CN205846847U - A kind of power-down protection circuit - Google Patents
A kind of power-down protection circuit Download PDFInfo
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- CN205846847U CN205846847U CN201620608424.0U CN201620608424U CN205846847U CN 205846847 U CN205846847 U CN 205846847U CN 201620608424 U CN201620608424 U CN 201620608424U CN 205846847 U CN205846847 U CN 205846847U
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- power
- rechargeable battery
- input
- external devices
- relay
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Abstract
This utility model provides a kind of power-down protection circuit, including: input, outfan and energy storage for power supply unit；Described energy storage for power supply unit includes: microprocessor, for obtaining the working state signal of external devices and exporting power fail warning signal when input power power down to external devices；Rechargeable battery, provides electric energy for energy storage and when external devices power down for external devices by least one；Relay, at least two, the two ends of each rechargeable battery connect a relay respectively；When rechargeable battery charging energy-storing, the relay of rechargeable battery positive terminal and first via input conducting；When discharging rechargeable battery, all rechargeable batteries are connected, wherein, and the negative pole end of last described rechargeable battery and ground end conducting；Relay driver array, controls the conducting state of each described relay for control signal；Rechargeable battery is lithium battery.This utility model is damaged when being possible to prevent external devices due to unexpected power down suddenly.
Description
Technical field
This utility model relates to electronic circuit technology field, is specially a kind of power-down protection circuit.
Background technology
Laser instrument is as a kind of sophisticated product, and it must operate under a kind of stable state.If it occur that power down suddenly,
Internal precision optics is susceptible to irreversible damage, so needing power down protection design.Current power down protection is main
Uninterrupted power source to be dependent on (UPS).The major defect of commercially available UPS is that volume is the hugest, integrated owing to using lead-acid battery
Spend bad；Power down is not had to indicate, it is impossible to allow laser instrument actively shut down.Additionally, lead-acid battery charging is relatively slow, maximum discharge current is also
Limit, and do not met the reality of laser application.
Utility model content
The shortcoming of prior art in view of the above, the purpose of this utility model is to provide a kind of power-down protection circuit,
For solving the problem that in prior art, laser instrument is easily subject to damage when laser instrument power down.
For achieving the above object and other relevant purposes, this utility model provides a kind of power-down protection circuit, described power down
Protection circuit includes: be used for being connected and the input of described input power be divided into first via input with input power and the second road is defeated
The input entered；It is connected for the outfan to external devices output voltage with the input of the described first via；One end and described second
Road input is connected, and the other end is connected with described outfan, for entering described input power through the input of described second tunnel input
Row energy storage also provides the energy storage for power supply unit of electric energy through described outfan for described external devices when described external devices power down；
Described energy storage for power supply unit includes: be connected with described external devices, for obtaining the working state signal of described external devices also
When described input power power down to the microprocessor of described external devices output power fail warning signal；At least one, it is used for
Described input power is carried out energy storage and during in described external devices power down through described output through the input of described second tunnel input
Hold the rechargeable battery that electric energy is provided for described external devices；At least two, for controlling the energy storage of described rechargeable battery and putting
Electricity relay；The two ends of each described rechargeable battery connect a described relay respectively；Fill at described rechargeable battery
During electricity energy storage, the relay of described rechargeable battery positive terminal and the input conducting of the described first via, described negative electrode of chargeable battery end
Relay and ground end conducting；When described discharging rechargeable battery, the relay of first described rechargeable battery positive terminal is with described
Second tunnel input conducting；It is connected with each described relay with described microprocessor respectively, for the control according to described microprocessor
Signal processed controls the relay driver array of the conducting state of each described relay.
In an embodiment of the present utility model, described power-down protection circuit also includes: be correspondingly connected to each described charging
For the charging chip preventing described rechargeable battery from overcharging between anode end and the input of the described first via.
In an embodiment of the present utility model, the quantity at described rechargeable battery is one and puts at described rechargeable battery
During electricity, first described negative electrode of chargeable battery end and ground end conducting.
In an embodiment of the present utility model, the quantity at described rechargeable battery is more than one and at described rechargeable battery
During electric discharge, continuing of the positive terminal of the relay rechargeable battery described with the adjacent next one of first described negative electrode of chargeable battery end
Electrical equipment is connected, so that the series connection of all described rechargeable batteries, wherein, the negative pole end of last described rechargeable battery is led with ground end
Logical.
In an embodiment of the present utility model, described power-down protection circuit also includes: be connected with described outfan, in institute
It is switched to the period of discharge condition by charged state, for described external devices when stating external devices power down and at described rechargeable battery
The storage capacitor of power supply.
In an embodiment of the present utility model, described microprocessor is provided with for when described discharging rechargeable battery
Detect the voltage detecting circuit of the voltage that described second tunnel inputs, so that the voltage in described second tunnel input is less than pre-
If during magnitude of voltage, described microprocessor controls the charged state of each described rechargeable battery.
In an embodiment of the present utility model, described rechargeable battery is lithium battery.
In an embodiment of the present utility model, the circuit that on the circuit of described first via input and described second tunnel inputs
On be respectively arranged with Zener diode.
In an embodiment of the present utility model, described external devices is laser instrument.
As it has been described above, a kind of power-down protection circuit of the present utility model, have the advantages that
1, this utility model charging and discharging by Control rechargeable battery, at external devices (such as laser instrument)
During power down, rechargeable battery continues as external devices and powers, and provides warning signal when power down to external devices so that outside device
Part can work on after a period of time normal shutdown in time, is damaged during to prevent external devices due to unexpected power down suddenly
Bad.
2, the rechargeable battery in this utility model is lithium battery, and adult is low, and volume is little, lightweight, supports High-current output,
Discharge capability is strong.
3, this utility model simple in construction, controls flexibly, economical and practical, has wide applicability.
Accompanying drawing explanation
Fig. 1 is shown as the structural representation of a kind of power-down protection circuit of the present utility model.
Element numbers explanation
100 power-down protection circuits
110 inputs
120 outfans
130 energy storage for power supply unit
131 microprocessors
132 rechargeable batteries
133 relays
134 relay driver arrays
135 charging chips
Detailed description of the invention
Below by way of specific instantiation, embodiment of the present utility model being described, those skilled in the art can be by this theory
Content disclosed by bright book understands other advantages of the present utility model and effect easily.This utility model can also be by additionally
Different detailed description of the invention is carried out or applies, the every details in this specification can also based on different viewpoints with should
With, under without departing from spirit of the present utility model, carry out various modification or change.
The purpose of the present embodiment is to provide a kind of power-down protection circuit, is used for solving in prior art in laser instrument power down
Time laser instrument be easily subject to damage problem.The principle of a kind of power-down protection circuit of the present embodiment described in detail below and reality
Execute mode, make those skilled in the art need not creative work and be i.e. appreciated that a kind of power-down protection circuit of the present embodiment.
The present embodiment provides a kind of power-down protection circuit, specifically, as it is shown in figure 1, described power-down protection circuit 100 wraps
Include: for being connected with input power (such as provide 24V power supply input) and that the input of described input power is divided into the first via is defeated
Enter and the input 110 of the second tunnel input；It is connected for external devices output voltage, (power supply is defeated with the input of the described first via
Go out) outfan 120；One end is connected with described second tunnel input, and the other end is connected with described outfan 120, for described
Input power carries out energy storage through the input of described second tunnel input and during in described external devices power down through described outfan 120 is
Described external devices provides the energy storage for power supply unit 130 of electric energy.
In the present embodiment, described external devices is the device that the power down suddenly such as laser instrument are easily damaged.Input power warp
Input 110 is divided into two-way, and a road is directly connected with outfan 120, powers for external devices, and a road is energy storage for power supply unit
130 chargings.Wherein, it is respectively arranged with voltage stabilizing two pole on the circuit of described first via input and on the circuit of described second tunnel input
Pipe.Zener diode D1, the second road input and output side 120 are i.e. set on the circuit between first via input and output side 120
Between circuit on Zener diode D2 is set.
Specifically, as it is shown in figure 1, described energy storage for power supply unit 130 includes: microprocessor 131, rechargeable battery 132, relay
Device 133 and relay driver array 134.
In the present embodiment, described microprocessor 131 is connected with described external devices, for obtaining described external devices
Working state signal also exports power fail warning signal when described input power power down to described external devices.Described microprocessor
131 (MCU) are interacted with laser instrument by above-mentioned 2 signals, are isolated with laser instrument by optocoupler.One is by institute
After stating the power fail warning signal of microprocessor 131 output, i.e. externally fed disappearance, described microprocessor 131 can be to laser instrument
One alarm signal of main frame, allows laser instrument shut down.One is laser works status signal, is to be provided by laser instrument, accuses
Know the current state of current laser instrument.
In the present embodiment, described microprocessor 131 can detect the whether power down of described external devices and detect
Generate a power fail warning signal during electricity and described power fail warning signal is inputed to described external devices simultaneously.
Wherein, described microprocessor 131 utilizes optocoupler to carry out electrical isolation with laser instrument, when external power source power down, and institute
Stating microprocessor 131 provides a power fail warning signal to laser instrument, laser instrument can be cut out in time, described power-down protection circuit
100 make laser instrument a period of time that can work on to normal shutdown, are subject to during to prevent laser instrument due to unexpected power down suddenly
To damaging.
In the present embodiment, described rechargeable battery 132 at least, it is used for described input power through described second tunnel
The input of input carries out energy storage and provides electricity through described outfan 120 for described external devices when described external devices power down
Energy.
Wherein, in the present embodiment, described rechargeable battery 132 is lithium battery.The lead-acid battery that lithium battery is relatively conventional, its
Major advantage is that energy density is high, and about 6-7 times of lead-acid battery, lightweight, and under same volume, weight is the 1/5 of lead-acid battery,
Discharge capability is strong, and dynamic lithium battery can realize the discharge capability of 5-10C.Hence with lithium battery as laser instrument power down protection side
Case, relative to traditional UPS scheme, with the obvious advantage.And use lithium battery as laser instrument power down protection scheme, there is cost
Cheap, lightweight, support the advantage of High-current output.
In the present embodiment, described relay 133 at least two, the two ends of each described rechargeable battery 132 are respectively
Connect a described relay 133, for controlling energy storage and the electric discharge of described rechargeable battery 132.It is to say, in the present embodiment
In, the positive and negative polarities of each joint lithium battery are respectively arranged with a relay 133, are used for switching charge mode or discharge mode.
Specifically, when described rechargeable battery 132 charging energy-storing, the relay of described rechargeable battery 132 positive terminal 133 with
The input conducting of the described first via, the relay 133 of described rechargeable battery 132 negative pole end and ground end conducting；At described rechargeable battery
During 132 electric discharge, the relay 133 of first described rechargeable battery 132 positive terminal and described second tunnel input conducting.Wherein, exist
The quantity of described rechargeable battery 132 is one and when described rechargeable battery 132 discharges, and first described rechargeable battery 132 is negative
Extreme and ground end turns on.When the quantity of described rechargeable battery 132 more than one and is discharged at described rechargeable battery 132, first
The relay of the positive terminal of relay 133 rechargeable battery described with the adjacent next one 132 of individual described rechargeable battery 132 negative pole end
Device 133 is connected, so that all described rechargeable batteries 132 are connected, wherein, and the negative pole end of last described rechargeable battery 132
Turn on ground end.
In the present embodiment, described power-down protection circuit 100 also includes: be just correspondingly connected to each described rechargeable battery 132
For the charging chip 135 preventing described rechargeable battery 132 from overcharging between the input of the extreme and described first via.
In the present embodiment, described relay driver array 134 respectively with described microprocessor 131 and each described relay
Device 133 is connected, and controls the conducting state of each described relay 133 for the control signal according to described microprocessor 131.This
In embodiment, utilize described microprocessor 131 (MCU) to control relay 133 switching by relay driver array 134 and fill
Power mode and discharge mode.
During charge mode, each lithium battery one terminates a charging chip 135, other end ground connection.Lithium battery connects
Charging chip 135 ensures that lithium battery will not produce fault because of overcharging.Wherein, in the present embodiment, at described rechargeable battery
132 fully charged time, described charging chip 135 generates a command signal and sends described command signal to described microprocessor 131,
So that microprocessor 131 controls described relay driver array 134 and controls the conducting state of each described relay 133.I.e.
When lithium cell charging completes, charging chip 135 can be sent a signal and inform microprocessor 131.When all lithium cell chargings
After completing, power-down protection circuit 100 enters discharge mode.
During discharge mode, lithium battery is switched by relay 133, successively head and the tail series connection, it is achieved power-down protection.
In the present embodiment, described power-down protection circuit 100 also includes: be connected with described outfan 120, in described outside
It is switched to the period of discharge condition by charged state during device power down and at described rechargeable battery, powers for described external devices
Storage capacitor.
Additionally, in the present embodiment, described microprocessor 131 is provided with for when described rechargeable battery 132 discharges
Detect the voltage detecting circuit of the voltage that described second tunnel inputs, so that the voltage in described second tunnel input is less than pre-
If during magnitude of voltage, described microprocessor controls the charged state of each described rechargeable battery 132.When microprocessor 131 (MCU) detects
During to total output voltage deficiency, again lithium battery can be switched back into charge mode.
When laser instrument power down, if power-down protection circuit 100 is when discharge mode, can directly provide electric energy to laser
Device, until laser works state becomes shutdown.After laser instrument shuts down, described microprocessor 131 can control relay 133
Switch to charge mode, no longer provide electric energy to laser instrument.If during laser instrument power down, power-down protection circuit 100 is in charging shape
State, described microprocessor 131 can switch rapidly relay 133, make power-down protection circuit 100 enter discharge condition.This section switches
Time be to maintain laser instrument to power continuous print by storage capacitor.
As can be seen here, the power-down protection circuit 100 of the present embodiment is controlled the charging of lithium battery by relay 133 and is put
Electricity, when external devices (such as laser instrument) power down, lithium battery continues as external devices and powers so that external devices can continue
Work a period of time.
In sum, this utility model charging and discharging by Control rechargeable battery, in external devices (such as
Laser instrument) power down time, rechargeable battery continues as external devices and powers, and provides warning signal when power down to external devices, makes
External devices can work on after a period of time normal shutdown in time, during to prevent external devices due to unexpected power down suddenly
It is damaged；Rechargeable battery in this utility model is lithium battery, and adult is low, and volume is little, lightweight, supports High-current output,
Discharge capability is strong；This utility model simple in construction, controls flexibly, economical and practical, has wide applicability.So, this practicality
Novel effectively overcome various shortcoming of the prior art and have high industrial utilization.
Above-described embodiment only illustrative principle of the present utility model and effect thereof are new not for limiting this practicality
Type.Above-described embodiment all can be carried out by any person skilled in the art under spirit and the scope of the present utility model
Modify or change.Therefore, art has usually intellectual such as without departing from the essence disclosed in this utility model
All equivalences completed under god and technological thought are modified or change, and must be contained by claim of the present utility model.
Claims (9)
1. a power-down protection circuit, it is characterised in that: described power-down protection circuit includes:
For being connected with input power and the input of described input power being divided into first via input and the input of the second tunnel input
End；
It is connected for the outfan to external devices output voltage with the input of the described first via；
One end is connected with described second tunnel input, and the other end is connected with described outfan, is used for described input power through described
The input of the second tunnel input carries out energy storage and provides for described external devices through described outfan when described external devices power down
The energy storage for power supply unit of electric energy；Described energy storage for power supply unit includes:
It is connected with described external devices, for obtaining the working state signal of described external devices and in described input power power down
Time to described external devices output power fail warning signal microprocessor；
At least one, for described input power is carried out energy storage and at described outside device through the input of described second tunnel input
The rechargeable battery of electric energy is provided through described outfan for described external devices during part power down；
At least two, for control the energy storage of described rechargeable battery and electric discharge relay；Each described rechargeable battery
Two ends connect a described relay respectively；When described rechargeable battery charging energy-storing, continuing of described rechargeable battery positive terminal
Electrical equipment and the input conducting of the described first via, the relay of described negative electrode of chargeable battery end and ground end conducting；At described rechargeable battery
During electric discharge, the relay of first described rechargeable battery positive terminal and described second tunnel input conducting；
It is connected with each described relay with described microprocessor respectively, controls for the control signal according to described microprocessor each
The relay driver array of the conducting state of described relay.
Power-down protection circuit the most according to claim 1, it is characterised in that: described power-down protection circuit also includes: corresponding
It is connected between each described rechargeable battery positive terminal and the input of the described first via for preventing described rechargeable battery from overcharging
Charging chip.
Power-down protection circuit the most according to claim 1, it is characterised in that: the quantity at described rechargeable battery be one and
When described discharging rechargeable battery, first described negative electrode of chargeable battery end and ground end conducting.
Power-down protection circuit the most according to claim 1, it is characterised in that: the quantity at described rechargeable battery is more than one
And when described discharging rechargeable battery, the relay charging described with the adjacent next one of first described negative electrode of chargeable battery end
The relay of the positive terminal of battery is connected, so that the series connection of all described rechargeable batteries, wherein, last described rechargeable battery
Negative pole end with ground end conducting.
Power-down protection circuit the most according to claim 1, it is characterised in that: described power-down protection circuit also includes: with institute
State outfan to connect, when described external devices power down and at described rechargeable battery, be switched to discharge condition by charged state
Period, the storage capacitor powered for described external devices.
Power-down protection circuit the most according to claim 5, it is characterised in that: it is provided with on described microprocessor in institute
The voltage detecting circuit of the voltage that described second tunnel inputs is detected when stating discharging rechargeable battery, so that defeated on described second road
When voltage on entering is less than preset voltage value, described microprocessor controls the charged state of each described rechargeable battery.
7. according to the power-down protection circuit described in claim 1～6 any claim, it is characterised in that: described rechargeable battery
For lithium battery.
Power-down protection circuit the most according to claim 1, it is characterised in that: with described on the circuit of described first via input
It is respectively arranged with Zener diode on the circuit of the second tunnel input.
Power-down protection circuit the most according to claim 1, it is characterised in that: described external devices is laser instrument.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620608424.0U CN205846847U (en) | 2016-06-20 | 2016-06-20 | A kind of power-down protection circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620608424.0U CN205846847U (en) | 2016-06-20 | 2016-06-20 | A kind of power-down protection circuit |
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| CN205846847U true CN205846847U (en) | 2016-12-28 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107528380A (en) * | 2016-06-20 | 2017-12-29 | 国神光电科技（上海）有限公司 | A kind of power-down protection circuit |
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- 2016-06-20 CN CN201620608424.0U patent/CN205846847U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107528380A (en) * | 2016-06-20 | 2017-12-29 | 国神光电科技（上海）有限公司 | A kind of power-down protection circuit |
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