CN205753618U - A kind of power-down protection circuit - Google Patents
A kind of power-down protection circuit Download PDFInfo
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- CN205753618U CN205753618U CN201620474372.2U CN201620474372U CN205753618U CN 205753618 U CN205753618 U CN 205753618U CN 201620474372 U CN201620474372 U CN 201620474372U CN 205753618 U CN205753618 U CN 205753618U
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Abstract
This utility model provides a kind of power-down protection circuit, including: 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；It is connected for the outfan to external devices output voltage with first via input；For to input power through the input that the second tunnel inputs carry out energy storage and during in external devices power down through outfan be the energy storage for power supply unit that external devices provides electric energy；Wherein, energy storage for power supply unit includes super capacitor, controls the constant-current source of super capacitor energy-storage；Control the boost control circuit that super capacitor is powered；Described power-down protection circuit also includes detection of power loss Alarm Unit.This utility model utilizes the energy storage principle of super capacitor when external devices (such as laser instrument) power down, continue as external devices to power, there is provided warning signal to external devices so that external devices can normal shutdown in time, be damaged during to prevent external devices due to unexpected unexpected power down.
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 mainly relies on uninterrupted power source (UPS).The major defect of commercially available UPS is that volume is the hugest, and integrated level is bad owing to using lead-acid battery；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 has limited, and does not meets 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, and 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 input that the second tunnel inputs；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, the other end is connected with described outfan, for described input power through the input of described second tunnel input carry out energy storage and during in described external devices power down through described outfan be the energy storage for power supply unit that described external devices provides electric energy.
In an embodiment of the present utility model, described energy storage for power supply unit includes super capacitor.
In an embodiment of the present utility model, described energy storage for power supply unit also includes the constant-current source being connected to control described super capacitor energy-storage between described input power and described super capacitor.
In an embodiment of the present utility model, described constant-current source includes the voltage source for exporting constant current, detection charging current to the amplifier of described voltage source feedback voltage and control the switch that described constant-current source charges to described super capacitor.
In an embodiment of the present utility model, described switch is metal-oxide-semiconductor or audion.
In an embodiment of the present utility model, described energy storage for power supply unit also includes being connected between described outfan and described super capacitor for boosting the output voltage of described super capacitor and controlling the boost control circuit that described super capacitor is powered.
In an embodiment of the present utility model, described boost control circuit includes: the boosting electronic circuit boosting the output voltage of described super capacitor and the hysteresis electronic circuit of the electronic circuit that boosts according to the Control of Voltage of described super capacitor.
In an embodiment of the present utility model, described power-down protection circuit also includes: be connected with the input of the described first via and described energy storage for power supply unit respectively for detecting the whether power down of described external devices and generating a warning signal when power down being detected described warning signal inputs to the detection of power loss Alarm Unit of described external devices simultaneously.
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 utilizes the energy storage principle of super capacitor when external devices (such as laser instrument) power down, continue as external devices to power, and fall electric circuit inspection power down by detection, warning signal is provided to external devices, external devices can be worked on after a period of time normal shutdown in time, be damaged during to prevent external devices due to unexpected power down suddenly.
2, this utility model adult is low, and volume is little, and the energy storage charging interval is short, supports High-current output.
3, this utility model simple in construction, controls flexibly, economical and practical, has wide applicability.
Accompanying drawing explanation
Fig. 1 is shown as the theory diagram of a kind of power-down protection circuit of the present utility model.
Fig. 2 is shown as a kind of preferably theory diagram of a kind of power-down protection circuit of the present utility model.
Fig. 3 is shown as the structural representation of a kind of power-down protection circuit of the present utility model.
Fig. 4 is shown as a kind of structural representation of constant-current source in a kind of power-down protection circuit of the present utility model.
Fig. 5 is shown as a kind of structural representation of hysteresis electronic circuit in a kind of power-down protection circuit of the present utility model.
Element numbers explanation
1 power-down protection circuit
11 inputs
12 outfans
13 energy storage for power supply unit
131 constant-current sources
132 boost control circuits
14 detection of power loss Alarm Units
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 understood other advantages of the present utility model and effect easily by the content disclosed by this specification.This utility model can also be carried out by the most different detailed description of the invention or apply, and the every details in this specification can also carry out various modification or change based on different viewpoints and application under without departing from spirit of the present utility model.
The purpose of the present embodiment 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.The principle of a kind of power-down protection circuit of the present embodiment described in detail below and embodiment, 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 shown in Figure 1, described power-down protection circuit 1 includes: for being connected with input power and the input of described input power being divided into first via input and the input 11 of the second tunnel input, it is connected for the outfan 12 of external devices output voltage with the input of the described first via, one end is connected with described second tunnel input, the other end is connected with described outfan 12, for to described input power through the input of described second tunnel input carry out energy storage and during in described external devices power down through described outfan 12 be the energy storage for power supply unit 13 that described external devices provides electric energy.As in figure 2 it is shown, described power-down protection circuit 1 also includes: be connected with the input of the described first via and described energy storage for power supply unit 13 respectively for detecting the whether power down of described external devices and generating a warning signal when power down being detected described warning signal is inputed to the detection of power loss Alarm Unit 14 of described external devices simultaneously.
Hereinafter the power-down protection circuit 1 in the present embodiment is described in detail.
As it is shown on figure 3, be shown as the concrete structure schematic diagram of a kind of power-down protection circuit 1 in the present embodiment.In the present embodiment, described external devices is the device that the power down suddenly such as laser instrument are easily damaged.Input power is divided into two-way through input 11, and a road is directly connected with outfan 12, powers for external devices, and a road is that energy storage for power supply unit 13 charges.Wherein, the circuit between first via input and output side can arrange Zener diode D1, the circuit between the second road input and output side can arrange Zener diode D2.
In the present embodiment, as shown in Figure 3, described energy storage for power supply unit 13 includes super capacitor C1, is connected between described input power and described super capacitor C1 control the constant-current source 131 of described super capacitor C1 energy storage and be connected between described outfan 12 and described super capacitor C1 for boosting the output voltage of described super capacitor C1 and controlling the boost control circuit 132 that described super capacitor C1 powers.
Wherein, in the present embodiment, use super capacitor C1 that through the input of described second tunnel input, described input power is carried out energy storage and be that described external devices provides electric energy through described outfan 12 during in described external devices power down.Super capacitor C1 is the power supply of a kind of energy that has specific characteristics between traditional capacitance and battery, and its major advantage is that power density is high, and the discharge and recharge time is short, electric current is big, and operating temperature range width utilizes super capacitor C1 as energy storage and power supply component, relative to traditional UPS scheme, with the obvious advantage.
Use voltage source can reduce cost as constant-current source 131, use voltage source chip and Current Feedback Control Circuit.Specifically, as shown in Figure 4, described constant-current source 131 includes the voltage source for exporting constant current, detection charging current to the amplifier A1 of described voltage source feedback voltage and control the switch that described constant-current source 131 charges to described super capacitor C1.
Wherein, described amplifier A1 is preferably instrument amplifier.Described switch is metal-oxide-semiconductor or audion Q1.Resistance R1 is sampling resistor, and charging current is by, after resistance R1, becoming voltage signal, after instrument amplifier A1 amplifies, controls voltage source, it is achieved constant-current charge.Resistance R2 and resistance R3 is divider resistance, and after super capacitor C1 voltage arrives setting voltage, audion Q1 turns on, and makes voltage source enter pressure constant state, super capacitor C1 is carried out constant-voltage charge.
Instrument amplifier is used for detecting charging current, and to voltage source chip input feedback voltage Vfb, the output voltage Vout of dynamic regulation of voltage source chip, audion Q1 are used for controlling constant-voltage charge.Setting threshold value when the voltage of super capacitor C1 arrives, audion Q1 turns on, and super capacitor C1 voltage will immobilize.
In the present embodiment, described boost control circuit 132 includes: the boosting electronic circuit boosting the output voltage of described super capacitor C1 and the hysteresis electronic circuit of the electronic circuit that boosts according to the Control of Voltage of described super capacitor C1.Described hysteresis electronic circuit works under described super capacitor C1 is in the voltage threshold that described hysteresis electronic circuit sets.
The structure of the boosting electronic circuit boosting output voltage as it is known to those skilled in the art that not repeat them here.
Specifically, in the present embodiment, as it is shown in figure 5, hysteresis electronic circuit is made up of open-drain output comparator CP1 and resistance R1, resistance R2 and a resistance R3.When the positive terminal voltage of open-drain output comparator CP1 is more than negative terminal voltage, export high resistant, when the positive terminal voltage of open-drain output comparator CP1 is less than negative terminal voltage, output earth short circuit.Vref1 and Vref2 is 2 reference voltages.When the voltage of super capacitor C1 is relatively low, the anode electricity of open-drain output comparator CP1 is less than reference voltage Vref 1, and open-drain output comparator CP1 output earth short circuit, described boosting electronic circuit does not works.
Charging through after a while, as Vref1 < Vcap*R1/ (R1+R2), open-drain output comparator CP1 output becomes high-impedance state.Now, output voltage Vrun=(Vref2-Vcap) * (R1+R2)/(R1+R2+R3)+Vcap, boosting electronic circuit is started working.After power down, input voltage Vcap slowly reduces, until (Vref2-Vcap) * R2/ (R1+R2+R3)+Vcap < after Vref1, electronic circuit power cut-off of boosting, external devices power-off.By regulating different resistance R1, resistance R2, resistance R3 and reference voltage Vref 1 and reference voltage Vref 2, boosting electronic circuit can be made to start working and input voltage Vcap during power cut-off is different, it is achieved the effect of hysteresis.
The voltage that starts of described boosting electronic circuit is determined by the size of described super capacitor C1 with closing voltage.Further, described boosting electronic circuit more than the voltage threshold that described hysteresis electronic circuit sets time start working.Now super capacitor C1 can export electric energy to external devices, and the voltage of super capacitor C1 slowly declines, and when the voltage threshold that the voltage of super capacitor C1 sets less than described hysteresis electronic circuit, boosting electronic circuit quits work.Now super capacitor C1 stops exporting electric energy to external devices.In the present embodiment, the voltage threshold that described hysteresis electronic circuit sets is as 3V～7V.
In the present embodiment, charging and the power supply process of super capacitor C1 are as follows: being divided into two-way after the input of 24V power supply, a road powers for external devices, and another road is for charging to super capacitor C1.Super capacitor C1 charging is consistent with general battery, can elder generation's constant-current charge constant-voltage charge again, but its charging current can relatively greatly, the charging interval is short.
When super capacitor C1 voltage is more than 7V, boosting electronic circuit quits work beginning work, and super capacitor C1 can be to outside device
Part output electric energy, when super capacitor C1 voltage is less than 3V, boosting electronic circuit quits work, and is used for ensureing that super capacitor C1 will not damage due to over-discharge.
As can be seen here, the power-down protection circuit 1 of the present embodiment utilizes the energy storage principle of super capacitor C1 when external devices (such as laser instrument) power down, continues as external devices and powers so that external devices can work on a period of time.
In the present embodiment, described detection of power loss Alarm Unit 14 is connected with the input of the described first via and described energy storage for power supply unit 13 respectively, is used for detecting the whether power down of described external devices and generates a warning signal when power down being detected and described warning signal is inputed to described external devices simultaneously.
Such as, described detection of power loss Alarm Unit 14 utilizes optocoupler to carry out electrical isolation with laser instrument, when external power source power down, described detection of power loss Alarm Unit 14 provides a warning signal, laser instrument can be cut out in time, make laser instrument a period of time that can work on to normal shutdown, be damaged during to prevent laser instrument due to unexpected power down suddenly.
In sum, this utility model utilizes the energy storage principle of super capacitor when external devices (such as laser instrument) power down, continue as external devices to power, make external devices a period of time that can work on to normal shutdown, be damaged during to prevent external devices due to unexpected power down suddenly；This utility model adult is low, and volume is little, and the energy storage charging interval is short, supports High-current output；This utility model simple in construction, controls flexibly, economical and practical, has wide applicability.So, this utility model effectively overcomes various shortcoming of the prior art and has high industrial utilization.
Above-described embodiment only illustrative principle of the present utility model and effect thereof, not for limiting this utility model.Above-described embodiment all can be modified under spirit and the scope of the present utility model or change by any person skilled in the art.Therefore, art has all equivalence modification or changes that usually intellectual is completed under without departing from the spirit disclosed in this utility model and technological thought such as, 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.
Power-down protection circuit the most according to claim 1, it is characterised in that: described energy storage for power supply unit includes super capacitor.
Power-down protection circuit the most according to claim 2, it is characterised in that: described energy storage for power supply unit also includes being connected to institute
State the constant-current source controlling described super capacitor energy-storage between input power and described super capacitor.
Power-down protection circuit the most according to claim 3, it is characterised in that: described constant-current source includes for exporting constant current
Voltage source, detection charging current to the amplifier of described voltage source feedback voltage and control described constant-current source to described super
The switch of level electric capacity charging.
Power-down protection circuit the most according to claim 4, it is characterised in that: described switch is metal-oxide-semiconductor or audion.
6. according to the power-down protection circuit described in Claims 2 or 3, it is characterised in that: described energy storage for power supply unit also includes being connected to
For the output voltage of described super capacitor being boosted and controlling described super between described outfan and described super capacitor
The boost control circuit of level capacitances to supply power.
Power-down protection circuit the most according to claim 6, it is characterised in that: described boost control circuit includes: to described super
Boosting electronic circuit that the output voltage of electric capacity carries out boosting and according to the electronic circuit that boosts described in the Control of Voltage of described super capacitor
Hysteresis electronic circuit.
Power-down protection circuit the most according to claim 1, it is characterised in that: described power-down protection circuit also includes: respectively with institute
State first via input to be connected with described energy storage for power supply unit for detecting the whether power down of described external devices and power down being detected
Described warning signal is inputed to the detection of power loss Alarm Unit of described external devices by Shi Shengcheng mono-warning signal simultaneously.
Power-down protection circuit the most according to claim 1, it is characterised in that: described external devices is laser instrument.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620474372.2U CN205753618U (en) | 2016-05-23 | 2016-05-23 | A kind of power-down protection circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620474372.2U CN205753618U (en) | 2016-05-23 | 2016-05-23 | A kind of power-down protection circuit |
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| CN205753618U true CN205753618U (en) | 2016-11-30 |
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| CN201620474372.2U Active CN205753618U (en) | 2016-05-23 | 2016-05-23 | A kind of power-down protection circuit |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105846541A (en) * | 2016-05-23 | 2016-08-10 | 国神光电科技（上海）有限公司 | Power-down protection circuit |
| CN112952542A (en) * | 2021-02-01 | 2021-06-11 | 中国航空制造技术研究院 | Control system and control method for self-adaptive transmission of laser energy |
| EP4362274A3 (en) * | 2022-10-31 | 2024-05-08 | Carrier Corporation | Battery box, air conditioning system, and method for the air conditioning system |
-
2016
- 2016-05-23 CN CN201620474372.2U patent/CN205753618U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105846541A (en) * | 2016-05-23 | 2016-08-10 | 国神光电科技（上海）有限公司 | Power-down protection circuit |
| CN112952542A (en) * | 2021-02-01 | 2021-06-11 | 中国航空制造技术研究院 | Control system and control method for self-adaptive transmission of laser energy |
| EP4362274A3 (en) * | 2022-10-31 | 2024-05-08 | Carrier Corporation | Battery box, air conditioning system, and method for the air conditioning system |
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