CN209217948U - A kind of DC-DC circuit and device with over-voltage protecting function - Google Patents
A kind of DC-DC circuit and device with over-voltage protecting function Download PDFInfo
- Publication number
- CN209217948U CN209217948U CN201822144532.9U CN201822144532U CN209217948U CN 209217948 U CN209217948 U CN 209217948U CN 201822144532 U CN201822144532 U CN 201822144532U CN 209217948 U CN209217948 U CN 209217948U
- Authority
- CN
- China
- Prior art keywords
- module
- voltage
- boost
- resistance
- control
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Landscapes
- Dc-Dc Converters (AREA)
Abstract
The utility model discloses a kind of DC-DC circuit and device with over-voltage protecting function; the DC-DC circuit includes filter module, boost module, control module, detection module and protective module; input dc power is exported after filter module is filtered to boost module; the control module output drive signal driving boost module is opened, and the direct current exports after boost module boosting to protective module；The protective module exports the first feedback voltage to control module after being sampled partial pressure to the output voltage of the boost module; when the output voltage of the boost module is greater than the first predeterminated voltage; the control module controls the detection module open circuit; so that first feedback voltage is greater than the second predeterminated voltage; and then the control module stops output drive signal; the boost module is controlled to stop working; to ensure that the output voltage of power supply constant-current circuit is run within the scope of safe clearance, it is ensured that power good operation.
Description
Technical field
The utility model relates to power protection field, in particular to a kind of DC-DC electricity with over-voltage protecting function
Road and device.
Background technique
As performance requirement of the people to product is higher and higher, troxerutine tabtets are increasingly by the attention of the majority of consumers.
The development of science and technology has also pushed TV to intelligentized forward position highland, and smart television is equipped with the intelligence of high performance chips and exploitation
Operating system, the video and audio terminal application platform that home audio-visual, the functions such as amusement, study, life auxiliary are become one.And
Energy supply end of the TV power supply as television set, stable operation are to guarantee that all functions of TV show in front of the user
Precondition.
Existing electronic product or industrial products have use ' Boost Boost topology ', and in power supply constant current part
Boost boost DC-DC device set by over-pressure safety device structure is complicated and can not be according to the spirit of the product of practical application
Setting over-voltage protection point living, so that the application of corresponding over-pressure safety device has some limitations.And in practical application
When also only the output voltage of guaranteed power supply constant-current circuit is run in safe range, can guarantee the safety of power work
Property.
Thus the prior art could be improved and improve.
Utility model content
Place in view of above-mentioned deficiencies of the prior art, the purpose of this utility model is to provide one kind to have overvoltage protection function
The DC-DC circuit and device, the DC-DC circuit with over-voltage protecting function of energy can efficiently solve power supply constant current part
The existing security risk in output voltage fluctuation or output voltage over-voltage, and then ensure that power good is run, and circuit
Structure is simple, reduces power supply cost.
In order to achieve the above object, the utility model takes following technical scheme:
A kind of DC-DC circuit with over-voltage protecting function, including filter module, boost module, control module, detection mould
Block and protective module, input dc power are exported after filter module is filtered to boost module, the control module
Output drive signal drives boost module to open, and the direct current exports after boost module boosting to protective module；Institute
It states protective module the output voltage of the boost module is sampled after partial pressure and export the first feedback voltage to control module, when
When the output voltage of the boost module is greater than the first predeterminated voltage, the control module controls the detection module open circuit, makes
First feedback voltage is greater than the second predeterminated voltage, and then the control module stops output drive signal, described in control
Boost module stops working.
In the DC-DC circuit, the protective module includes protection location and voltage sampling unit, is adopted by the voltage
Sample unit exports the first feedback voltage to control module after being sampled partial pressure to the output voltage of the boost module；When described
When detection module is opened a way, the protection location is connected so that first feedback voltage is greater than the second predeterminated voltage.
In the DC-DC circuit, the control module includes control chip, the 9th foot of the control chip and detection
Module, voltage sampling unit are connected with protection location, the 10th foot and protection location and voltage sampling unit of the control chip
Connection, the 24th foot and the 23rd foot of the control chip are connect with boost module.
In the DC-DC circuit, the boost module includes boosting unit, switch unit and rectification unit, by described
The conducting of control module control switch unit is with closing so that the boosting unit repeated charge completes the liter of the direct current
Journey is pressed through, and is exported after carrying out rectification processing to the direct current by the rectification unit to protective module.
In the circuit, the detection module includes first capacitor, and one end of the first capacitor connects protective module
And control module, the other end ground connection of the first capacitor.
In the DC-DC circuit, the protection location includes triode, the base stage connecting detection mould of the triode
The collector of block, control module and voltage sampling unit, the triode connects voltage sampling unit, the transmitting of the triode
Pole connects voltage sampling unit and control module.
In the DC-DC circuit, the voltage sampling unit includes first resistor, second resistance, 3rd resistor, the 4th
Resistance, the 5th resistance, the 6th resistance and the second capacitor, one end connection LED+ signal end and boost module of the first resistor,
The other end of the first resistor connects one end of 3rd resistor, one end of the 4th resistance and protection location by second resistance,
The other end of the 3rd resistor connects protection location, detection module and control module, the other end of the 4th resistance and passes through
5th resistance connects the one end, protection location and control module of one end of the 6th resistance, the second capacitor, the 6th resistance it is another
The other end of one end and the second capacitor is grounded.
In the DC-DC circuit, the boosting unit includes boost inductance, and the 1st foot of the boost inductance connects filter
Wave module, the 2nd foot, the 3rd foot and the 4th foot of the boost inductance are all connected with switch unit and rectification unit.
In the DC-DC circuit, the switch unit includes the 7th resistance, the 8th resistance, first diode and MOS
One end of pipe, the cathode of the first diode and the 8th resistance passes through the 7th resistance link control module, the 8th resistance
The other end and first diode anode connection metal-oxide-semiconductor grid, the source electrode link control module of the metal-oxide-semiconductor, the MOS
The drain electrode connection boosting unit and rectification unit of pipe.
A kind of DC-DC device with over-voltage protecting function, including DC-DC circuit as described above.
Compared to the prior art, the DC-DC circuit and device provided by the utility model with over-voltage protecting function, it is described
DC-DC circuit includes filter module, boost module, control module, detection module and protective module, and input dc power is by filtering
Output to boost module, the control module output drive signal driving boost module is opened after module is filtered, institute
Direct current is stated to export after boost module boosting to protective module；Output electricity of the protective module to the boost module
Pressure exports the first feedback voltage to control module, when the output voltage of the boost module is greater than first in advance after being sampled partial pressure
If when voltage, the control module controls the detection module open circuit, so that first feedback voltage is greater than the second default electricity
Pressure, and then the control module stops output drive signal, controls the boost module and stops working, to ensure that power supply perseverance
The output voltage of current circuit is run within the scope of safe clearance, it is ensured that power good operation.
Detailed description of the invention
Fig. 1 is the structural block diagram of the DC-DC circuit provided by the utility model with over-voltage protecting function；
Fig. 2 be the DC-DC circuit provided by the utility model with over-voltage protecting function in filter module, boost module,
The circuit diagram of energy-storage module, detection module and protective module；
Fig. 3 is the circuit theory of control module in the DC-DC circuit provided by the utility model with over-voltage protecting function
Figure.
Specific embodiment
The utility model provides a kind of DC-DC circuit and device with over-voltage protecting function, described to have overvoltage protection
The DC-DC circuit of function can efficiently solve power supply constant current part to be existed in output voltage fluctuation or output voltage over-voltage
Security risk, and then ensure that power good is run, and circuit structure is simple, reduces power supply cost.
To keep the purpose of this utility model, technical solution and effect clearer, clear, develop simultaneously implementation referring to the drawings
The utility model is further described in example.It should be appreciated that specific embodiment described herein is only practical to explain
It is novel, it is not used to limit the utility model.
A kind of DC-DC circuit and device with over-voltage protecting function provided by the utility model can be applicable to multi-field
On different product power supply, such as TV set power, refrigerator power, air-conditioning, computer and security product etc. field, effectively mention
The high safe and stable property of power-supply system, reduces cost.
Referring to Fig. 1, the DC-DC circuit provided by the utility model with over-voltage protecting function, including control module
100, boost module 110, filter module 120, energy-storage module 130, detection module 140 and protective module 150, the filter module
120 connection boost modules 110, the boost module 110 connect energy-storage module 130, protective module 150 and control module 100, institute
It states energy-storage module 130 and is also connected with detection module 140, the detection module 140 is also connected with protective module 150 and control module 100；
Input dc power is exported after filter module 120 is filtered to boost module 110, and the control module 100 exports
Driving signal drives boost module 110 to open, and the direct current exports after the boost module 110 boosting to energy-storage module
130 and protective module 150；The protective module 150 exports after the output voltage of the boost module 110 is sampled partial pressure
First feedback voltage is controlled to control module 100 when the output voltage of the boost module 110 is greater than the first predeterminated voltage
The detection module 140 is opened a way, so that the first feedback voltage that the protective module 150 exports is greater than the second predeterminated voltage, into
And the control module 100 closes and stops output drive signal, controls the boost module 110 and stops working.
When boost module 110 works normally, boost module 110 is driven by 100 output drive signal of control module
Opening work increases the voltage of direct current, and the boost module 110 extremely stores up the direct current electricity output after the boosting later
Energy module 130 carries out being stored as back-end circuit power supply, meanwhile, the protective module 150 electricity defeated by sampling boost module 110
Be pressed into and export the first feedback voltage to control module 100 so that 100 normal control boost module 110 of the control module into
The normal work of row.And when the output voltage of the boost module 110 is different greater than the first predeterminated voltage or power-supply system work
Chang Shi triggers the connection of the detection module 140 disconnection and ground that connect with control module 100, so that the protective module 150
First feedback voltage of output is greater than the second predeterminated voltage, when the control module 100 receives the exception feedback voltage at this time
It remains off, stopping output drive signal to boost module 110, and then controls the boost module 110 and stop working, make
It obtains power-supply system to close, and then efficiently solves power supply constant current part and exist in output voltage fluctuation or output voltage over-voltage
Security risk, it is ensured that power good operation.Preferably, first predeterminated voltage is 70V.Second predeterminated voltage is 3V.
Specifically, described referring to Fig. 2, the protective module 150 includes protection location 151 and voltage sampling unit 152
Voltage sampling unit 152 is connect with boost module 110, energy-storage module 130 and protection location 151, the protection location 151 also with
Control module 100 connects；Partial pressure is sampled by output voltage of the voltage sampling unit 152 to the boost module 110
After export the first feedback voltage to control module 100；When detection module open circuit, the protection location conducting is so that described
First feedback voltage is greater than the second predeterminated voltage.
When the boost module 110 works normally, output electricity of the voltage sampling unit 152 to boost module 110
Pressure exports the first feedback voltage to control module 100 after being sampled partial pressure, and the first feedback voltage at this time is normal.When the electricity
When the output voltage of source system operation irregularity or boost module 110 is greater than the first predeterminated voltage, 140 fault block of detection module
With the connection on ground so that the protection location 151 be connected.When the protection location 151 conducting, the voltage sample list
First feedback voltage of the output of member 152 is increased to greater than the second predeterminated voltage, and then the control module 100 is closed, so that
Control module 100 stops output drive signal and controls boost module 110 to boost module 110 and stop working, and then realizes protection
The over-voltage protecting function of module 150 guarantees power good operation.
When it is implemented, referring to Fig. 3, the control module 100 includes control chip U1, the of the control chip U1
9 feet are connect with detection module 140, voltage sampling unit 152 and protection location 151, the 10th foot of the control chip U1 and guarantor
It protects unit 151 and voltage sampling unit 152 connects, the 24th foot and the 23rd foot and boost module 110 of the control chip U1 connects
It connects；The working condition of the control chip U1 control boost module 110, and it is greater than first in the output voltage of boost module 110
Detection module 140 is controlled when predeterminated voltage to open a way, and then is equally cut when first feedback voltage is greater than the second predeterminated voltage
Closed state control boost module 110 is changed to stop working.9 feet, that is, FAIL signal end of the control chip U1 is in power supply system
When system works normally, show as being connected over the ground, i.e., so that detection module 140 is connected over the ground.And when power-supply system operation irregularity,
The 9th foot of the control chip U1 is not turned on over the ground, and then the detection module 140 is opened a way, and the conducting of control and protection unit 151 makes
It obtains the first feedback voltage that the voltage sampling unit 152 exports and is greater than the second predeterminated voltage.The OVP signal end works normally
Voltage is 2.5V, when first feedback voltage reaches 2.9V by the overvoltage protection of delay control chip U1, when described first
Feedback voltage reaches 3V, and then trigger control chip U1 closes stopping output drive signal immediately.I.e. when the OVP signal end detects
When being greater than 3V to the first feedback voltage, the closing of the 24th foot will be immediately controlled in the control chip U1, stop output drive signal extremely
Boost module 110, control boost module 110 stop working, and last whole system does not do copped wave energy storage yet, finally makes power supply system
System safety shutdown, and then it is effectively protected the safe operation of power-supply system.In the present embodiment, the model of the control chip U1
BD9470, also can be selected other control chip U1 with the same function certainly, and the utility model is not construed as limiting this.
Further, the boost module 110 includes boosting unit 111, switch unit 112, rectification unit 113 and electric current
Detection unit 114, the boosting unit 111 connect filter module 120, rectification unit 113 and switch unit 112, the rectification
Unit 113 is also connected with energy-storage module 130 and first voltage sampling unit 152, the connection of the switch unit 112 control chip U1's
24th foot and current detecting unit 114, the 23rd foot of the connection of the current detecting unit 114 control chip U1；By the control
The conducting and closing of 100 control switch unit 112 of module are so that 111 repeated charge of the boosting unit completes the direct current
Boost process, and output is carried out after rectification processing to energy-storage module 130 to the direct current by the rectification unit 113 and is protected
Protect module 150.
Specifically, when controlling chip U1 control switch unit 112 and closing, the direct current that is filtered through filter module 120
For electricity output to boosting unit 111, boosting unit 111 is in charged state storage electric energy；When control chip U1 control switch conducting
When, the boosting unit 111 is discharged to the storage of energy-storage module 130, so that the output voltage of boosted module 110 is higher than input electricity
Pressure, the i.e. voltage of LED+ signal end are higher than the voltage of A point, repeatedly, and then complete the boost process of the direct current, then by
Energy-storage module 130 is load supplying.Meanwhile the boosting unit 111, during being boosted, electric current flows through electricity if it exists
When flowing detection unit 114, the second feedback voltage is formed by the current detecting unit 114 and is exported by CS signal end to control core
Piece U1, when second feedback voltage is greater than control 23 feet of chip U1, that is, CS signal end normal working voltage, same institute
It states control chip U1 to remain off, and then stops output drive signal to boosting unit 111, control boosting unit 111 and stop
It only works, overcurrent protection is formed, to realize the over-voltage and over-current double protection functions in boost process.
Further, with continued reference to FIG. 2, the detection module 140 includes first capacitor C1, the first capacitor C1
One end connection protective module 150 and control module 100, the other end ground connection of the first capacitor C1, when power-supply system works
When abnormal, the 9th foot of the control chip U1 is not connected over the ground, and then the first capacitor C1 is disconnected, so that electric
The first feedback voltage for pressing sampling unit 152 defeated increases, and control control chip U1 is closed, so that boost module 110 stops working,
Guarantee power-supply system job security and stability.
Preferably, the protection location 151 include triode Q1, the base stage connecting detection module 140 of the triode Q1,
The collector of control module 100 and voltage sampling unit 152, the triode Q1 connects voltage sampling unit 152, three pole
The emitter connection voltage sampling unit 152 of pipe Q1 and the 10th foot for controlling chip U1.When the end the first capacitor C1 is come and ground
Connection when so that the voltage difference of the voltage of the triode Q1 base stage and triode Q1 emitter greater than 0.7V be connected, it is described
The conducting of triode Q1, the voltage of the OVP point increases rapidly at this time, i.e. the first feedback voltage is increased to greater than the second default electricity
Pressure is closed so that the control chip U1 closes control boost module 110, so that power-supply system stops working, realization pair
The effective protection of power-supply system.
Further, the voltage sampling unit 152 includes first resistor R1, second resistance R2,3rd resistor R3, the 4th
Resistance R4, the 5th resistance R5, the 6th resistance R6 and the second capacitor C2, the first resistor R1 one end connection LED+ signal end and
The other end of boost module 110, the first resistor R1 passes through one end of second resistance R2 connection 3rd resistor R3, the 4th resistance
One end of R4 and the collector of triode Q1, base stage, the first capacitor of the other end connecting triode Q1 of the 3rd resistor R3
One end of C1 and the 9th foot of control chip U1, the other end of the 4th resistance R4 pass through the 6th resistance of the 5th resistance R5 connection
One end of R6, one end of the second capacitor C1, triode Q1 emitter and control chip U1 the 10th foot, the 6th resistance R6
The other end and the other end of the second capacitor C2 be grounded.
When boosting unit 111 works normally, the first capacitor C1 and ground are connected, and first capacitor C1 is short over the ground at this time
Road, so that the 3rd resistor R3 and the 4th resistance R4 and the 5th resistance R5 holding is connected in parallel, and then the 6th resistance R6
Partial pressure it is normal so that the first feedback voltage of output is normal.When the output voltage of the boosting unit 111 is greater than first
Predeterminated voltage, first capacitor C1 disconnect the connection with ground, so that triode Q1 is connected, the 4th resistance R4 and the 5th resistance R5 at this time
By the collector and emitter clamper of triode Q1, therefore the partial pressure of the 6th resistance R6 increases, i.e., the described 6th resistance R6 passes through
First feedback voltage of sampling partial pressure output valve control the 10th foot of chip is increased to greater than the second predeterminated voltage, and then is effectively triggered
The 24th foot for controlling chip U1 stops output drive signal to boosting unit 111, so that control chip U1 is in real time in power-supply system
Power-supply system is controlled when abnormal to close, and then power supply is effectively ensured and operates in normal voltage range.Preferably, first electricity
The resistance value for hindering R1 is 390K Ω, and the resistance value of the second resistance R2 is 100K Ω, and the resistance value of the 3rd resistor R3 is 91K Ω；
The resistance value of the 4th resistance R4 and the resistance value of the 5th resistance R5 are respectively 300K Ω and 30K Ω；The resistance of the 6th resistance R6
Value is 120 K Ω.
Preferably, the boosting unit 111 includes boost inductance L1, and the 1st foot of the boost inductance L1 connects the filter
Wave module 120, the 2nd foot, the 3rd foot and the 4th foot of the boost inductance L1 are all connected with switch unit 112 and rectification unit 113.By
The switch of chip U1 control switch unit 112 is controlled so that the repeated charge of boost inductance L1 causes voltage to increase, that is,
So that the output voltage of boosted module 110 is higher than input voltage, i.e. the voltage of LED+ signal end is completed higher than the voltage of A point
PFC boost process.
Preferably, the switch unit 112 includes the 7th resistance R7, the 8th resistance R8, first diode D1 and metal-oxide-semiconductor
The cathode of Q2, the first diode D1 and one end of the 8th resistance R8 control the 24th of chip U1 by the 7th resistance R7 connection
Foot, the grid of the anode connection metal-oxide-semiconductor Q2 of the other end and first diode D1 of the 8th resistance R8, the metal-oxide-semiconductor Q2's
Source electrode connects current detecting unit 114, the drain electrode connection boosting unit 111 and rectification unit 113 of the metal-oxide-semiconductor Q2, by controlling
The 24th foot output drive signal of chip U1 controls the on or off of metal-oxide-semiconductor Q2 to switch unit 112, completes to liter
The charging repeatedly of voltage inductance L1, and then realize the boost process of boost module 110.
Preferably, the rectification unit 113 includes the second diode D2 and third diode D3, the second diode D2
Anode and third diode D3 anode connection boost voltage the 2nd foot, the 3rd foot and the 4th foot and metal-oxide-semiconductor Q2 drain electrode, institute
State the cathode of the second diode D2 and cathode connection energy-storage module 130, LED+ signal end and the first resistor of the second diode D2
One end of R1, output is extremely stored up after being rectified the output voltage after boosting by the second diode D2 and third transistor Q1
Energy module 130, effectively improves the stability of output voltage.
Preferably, the current detecting unit 114 includes the 9th resistance R9 and the tenth resistance R10, the 9th resistance R9
One end connected with one end of the tenth resistance R10 control chip U1 the 23rd foot and metal-oxide-semiconductor Q2 source electrode, the 9th resistance R9
The other end and the other end of the tenth resistance R10 be grounded, pass through the 9th resistance R9 and the tenth resistance R10 and detect boost module
Feedback current in 110 forms the second feedback voltage, can be by control core when the second feedback voltage is greater than third predeterminated voltage
The 23rd foot of piece U1 is stopped working after directly detecting by control chip U1 control boost module 110, is realized in boost process
Overcurrent, overvoltage double protection.
It is further preferred that the energy-storage module 130 includes third capacitor C3, one end connection the of the third capacitor C3
One end of the cathode of two diode D2, the cathode of third diode D3, LED+ signal end and first resistor R1, the third capacitor
The other end of C3 is grounded, and is discharged by boost inductance L1 third capacitor C3, and storage electric energy is load supplying.
Preferably, the filter module 120 includes fuse F1 and the 4th capacitor C4, and one end of the fuse F1 connects
The other end of the input terminal of direct current, the fuse F1 connects one end of the 4th capacitor C4 and the 1st foot of boost inductance L1, by
The fuse F1 provides the overload protection of direct current for the DC-DC circuit with over-voltage protecting function, by the described 4th
Capacitor C4 is filtered input dc power, it is ensured that the direct current of input is stablized effective.
To better understand the utility model, below in conjunction with Fig. 2 and Fig. 3, for concrete application embodiment to the utility model
The course of work of the DC-DC circuit with over-voltage protecting function provided is described in detail:
When 9 feet, that is, FAIL signal end that power-supply system operates normally time control coremaking piece U1 shows as on state over the ground.
The FAIL signal end in Fig. 2 is connected over the ground at this time, then first capacitor C1 shorted to earth, is equivalent to 3rd resistor R3 directly with
Four resistance R4, the 5th resistance R5 and the 6th resistance R6 are in parallel, according to resistance of the resistance value of each resistance after in parallel for R0=
R3//(R4+R5+R6)=75.69KΩ。
If the output voltage of boosting unit 111 is 70V, then according to the resistance value of first resistor R1 and second resistance R2, then
According to the voltage division formulas of resistance can be obtained B point voltage be VB=75.69K Ω * 70V/ (75.69K Ω+390K+100K)=
The voltage of 9.366V, i.e. B point is 9.366V when power-supply system works normally.The voltage of OVP point will be again by the 4th electricity at this time
Resistance R4, the 5th resistance R5 and the 6th resistance R6 divide to obtain to 9.366V, i.e. voltage on the 6th resistance R6.According to voltage division formulas
OVP point voltage is 9.366V*120K Ω/(+300 Ω of 120K Ω+30K Ω) ≈ 2.5V, and system operates normally at this time, the of output
One feedback voltage is 2.5V.Preferably, corresponding over-voltage can be set by the way that the resistance value of each divider resistance is arranged in the application
Point is protected, so that the DC-DC circuit with over-voltage protecting function can adapt to and various application occasions.
When any failure occurs for system, such as overcurrent, over-voltage, when the failures such as short circuit, state that FAIL signal end is by
Ground state becomes open-circuit condition, and C point voltage, that is, triode Q1 base voltage will be approximately equal to B point voltage i.e. at this time
9.366V, since C point and OVP point voltage difference have been greater than 0.7V, i.e. the base-emitter voltage difference of triode Q1 is greater than 0.7V,
So that triode Q1 is connected, the 4th resistance R4 and the 5th resistance R5 will be clamped by the collector and emitter of triode Q1 at this time
Position, the voltage of OVP point will rise rapidly greater than 3.0V at this time, and the 10 feet, that is, OVP signal end for controlling chip U1 detects voltage
When greater than 3.0V, the output of control the 24th foot driving signal of chip U1 will be closed, and then the metal-oxide-semiconductor Q2 loses driving signal and stops
It only works, last whole system does not do copped wave energy storage, final safety shutdown yet.
The utility model further correspondingly provides a kind of DC-DC over-pressure safety device, including the DC- with over-voltage protecting function
DC circuit, since the DC-DC circuit with over-voltage protecting function being described in detail above, details are not described herein again.
In conclusion the DC-DC circuit and device provided by the utility model with over-voltage protecting function, the DC-DC
Circuit includes filter module, boost module, control module, detection module and protective module, and input dc power passes through filter module
To boost module, the control module output drive signal driving boost module is opened, described straight for output after being filtered
Galvanic electricity exports after boost module boosting to protective module；The protective module to the output voltage of the boost module into
The first feedback voltage is exported after row sampling partial pressure to control module, when the output voltage of the boost module is greater than the first default electricity
When pressure, the control module controls the detection module open circuit, so that first feedback voltage is greater than the second predeterminated voltage, into
And the control module stops output drive signal, controlling the boost module stops working, to ensure that power supply Constant Electric Current
The output voltage on road is run within the scope of safe clearance, it is ensured that power good operation.
It is understood that for those of ordinary skills, can with technical solution according to the present utility model and
The design of its utility model is subject to equivalent substitution or change, and all these changes or replacement all should belong to appended by the utility model
Scope of protection of the claims.
Claims (10)
1. a kind of DC-DC circuit with over-voltage protecting function, which is characterized in that including filter module, boost module, control mould
Block, detection module and protective module, input dc power is exported after filter module is filtered to boost module, described
Control module output drive signal drives boost module to open, and direct current output after boost module boosting is extremely protected
Module；The protective module is sampled after partial pressure the output voltage of the boost module and exports the first feedback voltage to control
Module, when the output voltage of the boost module is greater than the first predeterminated voltage, the control module controls the detection module
Open circuit, so that first feedback voltage is greater than the second predeterminated voltage, and then the control module stops output drive signal, control
The boost module is made to stop working.
2. DC-DC circuit according to claim 1, which is characterized in that the protective module includes protection location and voltage
Sampling unit, output first is fed back after being sampled partial pressure by output voltage of the voltage sampling unit to the boost module
Voltage is to control module；When detection module open circuit, the protection location conducting is so that first feedback voltage is greater than
Second predeterminated voltage.
3. DC-DC circuit according to claim 2, which is characterized in that the control module includes control chip, the control
9th foot of coremaking piece is connect with detection module, voltage sampling unit and protection location, the 10th foot of the control chip and protection
Unit is connected with voltage sampling unit, and the 24th foot and the 23rd foot of the control chip are connect with boost module.
4. DC-DC circuit according to claim 1, which is characterized in that the boost module includes boosting unit, switch list
Member and rectification unit, by the conducting and closing of the control module control switch unit so that the boosting unit repeated charge
The boost process of the direct current is completed, and is exported after carrying out rectification processing to the direct current by the rectification unit to protection
Module.
5. DC-DC circuit according to claim 1, which is characterized in that the detection module includes first capacitor, and described
One end connection protective module and control module of one capacitor, the other end ground connection of the first capacitor.
6. DC-DC circuit according to claim 2, which is characterized in that the protection location includes triode, three pole
The collector of base stage connecting detection module, control module and the voltage sampling unit of pipe, the triode connects voltage sample list
Member, the emitter connection voltage sampling unit and control module of the triode.
7. DC-DC circuit according to claim 2, which is characterized in that the voltage sampling unit includes first resistor,
Two resistance, 3rd resistor, the 4th resistance, the 5th resistance, the 6th resistance and the second capacitor, one end connection of the first resistor
LED+ signal end and boost module, the other end of the first resistor connect one end of 3rd resistor, the 4th by second resistance
One end of resistance and protection location, other end connection protection location, detection module and the control module of the 3rd resistor are described
The other end of 4th resistance connects the one end, protection location and control of one end, the second capacitor of the 6th resistance by the 5th resistance
Module, the other end of the 6th resistance and the other end of the second capacitor are grounded.
8. DC-DC circuit according to claim 4, which is characterized in that the boosting unit includes boost inductance, the liter
1st foot of voltage inductance connects filter module, and the 2nd foot, the 3rd foot and the 4th foot of the boost inductance are all connected with switch unit and whole
Flow unit.
9. DC-DC circuit according to claim 4, which is characterized in that the switch unit includes the 7th resistance, the 8th electricity
One end of resistance, first diode and metal-oxide-semiconductor, the cathode of the first diode and the 8th resistance passes through the connection control of the 7th resistance
Module, the grid of the anode connection metal-oxide-semiconductor of the other end and first diode of the 8th resistance, the source electrode of the metal-oxide-semiconductor connect
Connect control module, the drain electrode connection boosting unit and rectification unit of the metal-oxide-semiconductor.
10. a kind of DC-DC device with over-voltage protecting function, which is characterized in that including such as claim 1-9 any one institute
The DC-DC circuit stated.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201822144532.9U CN209217948U (en) | 2018-12-20 | 2018-12-20 | A kind of DC-DC circuit and device with over-voltage protecting function |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201822144532.9U CN209217948U (en) | 2018-12-20 | 2018-12-20 | A kind of DC-DC circuit and device with over-voltage protecting function |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN209217948U true CN209217948U (en) | 2019-08-06 |
Family
ID=67465432
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201822144532.9U Active CN209217948U (en) | 2018-12-20 | 2018-12-20 | A kind of DC-DC circuit and device with over-voltage protecting function |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN209217948U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114552992A (en) * | 2022-03-22 | 2022-05-27 | 青岛汉泰智能科技有限公司 | Direct-current power supply system and control method |
-
2018
- 2018-12-20 CN CN201822144532.9U patent/CN209217948U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114552992A (en) * | 2022-03-22 | 2022-05-27 | 青岛汉泰智能科技有限公司 | Direct-current power supply system and control method |
| CN114552992B (en) * | 2022-03-22 | 2024-01-26 | 青岛汉泰智能科技有限公司 | Direct-current power supply system and control method |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN105119365B (en) | Dual-channel DC power supply automatic switching device | |
| CN101867168B (en) | Power protecting circuit and LED lamp | |
| CN102820638B (en) | Overcurrent protection device and electronic equipment | |
| CN107196380B (en) | Robot power management system and robot | |
| CN101378187A (en) | Power supply protection circuit | |
| CN207117164U (en) | The power protecting circuit and display device of a kind of display device | |
| CN110676918A (en) | Battery switch circuit, power supply management system and method | |
| CN106992668B (en) | A kind of alternating current-direct current Mixed design DC power supply | |
| CN104113209A (en) | Power module supporting wide voltage inputting | |
| CN107171401A (en) | A kind of pair of accessory power supply and the energy-storage system based on double accessory power supplys | |
| CN109638956A (en) | Power supply switch circuit | |
| CN103747592A (en) | Intelligent single live wire serial connection touch wireless remote control wall switch | |
| CN210640722U (en) | Battery switch circuit and power supply management system comprising same | |
| CN107635343A (en) | Input detection protection circuit and HID lamp AC electronic ballast | |
| CN209217948U (en) | A kind of DC-DC circuit and device with over-voltage protecting function | |
| CN107846063A (en) | A kind of intelligent instrumentation protection system based on farad capacitor | |
| CN201985831U (en) | Novel electronic switching circuit with built-in lithium battery of portable power source product | |
| CN206820461U (en) | Power supply protection circuit | |
| CN108039697A (en) | Overload protecting circuit | |
| CN209104898U (en) | Power supply switch circuit | |
| CN207625292U (en) | Power supply switching circuit and television power supply system | |
| CN201256220Y (en) | Induction safety socket circuit | |
| CN207782383U (en) | Overload protecting circuit | |
| CN205960779U (en) | P type monitoring formula switching power | |
| CN206323124U (en) | Over-voltage and under-voltage protection circuit, backlight circuit and liquid crystal television |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |