CN106374573A - Overvoltage protection circuit and power supply circuit - Google Patents
Overvoltage protection circuit and power supply circuit Download PDFInfo
- Publication number
- CN106374573A CN106374573A CN201610901224.9A CN201610901224A CN106374573A CN 106374573 A CN106374573 A CN 106374573A CN 201610901224 A CN201610901224 A CN 201610901224A CN 106374573 A CN106374573 A CN 106374573A
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- voltage
- unit
- relay
- detecting
- signal
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Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0063—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with circuits adapted for supplying loads from the battery
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J2207/00—Indexing scheme relating to details of circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J2207/10—Control circuit supply, e.g. means for supplying power to the control circuit
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Protection Of Static Devices (AREA)
Abstract
The invention discloses an overvoltage protection circuit and a power supply circuit. The overvoltage protection circuit comprises a voltage sensing unit, a relay and a low dropout linear voltage stabilization unit, wherein the voltage sensing unit is used for sensing an actual voltage of an input end, the relay is coupled between the input end and an output end, and the low dropout linear voltage stabilization unit is connected in parallel with the relay; when the actual voltage is smaller than or equal to a preset voltage, the relay is opened, and the voltage passes through the relay and is output from the output end; and when the actual voltage is larger than the preset voltage, the relay is closed, the voltage is adjusted by the low dropout linear voltage stabilization unit and then is output from the output end. On the basis of achieving an overvoltage protection function, the application time of a battery is prolonged; and moreover, the circuit design is simpler.
Description
Technical field
The present invention relates to a kind of excess voltage protection and power supply circuit, more particularly, to one kind can be protected with it even
The excess voltage protection of the power device connecing and power supply circuit.
Background technology
After general lead-acid battery is fully charged, cell voltage can be increased beyond 10%, if now by power device and plumbic acid
Battery connects use, then the rising because of cell voltage damages power device.Common processing mode is in lead-acid battery
Couple dc/dc transducer and power device between, the Voltage Cortrol making lead-acid battery using dc/dc transducer to desired value,
But so, forever there is a dead loss in circuit, lead to less efficient, and service time of battery is short.
Content of the invention
It is an object of the invention to provide a kind of excess voltage protection and power supply circuit, it can protect electricity consumption to set
Standby, and compared with traditional circuit, circuit design is simpler, in hgher efficiency and service time of battery can be increased.
In order to achieve the above object, the present invention proposes a kind of excess voltage protection, and it has input and outfan, mistake
Voltage protection circuit comprises detecting voltage unit, relay and low pressure difference linearity voltage regulation unit.Detecting voltage unit is coupled to
This input, this detecting voltage unit is used for detecting the virtual voltage of this input；Relay is coupled to this input and this is defeated
Go out between end；Low pressure difference linearity voltage regulation unit is in parallel with this relay；Wherein, when this virtual voltage is less than or equal to predeterminated voltage
When, this relay is opened, and this virtual voltage exports from this outfan via this relay；When this virtual voltage is more than this default electricity
During pressure, this cut-off, this virtual voltage exports from this outfan via after the adjustment of this low pressure difference linearity voltage regulation unit.
As optional technical scheme, when this virtual voltage is less than or equal to this predeterminated voltage, this detecting voltage unit is sent out
Go out the first signal to this relay, this relay is opened according to this first switch signal；When this virtual voltage is more than this default electricity
During pressure, this detecting voltage unit sends second switch signal to this relay, and this relay cuts out according to this secondary signal.
As optional technical scheme, this excess voltage protection also comprises first switch unit, this first switch unit
It is coupled between this detecting voltage unit and this relay, preset less than this when this detecting voltage unit detects this virtual voltage
During voltage, this detecting voltage unit sends the first signal to this first switch unit, and this first switch unit is according to this first letter
This relay number is made to open；When this detecting voltage unit detects this virtual voltage and is more than this predeterminated voltage, this voltage is detectd
Survey unit and send secondary signal to this first switch unit, this first switch makes this cut-off according to this secondary signal.
As optional technical scheme, this first signal is the first low level signal, and this secondary signal is the first high level
Signal.
As optional technical scheme, this first switch unit is mos switch element.
As optional technical scheme, this first switch unit comprises the first n-type transistor and the second n-type transistor, should
The grid of the first n-type transistor couples the second end of this detecting voltage unit, and this second end is the signal of this detecting voltage unit
Outfan, the drain electrode of this first n-type transistor couples the grid of this second n-type transistor, the drain electrode coupling of this second n-type transistor
Connect this relay.
As optional technical scheme, this low pressure difference linearity voltage regulation unit comprises the first low pressure difference linear voltage regulator.
As optional technical scheme, this low pressure difference linearity voltage regulation unit also comprises the second low pressure difference linear voltage regulator, should
First low pressure difference linear voltage regulator is in parallel with this second low pressure difference linear voltage regulator.
Additionally, the present invention also proposes a kind of power supply circuit, comprise above-mentioned excess voltage protection.
As optional technical scheme, this power supply circuit also comprises battery, and this battery is connected to this input.
The excess voltage protection of the present invention and power supply circuit, detect the actual electricity of battery using detecting voltage unit
Pressure, when the virtual voltage of battery is less than or equal to predeterminated voltage, relay is opened, and the voltage of battery exports to use via relay
Electric equipment.When the virtual voltage of battery is more than predeterminated voltage, cut-off, the voltage of battery is through low pressure difference linearity voltage stabilizing
Unit reaches electrical equipment after being down to safe voltage value again, thus reaching the purpose of protection electrical equipment.Additionally, the present invention will be low
Pressure reduction linear voltage stabilization unit is used as overvoltage and consumes protection circuit, consumes the portion of overvoltage using low pressure difference linearity voltage regulation unit
Point, in remaining working time, almost all of battery supply all exports through relay, and then is reaching the work(of overvoltage protection
Extend the use time of battery on the basis of energy, and circuit design is simpler.
Describe the present invention below in conjunction with the drawings and specific embodiments, but not as a limitation of the invention.
Brief description
Fig. 1 is the block diagram of the first embodiment of power supply circuit of the present invention；
Fig. 2 is the block diagram of the second embodiment of power supply circuit of the present invention；
Fig. 3 is the local circuit structure chart of the second embodiment of power supply circuit of the present invention；
Fig. 4 is the partial discharge curve chart of battery in the power supply circuit of the present invention.
Specific embodiment
The explanation of following embodiment is with reference to additional schema, the particular implementation implemented in order to illustrate the present invention may be used to
Example.The direction term that the present invention is previously mentioned, for example " on ", D score, "front", "rear", "left", "right", " side " etc., be only reference
The direction of annexed drawings.Therefore, the direction term of use is to illustrate and understand the present invention, and is not used to limit the present invention.
In the examples below, in various figures, same section is to be represented with identical label.
Refer to Fig. 1, Fig. 1 is the block diagram of the first embodiment of power supply circuit of the present invention.As shown in figure 1, this
The power supply circuit 100 of invention comprises excess voltage protection 1000.Excess voltage protection 1000 has input 1001
And outfan 1002.Excess voltage protection 1000 also comprises detecting voltage unit 1100, relay 1200 and low pressure difference linearity
Voltage regulation unit 1300.Detecting voltage unit 1100 is coupled to input 1001, and detecting voltage unit 1100 is used for detecting input
1001 virtual voltage v1；Relay 1200 is coupled between input 1001 and outfan 1002；Low pressure difference linearity voltage stabilizing list
Unit 1300 is in parallel with relay 1200.When the virtual voltage v1 that detecting voltage unit 1100 detects is less than or equal to predeterminated voltage v0
When, relay 1200 is opened, and first voltage v1 exports from outfan 1002 via relay 1200；When virtual voltage v1 is more than in advance
If during voltage v0, relay 1200 cuts out, first voltage v1 via low pressure difference linearity voltage regulation unit 1300 adjustment after from outfan
1002 outputs.In practical operation, predeterminated voltage v0 is generally electrical equipment 2000 normal work coupling with outfan 1002
Safe voltage value.
In the present embodiment, when virtual voltage v1 is less than or equal to predeterminated voltage v0, detecting voltage unit 1100 can send the
One switching signal responds first switch signal and opens (turn on) to relay 1200, relay 1200；As virtual voltage v1
During more than predeterminated voltage v0, detecting voltage unit 1100 can send second switch signal s2 to relay 1200, relay 1200
Respond second switch signal and close (turn off).
Refer to Fig. 2, Fig. 2 is the block diagram of the second embodiment of power supply circuit of the present invention.With first embodiment
Except for the difference that, in the present embodiment, excess voltage protection 1000 also comprises first switch unit 1400, first switch unit 1400
It is coupled between detecting voltage unit 1100 and relay 1200, be less than when detecting voltage unit 1100 detects virtual voltage v1
During equal to predeterminated voltage v0, detecting voltage unit 1100 sends the first signal s1 to first switch unit 1400, first switch list
Unit 1400 makes relay 1200 open according to the first signal s1；It is more than when detecting voltage unit 1100 detects virtual voltage v1
During predeterminated voltage v0, detecting voltage unit 1100 sends secondary signal s2 to first switch unit 1400, first switch unit
1400 make relay 1200 close according to secondary signal s2.
In the present embodiment, when virtual voltage v1 is less than or equal to predeterminated voltage v0, detecting voltage unit 1100 can send the
To first switch unit 1400, the first signal s1 can be the first low level signal to one signal s1, first switch unit 1400 basis
First low level signal exports the second low level signal to relay 1200, and relay 1200 is opened；When virtual voltage v1 is more than
During predeterminated voltage v0, detecting voltage unit 1100 can send secondary signal s2 to first switch unit 1400, and secondary signal s2 can
For the first high level signal, first switch unit 1400 is according to first high level signal output the second high level signal to relay
1200, relay 1200 cuts out.
As shown in Figures 1 and 2, power supply circuit 100 also comprises battery 1500, and battery 1500 is connected to overvoltage protection
The input 1001 of circuit 1000, the voltage of battery 1500 is inputted from input 1001.In practical application, such as Fig. 1 and Fig. 2
Shown, electrical equipment 2000 is connected to the outfan 1002 of excess voltage protection 1000, in order to be received from overvoltage protection electricity
The voltage of road 1000 output.
Please also refer to Fig. 2 and Fig. 3, Fig. 3 is the local circuit knot of the second embodiment of power supply circuit of the present invention
Composition.In the present embodiment, first switch unit 1400 is mos switch element.As shown in figure 3, first switch unit 1400 comprises
First n-type transistor q29 and the second n-type transistor q30, the grid of the first n-type transistor q29 couples detecting voltage unit 1100
The second end 1102, this second end 1102 be detecting voltage unit 1100 signal output part, the leakage of the first n-type transistor q29
Pole couples the grid of the second n-type transistor q30, the source ground of the first n-type transistor q29；The leakage of the second n-type transistor q30
Pole couples relay 1200, the source ground of the second n-type transistor q30.
When the virtual voltage v1 that detecting voltage unit 1100 detects battery 1500 is less than or equal to predeterminated voltage v0, voltage
Second end 1102 of detecting unit 1100 exports the first low level signal (i.e. the first signal s1), the grid of the first n-type transistor q29
Pole couples the second end 1102, therefore is low level at the grid of the first n-type transistor q29, and the first n-type transistor q29 is closed, and first
The drain electrode of n-type transistor q29 is high level, due to the grid of the second n-type transistor q30 and the drain electrode of the first n-type transistor q29
Couple, therefore be high level at the grid of the second n-type transistor q30, the second n-type transistor q30 is opened, the second n-type transistor q30
Drain electrode be low level, in this, as the second low level signal, due to the drain electrode of relay 1200 and the second n-type transistor q30
Couple, therefore the second low level signal is transferred to relay 1200, relay 1200 opens (turn according to this second low level signal
on).
When the virtual voltage v1 that detecting voltage unit 1100 detects battery 1500 is more than predeterminated voltage v0, detecting voltage
Second end 1102 of unit 1100 exports the first high level signal (i.e. secondary signal s2), the grid coupling of the first n-type transistor q29
Connect the second end 1102, therefore be high level at the grid of the first n-type transistor q29, the first n-type transistor q29 is opened, the first N-shaped
The drain electrode of transistor q29 is low level, due to the grid of the second n-type transistor q30 and the drain electrode coupling of the first n-type transistor q29
Connect, therefore be low level at the grid of the second n-type transistor q30, the second n-type transistor q30 is closed, the second n-type transistor q30
Drain as high level, in this, as the second high level signal, due to the drain electrode coupling of relay 1200 and the second n-type transistor q30
Connect, therefore the second high level signal is transferred to relay 1200, relay 1200 cuts out (turn according to this second high level signal
off).
The power supply circuit of the present invention, (is inputted using the voltage v1 that detecting voltage unit 1100 detects battery 1500
The virtual voltage v1 at end 1001), when the voltage v1 of battery 1500 is less than or equal to predeterminated voltage v0, (usual predeterminated voltage v0 was
Voltage protection value) when, detecting voltage unit 1100 notifies first switch unit 1400 to open relay 1200 or directly notify
Relay 1200 is opened, and the voltage of battery 1500 exports to outfan 1002 via relay 1200, thus reaching electrical equipment
2000.When the voltage v1 of battery 1500 is less than or equal to predeterminated voltage v0, detecting voltage unit 1100 notifies first switch unit
Relay 1200 cuts out or directly notifies relay 1200 to cut out by 1400, and the voltage of battery 1500 is through low pressure difference linearity voltage stabilizing
Unit 1300 reaches electrical equipment after being down to safe voltage value again, thus reaching the purpose of protection electrical equipment 2000.
In practical operation, after relay 1200 is opened, it is equivalent to a short-circuit line, now from battery 1500 output
Electric current all flows through from relay 1200, and low pressure difference linearity voltage regulation unit 1300 is shorted, and does not have electric current steady through low pressure difference linearity
Pressure unit 1300, therefore no longer additionally arrange switch element in the present embodiment individually to control low pressure difference linearity low pressure difference linearity voltage stabilizing
The open circuit of unit 1300 and closed circuit.
In the present embodiment, low pressure difference linearity voltage regulation unit 1300 comprises the first low pressure difference linear voltage regulator (not illustrating).Real
In the operation of border, the size of low pressure difference linearity voltage regulation unit 1300 electric current according to needed for electrical equipment 2000, may be selected to use many
Low pressure difference linear voltage regulator is in parallel.For example, low pressure difference linearity voltage regulation unit 1300 also can comprise the second low pressure difference linear voltage regulator
(not illustrating), the first low pressure difference linear voltage regulator and the second low pressure difference linear voltage regulator are in parallel.Certainly, low pressure difference linear voltage regulator
Number be not limited, and each low pressure difference linear voltage regulator can be selected according to actual needs.
Refer to Fig. 4, Fig. 4 is the partial discharge curve chart of battery in the power supply circuit of the present invention.In the present embodiment
Be using two lead-acid batteries monomer series-connected carrying out specific experiment.General, the overvoltage value of electrical equipment 2000 is 24v,
Its 110% (100%+10%) is 26.4v.As shown in Figure 4, two series connection lead-acid battery elevators after fully charged, its voltage
Be worth for 29.1v, when lead-acid battery comes into operation, its magnitude of voltage from 29.1v (the detecting time is t0, and the concrete detecting time is 8:
54:03) drop to safety value 26v (the detecting time is t1, and the concrete detecting time is 8:55:26) and there are about 83 seconds.Although low voltage difference line
Property voltage regulation unit 1300 efficiency carry out the efficiency of blood pressure lowering not as good as conventional dc-dc transducer in background technology, but master of the present invention
If low pressure difference linearity voltage regulation unit 1300 is used as overvoltage consume protection circuit, using low pressure difference linearity voltage regulation unit 1300
Consume the part (only using the time that battery was less than two minutes) of overvoltage, in remaining working time, almost all of electricity
Pond power supply all exports through relay 1200, and is equivalent to short-circuit line when relay 1200 is opened, and it may be regarded as not consuming electric energy,
Without as in background technology the mode using dc-dc transducer forever have a dead loss (concrete loss regard specific
Depending on converter efficiency), and then extend the use time of battery on the basis of reaching the function of overvoltage protection, and circuit design
Simpler.
The excess voltage protection of the present invention and power supply circuit, detect the actual electricity of battery using detecting voltage unit
Pressure, when the virtual voltage of battery is less than or equal to predeterminated voltage, relay is opened, and the voltage of battery exports to use via relay
Electric equipment.When the virtual voltage of battery is more than predeterminated voltage, cut-off, the voltage of battery is through low pressure difference linearity voltage stabilizing
Unit reaches electrical equipment after being down to safe voltage value again, thus reaching the purpose of protection electrical equipment.Additionally, the present invention will be low
Pressure reduction linear voltage stabilization unit is used as overvoltage and consumes protection circuit, consumes the portion of overvoltage using low pressure difference linearity voltage regulation unit
Point, in remaining working time, almost all of battery supply all exports through relay, and then is reaching the work(of overvoltage protection
Extend the use time of battery on the basis of energy, and circuit design is simpler.
By the above detailed description of preferred embodiments, it is intended to more clearly describe the feature of the present invention and spirit,
And not protection scope of the present invention is any limitation as with above-mentioned disclosed preferred embodiment.On the contrary, its purpose
It is intended to cover being arranged in the scope of the claims that the present invention to be applied for of various changes and tool equality.Cause
This, the apllied scope of the claims of the present invention should make explanation the broadest according to above-mentioned explanation, to cause it
Cover all possible arrangement changing and having equality.
Claims (10)
1. a kind of excess voltage protection, it has input and outfan it is characterised in that comprising:
Detecting voltage unit, is coupled to this input, and this detecting voltage unit is used for detecting the virtual voltage of this input；
Relay, is coupled between this input and this outfan；And
Low pressure difference linearity voltage regulation unit, in parallel with this relay；
Wherein, when this virtual voltage is less than or equal to predeterminated voltage, this relay is opened, and this virtual voltage is via this relay certainly
This outfan exports；When this virtual voltage is more than this predeterminated voltage, this cut-off, this virtual voltage is via this low voltage difference
From the output of this outfan after the adjustment of linear voltage stabilization unit.
2. excess voltage protection according to claim 1 it is characterised in that: when this virtual voltage be less than or equal to this preset
During voltage, this detecting voltage unit sends the first signal to this relay, and this relay is opened according to this first switch signal；When
When this virtual voltage is more than this predeterminated voltage, this detecting voltage unit sends second switch signal to this relay, this relay
Closed according to this secondary signal.
3. excess voltage protection according to claim 1 it is characterised in that: this excess voltage protection also comprises first
Switch element, this first switch unit is coupled between this detecting voltage unit and this relay, when this detecting voltage unit is detectd
When measuring this virtual voltage less than this predeterminated voltage, this detecting voltage unit sends the first signal to this first switch unit, should
First switch unit makes this relay open according to this first signal；When this detecting voltage unit, to detect this virtual voltage big
When this predeterminated voltage, this detecting voltage unit sends secondary signal to this first switch unit, this first switch according to this
Binary signal makes this cut-off.
4. excess voltage protection according to claim 3 it is characterised in that: this first signal be first low level letter
Number, this secondary signal is the first high level signal.
5. excess voltage protection according to claim 4 it is characterised in that: this first switch unit is that mos switch is single
Unit.
6. excess voltage protection according to claim 5 it is characterised in that: this first switch unit comprises the first N-shaped
Transistor and the second n-type transistor, the grid of this first n-type transistor couples the second end of this detecting voltage unit, and this second
Hold the signal output part for this detecting voltage unit, the drain electrode of this first n-type transistor couples the grid of this second n-type transistor
Pole, the drain electrode of this second n-type transistor couples this relay.
7. excess voltage protection according to claim 1 it is characterised in that: this low pressure difference linearity voltage regulation unit comprises
One low pressure difference linear voltage regulator.
8. excess voltage protection according to claim 7 it is characterised in that: this low pressure difference linearity voltage regulation unit also comprises
Second low pressure difference linear voltage regulator, this first low pressure difference linear voltage regulator is in parallel with this second low pressure difference linear voltage regulator.
9. a kind of power supply circuit is it is characterised in that comprise the overvoltage protection electricity as any one of claim 1 to 8
Road.
10. power supply circuit according to claim 9 it is characterised in that: this power supply circuit also comprises battery, should
Battery is connected to this input.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610901224.9A CN106374573A (en) | 2016-10-17 | 2016-10-17 | Overvoltage protection circuit and power supply circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610901224.9A CN106374573A (en) | 2016-10-17 | 2016-10-17 | Overvoltage protection circuit and power supply circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN106374573A true CN106374573A (en) | 2017-02-01 |
Family
ID=57895493
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610901224.9A Pending CN106374573A (en) | 2016-10-17 | 2016-10-17 | Overvoltage protection circuit and power supply circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN106374573A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107947302A (en) * | 2017-12-31 | 2018-04-20 | 重庆海国科技有限公司 | A kind of power circuit of Portable oil filter |
| CN113156205A (en) * | 2020-01-22 | 2021-07-23 | 圣邦微电子（北京）股份有限公司 | Shaping circuit, test board card and test machine |
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| CN105788556A (en) * | 2016-05-20 | 2016-07-20 | 深圳市华星光电技术有限公司 | Overvoltage protection circuit and method and liquid crystal drive circuit |
| CN106558914A (en) * | 2015-09-29 | 2017-04-05 | 鸿富锦精密工业（深圳）有限公司 | Switch controlling device and method |
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| JPH053634A (en) * | 1991-06-27 | 1993-01-08 | Tokyo Electric Co Ltd | Battery charging and discharging circuit |
| CN101071950A (en) * | 2006-05-09 | 2007-11-14 | 罗姆股份有限公司 | Charging circuit, over-voltage protection circuit |
| CN202159993U (en) * | 2011-07-14 | 2012-03-07 | 上海戎讯通信技术有限公司 | Mobile terminal charging control circuit with over voltage protection (OVP) |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107947302A (en) * | 2017-12-31 | 2018-04-20 | 重庆海国科技有限公司 | A kind of power circuit of Portable oil filter |
| CN113156205A (en) * | 2020-01-22 | 2021-07-23 | 圣邦微电子（北京）股份有限公司 | Shaping circuit, test board card and test machine |
| CN113156205B (en) * | 2020-01-22 | 2023-10-13 | 圣邦微电子（北京）股份有限公司 | Shaping circuit, test board card and test machine |
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