CN105099182B - Realize the switch power converter of fast current detecting - Google Patents
Realize the switch power converter of fast current detecting Download PDFInfo
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- CN105099182B CN105099182B CN201410153339.5A CN201410153339A CN105099182B CN 105099182 B CN105099182 B CN 105099182B CN 201410153339 A CN201410153339 A CN 201410153339A CN 105099182 B CN105099182 B CN 105099182B
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Abstract
The present invention relates to electronic technology field, and in particular to a kind of switch power converter.The switch power converter of fast current detecting is realized, including, a switching device, to cause switched voltage output to switch between an input terminal voltage and ground according to a comparator output signal and a clock signal；One current detecting branch road, for producing a current detection signal；One voltage current adapter, being converted to current signal according to an error amplification signal, there is provided give current detecting branch road；One comparator, the output voltage according to current detection signal and switching device is compared generation comparator output signal.The present invention is simple in construction, it is possible to achieve fast current detecting, realizes to the effective control of Switching Power Supply and protection.
Description
Technical field
The present invention relates to electronic technology field, and in particular to a kind of switch power converter.
Background technology
The characteristics such as high efficiency, the low-power consumption of Switching Power Supply cause it has in portable electronic device market irreplaceable
Status, in addition to performance will meet the requirement of powered products, the safeguard measure of power supply itself is also extremely important, and overcurrent protection is
It is to prevent switching power source chip one of safeguard procedures of accidental damage caused by overload or output short-circuit.And current detection circuit
It is the key modules of overcurrent protection, is timely and effectively detected by the electric current of convection current overpower switching tube, effectively to enter
The control of row switch and overcurrent protection, reach the purpose of protection chip and peripheral component.
In traditional current detection technology, a kind of the more commonly used electric current detecting method is a resistance of connecting in circuit
The precision resistance for being worth very little is realized in detection, a kind of circuit topology, by the way that the accurate current detecting of a resistance very little is electric
Resistance is connected with main power tube, and electric current flows through current sense resistor and produces a pressure drop, then amplifies this by an operational amplifier
Small pressure drop, so that the electric current of power tube is detected, but this method can introduce extra power attenuation, influence the effect of system
Rate and increase cost.
Another electric current detecting method is microscope testing method, by setting a sampling transistor in parallel with main power tube,
The raceway groove effective width of main power tube is more than 1000 times of sampling transistor, the source electrode of main power tube and the source of sampling transistor
It is connected after the connection of pole with input voltage, the grid of main power tube is connected with the grid of sampling transistor, the leakage of main power tube
The drain electrode of pole and sampling transistor connects the input of an operational amplifier respectively, by setting operational amplifier to be adopted for guarantee
The drain voltage of sample transistor AND gate main power tube is equal, the size of current of sampling transistor be it is scaled after main power
Tube current size, however, the precision of this detection method depends on the matching performance of current mirror, while the foundation of operational amplifier
Time can cause main power tube M1 conductings to need minimum time, cause detection speed excessively slow and be easy to error.
The content of the invention
It is an object of the present invention to provide a kind of switch power converter for realizing fast current detecting, solves above skill
Art problem.
Technical problem solved by the invention can be realized using following technical scheme：
The switch power converter of fast current detecting is realized, wherein, including,
One switching device unit, to cause output voltage in an input voltage according to a comparison signal and a clock signal
Switch between ground；
One current detecting branch road, for producing a voltage signal under the driving of a current signal；
One voltage-current converter, producing the current signal according to an error amplification signal, there is provided give electric current inspection
Survey branch road；
One comparator, it is described that the output voltage according to the voltage signal and the switching device unit is compared generation
Comparison signal.
Preferably, in addition to an error amplifier, to be compared to a voltage feedback signal with a reference voltage, obtain
To the error amplification signal.
Preferably, series connection one detects power tube on the current detecting branch road.
Preferably, the detection power tube uses N-channel MOS pipe；The drain electrode of the detection power tube connects the input
Voltage, the source electrode of the detection power tube connects the output end of the voltage-current converter.
Preferably, in addition to an oscillator, according to the voltage feedback signal and the comparative result of one second reference voltage
A high-frequency signal or a low-frequency signals are selectively exported, institute is used as using the high-frequency signal or the low-frequency signals
State clock signal.
Preferably, the oscillator is additionally operable to export a slope compensation signal, and the slope compensation signal is cumulative by one
Device with the error amplification signal be supplied to the input of the voltage-current converter after adding up.
Preferably, the switching device unit includes a trigger and a driver element, an input of the trigger
The end connection comparison signal；Another input of the trigger connects the clock signal, the trigger output control
Signal is to the driver element.
Preferably, the driver element includes a first switch device and a second switch device, the first switch device
Part and the second switch device alternate conduction or cut-off in the presence of the control signal so that the first switch device
Conducting and the second switch device cut-off when, the output voltage be input voltage；The second switch break-over of device and institute
When stating the cut-off of first switch device, the output voltage ground connection.
Preferably, the first switch device and second switch device use N-channel MOS pipe, the first switch device
The raceway groove effective width of part is M times of the detection power tube, and wherein M value is 1000 to 10000.
Preferably, the grid of the detection power tube connects a high level or the control signal with the first switch device
Connection.
Beneficial effect：Due to using above technical scheme, the present invention is simple in construction, it is possible to achieve fast current detecting, real
Now to the effective control of Switching Power Supply and protection.
Brief description of the drawings
Fig. 1 is circuit diagram of the invention.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clear, complete
Site preparation is described, it is clear that described embodiment is only a part of embodiment of the invention, rather than whole embodiments.It is based on
Embodiment in the present invention, those of ordinary skill in the art obtained on the premise of creative work is not made it is all its
His embodiment, belongs to the scope of protection of the invention.
It should be noted that in the case where not conflicting, the embodiment in the present invention and the feature in embodiment can phases
Mutually combination.
The invention will be further described with specific embodiment below in conjunction with the accompanying drawings, but not as limiting to the invention.
Reference picture 1, realizes the switch power converter of fast current detecting, wherein, including,
One switching device unit, to cause output voltage in an input voltage according to a comparison signal and a clock signal
Switch between ground；
One current detecting branch road, for producing a voltage signal under the driving of a current signal, the voltage signal is with VL
Represent, i.e. L point voltages in Fig. 1；
One voltage-current converter V-i, producing current signal according to an error amplification signal, there is provided give current detecting branch
Road；
One comparator 7, the output voltage according to voltage signal and switching device unit is compared generation comparison signal.
The input voltage of the present invention is provided by Input voltage terminal IN；Ground is provided by earth terminal GND；
As a kind of preferred embodiment of the present invention, in addition to an error amplifier 6, to a voltage feedback signal
FB is compared with a reference voltage, obtains error amplification signal.The voltage feedback signal FB of the present invention can pass through a feedback
Real-time performance, feedback network may connect between output voltage and ground, and reference voltage can use 0.923V.
As a kind of preferred embodiment of the present invention, series connection one detects power tube M1_ssnse on current detecting branch road.
Detection power tube M1_ssnse can use P-channel metal-oxide-semiconductor or N-channel MOS pipe, it is preferred to use N-channel MOS pipe；Detect power
Pipe M1_ssnse drain electrode connection input voltage IN, detection power tube M1_ssnse source electrode connection voltage-current converter V-i
Output end.Because the conducting resistance of N-channel MOS pipe is smaller, usually 1/3rd or so of P-channel metal-oxide-semiconductor, using N ditches
The chip of road metal-oxide-semiconductor can be than taking smaller area using P-channel metal-oxide-semiconductor, with smaller conduction loss.
As a kind of preferred embodiment of the present invention, in addition to an oscillator 3, according to voltage feedback signal and one second
The comparative result of reference voltage selectively exports a high-frequency signal or a low-frequency signals, with high-frequency signal or low frequency
Signal is used as clock signal.Realization can be compared by one second comparator 12, the second reference voltage can be selected as 0.3V.When
When voltage feedback signal FB is less than 0.3V, oscillator 3 works in low frequency output mode, when voltage feedback signal FB is higher than 0.3V
When, oscillator 3 works in high-frequency output mode.
As a kind of preferred embodiment of the present invention, oscillator 3 is additionally operable to export a slope compensation signal RAMP, slope
Thermal compensation signal RAMP carries out being supplied to voltage-current converter V-i's after adding up by an accumulator ∑ and error amplification signal
Input.
As a kind of preferred embodiment of the present invention, switching device unit includes a trigger 8 and a driver element, touches
Send out the input connection comparison signal of device 8；Another input connection clock signal of trigger 8, trigger 8 exports two
Complementary control signal is to driver element.Preferably, trigger 8 can use rest-set flip-flop, and the R ends connection of rest-set flip-flop is compared
Signal, the S ends connection clock signal of rest-set flip-flop, rest-set flip-flop provides Q ends and Q negative terminal signals to driver element respectively.
As a kind of preferred embodiment of the present invention, driver element includes a first switch device M1 and a second switch
Device M2, first switch device M1 and second switch device M2 alternate conduction or cut-off in the presence of control signal so that the
One switching device M1 turn on and second switch device M2 cut-off when, output voltage is input voltage；Second switch device M2 is turned on
And during first switch device M1 cut-offs, output voltage ground connection.As shown in figure 1, SW ends are output voltage node.
As a kind of preferred embodiment of the present invention, driver element also includes the first driver 9 and the second driver 10,
First driver 9 be located between trigger 8 and first switch device M1 control end, the second driver 10 be located at trigger 8 with
Between second switch device M2 control end, the first driver 9 connects a high-end voltage end and a lower terminal voltage end, in control letter
The voltage of high-end voltage end is provided in the presence of number to first switch device M1 control end or the voltage at lower terminal voltage end to control
End processed.Using the BOOT ends in scheming as high-end voltage end, lower terminal voltage end is used as using SW ends in scheming；Second driver 10 can be
One buffer.
BOOT ends are Bootstrap end, by a diode D1 connection 5V supply voltages, in practical application, BOOT ends and SW
An electric capacity is also connected between end, 5V supply voltages are charged by diode D1 to electric capacity, to provide driving first switch device M1
The high level of conducting.
As a kind of preferred embodiment of the present invention, first switch device M1 and second switch device M2 use N ditches
Road metal-oxide-semiconductor, first switch device M1 raceway groove effective width is detect power tube M times, wherein M value for 1000 to
10000。
As a kind of preferred embodiment of the present invention, detection power tube M1_ssnse grid connect a high level or with
First switch device M1 control signal connection.BOOT ends can such as be connected.
It is interior for providing present invention additionally comprises an inside voltage regulator module 4 as a kind of preferred embodiment of the present invention
Voltage needed for portion's functional module and/or function voltage, such as provide the 5V supply voltages of the present invention.
As a kind of preferred embodiment of the present invention, present invention additionally comprises a shut-off comparator 13, when Enable Pin EN is defeated
Enter and be less than a setting value, such as setting value can be 1.3V, turn off main modular.
As a kind of preferred embodiment of the present invention, present invention additionally comprises soft starting circuit 5, soft starting circuit 5 it is defeated
Go out end connection error amplifier 6, for it is electric on the input of circuit when, make the slow lifting of output of error amplifier, allow and be
System progresses into stable working condition, can control the output voltage rate of climb, reduces input dash current, adjusts sequential.
Once system starts, soft starting circuit will no longer have an effect.
As a kind of preferred embodiment of the present invention, present invention additionally comprises a compensation network, error amplifier is connected to
Output end and comparator input between, compensation network use R1, C1, C2 constitute compensation network.R1, C1, C2 are selected
Suitable size will not be repeated here with ensuring the stability of circuit operation.
As a kind of preferred embodiment of the present invention, in addition to an overvoltage comparator 11, according to voltage feedback signal FB
It is compared with one the 3rd reference voltage, produces an overvoltage protection signal OVP.3rd reference voltage can be 1.1V.
As a kind of preferred embodiment of the present invention, in addition to a protection circuit unit, such as by logic gate, this
Locate as OR gate 14, when voltage feedback signal FB is more than three reference voltages or input voltage to be less than 3.75 or Enable Pin EN be one
It is whole to protect when at least one condition in low level signal is met so that switching tube M4 is turned on, and realizes voltage turn-off function
Circuit.
The present invention is compared to the difference between reference voltage and feedback voltage FB by error amplifier 1, amplified, and is obtained
To error amplification signal；Error amplification signal is carried out after slope compensation with slope compensation signal, via voltage-current converter V-
I is converted to current signal and is supplied to detection power tube M1_ssnse, and power tube M1_ssnse is under the driving of current signal for detection
Produce a voltage signal VL, comparator 7 is to voltage signal VLIt is compared with switching node SW voltage so that voltage signal VL
Switching node SW voltage is followed, meanwhile, current signal also helps the action that current detecting branch road rapidly enters next cycle.
Under initial conditions of the present invention, voltage signal VLLess than switching node SW voltages, comparator 7 is output as low level,
Under one rising edge signal function, the output end Q ends output high level signal of rest-set flip-flop, first switch device M1 conductings,
First switch device M1 electric currents persistently increase, voltage signal VLDuring voltage signal more than switching node SW, the upset production of comparator 7
Raw low level, the output end Q ends output low level signal of rest-set flip-flop, first switch device M1 shut-offs, second switch device M2
Conducting, go round and begin again realization circulation, when the moment that comparator 7 is overturn, voltage signal VLWith switching node SW voltage signal phase
Deng realizing current detecting and circuit and control.
Preferred embodiments of the present invention are the foregoing is only, embodiments of the present invention and protection model is not thereby limited
Enclose, to those skilled in the art, should can appreciate that made by all utilization description of the invention and diagramatic content
Scheme obtained by equivalent substitution and obvious change, should be included in protection scope of the present invention.
Claims (10)
1. realize the switch power converter of fast current detecting, it is characterised in that including,
One switching device unit, to cause output voltage on an input voltage and ground according to a comparison signal and a clock signal
Between switch；
One current detecting branch road, for producing a voltage signal under the driving of a current signal；
One voltage-current converter, producing the current signal according to an error amplification signal, there is provided to the current detecting branch
Road；
One comparator, the output voltage according to the voltage signal and the switching device unit is compared the generation comparison
Signal.
2. the switch power converter according to claim 1 for realizing fast current detecting, it is characterised in that also including one
Error amplifier, to be compared to a voltage feedback signal with a reference voltage, obtains the error amplification signal.
3. the switch power converter according to claim 1 for realizing fast current detecting, it is characterised in that the electric current
Series connection one detects power tube in detection branch.
4. the switch power converter according to claim 3 for realizing fast current detecting, it is characterised in that the detection
Power tube uses N-channel MOS pipe；The drain electrode of the detection power tube connects the input voltage, the source of the detection power tube
Pole connects the output end of the voltage-current converter.
5. the switch power converter according to claim 2 for realizing fast current detecting, it is characterised in that also including one
Oscillator, the comparative result according to the voltage feedback signal and one second reference voltage selectively exports a high-frequency signal
Or low-frequency signals, the clock signal is used as using the high-frequency signal or the low-frequency signals.
6. the switch power converter according to claim 5 for realizing fast current detecting, it is characterised in that the vibration
Device is additionally operable to export a slope compensation signal, and the slope compensation signal is carried out by an accumulator and the error amplification signal
The input of the voltage-current converter is supplied to after cumulative.
7. the switch power converter according to claim 3 for realizing fast current detecting, it is characterised in that the switch
Device cell includes a trigger and a driver element, and an input of the trigger connects the comparison signal；It is described
Another input of trigger connects the clock signal, and the trigger outputs control signals to the driver element.
8. the switch power converter according to claim 7 for realizing fast current detecting, it is characterised in that the driving
Unit includes a first switch device and a second switch device, and the first switch device and the second switch device are in institute
State alternate conduction or cut-off in the presence of control signal so that the first switch break-over of device and the second switch device are cut
When only, the output voltage is input voltage；The second switch break-over of device and the first switch device cut-off when, it is described
Output voltage is grounded.
9. the switch power converter according to claim 8 for realizing fast current detecting, it is characterised in that described first
Switching device and second switch device use N-channel MOS pipe, and the raceway groove effective width of the first switch device is the inspection
The value of M times of power scale pipe, wherein M is 1000 to 10000.
10. the switch power converter according to claim 8 for realizing fast current detecting, it is characterised in that the inspection
The grid of power scale pipe connects a high level or is connected with the control signal of the first switch device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201410153339.5A CN105099182B (en) | 2014-04-16 | 2014-04-16 | Realize the switch power converter of fast current detecting |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410153339.5A CN105099182B (en) | 2014-04-16 | 2014-04-16 | Realize the switch power converter of fast current detecting |
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| CN105099182A CN105099182A (en) | 2015-11-25 |
| CN105099182B true CN105099182B (en) | 2017-11-07 |
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| CN109738831A (en) * | 2018-12-04 | 2019-05-10 | 广州市扬新技术研究有限责任公司 | A kind of electrical two self-locking station pressure-adjusting type Switching Power Supply wiring board detection circuits of band |
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| US6906536B2 (en) * | 2003-04-02 | 2005-06-14 | Intersil Americans Inc. | Time division multiplexed, piloted current monitoring in a switched mode DC—DC voltage converter and phase current measurement calibration for a multiphase converter |
| US6995483B2 (en) * | 2002-10-15 | 2006-02-07 | Texas Instruments Incorporated | Synchronous buck and boost regulator power reduction circuit using high side sensing |
| CN101364767A (en) * | 2007-08-08 | 2009-02-11 | 株式会社瑞萨科技 | Semiconductor circuit and switching power supply apparatus |
| CN203813662U (en) * | 2014-04-16 | 2014-09-03 | 钰太芯微电子科技（上海）有限公司 | Switch power supply converter achieving rapid current detection |
-
2014
- 2014-04-16 CN CN201410153339.5A patent/CN105099182B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6995483B2 (en) * | 2002-10-15 | 2006-02-07 | Texas Instruments Incorporated | Synchronous buck and boost regulator power reduction circuit using high side sensing |
| US6906536B2 (en) * | 2003-04-02 | 2005-06-14 | Intersil Americans Inc. | Time division multiplexed, piloted current monitoring in a switched mode DC—DC voltage converter and phase current measurement calibration for a multiphase converter |
| CN101364767A (en) * | 2007-08-08 | 2009-02-11 | 株式会社瑞萨科技 | Semiconductor circuit and switching power supply apparatus |
| CN203813662U (en) * | 2014-04-16 | 2014-09-03 | 钰太芯微电子科技（上海）有限公司 | Switch power supply converter achieving rapid current detection |
Non-Patent Citations (1)
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| 基于同步整流技术的高效DC-DC变换器芯片的设计;路小月;《中国优秀硕士学位论文全文数据库 工程科技Ⅱ辑 》;20130215(第2期);第39-39页 * |
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