CN104426367A - Boost apparatus with over-current and over-voltage protection function - Google Patents
Boost apparatus with over-current and over-voltage protection function Download PDFInfo
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- CN104426367A CN104426367A CN201310366064.9A CN201310366064A CN104426367A CN 104426367 A CN104426367 A CN 104426367A CN 201310366064 A CN201310366064 A CN 201310366064A CN 104426367 A CN104426367 A CN 104426367A
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- control chip
- increasing apparatus
- resistance
- diode
- pulse
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
- H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
- H02M3/10—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M3/145—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M3/155—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/156—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators
- H02M3/157—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators with digital control
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/10—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers
- H02H7/12—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers for static converters or rectifiers
- H02H7/1213—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers for static converters or rectifiers for DC-DC converters
Abstract
The invention discloses a boost apparatus suitable for providing direct-current (DC) output voltage for a load. The boost apparatus comprises a boost power conversion circuit and a control chip. The boost power conversion circuit comprises a diode coupled to a load, and is configured to receive DC input voltage and provide DC output voltage for the load in response to a pulse width modulation signal. The control chip is coupled to the boost power conversion circuit, and is configured to generate a pulse width modulation signal to control the operation of the boost power conversion circuit, and stop outputting a pulse width modulation signal and enter a closed state when the diode has an open-circuit or short-circuit fault, so as to protect the boost apparatus and/or the load from damage.
Description
Technical field
The present invention relates to a kind of Power convert and provisioning technique, and in particular to a kind of increasing apparatus with overcurrent and over-voltage protection function.
Background technology
Based on existing employing pulse-width modulation framework, the increasing apparatus (boostapparatus) of (PWM-based) can be configured to provide VD to use to load.But, when being positioned at diode either open or the short circuit of outlet side (or output) in increasing apparatus, the power switch be positioned in increasing apparatus on power toggle path all likely can be caused to damage (such as short circuit), thus cause the damage of increasing apparatus inner member and/or load, or application is caused to have power supply short circuit and the damage of the system of increasing apparatus.
Summary of the invention
In view of this, the invention provides one and can detect whether the diode being positioned at outlet side (or output) increasing apparatus of open circuit or short circuit occurs, effectively to solve the problem that prior art is addressed.
Other objects of the present invention and advantage can be further understood from the technical characteristic disclosed by the present invention.
In this, an one exemplary embodiment of the present invention provides a kind of being suitable for provide a VD to the increasing apparatus of load, and it comprises: boost type power conversion circuit and control chip.Wherein, boost type power conversion circuit comprises and the diode of load coupled (it is positioned at the outlet side/output of increasing apparatus), and it is configured to reception one DC input voitage, and provide described VD to load in response to a pulse-width signal.Control chip couples boost type power conversion circuit, and it is configured to: produce described pulse-width signal to control the running of boost type power conversion circuit; And when described diode either open or short circuit, stop exporting described pulse-width signal and entering closed condition, thus protection increasing apparatus and/or load avoid damage.
In an one exemplary embodiment of the present invention, boost type power conversion circuit can also comprise: inductance, electric capacity, N-type power switch, and the first resistance.Wherein, the first end of inductance is for receiving described DC input voitage, and the second end of inductance is then coupled to the anode of described diode, and the negative electrode of described diode can be coupled to load and provide described VD to load.The first end of electric capacity couples the negative electrode of described diode, and the second end of electric capacity is then coupled to earthing potential.The drain electrode of N-type power switch couples the anode of described diode, and the grid of N-type power switch is then for receiving described pulse-width signal.The first end of the first resistance couples the source electrode of N-type power switch, and the second end of the first resistance is then coupled to described earthing potential.
In an one exemplary embodiment of the present invention, control chip can in have an acquiescence overcurrent protection reference voltage and there is an overcurrent protection being coupled to the first end of the first resistance and detect pin position.With this understanding, when flowing through the overcurrent of the first resistance, the cross-pressure of the first resistance can, higher than described acquiescence overcurrent protection reference voltage, stop making control chip exporting described pulse-width signal.Even, when described shorted diode, the cross-pressure of the first resistance also can, higher than described acquiescence overcurrent protection reference voltage, stop making control chip exporting described pulse-width signal and entering described closed condition.
In an one exemplary embodiment of the present invention, boost type power conversion circuit can also comprise: the second resistance and the 3rd resistance.Wherein, the first end of the second resistance couples the negative electrode of described diode.The first end of the 3rd resistance couples the second end of the second resistance, and the second end of the 3rd resistance is then coupled to described earthing potential.In addition, control chip can also in have an acquiescence overvoltage protection reference voltage and there is an overvoltage protection being coupled to the first end of the 3rd resistance and detect pin position.With this understanding, when described VD overvoltage, the cross-pressure of the 3rd resistance can, higher than described acquiescence overvoltage protection reference voltage, stop making control chip exporting described pulse-width signal.Even, under increasing apparatus is in normal operation, when described diode open-circuit, the cross-pressure of the 3rd resistance can lower than a setting voltage, and control chip can continue in response to the open circuit of described diode to export the described pulse-width signal with maximum duty cycle.When the cross-pressure of the 3rd resistance lower than described setting voltage and the described pulse-width signal with maximum duty cycle continues to be output time, then control chip can stop exporting described pulse-width signal and enter described closed condition.
Based on above-mentioned; the increasing apparatus that the present invention carries can when the diode either open or the short circuit that are positioned at outlet side/output; make control chip starting protection mechanism to stop the pulse-width signal of the running exported for controlling boost type power conversion circuit, and enter to closed condition.Thus, the N-type power switch be positioned on power toggle path can be avoided to cause the damage of such as short circuit, thus avoid increasing apparatus inner member and/or load to cause damage, or avoid the system applying increasing apparatus to cause power supply short circuit and damage.
For above-mentioned feature and advantage of the present invention can be become apparent, special embodiment below, and coordinate institute's accompanying drawings to be described in detail below.
However, it is appreciated that above-mentioned general description and following embodiment are only exemplary and illustrative, its can not limit the present invention for advocate scope.
Accompanying drawing explanation
Institute's accompanying drawings is below a part for specification of the present invention, which show example embodiment of the present invention, and institute's accompanying drawings illustrates principle of the present invention together with the description of specification.
Fig. 1 is the system block diagrams of the increasing apparatus 10 of the present invention one one exemplary embodiment;
Fig. 2 is the enforcement schematic diagram of the increasing apparatus 10 of Fig. 1.
[description of reference numerals]
10: increasing apparatus
101: boost type power conversion circuit
103: control chip
105: resistance-capacitance network
20: load
L: inductance
Q:N type power switch
D: diode
C: electric capacity
Rcs, R1, R2: resistance
DC_IN: DC input voitage
DC_OUT: VD
VRCS, VR2: cross-pressure
Vfb: feedback voltage
Vocp_ref: acquiescence overcurrent protection reference voltage
Vovp_ref: acquiescence overvoltage protection reference voltage
IRCS: electric current
GPW: pulse-width signal
VDD: power supply pin
GND: grounding leg position
OVP: overvoltage protection detects pin position
OCP: overcurrent protection detects pin position
OUT: output pin position
CMP: compensate pin position
INN: feedback pin position
EA: chip enable pin position
Embodiment
For making the object, technical solutions and advantages of the present invention clearly understand, below in conjunction with specific embodiment, and with reference to accompanying drawing, the present invention is described in further detail.All may part, in graphic and execution mode, use the element/component of identical label to represent identical or similar portions.
Fig. 1 is the system block diagrams of the increasing apparatus (boost apparatus) 10 of the present invention one one exemplary embodiment, and Fig. 2 is the enforcement schematic diagram of the increasing apparatus 10 of Fig. 1.Please with reference to Fig. 1 and Fig. 2, increasing apparatus 10 is suitable for providing VD (DC output voltage) DC_OUT to the load 20 of any type.Increasing apparatus 10 comprises: boost type power conversion circuit (boost powerconversion circuit) 101, control chip (control chip) 103, and resistance-capacitance network (RC network) 105.
In this one exemplary embodiment, boost type power conversion circuit 101 can be configured to receive DC input voitage (DC input voltage) DC_IN, and provide VD DC_OUT to load 20 in response to pulse-width signal (pulse-width-modulation signal, the PWM signal) GPW from control chip 103.
For example, boost type power conversion circuit 101 can comprise: the diode D (diode coupled with load 20, such as be positioned at Schottky (Schottky) diode of the outlet side/output of increasing apparatus 10, but be not restricted to this), inductance (inductor) L, electric capacity (capacitor) C, N-type power switch (N-type power switch) Q, and resistance (resistor) (Rcs, R1, R2).Wherein, N-type power switch Q can adopt and implement with N-type power metal-oxide half field effect transistor (N-typepower MOSFET), but is not restricted to this.
The first end of inductance L is used for receiving (or coupling) DC input voitage DC_IN, second end of inductance L is then coupled to the anode (anode) of diode D, and the negative electrode of diode D (cathode) can be coupled to load 20 and provide VD DC_OUT to load 20.The first end of electric capacity C couples the negative electrode of diode D, and second end of electric capacity C is then coupled to earthing potential (0V).
The drain electrode (drain) of N-type power switch Q couples the anode of diode D, and the grid (gate) of N-type power switch Q is then for receiving the pulse-width signal GPW exported from control chip 103.The first end of resistance Rcs couples the source electrode (source) of N-type power switch Q, and second end of resistance Rcs is then coupled to earthing potential.Between the negative electrode that resistance (R1, R2) is serially connected with diode D and earthing potential, that is: the first end of resistance R1 couples second end of first end coupling resistance R1 of the negative electrode of diode D, resistance R2, and second end of resistance R2 is then coupled to earthing potential.
On the other hand; control chip 103 can have multi-feet position; such as: power supply pin VDD, grounding leg position GND, chip enable pin position (chip enable pin) EA, output pin position OUT, overcurrent protection detect pin position OCP, overvoltage protection detection pin position OVP, feedback pin position INN, and compensate pin position CMP.Certainly, based on actual design/application demand, other function pin position can be set up to control chip 103, or delete the existing function pin position of control chip 103.Substantially, in order to control chip 103 will be allowed normally to be operated, power supply pin VDD can receive the DC input voitage DC_IN needed for operation, and grounding leg position GND can be coupled to earthing potential.Thus, control chip 103 can change (such as: lifting/voltage reducing) to obtain the operating voltage needed for its internal circuit (not illustrating) to DC input voitage DC_IN.
In this one exemplary embodiment; control chip 103 couples boost type power conversion circuit 101; and it is configured to: produce pulse-width signal GPW, and controlled the running of boost type power conversion circuit 101 with output pulse width modulation signal GPW by the output pin position OUT of the grid that is coupled to N-type power switch Q; And when open circuit or short circuit occur diode D, stop output pulse width modulation signal GPW and enter closed condition (shutdown/inactivation status), thus protection increasing apparatus 10 and/or load 20 avoid damage.
Clearer, control chip 103 can in have acquiescence overcurrent protection reference voltage (predetermined OCP reference voltage, V
ocp_ref) and acquiescence overvoltage protection reference voltage (predetermined OVP reference voltage, V
ovp_ref), and its overcurrent protection detects the first end that pin position OCP and Zenith tracking pin position OVP distinctly can be coupled to resistance Rcs and R2.
In this one exemplary embodiment, when flowing through the electric current I of resistance Rcs
rcsduring overcurrent, the cross-pressure V of resistance Rcs
rcsunderstand higher than the built-in acquiescence overcurrent protection reference voltage V of control chip 103
ocp_ref.With this understanding, control chip 103 will stop output pulse width modulation signal GPW, to start over current protection protection mechanism.In addition, when diode D short circuit, the cross-pressure V of resistance Rcs
rcscan promote singularly in response to the electric current carrying out self-capacitance C, and can higher than the built-in acquiescence overcurrent protection reference voltage V of control chip 103
ocp_ref.With this understanding, control chip 103 also can stop output pulse width modulation signal GPW and enter closed condition, thus protection increasing apparatus 10 and/or load 20 avoid the impact of the short circuit being subject to diode D and damage.
In addition, when VD DC_OUT overvoltage, the cross-pressure VR2 of resistance R2 can higher than the built-in acquiescence overvoltage protection reference voltage V of control chip 103
ovp_ref.With this understanding, control chip 103 will stop output pulse width modulation signal GPW, to start overvoltage protection mechanism.
In addition, under increasing apparatus 10 is in normal operation, when diode D opens a way, the cross-pressure V of resistance R2
r2the cause that cannot be able to be established in response to VD DC_OUT and lower than a setting voltage (such as: 60mV, but be not restricted to this).And, control chip 103 also can continue output and have maximum duty cycle (maximum dutycycle in response to the open circuit of diode D, such as: 95%, but be not restricted to this) pulse-width signal GPW (cause because being output without VD DC_OUT).
Therefore, as the cross-pressure V of resistance R2
r2lower than setting voltage (such as: 60mV; but be not restricted to this); and there is maximum duty cycle (such as: 95%; but be not restricted to this) pulse-width signal GPW when continuing to be output; then control chip 103 will judge that diode D opens a way; to stop output pulse width modulation signal GPW and to enter closed condition, thus protection increasing apparatus 10 and/or load 20 avoid the impact of the open circuit being subject to diode D and damage.
On the other hand, for maintaining the stability of increasing apparatus 10, in this one exemplary embodiment, resistance-capacitance network 105 (such as: the resistance capacitance of serial connection, but be not restricted to this) can be coupled to the compensation pin position CMP (or being configured between the compensation pin position CMP of control chip 103 and earthing potential) of control chip 103.In practical application, resistance-capacitance network 105 can be configured to the pulse-width signal GPW that stability contorting chip 105 exports, and then the VD DC_OUT that stable boost type power conversion circuit 101 provides.Moreover control chip 103 is also associated with feedback voltage (feedback voltage, the V of VD DC_OUT or load 20 with reception by its feedback pin position INN
fb), to adjust VD DC_OUT to default value/set point/set value.
In addition, one and control chip 103 in response to the open circuit of diode D or short circuit or the words entering closed condition in response to overcurrent or superpotential phenomenon, then the outside chip enable pin position EA by control chip 103 is to reset (reset) control chip 103, returns to opening (activation status) to make control chip 103 from closed condition.
In sum; when can there is open circuit or short circuit at the diode D being positioned at outlet side/output in the increasing apparatus 10 that the present invention carries; make control chip 103 starting protection mechanism to stop the pulse-width signal GPW of the running exported for controlling boost type power conversion circuit 101, and enter to closed condition.Thus, the N-type power switch Q be positioned on power toggle path can be avoided to cause the damage of such as short circuit, thus avoid increasing apparatus 10 inner member and/or load 20 to cause damage, or the system applying increasing apparatus 10 is avoided to cause power supply short circuit and damage.
It is worth mentioning that at this, if load 20 is LED load (LED load), then increasing apparatus 10 can be applied in the backlight driver (backlightdriving) in liquid crystal display (LCD) field; In addition, if load 20 is the words of Circuits System load (circuit system load), then increasing apparatus 10 can be applied in the constant voltage supply (constantvoltage supplying) in Power convert field, but the range of application of increasing apparatus 10 that this one exemplary embodiment is carried is not as restriction.
Above-described specific embodiment; object of the present invention, technical scheme and beneficial effect are further described; be understood that; the foregoing is only specific embodiments of the invention; be not limited to the present invention; within the spirit and principles in the present invention all, any amendment made, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (13)
1. an increasing apparatus, be suitable for providing a VD to a load, this increasing apparatus comprises:
One boost type power conversion circuit, comprise the diode of one and this load coupled, and it is configured to reception one DC input voitage, and provides this VD to this load in response to a pulse-width signal; And
One control chip, couple this boost type power conversion circuit, and it is configured to: produce this pulse-width signal to control the running of this boost type power conversion circuit; And when this diode either open or short circuit, stop exporting this pulse-width signal and entering a closed condition, thus this increasing apparatus and/or this load is protected to avoid damage.
2. increasing apparatus as claimed in claim 1, wherein this boost type power conversion circuit also comprises:
One inductance, its first end is for receiving this DC input voitage, and its second end is then coupled to the anode of this diode, and wherein the negative electrode of this diode is coupled to this load and provides this VD to this load;
One electric capacity, its first end couples the negative electrode of this diode, and its second end is then coupled to an earthing potential;
One N-type power switch, its drain electrode couples the anode of this diode, and its grid is then for receiving this pulse-width signal; And
One first resistance, its first end couples the source electrode of this N-type power switch, and its second end is then coupled to this earthing potential.
3. increasing apparatus as claimed in claim 2, wherein this diode is a Schottky diode.
4. increasing apparatus as claimed in claim 2, wherein:
Have an acquiescence overcurrent protection reference voltage in this control chip and there is an overcurrent protection being coupled to the first end of this first resistance and detect pin position; And
When flowing through the overcurrent of this first resistance, the cross-pressure of this first resistance can, higher than this acquiescence overcurrent protection reference voltage, stop making this control chip exporting this pulse-width signal.
5. increasing apparatus as claimed in claim 2, wherein when this shorted diode, the cross-pressure of this first resistance can, higher than this acquiescence overcurrent protection reference voltage, stop making this control chip exporting this pulse-width signal and entering this closed condition.
6. increasing apparatus as claimed in claim 2, wherein this boost type power conversion circuit also comprises:
One second resistance, its first end couples the negative electrode of this diode; And
One the 3rd resistance, its first end couples the second end of this second resistance, and its second end is then coupled to this earthing potential.
7. increasing apparatus as claimed in claim 6, wherein:
Have an acquiescence overvoltage protection reference voltage in this control chip and there is an overvoltage protection being coupled to the first end of the 3rd resistance and detect pin position; And
When this VD overvoltage, the cross-pressure of the 3rd resistance can, higher than this acquiescence overvoltage protection reference voltage, stop making this control chip exporting this pulse-width signal.
8. increasing apparatus as claimed in claim 6, wherein:
Under this increasing apparatus is in a normal operation, when this diode open-circuit, the cross-pressure of the 3rd resistance can lower than a setting voltage, and this control chip can continue in response to the open circuit of this diode to export this pulse-width signal with a maximum duty cycle; And
When the cross-pressure of the 3rd resistance lower than this setting voltage and this pulse-width signal with this maximum duty cycle continues to be output time, then this control chip can stop exporting this pulse-width signal and enter this closed condition.
9. increasing apparatus as claimed in claim 2, wherein this control chip has an output pin position, couples the grid of this N-type power switch to export this pulse-width signal.
10. increasing apparatus as claimed in claim 1, wherein this control chip has a compensation pin position, and this increasing apparatus also comprises:
One resistance-capacitance network, couples this compensation pin position, and it is configured to make this boost type power conversion circuit stably provide this VD.
11. increasing apparatus as claimed in claim 1, wherein this control chip has a feedback pin position to receive the feedback voltage being associated with this VD or this load, to adjust this VD.
12. increasing apparatus as claimed in claim 1, wherein this control chip has a chip enable pin position and returns to an opening for an outside resets this control chip from this closed condition.
13. increasing apparatus as claimed in claim 1, wherein: this control chip has a power supply pin with this DC input voitage needed for reception operation; And this control chip also has a grounding leg position to be coupled to this earthing potential.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310366064.9A CN104426367A (en) | 2013-08-20 | 2013-08-20 | Boost apparatus with over-current and over-voltage protection function |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310366064.9A CN104426367A (en) | 2013-08-20 | 2013-08-20 | Boost apparatus with over-current and over-voltage protection function |
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| Publication Number | Publication Date |
|---|---|
| CN104426367A true CN104426367A (en) | 2015-03-18 |
Family
ID=52974539
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310366064.9A Pending CN104426367A (en) | 2013-08-20 | 2013-08-20 | Boost apparatus with over-current and over-voltage protection function |
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Cited By (4)
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| CN108574518A (en) * | 2017-03-10 | 2018-09-25 | 意法半导体(鲁塞)公司 | Protection to the resistance overvoltage of NFC routers |
| CN109599842B (en) * | 2018-12-11 | 2021-02-26 | 惠科股份有限公司 | Power supply control circuit, display device and power supply control method |
| CN112448466A (en) * | 2019-09-04 | 2021-03-05 | 台达电子工业股份有限公司 | DC non-power-off power supply device with bidirectional protection function |
| CN113258537A (en) * | 2021-07-15 | 2021-08-13 | 上海芯龙半导体技术股份有限公司 | Open circuit protection circuit, switching power supply chip and switching power supply system |
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| CN108574518B (en) * | 2017-03-10 | 2021-07-02 | 意法半导体(鲁塞)公司 | Protection against overvoltage for NFC routers |
| CN109599842B (en) * | 2018-12-11 | 2021-02-26 | 惠科股份有限公司 | Power supply control circuit, display device and power supply control method |
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Application publication date: 20150318 |