CN110048478A - There is the emergency power supply driving circuit of reverse connecting protection - Google Patents
There is the emergency power supply driving circuit of reverse connecting protection Download PDFInfo
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- CN110048478A CN110048478A CN201910321497.XA CN201910321497A CN110048478A CN 110048478 A CN110048478 A CN 110048478A CN 201910321497 A CN201910321497 A CN 201910321497A CN 110048478 A CN110048478 A CN 110048478A
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- circuit
- reverse connecting
- protection
- type field
- effect tube
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- 230000005669 field effect Effects 0.000 claims description 77
- 238000009413 insulation Methods 0.000 claims description 47
- 238000002955 isolation Methods 0.000 claims description 31
- 230000005611 electricity Effects 0.000 claims description 10
- 239000000758 substrate Substances 0.000 claims description 9
- 230000000694 effects Effects 0.000 claims 1
- 238000010586 diagram Methods 0.000 description 10
- 229910001416 lithium ion Inorganic materials 0.000 description 7
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 5
- 238000000034 method Methods 0.000 description 5
- 238000007600 charging Methods 0.000 description 2
- 230000001681 protective effect Effects 0.000 description 2
- 239000004065 semiconductor Substances 0.000 description 2
- TVEXGJYMHHTVKP-UHFFFAOYSA-N 6-oxabicyclo[3.2.1]oct-3-en-7-one Chemical compound C1C2C(=O)OC1C=CC2 TVEXGJYMHHTVKP-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H11/00—Emergency protective circuit arrangements for preventing the switching-on in case an undesired electric working condition might result
- H02H11/002—Emergency protective circuit arrangements for preventing the switching-on in case an undesired electric working condition might result in case of inverted polarity or connection; with switching for obtaining correct connection
- H02H11/003—Emergency protective circuit arrangements for preventing the switching-on in case an undesired electric working condition might result in case of inverted polarity or connection; with switching for obtaining correct connection using a field effect transistor as protecting element in one of the supply lines
-
- 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
- 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
- H02J7/0034—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits using reverse polarity correcting or protecting circuits
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
- Protection Of Static Devices (AREA)
Abstract
The present invention relates to a kind of emergency power supply driving circuits for having reverse connecting protection; including power supply, the first esd protection circuit, high-power drive circuit and emergency circuit; it further include reverse connecting protection isolating device; the reverse connecting protection isolating device and the first esd protection circuit and the first reverse connecting protection of electric power generating composition circuit, the high-power drive circuit and power supply constitute emergency driving circuit by emergency circuit.Since reverse connecting protection isolating device can be built in chip interior using the above scheme; and reverse connecting protection isolating device protects the first esd protection circuit; reverse connecting protection isolating device does not have to the entire load of protection; when there is the case where high current; high current does not flow through reverse connecting protection isolating device; to circuit high efficiency, and reverse connecting protection isolating device size is unrestricted, can be made small.
Description
Technical field
The invention belongs to electronic field more particularly to a kind of emergency power supply driving circuits for having reverse connecting protection.
Background technique
Battery powered product is more and more, and most products do not have reverse connecting protection.And there is generally adopting for reverse connecting protection
Electric power loop is blocked using the one-way conduction characteristic of diode with external diode.The shortcomings that this method, is: 1. power consumptions
Greatly, general diode forward conduction voltage drop is 0.7V, and good conduction voltage drop is also in 0.3V.2. at high cost.3. in low pressure, by
In the influence of forward conduction voltage drop, cause chip effective voltage low, limits the minimum operating voltage of battery.
In number of patent application are as follows: 201621271964.0 denominations of invention are as follows: a kind of game paddle reverse battery protection circuit
And a kind of reverse battery protection circuit is disclosed in the patent of game paddle, the mode which is adopted as external MOS carries out
Isolation.Although the method for external MOS, which can partially make up external diode design, leads to power consumption problems of too, once need
High current power supply, the requirement to the conducting resistance of MOS are very harsh.And the pipe for being loaded with high current must be accomplished outside chip
Face.In addition, then needing to flow through very big electric current since discharge current is big on metal-oxide-semiconductor or diode, causing power consumption big.Cause energy
The waste in source, while battery cannot make the best use of everything.Limit the minimum operating voltage of battery.Emergency power supply driving side as shown in figure 1
Case carries out lithium ion battery protection due to needing to detect the state of lithium ion battery.It also needs to carry out judgement AC power supplies simultaneously
State, if AC power supplies short circuit or at low-resistivity (< 2Mohm), light emergency LED particle.Due to power supply class driving circuit
It has required high-power electric current and has flowed through driving chip, meanwhile, energy-efficient market demands battery high efficiency as far as possible is badly in need of one kind and is changed
Into the chip method of such simple external protection circuit.
Summary of the invention
It is an object of the invention to propose a kind of emergency power supply driving circuit for having reverse connecting protection, reverse connecting protection isolating device
It can be built in chip interior, and provide reverse connecting protection to the first esd protection circuit.
Implementer's case of the invention is: having the emergency power supply driving circuit of reverse connecting protection, including power supply, the first ESD
Circuit, high-power drive circuit and emergency circuit are protected, further includes reverse connecting protection isolating device, the reverse connecting protection isolating device
With the first esd protection circuit and the first reverse connecting protection of electric power generating composition circuit, the high-power drive circuit and power supply pass through institute
It states emergency circuit and constitutes emergency driving circuit.
Based on above-mentioned purpose, further improvement of the present invention scheme is: further including battery protection and battery powered inside
Module, the battery protection and battery powered internal module are parallel to the both ends of the first esd protection circuit.
Based on above-mentioned purpose, further improvement of the present invention scheme is: further including the second esd protection circuit, inside VDD hair
Raw circuit, over-discharge protection circuit and overcharge protection circuit, second esd protection circuit occur circuit with inside VDD and are in parallel
And with the reverse connecting protection isolating device, over-discharge protection circuit, overcharge protection circuit, the second reverse connecting protection of electric power generating composition circuit.
Based on above-mentioned purpose, further improvement of the present invention scheme is: further including voltage-multiplying circuit, the internal VDD occurs
The output of circuit is connected to the input terminal of the voltage-multiplying circuit, and the output of the voltage-multiplying circuit is connected to the high-power driving electricity
The control terminal on road.
Based on above-mentioned purpose, further improvement of the present invention scheme is: the high-power drive circuit includes the 4th N-channel
The drain electrode of reinforced insulation grid-type field-effect tube, the 4th N-channel reinforced insulation grid-type field-effect tube is connected to positive pole,
The grid of the 4th N-channel reinforced insulation grid-type field-effect tube is connected to voltage-multiplying circuit output end, the 4th N-channel enhancing
The source electrode of type insulating gate type field effect tube is connected to the input terminal of emergency circuit.
Based on above-mentioned purpose, further improvement of the present invention scheme is: further including that substrate selects low potential circuit, the substrate
Low potential circuit is selected to be in parallel with the high-power drive circuit.
Based on above-mentioned purpose, further improvement of the present invention scheme is: the reverse connecting protection isolating device includes the 2nd P ditch
The drain electrode of road reinforced insulation grid-type field-effect tube, the second P-channel enhancement type insulating gate type field effect tube is connected to power supply
The grid of anode, the second P-channel enhancement type insulating gate type field effect tube is connected to power cathode through the first ESD resistance, described
The source electrode of second P-channel enhancement type insulating gate type field effect tube is connected with body electrode and is connected to first esd protection circuit
One end, described the another of first esd protection circuit are connected to power cathode.
Based on above-mentioned purpose, further improvement of the present invention scheme is: the reverse connecting protection isolating device includes first
Reverse connecting protection isolation circuit and the second reverse connecting protection isolation circuit, first esd protection circuit 104 and the first reverse connecting protection every
Constitute the first reverse connecting protection circuit from circuit and battery, second esd protection circuit and inside VDD generation circuit be in parallel and
The second reverse connecting protection circuit is constituted with the second reverse connecting protection isolation circuit, overcharge protection circuit, over-discharge protection circuit, battery, the
One reverse connecting protection isolation circuit include the 6th N-channel reinforced insulation grid-type field-effect tube, the one of first esd protection circuit
It is connected to anode, the another of first esd protection circuit is connected to the 6th N-channel reinforced insulation grid-type field-effect tube
Drain electrode, the grid of the 6th N-channel reinforced insulation grid-type field-effect tube is connected to anode, the 6th N ditch through the 3rd ESD resistance
The source electrode of road reinforced insulation grid-type field-effect tube is connected with body electrode and is connected to the cathode of battery；Second reverse connecting protection isolation electricity
Road includes the 7th N-channel reinforced insulation grid-type field-effect tube, and an end of the second esd protection circuit is connected to anode, another
It is connected to the drain electrode of the 7th N-channel reinforced insulation grid-type field-effect tube, the 7th N-channel reinforced insulation grid-type field-effect tube
Grid is connected to anode through the 4th ESD resistance, and the source electrode of the 7th N-channel reinforced insulation grid-type field-effect tube is connected to electrically
And be connected with overcharge protection circuit one end, the another of overcharge protection circuit is connected to over-discharge protection circuit one end, Cross prevention electricity
The another of road is connected to battery cathode.
Based on above-mentioned purpose, further improvement of the present invention scheme is: the reverse connecting protection isolating device includes first
Reverse connecting protection isolation circuit and the second reverse connecting protection isolation circuit, first esd protection circuit 104 and the first reverse connecting protection every
Constitute the first reverse connecting protection circuit from circuit and battery, second esd protection circuit and inside VDD generation circuit be in parallel and
The second reverse connecting protection circuit is constituted with the second reverse connecting protection isolation circuit, overcharge protection circuit, over-discharge protection circuit, battery, the
One reverse connecting protection isolation circuit include the 6th N-channel reinforced insulation grid-type field-effect tube, the one of first esd protection circuit
It is connected to anode, the another of first esd protection circuit is connected to the 6th N-channel reinforced insulation grid-type field-effect tube
Drain electrode, the grid of the 6th N-channel reinforced insulation grid-type field-effect tube is connected to anode, the 6th N ditch through the 3rd ESD resistance
The source electrode of road reinforced insulation grid-type field-effect tube is connected with body electrode and is connected to the cathode of battery；Second reverse connecting protection
Isolation circuit includes the 8th P-channel enhancement type insulating gate type field effect tube Q8, the 8th P-channel enhancement type insulating gate type field effect tube
The drain electrode of Q8 is connected with body electrode and is connected to the anode of battery, the source electrode of the 8th P-channel enhancement type insulating gate type field effect tube Q8
It is connected to the second esd protection circuit, the grid of the 8th P-channel enhancement type insulating gate type field effect tube Q8 is connected to through the 5th ESD resistance
Electrically.
Beneficial effect
The present invention since reverse connecting protection isolating device using the above scheme can be built in chip interior, and reverse connecting protection every
From the first esd protection circuit of unit protection, reverse connecting protection isolating device does not have to the entire load of protection, when there is the case where high current,
High current does not flow through reverse connecting protection isolating device, thus circuit high efficiency, and reverse connecting protection isolating device size is unrestricted,
It can be made small.
Detailed description of the invention:
Fig. 1 is prior art circuits schematic diagram；
Fig. 2 is the circuit block diagram of one reverse-connection protection circuit of the embodiment of the present invention；
Fig. 3 is that one reverse-connection protection circuit of the embodiment of the present invention refines circuit block diagram；
Fig. 4 is the circuit block diagram of two reverse-connection protection circuit of the embodiment of the present invention；
Fig. 5 is that two reverse-connection protection circuit of the embodiment of the present invention refines circuit block diagram；
Fig. 6 is the emergency power supply driving circuit circuit block diagram that the present invention has reverse connecting protection；
Fig. 7 is the emergency power supply driving circuit equivalent circuit diagram for having reverse connecting protection when battery of the present invention is reversely connected；
Fig. 8 is the emergency power supply driving circuit block diagram that the embodiment of the present invention four has reverse connecting protection；
Fig. 9 is the emergency power supply driving circuit block diagram that the embodiment of the present invention five has reverse connecting protection.
Specific embodiment:
It is below in conjunction with attached drawing and specifically real in order to be more clear principle and the advantage of the purpose of the present invention, technical solution
Scheme is applied, the present invention will be described in further detail.In the present embodiment, described specific embodiment is only used to
It explains the present invention, is not intended to limit the present invention.
Embodiment one
As shown in Fig. 2, Fig. 3 and Fig. 6, there are the emergency power supply driving circuit of reverse connecting protection, including power supply, the first ESD protection
Circuit 104, high-power drive circuit and emergency circuit, the power supply are battery, further include reverse connecting protection isolating device, the electricity
The anode in pond 101 is connected to reverse connecting protection isolating device, and reverse connecting protection isolating device is connected to the first esd protection circuit 104, and first
Esd protection circuit 104 is connected to power cathode 115, the reverse connecting protection isolating device and the first esd protection circuit 104 and battery
101 constitute the first reverse connecting protection circuit, and the high-power drive circuit and battery 101 constitute emergency driving by emergency circuit
Circuit.The reverse connecting protection isolating device is the second P-channel enhancement type insulating gate type field effect tube Q2, and second P-channel increases
The drain electrode of strong type insulating gate type field effect tube Q2 is connected to the anode of battery 101, the second P-channel enhancement type insulating gate type field effect tube
The grid of Q2 is connected to power cathode 115, the source of the second P-channel enhancement type insulating gate type field effect tube Q2 through the first ESD resistance 103
Pole is connected with body electrode and as internal electric source output end and is connected to one end of the first esd protection circuit 104, the first ESD protection
The another of circuit 104 is connected to power cathode 115.
Embodiment two
As shown in Fig. 4 to Fig. 5, there is an emergency power supply driving circuit of reverse connecting protection, including battery, the first esd protection circuit,
High-power drive circuit and emergency circuit, further include reverse connecting protection isolating device, and the anode of the battery is connected to the first ESD protection
Circuit on one side, the first esd protection circuit is another to be connected to reverse connecting protection isolating device one end, reverse connecting protection isolating device it is another
It is connected to battery cathode, first esd protection circuit, reverse connecting protection isolating device and battery constitute the first reverse connecting protection and return
Road, the high-power drive circuit and battery constitute emergency driving circuit by emergency circuit.The reverse connecting protection isolation dress
It sets including the 5th N-channel reinforced insulation grid-type field-effect tube Q5, the grid of the 5th N-channel reinforced insulation grid-type field-effect tube Q5
The 2nd ESD resistance of pole is connected to anode, and the drain electrode of the 5th N-channel reinforced insulation grid-type field-effect tube Q5 is connected to first
The other end of esd protection circuit, the source electrode and body electrode of the 5th N-channel reinforced insulation grid-type field-effect tube Q5 are connected to battery
Cathode.
Embodiment three
As shown in fig. 6, there is the emergency power supply driving circuit of reverse connecting protection, including battery, reverse connecting protection isolating device 102,
First esd protection circuit 104, battery protection and battery powered internal module 105, the second esd protection circuit 106, inside VDD
Circuit 107, over-discharge protection circuit 112 and overcharge protection circuit 113, voltage-multiplying circuit 109, high-power drive circuit 110, lining occurs
Low potential circuit 111 and emergency circuit 114 are selected in bottom, and the anode of the battery 101 is connected to reverse connecting protection isolating device 102, reversal connection
Protective separation device 102 is connected to the first esd protection circuit 104, and the first esd protection circuit 104 is connected to power cathode 115, described
Reverse connecting protection isolating device 102 and the first esd protection circuit 10 and battery 101 constitute the first reverse connecting protection circuit, and described is big
Power driving circuit and battery 101 pass through emergency circuit composition emergency driving circuit.The reverse connecting protection isolating device 102 is the
Two P-channel enhancement type insulating gate type field effect tube Q2, the drain electrode of the second P-channel enhancement type insulating gate type field effect tube Q2 connect
To the anode of battery 101, the grid of the second P-channel enhancement type insulating gate type field effect tube Q2 is connected to electricity through the first ESD resistance 103
The source electrode of source cathode 115, the second P-channel enhancement type insulating gate type field effect tube Q2 is connected and as internal electric source with body electrode
Another power supply that is connected to of 108 output ends and the one end for being connected to the first esd protection circuit 104, the first esd protection circuit 104 is born
Pole 115.The battery protection and battery powered internal module 105 are parallel to the both ends of the first esd protection circuit 104.It is described
Second esd protection circuit 106 be in parallel with inside VDD generation circuit 107 and with reverse connecting protection isolating device 102, overcharge protection
Circuit 113, over-discharge protection circuit 112, battery 101 constitute the second reverse connecting protection circuit., the second P-channel enhancement type insulated-gate type
The source electrode and body electrode of field-effect tube Q2 is connected and is connected to the second esd protection circuit 106 and be connected with inside VDD generation circuit 107
Circuit 1074 occur for one end, the second esd protection circuit 106 and inside VDD are connected another to be connected to 113 one end of overcharge protection circuit
And be connected with electrically 116, overcharge protection circuit 113 is another to be connected to 112 one end of over-discharge protection circuit, over-discharge protection circuit
112 another are connected to battery cathode 115.The output that circuit 107 occurs for internal VDD is connected to the input terminal of voltage-multiplying circuit 109, times
The output of volt circuit 109 is connected to the control terminal of high-power drive circuit 110, and the substrate selects low potential circuit 111 and big function
Rate driving circuit 110 is in parallel.The high-power drive circuit includes the 4th N-channel reinforced insulation grid-type field-effect tube Q4,
The drain electrode of the 4th N-channel reinforced insulation grid-type field-effect tube Q4 is connected to positive pole, the 4th N-channel reinforced insulation grid
The grid of type field-effect tube is connected to voltage-multiplying circuit output end, and the source electrode of the 4th N-channel reinforced insulation grid-type field-effect tube Q4 connects
To the input terminal of emergency circuit 114.
Example IV
As shown in figure 8, with embodiment three the difference is that: the reverse connecting protection isolating device include first reversal connection protect
Protect isolation circuit and the second reverse connecting protection isolation circuit, first esd protection circuit 104 and the first reverse connecting protection isolation circuit
The first reverse connecting protection circuit is constituted with battery 101,107 phase of circuit occurs for second esd protection circuit 106 simultaneously with inside VDD
Join and constitutes second instead with the second reverse connecting protection isolation circuit, overcharge protection circuit 113, over-discharge protection circuit 112, battery 101
Connect protective loop.First reverse connecting protection isolation circuit includes the 6th N-channel reinforced insulation grid-type field-effect tube Q6, and described first
One end of esd protection circuit 104 is connected to anode, and the another of first esd protection circuit 104 is connected to the 6th N-channel
The drain electrode of reinforced insulation grid-type field-effect tube Q6, the grid of the 6th N-channel reinforced insulation grid-type field-effect tube Q6 is through third
ESD resistance 1031 is connected to anode, the source electrode of the 6th N-channel reinforced insulation grid-type field-effect tube Q6 be connected with body electrode and
It is connected to the cathode of battery 101.Second reverse connecting protection isolation circuit includes the 7th N-channel reinforced insulation grid-type field-effect tube Q7,
One end of the second esd protection circuit 106 is connected to anode, another to be connected to the 7th N-channel reinforced insulation grid-type field-effect
The grid of the drain electrode of pipe Q7, the 7th N-channel reinforced insulation grid-type field-effect tube Q7 is connected to anode through the 4th ESD resistance,
The source electrode of 7th N-channel reinforced insulation grid-type field-effect tube Q7 be connected to electrically 116 and with 113 one end phase of overcharge protection circuit
Even, the another of overcharge protection circuit 113 is connected to 112 one end of over-discharge protection circuit, and the another of over-discharge protection circuit 112 is connected to
Battery cathode 115.
Embodiment five
As shown in figure 9, the difference is that, the second reverse connecting protection isolation circuit includes the 8th P with example IV
Channel enhancement insulating gate type field effect tube Q8, the drain electrode of the 8th P-channel enhancement type insulating gate type field effect tube Q8 and body electrode
It is connected and is connected to the anode of battery, the source electrode of the 8th P-channel enhancement type insulating gate type field effect tube Q8 is connected to the 2nd ESD protection electricity
Circuit 107 occurs for road 106 and inside VDD, and the grid of the 8th P-channel enhancement type insulating gate type field effect tube Q8 is through the 5th ESD electricity
Resistance is connected to electrically.
The target application of the design be emergency LED driving circuit, the present invention only with regard to its cell anti-reverse connect protection part into
Row explanation.
116 pairs by 101 positive terminal of battery and electrically battery chargings of external power supply, overcharge, over-discharge protection circuit protection
Battery, and battery charging and discharging is managed.
102 are reversely connected voltage clamping pipe for battery control section, and 103 be the first ESD resistance, and the first esd protection circuit 104 is
Battery protection and the ESD protection of battery powered internal module part protect battery protection and battery powered internal module
105,105 be battery protection and battery powered internal module.112 be over-discharge protection circuit, and 113 be overcharge protection circuit, 112
And 113 be serially connected between battery cathode end 115 and electrically 116.115 be the negative pole end of battery, while being also the first ESD protection
Circuit 104 and battery protection and battery powered internal module 105 are electrically.Electrically 116 be the second esd protection circuit
106, the electricity that circuit 107, voltage-multiplying circuit 109, high-power drive circuit 110, substrate select low potential circuit 111 occurs for inside VDD
Learn ground.Second esd protection circuit 106 is the ESD protection being connected across between internal electric source 108 and electrically 116, and protection is internal
VDD occurs circuit 107, voltage-multiplying circuit 109, high-power drive circuit 110 and substrate and low potential circuit 111 is selected not broken by electrostatic
It is bad.107 be internal VDD generation circuit, and the voltage of high pressure is converted to low pressure workable for chip interior.This voltage is supplied to again
Volt circuit 109 generates the voltage for being higher than one times of 114 voltage of load, for driving high-power drive circuit 110.Due to load 114
Current potential in system application process may external other driving, and generate the positive terminal for being higher than high-power drive circuit 110
Current potential, therefore low potential selection circuit, that is, substrate is added and selects low potential circuit 111, it is ensured that the substrate diode of metal-oxide-semiconductor will not be different
Often conducting.
As shown in fig. 7, for when battery is reversely connected generation, with reference to equivalent circuit diagram, from Fig. 7, it can be seen that battery 101
It is reversely connected in reversal connection battery 201, but the second P-channel enhancement type insulating gate type field effect tube 102 is equivalent to the in Fig. 7
One diode 202, by the current path flowed out from reversal connection 201 lithium ion cell positive end of battery.Over-discharge protection circuit 112
It is equivalent to the first equivalent switch 207 and the second equivalent switch 208 respectively with overcharge protection circuit 113, due to lithium ion battery pipe
Reason is partially due to the reversal connection of lithium ion battery causes first esd protection circuit of partial circuit 104 and battery protection and battery to supply
Electricity internal module 105 be equivalent to the second diode and third diode 203, i.e., at this time approximation circuit floating in lithium ion battery
Positive point on, although therefore 112 switching tube of over-discharge protection circuit close, the conducting of body knot is equivalent to first and equivalent opens
Close 207.113 is in the conductive state at this moment, is equivalent to the second equivalent switch 208.Light-emitting LED pipe is loaded due to reversely by work
201 anode of battery is reversely connected to the access between cathode with having blocked.No matter the third equivalent of high-power drive circuit 110 is opened at this time
Close whether 205 be connected, the access of lithium ion cell positive to the cathode of reversal connection is blocked.
Use above specific case is illustrated the present invention, is merely used to help understand the present invention, not to limit
The system present invention.For those skilled in the art, according to the thought of the present invention, can also make several simple
It deduces, deform or replaces.
Claims (9)
1. there is the emergency power supply driving circuit of reverse connecting protection, including power supply, the first esd protection circuit, high-power drive circuit and
Emergency circuit, it is characterised in that: further include reverse connecting protection isolating device, the reverse connecting protection isolating device and the first ESD are protected
Circuit and the first reverse connecting protection of electric power generating composition circuit, the high-power drive circuit are made up of with power supply the emergency circuit
Emergency driving circuit.
2. the emergency power supply driving circuit according to claim 1 for having reverse connecting protection, it is characterised in that: further include that battery is protected
Shield and battery powered internal module, the battery protection and battery powered internal module are parallel to the first esd protection circuit
Both ends.
3. the emergency power supply driving circuit according to claim 2 for having reverse connecting protection, it is characterised in that: further include second
Circuit, over-discharge protection circuit and overcharge protection circuit occur for esd protection circuit, inside VDD, second esd protection circuit with
Internal VDD occur circuit be in parallel and with the reverse connecting protection isolating device, over-discharge protection circuit, overcharge protection circuit, power supply
Constitute the second reverse connecting protection circuit.
4. the emergency power supply driving circuit according to claim 3 for having reverse connecting protection, it is characterised in that: further include a times piezoelectricity
Road, the output that circuit occurs for the internal VDD are connected to the input terminal of the voltage-multiplying circuit, the output termination of the voltage-multiplying circuit
To the control terminal of the high-power drive circuit.
5. the emergency power supply driving circuit according to claim 4 for having reverse connecting protection, it is characterised in that: the high-power drive
Dynamic circuit includes the 4th N-channel reinforced insulation grid-type field-effect tube, the 4th N-channel reinforced insulation grid-type field-effect tube
Drain electrode be connected to positive pole, the grid of the 4th N-channel reinforced insulation grid-type field-effect tube is connected to voltage-multiplying circuit output
End, the source electrode of the 4th N-channel reinforced insulation grid-type field-effect tube are connected to the input terminal of emergency circuit.
6. the emergency power supply driving circuit according to claim 5 for having reverse connecting protection, it is characterised in that: further include substrate choosing
Low potential circuit, the substrate select low potential circuit to be in parallel with the high-power drive circuit.
7. according to claim 1 to the emergency power supply driving circuit for having reverse connecting protection described in any one of 6 claims,
Be characterized in that: the reverse connecting protection isolating device includes the second P-channel enhancement type insulating gate type field effect tube, the 2nd P ditch
The drain electrode of road reinforced insulation grid-type field-effect tube is connected to the anode of power supply, the second P-channel enhancement type insulated-gate type field effect
Should the grid of pipe be connected to power cathode, the source electrode of the second P-channel enhancement type insulating gate type field effect tube through the first ESD resistance
It is connected and is connected to one end of first esd protection circuit with body electrode, described the another of first esd protection circuit is connected to electricity
Source cathode.
8. the emergency power supply driving circuit according to claim 3 for having reverse connecting protection, it is characterised in that: the reversal connection is protected
Protecting isolating device includes the first reverse connecting protection isolation circuit and the second reverse connecting protection isolation circuit, first esd protection circuit
104 and first reverse connecting protection isolation circuit and battery constitute the first reverse connecting protection circuit, second esd protection circuit and internal
VDD occurs circuit and is in parallel and constitutes with the second reverse connecting protection isolation circuit, overcharge protection circuit, over-discharge protection circuit, battery
Second reverse connecting protection circuit, the first reverse connecting protection isolation circuit includes the 6th N-channel reinforced insulation grid-type field-effect tube, described
One end of the first esd protection circuit is connected to anode, and the another of first esd protection circuit is connected to the increasing of the 6th N-channel
The drain electrode of strong type insulating gate type field effect tube, the grid of the 6th N-channel reinforced insulation grid-type field-effect tube is through the 3rd ESD resistance
It is connected to anode, the source electrode of the 6th N-channel reinforced insulation grid-type field-effect tube is connected with body electrode and is connected to the negative of battery
Pole；Second reverse connecting protection isolation circuit includes the 7th N-channel reinforced insulation grid-type field-effect tube, the second esd protection circuit
One end is connected to anode, another drain electrode for being connected to the 7th N-channel reinforced insulation grid-type field-effect tube, and the 7th N-channel increases
The grid of strong type insulating gate type field effect tube is connected to anode, the 7th N-channel reinforced insulation grid-type field through the 4th ESD resistance
The source electrode of effect pipe is connected to electrically and is connected with overcharge protection circuit one end, and the another of overcharge protection circuit is connected to over-discharge guarantor
Protection circuit one end, the another of over-discharge protection circuit are connected to battery cathode.
9. the emergency power supply driving circuit according to claim 3 for having reverse connecting protection, it is characterised in that: the reversal connection is protected
Protecting isolating device includes the first reverse connecting protection isolation circuit and the second reverse connecting protection isolation circuit, first esd protection circuit
104 and first reverse connecting protection isolation circuit and battery constitute the first reverse connecting protection circuit, second esd protection circuit and internal
VDD occurs circuit and is in parallel and constitutes with the second reverse connecting protection isolation circuit, overcharge protection circuit, over-discharge protection circuit, battery
Second reverse connecting protection circuit, the first reverse connecting protection isolation circuit includes the 6th N-channel reinforced insulation grid-type field-effect tube, described
One end of the first esd protection circuit is connected to anode, and the another of first esd protection circuit is connected to the increasing of the 6th N-channel
The drain electrode of strong type insulating gate type field effect tube, the grid of the 6th N-channel reinforced insulation grid-type field-effect tube is through the 3rd ESD resistance
It is connected to anode, the source electrode of the 6th N-channel reinforced insulation grid-type field-effect tube is connected with body electrode and is connected to the negative of battery
Pole；The second reverse connecting protection isolation circuit includes the 8th P-channel enhancement type insulating gate type field effect tube Q8, the 8th P-channel
The drain electrode of reinforced insulation grid-type field-effect tube Q8 is connected with body electrode and is connected to the anode of battery, and the 8th P-channel enhancement type is exhausted
The source electrode of edge grid-type field-effect tube Q8 is connected to the second esd protection circuit, the 8th P-channel enhancement type insulating gate type field effect tube Q8's
Grid is connected to electrically through the 5th ESD resistance.
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| CN110048478B (en) | 2024-05-17 |
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