-voltage, overcurrent, overheat；U60 also has very low cut-off current (< 1uA).
The working condition of voltage increase and current constant circuit 06 is controlled by detection control circuit 07, and the defeated of control circuit 07 is detected
PE controls the power supply supply of U60 in voltage increase and current constant circuit 06 out；The output EN for detecting control circuit 07 is voltage increase and current constant circuit 06
The enabled or control signal that deenergizes, then enable voltage increase and current constant circuit 06 when EN is high level, EN then deenergizes liter when being low level
Press constant-current circuit 06.
Optionally, voltage regulator circuit 08 include integrated circuit U80, diode D81, voltage-stabiliser tube Z81, resistance R80, capacitor C80,
C81。
Voltage regulator circuit 08 provides the stable electricity of certain (3V or so) for the photosensitive tube of detection control circuit 07 and optocoupler U70
Pressure.
The power source of voltage regulator circuit 08 is in the VB+ of battery and the output VB of the first isolation circuit.It is described when there is alternating current
First isolation circuit 01 exports VB, and VB is by resistance R80, is voltage regulator circuit 08 by voltage-stabiliser tube Z81, then by diode D81
Power supply is provided；When not having alternating current, first isolation circuit 01 is not exported VB (i.e. VB=0), diode D81 it is reverse-biased cut-off and
It is not turned on, at this moment battery 12 directly provides power supply for voltage regulator circuit 08.
Optionally, the LED emergency lamp control circuit of compound isolated form further includes T13, R014 and switch 15.
T13 is equivalent to a secondary of city's piezoelectric transformer, and internal resistance very little is equivalent to short circuit when supplying in no alternating current
State (relative to third isolation circuit).
R014 is equivalent to the equivalent inpnt resistance for all electrical appliances being connected with T13, generally, the resistance value very little of R014
(relative to third isolation circuit).Generally R014 is in parallel with T13.
Switch 15 is actually switch on wall, and for controlling whole lamp, switch 15 refers exclusively to switch on wall herein.
T13, Ro14 and switch 15 are located at the primary of the LED emergency lamp control circuit of compound isolated form.
The utility model passes through the first isolation circuit of setting, the second isolation circuit, third isolation circuit and detection control electricity
Road etc. after mains failure, controls emergency light using switch on wall in the case where meeting safety.First isolation circuit,
Respectively include isolating device in two isolation circuits and third isolation circuit, isolating device is by the LED emergency light control of compound isolated form
Circuit processed, which is electrically isolated, becomes primary and secondary, and primary circuit is arranged in primary, emergency light secondary for connecting alternating current, switch setting
Grade.Second isolation circuit is used for when primary is not attached to alternating current, provides uninterruptible power using battery for third isolation circuit.The
Three isolation circuits have detected whether commercial power supply for incuding, and incude whether detection switch on wall is closed, and pass through institute
It states optocoupler U70 and is transmitted to the detection control circuit exporting sensed information and handled, realize corresponding control function
Energy.In short, after mains failure, switch on wall still can pass through third isolation circuit control in the case where meeting safety
Emergency light processed solves the problems, such as that switch on wall is unable to control emergency light after mains failure in the case where meeting safety.
Above-mentioned the utility model embodiment serial number is for illustration only, does not represent the advantages or disadvantages of the embodiments.
Those of ordinary skill in the art will appreciate that realizing that all or part of the steps of above-described embodiment can pass through hardware
It completes, relevant hardware can also be instructed to complete by program, the program can store in a kind of computer-readable
In storage medium, storage medium mentioned above can be read-only memory, disk or CD etc..
The above is only the preferred embodiment of the present invention, is not intended to limit the utility model, all practical at this
Within novel spirit and principle, any modification, equivalent replacement, improvement and so on should be included in the guarantor of the utility model
Within the scope of shield.
Claims (8)
- The lamp control circuit 1. a kind of LED of compound isolated form meets an urgent need, which is characterized in that the LED emergency light of the compound isolated form Control circuit includes the first isolation circuit (01), the second isolation circuit (02), third isolation circuit (03), LED module (04), rises Press constant-current circuit (06), detection control circuit (07), voltage regulator circuit (08), battery (12), charge protector (05) and switch (15)；It include transformer (T20A) etc. that transformer (T20A) is to be electrically isolated in first isolation circuit (01)；Second isolation circuit It (02) include transformer (T70) etc. that transformer (T70) is to be electrically isolated in；Include in third isolation circuit (03) optocoupler (U70) Deng optocoupler (U70) is electrically isolated；Made by the electric isolution of the transformer (T20A), transformer (T70) and optocoupler (U70) With by the LED emergency light circuit isolation of compound isolated form as primary and secondary；The battery (12) is arranged in secondary；Second Isolation circuit (02) is used for when primary is not attached to alternating current, is between third isolation circuit (03) provides using the battery (12) Power-off source；When primary is not attached to alternating current, opening or disconnecting by the switch (15), using third isolation circuit (03) transformation controls the working condition of emergency light.
- The lamp control circuit 2. LED of compound isolated form according to claim 1 meets an urgent need, which is characterized in that it is described it is compound every Release LED emergency lamp control circuit includes the first isolation circuit (01)；First isolation circuit (01), alternating current AC is converted At the direct current (VA, VB and VC) of meet demand.
- The lamp control circuit 3. LED of compound isolated form according to claim 1 meets an urgent need, which is characterized in that described second every Functional character from circuit (02) is: when primary is not electrically coupled to alternating current AC, using the battery (12) be the third every Uninterruptible power is provided from circuit (03)；Second isolation circuit (02) includes: transformer (T70), switching tube (Q70), diode (D70), resistance (R76), electricity Hold (C71), capacitor (C72), diode (D71), voltage-stabiliser tube (Z71), resistance (R75) and capacitor (C70)；The transformer (T70) it is electrically isolated, entire emergency light circuit, which is electrically isolated, becomes primary and secondary；The switching tube (Q70) and capacitor (C70) it is located at secondary, it is the diode (D70), resistance (R76), capacitor (C71), capacitor (C72), diode (D71), steady Pressure pipe (Z71) and resistance (R75) are located at primary.
- The lamp control circuit 4. LED of compound isolated form according to claim 3 meets an urgent need, which is characterized in that when primary accesses When alternating current, diode (D71) reverse bias and high pressure alternating current is isolated, prevent damage circuit；When primary is without access alternating current When, diode (D71) forward bias and be connected, make the second isolation circuit (02) generate back-lash voltage electric current flow through diode (D71) uninterruptible power is provided for third isolation circuit (03).
- The lamp control circuit 5. LED of compound isolated form according to claim 1 meets an urgent need, which is characterized in that the third every Functional character from circuit (03) is: the primary source of third isolation circuit (03) is provided by the second isolation circuit (02) 's；Whether there is commercial power supply for incuding, and incude whether the switch (15) is closed, and passes through the optocoupler (U70) The detection control circuit (07) is transmitted to exporting sensed information to be handled, realizes corresponding control function；The third isolation circuit includes: optocoupler (U70), transistor (Q71), transistor (Q72), resistance (R70), resistance (R72), resistance (R73), resistance (R74), capacitor (C73), the optocoupler (U70) become third isolation circuit isolation just Grade and secondary, light emitting diode, transistor (Q71), transistor (Q72), resistance (R70), resistance in the optocoupler (U70) (R72), resistance (R73), resistance (R74) and capacitor (C73) are located at the primary of circuit, the photosensitive tube position in the optocoupler (U70) In the secondary of circuit.
- The lamp control circuit 6. LED of compound isolated form according to claim 1 meets an urgent need, which is characterized in that the detection control The functional character of circuit (07) processed is: the output information of detection third isolation circuit (03)；Detecting the first isolation circuit (01) is It is no to have output；Alternating current one is switched to the first isolation circuit (01), and single-chip microcontroller (U60) resets, from the beginning program executes；Detect the electricity The voltage in pond (12) controls the working condition of LED module (04)；On output drive signal to network PA；Output signals to network In N1, network EN and network PE, control the voltage increase and current constant circuit (06) and the LED module (04) working condition；The detection control circuit (07) include: single-chip microcontroller (U60), transistor (Q61), transistor (Q50), transistor (Q62), Diode (D61), voltage-stabiliser tube (Z61), capacitor (C61), capacitor (C62), capacitor (C63), resistance (R50), resistance (R60), electricity Hinder (R61), resistance (R62), resistance (R63), resistance (R64), resistance (R65), resistance (R67) and resistance (R68)；The detection Control circuit (07) is in the secondary of circuit.
- The lamp control circuit 7. LED of the compound isolated form according to claim 3 or 6 meets an urgent need, which is characterized in that do not have in primary In the case where having access alternating current, second isolation circuit (02) is the uninterruptible power that third isolation circuit (03) provides, frequency Rate be fL=0.1Hz~10Hz, wherein high level time be tH=0.1mS~100mS, low level time be tL=0.1S~ 10S；Detection control circuit (07) is output to the signal on network PA, and the higher frequency fH=20kHz of the signal~ 600kHz, high frequency continue total time tH=0.1mS~100mS, wherein Frequency fL=0.1Hz~10Hz.
- The lamp control circuit 8. LED of compound isolated form according to claim 1 meets an urgent need, which is characterized in that the battery position In secondary.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821052013.3U CN209046908U (en) | 2018-07-04 | 2018-07-04 | The LED emergency lamp control circuit of compound isolated form |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821052013.3U CN209046908U (en) | 2018-07-04 | 2018-07-04 | The LED emergency lamp control circuit of compound isolated form |
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| Publication Number | Publication Date |
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| CN209046908U true CN209046908U (en) | 2019-06-28 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201821052013.3U Withdrawn - After Issue CN209046908U (en) | 2018-07-04 | 2018-07-04 | The LED emergency lamp control circuit of compound isolated form |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108684107A (en) * | 2018-07-04 | 2018-10-19 | 深圳市威诺华照明电器有限公司 | The emergent lamp control circuits of the LED of compound isolated form |
-
2018
- 2018-07-04 CN CN201821052013.3U patent/CN209046908U/en not_active Withdrawn - After Issue
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108684107A (en) * | 2018-07-04 | 2018-10-19 | 深圳市威诺华照明电器有限公司 | The emergent lamp control circuits of the LED of compound isolated form |
| CN108684107B (en) * | 2018-07-04 | 2024-02-09 | 深圳市威诺华照明电器有限公司 | Duplex isolation type LED emergency lamp control circuit |
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