CN106712502A - Voltage boosting device integrating overcurrent protection detection and overvoltage protection detection - Google Patents
Voltage boosting device integrating overcurrent protection detection and overvoltage protection detection Download PDFInfo
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- CN106712502A CN106712502A CN201510475903.XA CN201510475903A CN106712502A CN 106712502 A CN106712502 A CN 106712502A CN 201510475903 A CN201510475903 A CN 201510475903A CN 106712502 A CN106712502 A CN 106712502A
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Abstract
The invention provides a voltage boosting device comprising a boosting type power conversion line and a control chip. The boosting type power conversion line is configured to receive DC input voltage and respond to a pulse width modulation signal to provide DC output voltage to a light-emitting diode load. The control chip is provided with a first composite function pin and configured for producing the pulse width modulation signal to control operation of the boosting type power conversion line; performing overcurrent protection detection on the boosting type power conversion line through the first composite function pin when the pulse width modulation signal is enabled so as to judge whether an overcurrent protection mechanism is started; and performing overvoltage protection detection on the boosting type power conversion line through the first composite function pin when the pulse width modulation signal is unabled so as to judge whether an overvoltage protection mechanism is started.
Description
Technical field
The present invention relates to a kind of Power convert and provisioning technique, and more particularly to a kind of integration over current protection
Shield detection and the increasing apparatus of overvoltage protection detection.
Background technology
Now using the increasing apparatus (boost of (PWM-based) based on PWM framework
Apparatus) can be configured to can provide VD and used to load, and the control core in it
Piece typically has two independent detection pins, individually and independently to detect whether increasing apparatus have hair
Raw overcurrent phenomenon and overvoltage phenomenon, so as to determine whether to start corresponding over current protection protection mechanism
With overvoltage protection mechanism.With this understanding, to other circuit functions of additional to increasing apparatus
In if, then the pin number of control chip is just proportionally increased, so as to cause chip (IC)
Cost increase.
The content of the invention
In view of this, the present invention provides a kind of overcurrent protection of integrating and detects and overvoltage protection detection
Increasing apparatus, thus efficiently solve the problem that prior art is addressed.
Other objects of the present invention and advantage can from disclosed herein technical characteristic in entered
The understanding of one step.
Here, an one exemplary embodiment of the invention provide one kind be adapted to provide for a VD to
The increasing apparatus of LED load, it includes：Boost type power conversion circuit and control chip.
Wherein, boost type power conversion circuit be configured to receive a DC input voitage, and in response to
One pulse-width modulation signal and provide the VD to LED load.Control chip coupling
Boost type power conversion circuit is connect, and is configured to one first complex function pin, and control chip
It is able to carry out：The pulse-width modulation signal is produced to control the running of boost type power conversion circuit；
During the pulse-width modulation signal enable, boost type power supply is turned by the first complex function pin
Thread-changing road carries out overcurrent protection detection, thus judges whether to start over current protection protection mechanism；And
During the pulse-width modulation signal forbidden energy, boost type power supply is turned by the first complex function pin
Thread-changing road carries out overvoltage protection detection, thus judges whether to start overvoltage protection mechanism.
In an one exemplary embodiment of the invention, the first complex function pin can be one
OCP/OVP pins, and boost type power conversion circuit can include：Inductance, the first diode,
First electric capacity, N-type power switch, and first resistor.Wherein, the first end of inductance is used to receive
The DC input voitage.The anode of the first diode be coupled to the second end of inductance with it is described
OCP/OVP pins, and the negative electrode of the first diode is then coupled to the anode of LED load simultaneously
It is used to produce the VD.The first end of the first electric capacity couples the negative electrode of the first diode,
And the second end of the first electric capacity is then coupled to an earthing potential.The drain electrode coupling first of N-type power switch
The anode of diode, the grid of N-type power switch is used to receive the pulse-width modulation signal, and N-type
The source electrode of power switch is then coupled to the OCP/OVP pins.The first end coupling N of first resistor
The source electrode of type power switch, and the second end of first resistor is then coupled to the earthing potential.
In an one exemplary embodiment of the invention, in the pulse-width modulation signal enable, core is controlled
Piece can be by the OCP/OVP pins to detect the cross-pressure of first resistor, and in response to first
The cross-pressure of resistance and overcurrent protection detection is carried out to boost type power conversion circuit, thus judge whether
Start over current protection protection mechanism.With this understanding, whenever the cross-pressure of first resistor is more than control chip institute
During a built-in overcurrent protection reference voltage, then control chip can start over current protection protection mechanism, by
This progressively reduces the dutycycle of the pulse-width modulation signal, until the dutycycle of the pulse-width modulation signal
The cross-pressure of a minimum duty cycle or first resistor is reduced to less than the overcurrent protection with reference to electricity
Untill pressure.
In an one exemplary embodiment of the invention, in the pulse-width modulation signal forbidden energy, core is controlled
Piece by the OCP/OVP pins to detect the anode voltage of the first diode, and can be responded
Overvoltage protection detection is carried out to boost type power conversion circuit in the anode voltage of the first diode,
Thus judge whether to start overvoltage protection mechanism.With this understanding, whenever the anode of the first diode
When voltage is more than a control chip built-in overvoltage protection reference voltage, then control chip can start
Overvoltage protection mechanism, thus adjusts to a minimum the one of the pulse-width modulation signal next dutycycle
Dutycycle, untill the anode voltage of the first diode is less than the overvoltage protection reference voltage.
In an one exemplary embodiment of the invention, control chip can have more an INN pins, and
Increasing apparatus can be further included：Feedback line, the negative electrode that it is coupled to LED load with it is described
Between INN pins, it is used to provide the feedback voltage for being associated with LED load to control chip.
With this understanding, control chip can more adjust the PWM letter in response to the feedback voltage
Number, thus control boost type power conversion circuit stably to provide the VD.
In an one exemplary embodiment of the invention, control chip can have more one second complex function
Pin, the second complex function pin can be a CMP/EA pin, and increasing apparatus can be with
Further include：Resistance capacitance networking and enable/light modulation circuit.Wherein, resistance capacitance networking is coupled to described
CMP/EA pins, and it is configured to compensate the offset voltage on the CMP/EA pins,
Thus the pulse-width modulation signal that stability contorting chip is exported, and then stabilization boost type power conversion circuit
The VD for being provided.Enable/light modulation circuit is coupled to the CMP/EA pins, and its
It is configured to control chip is possessed a chip enable function and a dimming function.With this understanding,
When control chip does not receive the feedback voltage from feedback line, then the offset voltage meeting
It is gradually ramped up to a predetermined maximum voltage level from a normal operation level.When the offset voltage is maintained
When the predetermined maximum voltage level is up to a Preset Time, then control chip can enter a closing shape
State.
Based on above-mentioned, in above-mentioned one exemplary embodiment of the invention, due to the overcurrent of increasing apparatus
Protection detection ties up to the pulse-width modulation signal and is respectively at enable and forbidden energy with overvoltage protection detection
When carried out/performed, so control chip can be realized by same OCP/OVP pin to rise
The overcurrent protection and overvoltage protection of pressure device.Detected and overvoltage guarantor by integrating overcurrent protection
Protect the mode of detection, you can the pin number of reduction control chip, thus reduce chip cost, so that
It is addressed the problem that prior art is addressed.
It is that features described above of the invention and advantage can be become apparent, special embodiment below, and match somebody with somebody
Appended accompanying drawing is closed to be described in detail below.
Brief description of the drawings
Accompanying drawing appended below is a part for description of the invention, depicts example embodiment of the invention,
Appended accompanying drawing illustrates principle of the invention together with the description of specification.
Fig. 1 is schematically shown as the increasing apparatus (boost apparatus) 10 of an one exemplary embodiment of the invention
System block diagram；
Fig. 2 is schematically shown as the implementation schematic diagram of the increasing apparatus 10 of Fig. 1；
Fig. 3 is schematically shown as the part operation oscillogram of the increasing apparatus 10 of Fig. 2.
【Symbol description】
10：Increasing apparatus
20：LED load
101：Boost type power conversion circuit
103：Control chip
105：Feedback line
107：Resistance capacitance networking
109：Enable/light modulation circuit
D1、DEN_DIM：Diode
C1、CC：Electric capacity
L：Inductance
Q：N-type power switch
R1~R3, Rf1, Rf2, RC, REN_DIM：Resistance
VDD、OUT、INN、OCP/OVP、CMP/EA、GND：Pin
DC_IN：DC input voitage
DC_OUT：VD
GPW：Pulse-width modulation signal
VA、VINN、VR1、VCOMP、Vocp_ref、Vovp_ref、Vmax、Vnor：Voltage
EN：Enable signal
DIM：Dim signal
Dmax、Dmin、Dnor：Dutycycle
PA~PE：Cycle
t1：Time
Specific embodiment
With detailed reference to one exemplary embodiment of the invention, the exemplary implementation is illustrated in the accompanying drawings
The example of example.In addition, all possible parts, use the element of identical label in drawings and the embodiments
/ component represents same or like part.
Fig. 1 is schematically shown as the increasing apparatus (boost apparatus) 10 of an one exemplary embodiment of the invention
System block diagram, and Fig. 2 is schematically shown as the implementation schematic diagram of the increasing apparatus 10 of Fig. 1.Please merge
Reference picture 1 and Fig. 2, increasing apparatus 10 are adapted to provide for VD (DC output voltage)
DC_OUT gives any kind of load, for example：LED load 20, but it is not limited to this.
Increasing apparatus 10 can include：Boost type power conversion circuit (boost power conversion circuit)
101st, control chip (control chip) 103, feedback line (feedback circuit) 105, electricity
Resistance capacitor networks (RC network) 107, and enable/light modulation circuit (enable/dimming circuit)
109。
In this one exemplary embodiment, boost type power conversion circuit 101 can be configured to can receive straight
Stream input voltage (DC input voltage) DC_IN, and in response to the arteries and veins from control chip 105
Width modulation signal (pulse-width-modulation signal, PWM signal) GPW and provide straight
Stream output voltage DC_OUT is to LED load 20.For example, boost type Power convert
Circuit 101 can include：Inductance (inductor) L, diode D1 (diode, for example, Xiao Te
Base (Schottky) diode, but be not limited to this), electric capacity (capacitor) C1, N-type power
Switch (N-type power switch) Q, and resistance (resistor) R1~R3.Wherein, N-type
Power switch Q can be adopted with N-type power metal-oxide semiconductor field effect transistor (N-type
Power MOSFET) implement, but it is not limited to this.
The first end of inductance L is used to receive (or being coupled to) DC input voitage DC_IN.Diode
The anode (anode) of D1 is coupled to second end of inductance L and can be coupled by resistance R2
To the OCP/OVP pins (that is, the first complex function pin) of control chip 103, and diode
The negative electrode (cathode) of D1 is then coupled to the anode of LED load 20 and is used to produce direct current
Output voltage DC_OUT.The negative electrode of the first end coupling diode D1 of electric capacity C1, and electric capacity C1
The second end be then coupled to earthing potential (0V).Drain electrode (drain) coupling of N-type power switch Q
The anode of diode D1, the grid (gate) of N-type power switch Q is used to receive from control core
The pulse-width modulation signal GPW that the OUT pins of piece 103 are exported, and N-type power switch Q
The OCP/OVP that source electrode (source) then can be coupled to control chip 103 by resistance R3 draws
Pin.The source electrode of the first end coupling N-type power switch Q of resistance R1, and second end of resistance R1
Then it is coupled to earthing potential.
On the other hand, feedback line 105 is coupled to the negative electrode and control core of LED load 20
Between the INN pins of piece 103, it is used to provide the feedback voltage for being associated with LED load 20
VINN is to control chip 103.With this understanding, control chip 103 more can be in response to feedback line
The feedback voltage V that road 105 is providedINNAnd adjust pulse-width modulation signal GPW (for example：Adjustment arteries and veins
The dutycycle of width modulation signal GPW), thus control boost type power conversion circuit 101 stably to carry
For VD DC_OUT to LED load 20.In this one exemplary embodiment,
Feedback line 105 can be made up of two feedback resistances (feedback resistor) (Rf1, Rf2),
But it is not limited to this.Wherein, the first end of feedback resistance Rf1 is coupled to LED load 20
Negative electrode, and second end of feedback resistance Rf1 is then coupled to earthing potential.In addition, feedback resistance
The first end of Rf2 is equally coupled to the negative electrode of LED load 20, and the of feedback resistance Rf2
Two ends are then coupled to the INN pins of control chip 103.
In addition, resistance capacitance networking 107 is coupled to the CMP/EA pins of control chip 103 (i.e.,
Second complex function pin), and it is configured to compensate the CMP/EA pins of control chip 103
On offset voltage VCOMP, the pulse-width modulation signal GPW that thus stability contorting chip 103 is exported,
And then the VD DC_OUT that stabilization boost type power conversion circuit 101 is provided.At this
In one exemplary embodiment, resistance capacitance networking 107 can be by the compensation resistance RC and compensating electric capacity that concatenate
RC is constituted, but is not limited to this.
Moreover, control chip 103 is except that can have foregoing OCP/OVP pins (that is, first
Complex function pin), OUT pins, INN pins and CMP/EA pins (that is, the second compound work(
Energy pin) beyond, it can also necessarily have VDD pins and GND pin.Certainly, based on reality
Border design/application demand, can set up other functional pins, or delete control to control chip 103
The existing functional pin of coremaking piece 103.Substantially, in order to control chip to be allowed 103 is able to normally
Running, VDD pins can receive operation needed for DC input voitage DC_IN, and GND pin meeting
It is coupled to earthing potential.Consequently, it is possible to control chip 103 can be to DC input voitage DC_IN
Changed (for example：Lifting/voltage reducing) obtaining the operating voltage needed for its internal circuit (not illustrating).
In this one exemplary embodiment, the coupling boost type of control chip 103 power conversion circuit 101,
And it is configured to perform：(1) pulse-width modulation signal GPW is produced to control boost type power supply to turn
The running on thread-changing road 101；(2) in pulse-width modulation signal GPW enables, by OCP/OVP
Pin and overcurrent protection detection (OCP detection) is carried out to boost type power conversion circuit 101,
Thus judge whether to start over current protection protection mechanism (OCP mechanism)；And (3) are in pulsewidth
During modulating signal GPW forbidden energy, by OCP/OVP pins to boost type power conversion circuit 101
Overvoltage protection detection (OVP detection) is carried out, thus judges whether to start overvoltage protection machine
System (OVP mechanism).
For becoming apparent from, in pulse-width modulation signal GPW enables, control chip 103 can pass through
OCP/OVP pins are detecting the cross-pressure V of first resistor R1R1, and in response to first resistor R1
Cross-pressure VR1And overcurrent protection detection is carried out to boost type power conversion circuit 101, thus judge
Whether over current protection protection mechanism is started.With this understanding, whenever the cross-pressure V of first resistor R1R1
During built-in more than (or top arrive) control chip 103 overcurrent protection reference voltage Vocp_ref,
Then control chip 103 can start over current protection protection mechanism, thus progressively reduce pulse-width modulation signal
The dutycycle (duty cycle) of GPW, until the dutycycle of pulse-width modulation signal GPW is reduced to
The cross-pressure V of minimum duty cycle (minimum duty cycle, Dmin) or first resistor R1R1
It is small untill overcurrent protection reference voltage Vocp_ref (that is, without overcurrent phenomenon).
As an example it is assumed that the previous dutycycle of pulse-width modulation signal GPW is 75% (condition 1)
If (N is positive integer), once the cross-pressure V of first resistor R1R1In the feelings of condition 1 (75%)
Under condition during the overcurrent protection reference voltage Vocp_ref built-in more than control chip 103, then control
Chip 103 can start over current protection protection mechanism, thus reduce pulse-width modulation signal GPW instantly
Dutycycle (for example, tapering to 60%, but being not limited to this) (condition 2).Once first resistor R1
Cross-pressure VR1It is built-in also greater than control chip 103 excessively electric in the case of condition 2 (60%)
(that is, persistently there is overcurrent phenomenon) during stream protection reference voltage Vocp_ref, then control chip 103
May proceed to start over current protection protection mechanism, thus reduce next dutycycle of pulse-width modulation signal GPW
(for example, tapering to 50%, but being not limited to this), the rest may be inferred, until pulse-width modulation signal GPW
Dutycycle be reduced to minimum duty cycle (Dmin) untill；Once conversely, first resistor R1
Cross-pressure VR1Switch in the case of condition 2 (60%) less than built-in excessively electric of control chip 103
During stream protection reference voltage Vocp_ref, then control chip 103 can stop starting over current protection protection mechanism
(that is, without overcurrent phenomenon).
On the other hand, in pulse-width modulation signal GPW forbidden energy, control chip 103 can pass through
OCP/OVP pins to detect the anode voltage VA of diode D1, and in response to diode D1
Anode voltage VA and overvoltage protection detection is carried out to boost type power conversion circuit 101, thus
Determine whether to start overvoltage protection mechanism.With this understanding, whenever the anode electricity of diode D1
Pressure VA is more than (or top is arrived) the built-in overvoltage protection reference voltage Vovp_ref of control chip 103
When, then control chip 103 can start overvoltage protection mechanism, thus by pulse-width modulation signal GPW
Next dutycycle adjust to minimum duty cycle (Dmin), until the anode voltage VA of diode D1
Untill overvoltage protection reference voltage Vovp_ref (that is, without overvoltage phenomenon).
For example, Fig. 3 is schematically shown as the part operation oscillogram of the increasing apparatus 10 of Fig. 2.Please close
And refering to Fig. 2 and Fig. 3, it is assumed that increasing apparatus 10 are in the state of normal operating before time t 1,
With this understanding, the feedback voltage that control chip 103 can feed back/provide in response to feedback line 105
VINN and export the pulse-width modulation signal GPW with dutycycle Dnor, thus control boost type electricity
Source conversion line 101 stably provides VD DC_OUT to LED load 20.
In addition, at increasing apparatus 10 in the state of normal operating, due to without overcurrent phenomenon
(VR1 ＜ Vocp_ref) and without overvoltage phenomenon (VA ＜ Vovp_ref), therefore control chip 103 is not
Can start corresponding over current protection protection mechanism and overvoltage protection mechanism, and control chip 103
Offset voltage V on CMP/EA pinsCOMPIn a normal operation level Vnor.
On the other hand, it is assumed that LED load 20 breaks down (for example in time t1：Open
Road), with this understanding, because feedback line 105 cannot feed back/provide feedback voltage V INN (0V)
To control chip 103, so control chip 103 can have maximum duty cycle in cycle PA outputs
(Dmax) pulse-width modulation signal GPW, thus controls boost type power conversion circuit 101.
Cycle PA, in the pulse-width modulation signal GPW forbidden energy with maximum duty cycle (Dmax), by
Overvoltage protection reference voltage Vovp_ref can be pushed up in the anode voltage VA of diode D1, so
Control chip 103 can start overvoltage protection mechanism, thus in cycle PB by pulse-width modulation signal
The dutycycle of GPW is adjusted to minimum duty cycle (Dmin).Similarly, in cycle PB, have
During the pulse-width modulation signal GPW forbidden energy of minimum duty cycle (Dmin), due to the sun of diode D1
Pole tension VA can still push up overvoltage protection reference voltage Vovp_ref, so control chip 103
Overvoltage protection mechanism can be started, thus in cycle PC by the dutycycle of pulse-width modulation signal GPW
Maintain minimum duty cycle (Dmin).
On the contrary, in cycle PC, in the pulse-width modulation signal GPW with minimum duty cycle (Dmin)
During forbidden energy, because the anode voltage VA of diode D1 has switched to less than overvoltage protection reference voltage
Vovp_ref, so control chip 103 can stop starting overvoltage protection mechanism, but due to not having yet
Feedback voltage VINNFeedback/the offer of (0V), so control chip 103 still can be defeated in cycle PD
Go out the pulse-width modulation signal GPW with maximum duty cycle (Dmax), thus control boost type power supply
Conversion line 101.But, in cycle PD, adjusted in the pulsewidth with maximum duty cycle (Dmax)
During varying signal GPW forbidden energy, because the anode voltage VA of diode D1 can push up overvoltage protection again
Reference voltage Vovp_ref, so control chip 103 can start overvoltage protection mechanism again, thus exists
Cycle PE adjusts to minimum duty cycle (Dmin) dutycycle of pulse-width modulation signal GPW.It is based on
Startup (stopping starting) overvoltage protection that above-mentioned control chip 103 is enumerated in cycle PA~PE
The content of mechanism, you can function mode of the control chip 103 after cycle PE that the rest may be inferred, therefore
And herein and be not repeated here.
However, the fortune due to control chip 103 in failure (open circuit) of LED load 20
Make (for example：Intermittently/routinely start overvoltage protection mechanism) can also produce meaningless power
Loss.Therefore, in this one exemplary embodiment, control chip 103 is able to by detecting CMP/EA
Offset voltage V on pinCOMPChange, and be further determined whether closed mode to be entered
(shutdown status).For becoming apparent from, when control chip 103 is not received from feedback line
105 feedback voltage VINNWhen, then offset voltage VCOMPCan from a normal operation level Vnor by
Gradually rise to a predetermined maximum voltage level Vmax.When offset voltage Vmax maintains default maximum
Voltage quasi position Vmax be up to a Preset Time when (for example：156ms, but it is not limited to this), then control
Coremaking piece 103 can enter closed mode, thus avoid producing meaningless power attenuation.
On the other hand, enable/light modulation circuit 109 is coupled to the CMP/EA pins of control chip 103,
And it is configured to enable control chip 103 to possess chip enable function (chip enable function)
With dimming function (dimming function).For becoming apparent from, enable/light modulation circuit 109 can be by going here and there
The resistance R for connecingEN_DIMWith diode DEN_DIMConstituted, but be not limited to this.In this exemplary reality
Apply in example, enable/light modulation circuit 109 may be in response to the input of enable signal EN and start control chip
103 (thus, you can make control chip 103 possess chip enable function)；In addition, enable/
Light modulation circuit 109 may be in response to the input of dim signal DIM and make control chip 103 pairs luminous two
Pole pipe load 20 carry out light modulation operation (for example, when the dim signal DIM enables being input into,
Then control chip 103 is just able to output pulse width modulating signal GPW；Conversely, working as be input into light modulation
During signal DIM forbidden energy, then control chip 103 stops output pulse width modulating signal GPW.Such one
Come, you can control chip 103 is possessed dimming function).
In sum, in above-mentioned one exemplary embodiment of the invention, due to the mistake of increasing apparatus 10
Current protection detect with overvoltage protection detection be pulse-width modulation signal GPW be respectively at enable with
Carried out/performed during forbidden energy, so control chip 103 can by same OCP/OVP pin come
Realize the overcurrent protection and overvoltage protection to increasing apparatus 10.Examined by integrating overcurrent protection
Survey the mode with overvoltage protection detection, you can the pin number of reduction control chip 103, thus drop
Low chip cost, so as to be addressed the problem that prior art is addressed.
Particular embodiments described above, is carried out to the purpose of the present invention, technical scheme and beneficial effect
Further describe, it should be understood that the foregoing is only specific embodiment of the invention,
It is not intended to limit the invention, all any modifications within the spirit and principles in the present invention, made,
Equivalent, improvement etc., should be included within the scope of the present invention.
Claims (10)
1. a kind of increasing apparatus, are adapted to provide for a VD to a LED load,
The increasing apparatus include：
One boost type power conversion circuit, it is configured to receive a DC input voitage, and rings
Ying Yuyi pulse-width modulation signals and the VD is provided and gives the LED load；And
One control chip, couples the boost type power conversion circuit, and draw with one first complex function
Pin, the wherein control chip are configured to perform：
The pulse-width modulation signal is produced to control the running of the boost type power conversion circuit；
In the pulse-width modulation signal enable, by the first complex function pin to the boost type
Power conversion circuit carries out an overcurrent protection detection, thus judges whether to start an overcurrent protection machine
System；And
In the pulse-width modulation signal forbidden energy, by the first complex function pin to the boost type
Power conversion circuit carries out an overvoltage protection detection, thus judges whether to start an overvoltage protection machine
System.
2. increasing apparatus as claimed in claim 1, wherein the first complex function pin are one
OCP/OVP pins, and the boost type power conversion circuit includes：
One inductance, its first end is used to receive the DC input voitage；
One first diode, its anode is coupled to the second end and OCP/OVP pins of the inductance,
And its negative electrode is then coupled to the anode of the LED load and is used to produce the VD；
One first electric capacity, its first end couples the negative electrode of first diode, and its second end then couples
To an earthing potential；
One N-type power switch, its drain electrode couples the anode of first diode, and its grid is used to receive
The pulse-width modulation signal, and its source electrode is then coupled to the OCP/OVP pins；And
One first resistor, its first end couples the source electrode of the N-type power switch, and its second end then coupling
It is connected to the earthing potential.
3. increasing apparatus as claimed in claim 2, wherein boost type power conversion circuit is more wrapped
Include：
One second resistance, its first end is coupled to the second end of the inductance and the anode of first diode,
And its second end is then coupled to the OCP/OVP pins；And
One 3rd resistor, its first end is coupled to the source electrode and the first resistor of the N-type power switch
First end, and its second end is then coupled to the OCP/OVP pins.
4. increasing apparatus as claimed in claim 2, wherein first diode are a Schottky two
Pole pipe.
5. increasing apparatus as claimed in claim 2, wherein：
In the pulse-width modulation signal enable, the control chip passes through the OCP/OVP pins to detect
The cross-pressure of the first resistor, and in response to the first resistor cross-pressure and to the boost type Power convert
Circuit carries out the overcurrent protection detection, thus judges whether to start the over current protection protection mechanism；And
Whenever the overcurrent protection reference built-in more than the control chip of the cross-pressure of the first resistor
During voltage, then the control chip starts the over current protection protection mechanism, thus progressively reduces the PWM
The dutycycle of signal, until the dutycycle of the pulse-width modulation signal be reduced to a minimum duty cycle or
The cross-pressure of the first resistor is less than untill the overcurrent protection reference voltage.
6. increasing apparatus as claimed in claim 2, wherein：
In the pulse-width modulation signal forbidden energy, the control chip passes through the OCP/OVP pins to detect
The anode voltage of first diode, and in response to first diode anode voltage and to the liter
Pressure type power conversion circuit carries out the overvoltage protection detection, thus judges whether that starting the overvoltage protects
Protection mechanism；And
Whenever the anode voltage of first diode overvoltage built-in more than the control chip is protected
During shield reference voltage, then the control chip starts the overvoltage protection mechanism, thus by the PWM
One next dutycycle of signal is adjusted to a minimum duty cycle, until the anode voltage of first diode
Untill the overvoltage protection reference voltage.
7. increasing apparatus as claimed in claim 2, wherein control chip draws with more an INN
Pin, and the increasing apparatus further include：
One feedback line, is coupled between the negative electrode of the LED load and the INN pins, uses
The feedback voltage that the LED load is associated with to provide gives the control chip,
Wherein, the control chip adjusts the pulse-width modulation signal more in response to the feedback voltage, thus
The boost type power conversion circuit is controlled stably to provide the VD.
8. increasing apparatus as claimed in claim 7, wherein feedback line includes：
One first feedback resistance, its first end is coupled to the negative electrode of the LED load, and its
Two ends are then coupled to the earthing potential；And
One second feedback resistance, its first end is coupled to the negative electrode of the LED load, and its
Two ends are then coupled to the INN pins.
9. increasing apparatus as claimed in claim 7, the wherein control chip are answered with more one second
Functional pin is closed, the second complex function pin is a CMP/EA pins, and the increasing apparatus more wrap
Include：
One resistance capacitance networking, is coupled to the CMP/EA pins, and it is configured to compensation and is somebody's turn to do
An offset voltage on CMP/EA pins, thus stablizes the pulse-width modulation signal, and then stablize the liter
The VD that pressure type power conversion circuit is provided；And
One enable/light modulation circuit, is coupled to the CMP/EA pins, and it is configured so that the control
Chip possesses a chip enable function and a dimming function,
Wherein, when the control chip does not receive the feedback voltage from the feedback line, then should
Offset voltage can be gradually ramped up to a predetermined maximum voltage level from a normal operation level,
Wherein, when the offset voltage maintains the predetermined maximum voltage level up to a Preset Time,
Then the control chip can enter a closed mode.
10. increasing apparatus as claimed in claim 2, wherein control chip has more：One OUT
Pin, couples the grid of the N-type power switch to export the pulse-width modulation signal；One VDD pins,
It is used to the DC input voitage needed for receiving operation；And a GND pin, it is coupled to the ground connection
Current potential.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510475903.XA CN106712502A (en) | 2015-08-06 | 2015-08-06 | Voltage boosting device integrating overcurrent protection detection and overvoltage protection detection |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510475903.XA CN106712502A (en) | 2015-08-06 | 2015-08-06 | Voltage boosting device integrating overcurrent protection detection and overvoltage protection detection |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN106712502A true CN106712502A (en) | 2017-05-24 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201510475903.XA Pending CN106712502A (en) | 2015-08-06 | 2015-08-06 | Voltage boosting device integrating overcurrent protection detection and overvoltage protection detection |
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| Country | Link |
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| CN (1) | CN106712502A (en) |
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