CN203813662U - Switch power supply converter achieving rapid current detection - Google Patents
Switch power supply converter achieving rapid current detection Download PDFInfo
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- CN203813662U CN203813662U CN201420185326.1U CN201420185326U CN203813662U CN 203813662 U CN203813662 U CN 203813662U CN 201420185326 U CN201420185326 U CN 201420185326U CN 203813662 U CN203813662 U CN 203813662U
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- signal
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- current detecting
- switching device
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Abstract
The utility model relates to the electronic technology field, and concretely relates to a switch power supply converter. The switch power supply converter comprises a switch element for switching a switch output voltage between an input end voltage and the ground according to a comparator output signal and a clock signal, a current detection branch for generating a current detection signal, a voltage-current converter for generating a current signal according to an error amplification signal and providing the current signal to the current detection branch, and a comparator for carrying out comparison according to the current detection signal and the output voltage of the switch element and generating a comparator output signal. The switch power supply converter is simple in structure, can achieve rapid current detection, and achieves effective control and protection of a switch power supply.
Description
Technical field
The utility model relates to electronic technology field, is specifically related to a kind of switch power converter.
Background technology
The characteristic such as high efficiency, low-power consumption of Switching Power Supply makes it in portable electronic device market, have irreplaceable status; except performance will meet the requirement of powered products; the safeguard measure of power supply self is also extremely important, overcurrent protection be prevent switching power source chip because of overload or output short-circuit cause one of safeguard procedures of accidental damage.And current detection circuit is the key modules of overcurrent protection, detect timely and effectively by the electric current of convection current overpower switching tube, effectively to carry out switch control and overcurrent protection, reach the object of protection chip and peripheral component.
In traditional current detection technology, relatively conventional a kind of electric current detecting method is the precision resistance realization detection that resistance is very little of connecting in circuit, in a kind of circuit topology, by a very little accurate current sense resistor of resistance is connected with main power tube, electric current current flowing detects resistance and produces a pressure drop, amplify this small pressure drop by an operational amplifier again, thereby the electric current of detection power pipe, but this method can be introduced extra power loss, affect the efficiency of system and increase cost.
Another kind of electric current detecting method is mirror image detection method, it is in parallel with main power tube by a sampling transistor is set, the raceway groove effective width of main power tube is the more than 1000 times of sampling transistor, after being connected with the source electrode of sampling transistor, the source electrode of main power tube is connected with input voltage, the grid of main power tube is connected with the grid of sampling transistor, the drain electrode of main power tube and the drain electrode of sampling transistor are connected respectively the input of an operational amplifier, by being set, operational amplifier equates with the drain voltage of main power tube for ensureing sampling transistor, the size of current of sampling transistor is the main power tube size of current after scaled, but, the precision of this detection method depends on the matching performance of current mirror, can cause main power tube M1 conducting to need minimum time the settling time of operational amplifier simultaneously, cause detection speed cross slow and be easy to make mistakes.
Utility model content
The purpose of this utility model is, a kind of switch power converter of realizing fast current detecting is provided, and solves above technical problem.
The technical problem that the utility model solves can realize by the following technical solutions:
Realize the switch power converter of fast current detecting, wherein, comprise,
One switching device unit, in order to switch output voltage according to a comparison signal and a clock signal between an input voltage and ground;
One current detecting branch road, for producing a voltage signal under the driving at a current signal;
One voltage-current converter, produces described current signal according to an error amplification signal, offers described current detecting branch road;
One comparator, compares and produces described comparison signal according to the output voltage of described voltage signal and described switching device unit.
Preferably, also comprise an error amplifier, in order to a voltage feedback signal and a reference voltage are compared, obtain described error amplification signal.
Preferably, the detection power pipe of connecting on described current detecting branch road.
Preferably, described detection power pipe adopts N-channel MOS pipe; The drain electrode of described detection power pipe connects described input voltage, and the source electrode of described detection power pipe connects the output of described voltage-current converter.
Preferably, also comprise an oscillator, selectively export a high-frequency signal or a low-frequency signals according to the comparative result of described voltage feedback signal and one second reference voltage, using described high-frequency signal or described low-frequency signals as described clock signal.
Preferably, described oscillator is also for exporting a slope compensation signal, and described slope compensation signal offers the input of described voltage-current converter after adding up by an accumulator and described error amplification signal.
Preferably, described switching device unit comprises a trigger and a driver element, and an input of described trigger connects described comparison signal; Another input of described trigger connects described clock signal, and described trigger outputs control signals to described driver element.
Preferably, described driver element comprises one first switching device and a second switch device, described the first switching device and described second switch device alternate conduction or cut-off under the effect of described control signal, make described the first switching device conducting and described second switch device when cut-off, described output voltage is input voltage; Described second switch break-over of device and described first switching device when cut-off, described output voltage ground connection.
Preferably, described the first switching device and second switch device all adopt N-channel MOS pipe, and the raceway groove effective width of described the first switching device is M times of described detection power pipe, and wherein the value of M is 1000 to 10000.
Preferably, the grid of described detection power pipe connects a high level or is connected with the control signal of described the first switching device.
Beneficial effect: owing to adopting above technical scheme, the utility model is simple in structure, can realize fast current detecting, realizes the effective control and protection of Switching Power Supply.
Brief description of the drawings
Fig. 1 is circuit diagram of the present utility model.
Embodiment
Below in conjunction with the accompanying drawing in the utility model embodiment, the technical scheme in the utility model embodiment is clearly and completely described, obviously, described embodiment is only the utility model part embodiment, instead of whole embodiment.Based on the embodiment in the utility model, the every other embodiment that those of ordinary skill in the art obtain under the prerequisite of not making creative work, belongs to the scope that the utility model is protected.
It should be noted that, in the situation that not conflicting, the feature in embodiment and embodiment in the utility model can combine mutually.
Below in conjunction with the drawings and specific embodiments, the utility model is described in further detail, but not as restriction of the present utility model.
With reference to Fig. 1, realize the switch power converter of fast current detecting, wherein, comprise,
One switching device unit, in order to switch output voltage according to a comparison signal and a clock signal between an input voltage and ground;
One current detecting branch road, for producing a voltage signal under the driving at a current signal, this voltage signal represents with VL, i.e. L point voltage in Fig. 1;
One voltage-current converter V-i, according to an error amplification signal generation current signal, offers current detecting branch road;
One comparator 7, compares generation comparison signal according to the output voltage of voltage signal and switching device unit.
Input voltage of the present utility model provides by Input voltage terminal IN; Ground provides by earth terminal GND;
As a kind of preferred embodiment of the present utility model, also comprise an error amplifier 6, in order to a voltage feedback signal FB and a reference voltage are compared, obtain error amplification signal.Voltage feedback signal FB of the present utility model can realize by a feedback network, and feedback network can be connected between output voltage and ground, and reference voltage can adopt 0.923V.
As a kind of preferred embodiment of the present utility model, a detection power pipe M1_ssnse connects on current detecting branch road.Detection power pipe M1_ssnse can adopt P channel MOS tube or N-channel MOS pipe, preferably adopts N-channel MOS pipe; The drain electrode of detection power pipe M1_ssnse connects input voltage IN, and the source electrode of detection power pipe M1_ssnse connects the output of voltage-current converter V-i.Because the conducting resistance of N-channel MOS pipe is less, be generally 1/3rd left and right of P channel MOS tube, adopt the chip of N-channel MOS pipe than adopting P channel MOS tube to take less area, to there is less conduction loss.
As a kind of preferred embodiment of the present utility model, also comprise an oscillator 3, selectively export a high-frequency signal or a low-frequency signals according to the comparative result of voltage feedback signal and one second reference voltage, using high-frequency signal or low-frequency signals as clock signal.Can relatively realize by one second comparator 12, the second reference voltage can be chosen as 0.3V.When voltage feedback signal FB is during lower than 0.3V, oscillator 3 works in low frequency output mode, and when voltage feedback signal FB is during higher than 0.3V, oscillator 3 works in high-frequency output mode.
As a kind of preferred embodiment of the present utility model, oscillator 3 is also for exporting a slope compensation signal RAMP, and slope compensation signal RAMP offers the input of voltage-current converter V-i after adding up by an accumulator ∑ and error amplification signal.
As a kind of preferred embodiment of the present utility model, switching device unit comprises a trigger 8 and a driver element, and an input of trigger 8 connects comparison signal; Another input of trigger 8 connects clock signal, and trigger 8 is exported two complementary driver elements that control signal to.Preferably, trigger 8 can adopt rest-set flip-flop, and the R end of rest-set flip-flop connects comparison signal, and the S end of rest-set flip-flop connects clock signal, and rest-set flip-flop provides respectively Q end and Q negative terminal signal to driver element.
As a kind of preferred embodiment of the present utility model, driver element comprises one first switching device M1 and a second switch device M2, the first switching device M1 and second switch device M2 alternate conduction or cut-off under the effect of control signal, make the first switching device M1 conducting and second switch device M2 when cut-off, output voltage is input voltage; The M2 conducting of second switch device and first switching device M1 when cut-off, output voltage ground connection.As shown in Figure 1, SW end is output voltage node.
As a kind of preferred embodiment of the present utility model, driver element also comprises the first driver 9 and the second driver 10, the first driver 9 is between trigger 8 and the control end of the first switching device M1, the second driver 10 is between trigger 8 and the control end of second switch device M2, the first driver 9 connects a high-end voltage end and a low side voltage end, the voltage that high-end voltage end is provided under the effect of control signal to the control end of the first switching device M1 or the voltage of low side voltage end to control end.BOOT in scheming holds as high-end voltage end, holds as low side voltage end using SW in scheming; The second driver 10 can be a buffer.
BOOT holds as Bootstrap end, connects 5V supply voltage by a diode D1, and in practical application, BOOT end is also connected an electric capacity between holding with SW, and 5V supply voltage passes through diode D1 to capacitor charging, so that the high level that drives the first switching device M1 conducting to be provided.
As a kind of preferred embodiment of the present utility model, the first switching device M1 and second switch device M2 all adopt N-channel MOS pipe, and the raceway groove effective width of the first switching device M1 is M times of detection power pipe, and wherein the value of M is 1000 to 10000.
As a kind of preferred embodiment of the present utility model, the grid of detection power pipe M1_ssnse connects a high level or is connected with the control signal of the first switching device M1.As connected BOOT end.
As a kind of preferred embodiment of the present utility model, the utility model also comprises an inner voltage regulator module 4, for inner function module required voltage and/or function voltage are provided, as provides 5V supply voltage of the present utility model.
As a kind of preferred embodiment of the present utility model, the utility model also comprises a shutoff comparator 13, when Enable Pin EN inputs lower than a set point, if set point can be 1.3V, turn-offs main modular.
As a kind of preferred embodiment of the present utility model, the utility model also comprises soft starting circuit 5, the output of soft starting circuit 5 connects error amplifier 6, for in the time that the input of circuit powers on, make the slow lifting of output of error amplifier, allow system progress into stable operating state, can control the output voltage rate of climb, reduce to input impulse current, adjust sequential.Once system starts, soft starting circuit will no longer be had an effect.
As a kind of preferred embodiment of the present utility model, the utility model also comprises a compensating network, is connected between the output of error amplifier and the input of comparator, and compensating network adopts the compensating network of R1, C1, C2 composition.R1, C1, C2 select suitable size to guarantee the stability of circuit operation, do not repeat them here.
As a kind of preferred embodiment of the present utility model, also comprise an overvoltage comparator 11, compare according to voltage feedback signal FB and one the 3rd reference voltage, produce an overvoltage protection signal OVP.The 3rd reference voltage can be 1.1V.
As a kind of preferred embodiment of the present utility model; also comprise a protective circuit unit; as passed through gate unit; be or door 14 herein; in the time that voltage feedback signal FB is greater than the 3rd reference voltage or input voltage be less than 3.75 or Enable Pin EN be that at least one condition in a low level signal is while meeting; make switching tube M4 conducting, realize voltage turn-off function, to protect whole circuit.
The utility model is compared, amplifies the difference between reference voltage and feedback voltage FB by error amplifier 1, obtains error amplification signal; Error amplification signal and slope compensation signal carry out after slope compensation, be converted to current signal via voltage-current converter V-i and offer detection power pipe M1_ssnse, detection power pipe M1_ssnse produces a voltage signal VL under the driving of current signal, comparator 7 compares the voltage of voltage signal VL and switching node SW, make voltage signal VL follow the voltage of switching node SW, meanwhile, the action that current signal also helps current detecting branch road and enters fast next cycle.
Under the utility model initial conditions, voltage signal VL is less than switching node SW voltage, comparator 7 is output as low level, under a rising edge clock signal effect, the output Q end output high level signal of rest-set flip-flop, the first switching device M1 conducting, the first switching device M1 electric current continues to increase, when voltage signal VL is greater than the voltage signal of switching node SW, comparator 7 upsets produce low level, the output Q end output low level signal of rest-set flip-flop, the first switching device M1 turn-offs, second switch device M2 conducting, go round and begin again and realize circulation, when the moment that comparator 7 overturns, voltage signal VL equates with the voltage signal of switching node SW, current detecting and circuit control are realized.
The foregoing is only the utility model preferred embodiment; not thereby limit execution mode of the present utility model and protection range; to those skilled in the art; the scheme that being equal to of should recognizing that all utilization the utility model specifications and diagramatic content done replaces and apparent variation obtains, all should be included in protection range of the present utility model.
Claims (10)
1. the switch power converter of realizing fast current detecting, is characterized in that, comprises,
One switching device unit, in order to switch output voltage according to a comparison signal and a clock signal between an input voltage and ground;
One current detecting branch road, for producing a voltage signal under the driving at a current signal;
One voltage-current converter, produces described current signal according to an error amplification signal, offers described current detecting branch road;
One comparator, compares and produces described comparison signal according to the output voltage of described voltage signal and described switching device unit.
2. the switch power converter of realizing fast current detecting according to claim 1, is characterized in that, also comprises an error amplifier, in order to a voltage feedback signal and a reference voltage are compared, obtains described error amplification signal.
3. the switch power converter of realizing fast current detecting according to claim 1, is characterized in that, the detection power pipe of connecting on described current detecting branch road.
4. the switch power converter of realizing fast current detecting according to claim 3, is characterized in that, described detection power pipe adopts N-channel MOS pipe; The drain electrode of described detection power pipe connects described input voltage, and the source electrode of described detection power pipe connects the output of described voltage-current converter.
5. the switch power converter of realizing fast current detecting according to claim 2, it is characterized in that, also comprise an oscillator, comparative result according to described voltage feedback signal and one second reference voltage is selectively exported a high-frequency signal or a low-frequency signals, using described high-frequency signal or described low-frequency signals as described clock signal.
6. the switch power converter of realizing fast current detecting according to claim 5, it is characterized in that, described oscillator is also for exporting a slope compensation signal, and described slope compensation signal offers the input of described voltage-current converter after adding up by an accumulator and described error amplification signal.
7. the switch power converter of realizing fast current detecting according to claim 3, is characterized in that, described switching device unit comprises a trigger and a driver element, and an input of described trigger connects described comparison signal; Another input of described trigger connects described clock signal, and described trigger outputs control signals to described driver element.
8. the switch power converter of realizing fast current detecting according to claim 7, it is characterized in that, described driver element comprises one first switching device and a second switch device, described the first switching device and described second switch device alternate conduction or cut-off under the effect of described control signal, make described the first switching device conducting and described second switch device when cut-off, described output voltage is input voltage; Described second switch break-over of device and described first switching device when cut-off, described output voltage ground connection.
9. the switch power converter of realizing fast current detecting according to claim 8, it is characterized in that, described the first switching device and second switch device all adopt N-channel MOS pipe, the raceway groove effective width of described the first switching device is M times of described detection power pipe, and wherein the value of M is 1000 to 10000.
10. the switch power converter of realizing fast current detecting according to claim 8, is characterized in that, the grid of described detection power pipe connects a high level or is connected with the control signal of described the first switching device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420185326.1U CN203813662U (en) | 2014-04-16 | 2014-04-16 | Switch power supply converter achieving rapid current detection |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420185326.1U CN203813662U (en) | 2014-04-16 | 2014-04-16 | Switch power supply converter achieving rapid current detection |
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| Publication Number | Publication Date |
|---|---|
| CN203813662U true CN203813662U (en) | 2014-09-03 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
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| CN201420185326.1U Withdrawn - After Issue CN203813662U (en) | 2014-04-16 | 2014-04-16 | Switch power supply converter achieving rapid current detection |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105099182A (en) * | 2014-04-16 | 2015-11-25 | 钰太芯微电子科技（上海）有限公司 | Switching power supply converter capable of realizing rapid current detection |
-
2014
- 2014-04-16 CN CN201420185326.1U patent/CN203813662U/en not_active Withdrawn - After Issue
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105099182A (en) * | 2014-04-16 | 2015-11-25 | 钰太芯微电子科技（上海）有限公司 | Switching power supply converter capable of realizing rapid current detection |
| CN105099182B (en) * | 2014-04-16 | 2017-11-07 | 钰太芯微电子科技（上海）有限公司 | Realize the switch power converter of fast current detecting |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C53 | Correction of patent for invention or patent application | ||
| CB03 | Change of inventor or designer information |
Inventor after: Ye Jinghua Inventor after: Chen Jia Inventor before: Ye Jinghua |
|
| COR | Change of bibliographic data |
Free format text: CORRECT: INVENTOR; FROM: YE JINGHUA TO: YE JINGHUA CHEN JIA |
|
| AV01 | Patent right actively abandoned | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20140903 Effective date of abandoning: 20171107 |