CN206293888U - Power-down protection apparatus based on magnetic latching relay - Google Patents
Power-down protection apparatus based on magnetic latching relay Download PDFInfo
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- CN206293888U CN206293888U CN201621418294.0U CN201621418294U CN206293888U CN 206293888 U CN206293888 U CN 206293888U CN 201621418294 U CN201621418294 U CN 201621418294U CN 206293888 U CN206293888 U CN 206293888U
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- Prior art keywords
- latching relay
- magnetic latching
- power
- circuit
- energy
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Abstract
The utility model discloses a kind of power-down protection apparatus based on magnetic latching relay, it is characterised in that including：Magnetic latching relay, drive circuit, control circuit, accumulator and protection circuit；The drive circuit includes two inputs and two output ends; described two inputs are respectively positive input and negative input; the positive input is connected with the first output end of the control circuit; the negative input is connected with the output end of the protection circuit and is connected with the second output end of the control circuit by isolation element, and described two output ends connect the two ends of the magnetic latching relay coil；The switching node of the magnetic latching relay is serially connected in electric power loop.Using the utility model, reliably magnetic latching relay can be resetted in power down.
Description
Technical field
The utility model is related to technical field of power-down protection, and in particular to a kind of power down protection based on magnetic latching relay
Device.
Background technology
Magnetic latching relay is as other electromagnetic relays, turn on automatically and cutting action to be played to circuit, and institute is not
With the normally closed or normally open of magnetic latching relay is entirely to rely on the effect of permanent-magnet steel, the conversion of its on off state
It is to be completed by the pulse electrical signal triggering of one fixed width.The contact opening and closing state of magnetic latching relay is usually by permanent magnetic
Magnetic force produced by iron is kept.When the contact of relay needs to open or during conjunction state, it is only necessary to just (anti-) DC-pulse
Pressure excitation coil, relay is just completed out and the State Transferring for closing in moment.When usual contact is in hold mode, coil is not
Need to continue to be powered, only the magnetic force by permanent magnet can just maintain the state of relay constant.
Power down protection refers to instrument or electrical equipment protected in the case of power-off suddenly the data for processing do not lose or
The function that person's function is not damaged.In the circuit with magnetic latching relay, if magnetic latching relay is also located during power down suddenly
In attracting state, and external equipment has stopped, and now needs to reset on relay, occurs during preventing upper electric unexpected.
In the prior art, the magnetic latching relay power down protection scheme of main flow generally has following two：
1. power supply parallel connection energy-storage travelling wave tube, during normal power-up, power supply is powered to the CPU of energy-storage travelling wave tube and equipment simultaneously,
After device looses power, powered to CPU by energy-storage travelling wave tube, when CPU detects current power supply state for power down, by software immediately
Reset signal is sent to magnetic latching relay, reset magnetic latching relay completes power down protection.
As shown in figure 1, being a kind of power-down protection circuit of existing magnetic latching relay.Wherein, MCU is powered by VCC, magnetic
The drive circuit of guard relay is powered by VDD, and the GPIO pins of MCU (master controller) detect whether power down.After VCC power down,
Energy-storage travelling wave tube C1 continues to be powered to MCU, and after VDD power down, energy-storage travelling wave tube C2 continues to drive circuitry, so that MCU is by soft
Part control magnetic latching relay disconnects.
It is such design on the product of small power consumption be applicable, but once CPU power consumption hundred more than mA or CPU power supply
Voltage also needs to other circuits to product and powers (such as liquid crystal display and peripheral function circuit), then have following drawback：One side
Face is difficult to find suitable energy-storage travelling wave tube, or the excessive influence product of energy-storage travelling wave tube volume globality；On the other hand, if storage
Energy element selection is improper, and conventional energy-storage travelling wave tube cannot drive the power supply circuit of hundred more than mA, therefore occur that software does not send also
Reset signal, energy-storage travelling wave tube energy has just exhausted, it is impossible to realize power down protection purpose.
2. replace energy-storage travelling wave tube with battery, be with above-mentioned difference, it is impossible to which battery is charged, but battery electric quantity and longevity
Life has time restriction, it is necessary to change battery, influences onsite application.
Utility model content
The utility model provides a kind of power-down protection apparatus based on magnetic latching relay, with power down reliably to magnetic
Guard relay is resetted.
Therefore, the utility model embodiment provides following technical scheme：
A kind of power-down protection apparatus based on magnetic latching relay, including：Magnetic latching relay, drive circuit, control electricity
Road, accumulator and protection circuit；The drive circuit includes two inputs and two output ends, described two inputs
End is respectively positive input and negative input, and the positive input is connected with the first output end of the control circuit,
The negative input is connected and by isolation element and the second of the control circuit with the output end of the protection circuit
Output end is connected, and described two output ends connect the two ends of the magnetic latching relay coil；
After electricity on electric power loop, the control two input output control signals of the circuit to the drive circuit,
So that the drive circuit drives the break-make of the switching node of magnetic latching relay；Cause the control letter in electric power loop power down
Number failure after, the accumulator be the drive circuitry, negative sense from the protection circuit to the drive circuit be input into
End output direct impulse signal, so that the switching node of the magnetic latching relay resets.
Preferably, the protection circuit includes PNP type triode, and the base stage of the triode passes through current-limiting resistance and power supply
It is connected, the colelctor electrode of the triode is connected to the ground by pull down resistor, the emitter stage of the triode passes through reverse isolation two
Pole pipe is connected with power supply, and the emitter stage of the triode is also connected to the ground by the first energy-storage travelling wave tube.
Preferably, first energy-storage travelling wave tube is polar capacitor, the hair of the positive pole of the polar capacitor and the triode
Emitter-base bandgap grading is connected, the negative pole ground connection of the polar capacitor.
Preferably, the accumulator includes：It is sequentially connected in series diode, resistance and second between power supply and ground
Energy-storage travelling wave tube, second energy-storage travelling wave tube is connected to the power end of the drive circuit with the connection end of resistance.
Preferably, second energy-storage travelling wave tube is farad capacitor, and the positive pole of the farad capacitor is connected with the resistance, institute
State the negative pole ground connection of farad capacitor.
Preferably, the isolation element is diode, and the positive pole of the diode is exported with the second of the control circuit
End is connected, and the negative pole of the diode is connected with the negative input of the drive circuit.
Preferably, it is described to control circuit for CPU.
The power-down protection apparatus based on magnetic latching relay that the utility model is provided, after electricity on electric power loop, by controlling
Circuit processed makes drive circuit drive the joint of magnetic latching relay to the drive circuit output control signal of magnetic latching relay
Point break-make；After electric power loop power down causes the control signal to fail, the first energy-storage travelling wave tube is the drive circuitry, and
And direct impulse signal is exported from protection circuit to the negative input of the drive circuit, so that magnetic latching relay is opened
Artis resets, and realizes power down protection.The power-down protection apparatus based on magnetic latching relay that the utility model is provided, in power down
Afterwards, it is not necessary to which software is controlled, it is that controllable magnetic latching relay resets completely by hardware circuit, is effectively improved the steady of product
It is qualitative.
Brief description of the drawings
In order to illustrate more clearly of the embodiment of the present application or technical scheme of the prior art, below will be to institute in embodiment
The accompanying drawing for needing to use is briefly described, it should be apparent that, drawings in the following description are only described in the utility model
Some embodiments, for those of ordinary skill in the art, other accompanying drawings can also be obtained according to these accompanying drawings.
Fig. 1 is the typical power-down protection circuit schematic diagram of existing magnetic latching relay；
Fig. 2 is the theory diagram of the power-down protection apparatus that the utility model is based on magnetic latching relay；
Fig. 3 is a kind of embodiment that the utility model is based on protection circuit in the power-down protection apparatus of magnetic latching relay；
Fig. 4 is a kind of embodiment that the utility model is based on accumulator in the power-down protection apparatus of magnetic latching relay；
Fig. 5 is that the utility model is based on magnetic latching relay and its driving electricity in the power-down protection apparatus of magnetic latching relay
A kind of embodiment on road.
Specific embodiment
In order that those skilled in the art more fully understand the scheme of the utility model embodiment, below in conjunction with the accompanying drawings and
Implementation method is described in further detail to the utility model embodiment.
For problem present in prior art magnetic latching relay power down protection, the utility model provides a kind of based on magnetic
The power-down protection apparatus of guard relay, reliable reset during magnetic latching relay power down is realized using hardware mode, it is ensured that weight
During new upper electricity in circuit equipment safety.
As shown in Fig. 2 being the theory diagram of the power-down protection apparatus that the utility model is based on magnetic latching relay.
The device includes：Magnetic latching relay 20, drive circuit 21, control circuit 22, accumulator 23 and protection electricity
Road 24；The drive circuit 21 includes two inputs and two output ends, and described two inputs are respectively positive input
RL+With negative input RL-, the positive input RL+The first output end I/O1 with the control circuit is connected, described negative
It is connected with the output end of the protection circuit to input RL- and by isolation element 25 and the of the control circuit 22
Two output end I/O2 are connected, and described two output ends connect the two ends of the coil of magnetic latching relay 20.
It should be noted that in actual applications, the magnetic latching relay 20 can be exported as passive dry contact,
Can be as active output.If the magnetic latching relay 20 is exported for passive dry contact, the switch of magnetic latching relay 20
Node need not concatenate power supply, and the input of external equipment is guided in two contacts of switching node, used as the switching value of external equipment
Input；If magnetic latching relay 20 is used as active output, need for two contacts of switching node to be serially connected in required power supply time
Lu Zhong, uses, as active output to be powered for external loading equipment.
After electricity on electric power loop, the control circuit 22 is believed to two input output controls of the drive circuit 21
Number, so that the drive circuit 21 drives the break-make of the switching node of magnetic latching relay 20；Cause institute in electric power loop power down
After stating control signal failure, the accumulator 23 is powered for the drive circuit 21, and the protection circuit 24 is to the driving
The negative input RL- output direct impulse signals of circuit 21, so that the switching node of the magnetic latching relay 20 resets.
It should be noted that during the power-down protection circuit can apply to the supply line of plurality of devices, such as, remote control,
Remote measurement, communicate, automatically control, in electromechanical integration and power electronic equipment, correspondingly, above-mentioned control circuit 22 can be had
The control unit of output port, such as CPU.
As shown in figure 3, being one kind that the utility model is based on protection circuit in the power-down protection apparatus of magnetic latching relay
Embodiment.
In this embodiment, the protection circuit includes：PNP type triode Q41, the base stage of the triode Q41 passes through
Current-limiting resistance R41 is connected with power Vcc, and the colelctor electrode of the triode Q41 is connected to the ground by pull down resistor R42, and described three
The emitter stage of pole pipe Q41 is connected by reverse isolation diode D41 with power Vcc, and the emitter stage of the triode Q41 also passes through
First energy-storage travelling wave tube EC41 is connected to the ground.Further, electric capacity C41 is also associated between power Vcc and ground, to play blocking
Effect.
Above-mentioned first energy-storage travelling wave tube EC41 can use polar capacitor, the positive pole of the polar capacitor and the triode
The emitter stage of Q41 is connected, the negative pole ground connection of the polar capacitor.The particular capacity of the polar capacitor can be selected as needed
Select, such as 100uF.Certainly, the first energy-storage travelling wave tube EC41 can also be according to practical application needs, using other types of storage
Energy element, such as rechargeable battery or non-rechargeable battery etc., do not limit this utility model embodiment.
It should be noted that in actual applications, above-mentioned PNP type triode Q41 can such as be used as switching device
The triode of model LMBT3906LT1G, certainly, in actual applications, it is also possible to come by other devices with identity function
Instead of not limiting this utility model embodiment.
As shown in figure 4, being one kind that the utility model is based on accumulator in the power-down protection apparatus of magnetic latching relay
Embodiment.
In this embodiment, the accumulator includes：It is sequentially connected in series the diode between power Vcc and ground
D31, D31, resistance R31 and the second energy-storage travelling wave tube EC31, the second energy-storage travelling wave tube EC31 are connected to the connection end of resistance R31
The power end VR of the drive circuit.
Above-mentioned second energy-storage travelling wave tube EC31 can use farad capacitor, the positive pole of the farad capacitor and the resistance R31
It is connected, the negative pole ground connection of the farad capacitor, the particular capacity of the farad capacitor can be selected according to according to application demand.
Certainly, the second energy-storage travelling wave tube EC31 using other types of energy-storage travelling wave tube, such as can also fill according to practical application needs
Battery or non-rechargeable battery etc., do not limit this utility model embodiment.
Resistance R31 can adjust resistance according to charging rate demand.Diode D31, D32 are used to be depressured, and utilize its list
To electric conductivity, farad capacitor EC31 reverse power supply after power down is prevented.In actual applications, can be driven according to magnetic latching relay
The situation of voltage, the mode to buck/boost carries out accommodation.
It should be noted that in actual applications, the drive circuit 21 in Fig. 2 can be using using existing some routines
Drive circuit, as shown in figure 5, be the utility model be based on magnetic latching relay power-down protection apparatus in magnetic latching relay and
A kind of embodiment of its drive circuit.
When RL+ is high level, there is forward current in magnetic latching relay coil；When RL- is high level, magnetic latching relay
There is reverse current in coil.Drive circuit is by 2 NPN multiple tubes Q211 and Q213,1 PNP multiple tubes Q212, related resistors group
Into.2 NPN triodes are included in NPN multiple tubes, PNP multiple tubes include 2 PNP triodes.
Work as RL+=1, during RL-=0, a PNP conducting in NPN conductings, Q212 in Q211；NPN cut-offs, Q212 in Q213
In another PNP cut-off.The sense of current for flowing through magnetic latching relay coil is：VR → Q212 (4 pin E pole → 3 pin C poles) → line
Circle forward end → coil backward end → Q211 (3 pin C pole → 4 pin E poles) → ground, relay contact is connected.
Work as RL+=0, during RL-=1, a PNP cut-off in NPN cut-offs, Q212 in Q211；NPN conductings, Q212 in Q213
In another PNP conducting.The sense of current for flowing through magnetic latching relay coil is：VR → Q212 (1 pin E pole → 6 pin C poles) → line
Circle backward end → coil forward end → Q213 (3 pin C pole → 4 pin E poles) → ground, relay contact disconnects.
Work as RL+=0, during RL-=0, all triodes all end, and coil no current flows through.
Work as RL+=1, during RL-=1, all triodes are all turned on, and power consumption is very big, such case is not allowed to be occurred.
It should be noted that above-mentioned NPN multiple tubes Q211 and Q213 be able to can be adopted using LMBT3904DWITIG, Q212
With LMBT3906DWITIG etc..
In this embodiment, the isolation element 25 uses diode, and the positive pole of the diode is electric with the control in Fig. 2
The second output end I/O2 on road is connected, and the negative pole of the diode is connected with the negative input RL_ of drive circuit.
It should be noted that in actual applications, the magnetic latching relay can be unicoil magnetic latching relay,
Can be twin coil magnetic latching relay, be illustrated by taking unicoil magnetic latching relay as an example in the embodiment.
Referring concurrently to Fig. 3, Fig. 4 and Fig. 5, under normal power supply state, triode Q41 be in cut-off state, magnetic keep after
Electrical equipment RL only controlled circuit controls.RL+ is 1, RL- for 0 is operating state；It is conversely reset state.
After power down, on the one hand, the farad capacitor EC31 in accumulator is to drive circuitry.On the other hand, electricity is protected
Road is worked, and EC41 provides direct impulse after a power failure as energy-storage travelling wave tube, while using the unilateral conduction of diode D41,
The electric current reverse direction flow Vcc of energy-storage travelling wave tube EC41 can be prevented.The capacity of EC41 can be according to being adjusted the need for pulse width.
Triode Q41 is turned on, and the negative input RL- to drive circuit provides a direct impulse, so that magnetic latching relay RL
Reset；Simultaneously using the unilateral conduction of diode 25, prevent electric current to be reverse flowed to control the second output end I/O2 of circuit, protect
The I/O port of shield control circuit.
The power-down protection apparatus based on magnetic latching relay that the utility model is provided, after electricity on electric power loop, by controlling
Circuit processed makes drive circuit drive the joint of magnetic latching relay to the drive circuit output control signal of magnetic latching relay
Point break-make；After electric power loop power down causes the control signal to fail, the first energy-storage travelling wave tube is the drive circuitry, and
And direct impulse signal is exported from protection circuit to the negative input of the drive circuit, so that magnetic latching relay is opened
Artis resets, and realizes power down protection.The power-down protection apparatus based on magnetic latching relay that the utility model is provided, in power down
Afterwards, it is not necessary to which software is controlled, it is that controllable magnetic latching relay resets completely by hardware circuit, is effectively improved the steady of product
It is qualitative.
The power-down protection apparatus based on magnetic latching relay that the utility model is provided, only need to individually give magnetic with energy-storage travelling wave tube
The drive circuitry of guard relay, by pure analog circuit reset magnetic latching relay, realizes power down protection, effectively saves
Space has been saved, the stability of power down protection has been improve.
The utility model embodiment is described in detail above, specific embodiment used herein is to this practicality
New to be set forth, the explanation of above example is only intended to help and understands the utility model device；Simultaneously for this area
Those skilled in the art, according to thought of the present utility model, will change in specific embodiments and applications,
In sum, this specification content should not be construed as to limitation of the present utility model.
Claims (7)
1. a kind of power-down protection apparatus based on magnetic latching relay, it is characterised in that including：Magnetic latching relay, driving electricity
Road, control circuit, accumulator and protection circuit；The drive circuit includes two inputs and two output ends, described
Two inputs are respectively positive input and negative input, and the positive input is exported with the first of the control circuit
End is connected, and the negative input is connected and by isolation element and the control electricity with the output end of the protection circuit
Second output end on road is connected, and described two output ends connect the two ends of the magnetic latching relay coil；
After electricity on electric power loop, the control two input output control signals of the circuit to the drive circuit, so that
The drive circuit drives the break-make of the switching node of magnetic latching relay；The control signal is caused to be lost in electric power loop power down
After effect, the accumulator is the drive circuitry, and the protection circuit is defeated to the negative input of the drive circuit
Go out direct impulse signal, so that the switching node of the magnetic latching relay resets.
2. device according to claim 1, it is characterised in that the protection circuit includes PNP type triode, three pole
The base stage of pipe is connected by current-limiting resistance with power supply, and the colelctor electrode of the triode is connected to the ground by pull down resistor, and described three
The emitter stage of pole pipe is connected by reverse isolation diode with power supply, and the emitter stage of the triode also passes through the first energy-storage travelling wave tube
It is connected to the ground.
3. device according to claim 2, it is characterised in that first energy-storage travelling wave tube is polar capacitor, the polarity
The positive pole of electric capacity is connected with the emitter stage of the triode, the negative pole ground connection of the polar capacitor.
4. device according to claim 1, it is characterised in that the accumulator includes：It is sequentially connected in series in power supply
Diode, resistance and the second energy-storage travelling wave tube and ground between, second energy-storage travelling wave tube are connected to described with the connection end of resistance
The power end of drive circuit.
5. device according to claim 4, it is characterised in that second energy-storage travelling wave tube is farad capacitor, the farad
The positive pole of electric capacity is connected with the resistance, the negative pole ground connection of the farad capacitor.
6. the device according to any one of claim 1 to 5, it is characterised in that the isolation element is diode, described two
The positive pole of pole pipe is connected with the second output end of the control circuit, the negative sense of the negative pole of the diode and the drive circuit
Input is connected.
7. the device according to any one of claim 1 to 5, it is characterised in that described to control circuit be CPU.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621418294.0U CN206293888U (en) | 2016-12-22 | 2016-12-22 | Power-down protection apparatus based on magnetic latching relay |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621418294.0U CN206293888U (en) | 2016-12-22 | 2016-12-22 | Power-down protection apparatus based on magnetic latching relay |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206293888U true CN206293888U (en) | 2017-06-30 |
Family
ID=59154314
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201621418294.0U Withdrawn - After Issue CN206293888U (en) | 2016-12-22 | 2016-12-22 | Power-down protection apparatus based on magnetic latching relay |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN206293888U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106486978A (en) * | 2016-12-22 | 2017-03-08 | 北京海林节能科技股份有限公司 | Power-down protection apparatus based on magnetic latching relay |
-
2016
- 2016-12-22 CN CN201621418294.0U patent/CN206293888U/en not_active Withdrawn - After Issue
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106486978A (en) * | 2016-12-22 | 2017-03-08 | 北京海林节能科技股份有限公司 | Power-down protection apparatus based on magnetic latching relay |
| CN106486978B (en) * | 2016-12-22 | 2019-03-19 | 北京海林节能科技股份有限公司 | Power-down protection apparatus based on magnetic latching relay |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20170630 Effective date of abandoning: 20190319 |
|
| AV01 | Patent right actively abandoned |