CN2744056Y - Switch power controller - Google Patents
Switch power controller Download PDFInfo
- Publication number
- CN2744056Y CN2744056Y CN 200420061767 CN200420061767U CN2744056Y CN 2744056 Y CN2744056 Y CN 2744056Y CN 200420061767 CN200420061767 CN 200420061767 CN 200420061767 U CN200420061767 U CN 200420061767U CN 2744056 Y CN2744056 Y CN 2744056Y
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- power supply
- switching
- switching power
- voltage
- current
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Abstract
The utility model discloses a switch power controller. A voltage detecting circuit arranged on the output end of the switch power controller is connected with a current detection circuit arranged in the switch power supply at the input end of a comparator by superposition, and thus the current detect signal of the switch power supply is superimposed in the voltage detecting signal. The switch power controller has the advantages of high controlled dynamic response speed, strong anti-interference capability, convenient power connection in parallel, and stable output voltage, and the switch power controller can automatically realize over current protection of the circuit.
Description
Affiliated technical field
The utility model relates to a kind of control device of Switching Power Supply.
Background technology
Along with developing rapidly of power electronic technology, the relation of power electronic equipment and people's work, life is close day by day, and electronic equipment all be unable to do without reliable power supply.The Switching Power Supplyization that entered the computer power supply round Realization eighties, take the lead in finishing the power supply replacement of computer, enter nineties Switching Power Supply and enter various electronics, electric equipment field in succession, stored-program control exchange, communication, electron detection device power supply, control appliance power supply etc. have all used Switching Power Supply widely, have more promoted developing rapidly of switch power technology.Mainly comprise converter and control device two parts in the formation of Switching Power Supply.Converter is called power circuit again, has mainly comprised the switching device of on-off action, and its control power supply provides the time of energy to load; The device for transformer storage power, when switch conduction, the energy that is stored in the device for transformer discharges to load, makes load obtain continuous and stable energy; Current rectifying and wave filtering circuit makes the output of load stable.The converter of prior art has Buck converter (buck converter), Boost converter (booster converter), forward converter, anti exciting converter etc. multiple.Another major part of Switching Power Supply is a control device, it can detect the variation of power input voltage and/or load generation, and produce the control output signal according to this and remove the control switch device, change its frequency or pulsewidth and and then control export to the electric weight of load, realize that output is stable.Control device is a key of determining the Switching Power Supply performance, and the best control device of dynamic reflection characteristic is at present:
Two Voltage Feedback control device also are V
2Control device.This control device compares the acquisition error signal with error amplifier to the output voltage and a reference voltage of Switching Power Supply; Pressure drop on the equivalent series resistance of output filter capacitor compares the acquisition control signal as the voltage detection signal of output to error signal and inductance ripple with comparator.The feedback that output voltage forms constitutes the external feedback ring, and the feedback of output end voltage detection signal constitutes the internal feedback ring.Its shortcoming is: the ripple that utilizes output voltage is the voltage detection signal of device as a comparison, and the ripple of output voltage is very little usually, so the anti-interference of this control device is poor; When control pulsewidth duty ratio big.At 50% o'clock, can produce subharmonic oscillation, the bad stability of power supply improves stability though can introduce the method for slope compensation, but can obviously reduce the transient response of control; And input, output current all not have directly control, power supply is directly in parallel when using, and can not carry out current-sharing, may cause the overcurrent of power supply to damage, and is not easy to power supply use in parallel.When really needing parallel connection, must adopt additional circuit to carry out overcurrent protection.And not at the power circuit of output, in the ripple of output voltage, do not have the rising edge part of inductive current ripple, so V for Boost converter inductance such as (booster converters)
2Control can not realize.
Summary of the invention
The purpose of this utility model provides a kind of control device of Switching Power Supply, the rapid dynamic response speed of this kind control device, and antijamming capability is strong, and is applied widely, and can realize the overcurrent protection of circuit automatically, is convenient to power supply use in parallel, output voltage stabilization.
The utility model solves its technical problem, and the technical scheme that is adopted is: a kind of control device of Switching Power Supply comprises with error amplifier the output voltage and a reference voltage of Switching Power Supply compared the acquisition error signal; By comparator this error signal and the detected voltage detection signal of output end voltage testing circuit are compared the acquisition control signal again, pulsewidth with control switching produces circuit generation pulse width signal, and and then the switching of control switch device, its design feature is: the current detection circuit in output end voltage testing circuit and the Switching Power Supply is at the input of the comparator superposition that links to each other, thus in voltage detection signal the current detection signal in the Switching Power Supply on the superposition.
Current detection circuit in the above-mentioned Switching Power Supply be the testing circuit of switching current of the testing circuit of load current or switching device or device for transformer electric current testing circuit.
Compared with prior art, the beneficial effects of the utility model are: 1, the internal feedback ring adopts the voltage detection signal of output voltage and is taken from the superposition of the current detection signal in the Switching Power Supply, in the internal feedback ring, introduced current feedback, therefore it has quicker response than prior art, the better resisting interference ability; 2, the Boost converter (booster converter) that does not have inductive current ripple rising edge part in the ripple for output voltage, the rising edge signal of inductive current owing to superposeed, so still can control to it, make that the utility model applicability is wider, can be used for the Switching Power Supply that various converters constitute.And introduce the current detecting feedback signal, circuit can be realized overcurrent protection automatically, and the parallel connection of being convenient to Switching Power Supply is used.
Time-domain-simulation is the result also prove: the utility model is lower than the output impedance of prior art, and load current disturbances is had stronger inhibition ability; During low frequency, device of the present utility model " input-output " ratio of gains prior art is low, and the gain during high frequency is similar to prior art, and therefore the fluctuation to input voltage has the ability that suppresses preferably.
Description of drawings
The utility model is described in further detail below in conjunction with drawings and Examples.
Fig. 1 is the structured flowchart of device of the present utility model.
Fig. 2 is the circuit diagram of the utility model embodiment one.
Fig. 3 is the utility model embodiment and V
2The time-domain-simulation oscillogram of the Switching Power Supply of control.
Fig. 4 is the circuit diagram of the utility model embodiment two.
Fig. 5 is the circuit diagram of the utility model embodiment three.
Among Fig. 3: (a) be the time dependent waveform of output current; (b) be the time dependent waveform of output voltage of the utility model embodiment; (c) be V
2The time dependent waveform of the output voltage of control device.
Embodiment
Embodiment one
Fig. 1, Fig. 2 illustrate, and a kind of embodiment of the present utility model is: a kind of control device of Switching Power Supply comprises an output voltage and the reference voltage V to Switching Power Supply with error amplifier C1
RefCompare and obtain error signal V
eAgain by 2 pairs of these error signals of comparator C V
eCompare the acquisition control signal with the detected voltage detection signal of output end voltage testing circuit, with the pulsewidth generation circuit DA generation pulse width signal V of control switching
p, and and then the switching of control switch device S.Current detection circuit in output end voltage testing circuit and the Switching Power Supply is at the input of comparator C 2 superposition that links to each other, thus in voltage detection signal the current detection signal in the superposition Switching Power Supply.
In this example: it is latch that pulsewidth produces circuit DA.The concrete composition of output end voltage testing circuit is: divider resistance R1, R2 are connected to two outputs of Switching Power Supply; One of voltage detecting resistance R 3 is terminated at the connecting place of two divider resistance R1, R2, and the other end links to each other with the input of comparator C 2.Current detection circuit in the Switching Power Supply is: one of current sense resistor Rs is terminated at the negative input signal polar end, and the other end and output voltage negative polarity end join, simultaneously should end also with the output end voltage testing circuit at the input of comparator C 2 superposition that links to each other.Voltage on the resistance R s is directly proportional with the electric current of switching device S.
The concrete course of work and the principle of the device of this example are: clock signal CP resets latch DA and exports high level, also switching tube S conducting of switching device S, the input signal V of input circuit when each cycle begins
iSwitching tube S through conducting sends into device for transformer L, the current i of device for transformer L
LIncrease by initial value is linear,, be somebody's turn to do the inductance ripple current Δ i that changes because the impedance of filter capacitor C branch road is far smaller than the impedance of load R under switching frequency
LThe filter capacitor C that flows through fully is by the polyphone dead resistance R of filter capacitor C
EGive filter capacitor C charging, thereby at R
EThe last generation pressure drop Δ i identical with the inductive current slope
LR
E, because the capacity of filter capacitor C is very big, its voltage V
CapCan think invariable, then output voltage V can be written as:
V＝Δi
LR
E+V
cap (1)
The detection voltage of interior ring is:
V
s＝K
VV+R
SΔi
L (2)
Wherein
Dividing potential drop ratio for output voltage.
(1) substitution (2) can obtain:
V
s＝(K
VR
E+R
S)Δi
L+K
VV
cap (3)
Work as V
sWhen increasing to error voltage Ve, comparator C 2 upsets, thus making latch DA output low level, switching device S turn-offs.The inductive current of device for transformer L is linear to descend, and arrives up to next clock pulse signal, begins a new cycle.
By (3) formula as can be known: utilize control device of the present utility model, increased the internal feedback ring after the introducing current detecting, promptly improved the gain of whole feedback loop, thereby made circuit have quicker response to load variations to the gain that output voltage changes.
The simulation analysis result:
Fig. 3 is for using Pspice software respectively to control device of the present utility model and V
2The type control device carries out the time-domain-simulation analysis result.Each component (a) and (b) of Fig. 3, (c) transverse axis are the time (ms), and the longitudinal axis (a) is a load current, and the longitudinal axis (b) is respectively the output voltage of the utility model correspondence, and the longitudinal axis (c) is V
2The output voltage of control device correspondence.Illustrate, during 8.0ms, load changes to 20A by the 10A step, and the utility model response speed is obviously accelerated, and the response time has only 0.15ms, and does not have overshoot; V
2Control needs 0.20ms, and the overshoot of 35mV is arranged.As seen the utlity model has better load dynamic characteristic.
The frequency-domain analysis simulation result shows that also the utility model is lower than the output impedance of prior art, and load current disturbances is had stronger inhibition ability; During low frequency, the utility model " input-output " ratio of gains prior art is low, and the gain during high frequency is similar to prior art, and therefore the fluctuation of input voltage of the present utility model has the ability that suppresses preferably.
In this example, switching device S connects with device for transformer L, so when the switch S conducting, the electric current of switching device S is exactly the electric current of device for transformer L.
Embodiment two
Fig. 4 illustrates, and this example is compared with embodiment one, and just converter has partly made forward converter into, and control device is identical with embodiment one.Can prove that equally it can realize the purpose of this utility model by simulation result.
Embodiment three
Fig. 5 illustrates, this example is compared with embodiment one, different is: the converter of Switching Power Supply is Boost converter (a boosting inverter converter), current detection signal is taken from the switching current of switching device in the Switching Power Supply, current detection circuit in the Switching Power Supply is the testing circuit of the switching current of switching device S then, and it constitutes: one of current sense resistor Rs is terminated at the negative input signal polar end; The earth terminal of the other end and switching device (actual for switching tube) S joins, simultaneously should end also with the output end voltage testing circuit at the input of comparator C 2 superposition that links to each other.Voltage on the resistance R s is directly proportional with the electric current of switching device S.Remaining structure, composition are identical with embodiment one.
Current detection signal of the present utility model both can adopt the current detection circuit of the foregoing description, certainly also can adopt the current detection circuit of other existing structure, as long as can switching device or device for transformer from Switching Power Supply detect the taking-up current signal.The dotted line of two band arrows among Fig. 1 promptly is that the expression current detection signal can come from switching device in the Switching Power Supply, the position, a place in device for transformer two places rather than simultaneously from position, two places.
The Switching Power Supply of device of the present utility model three kinds of converter compositions in can be used for the foregoing description, also can directly or make the simple Switching Power Supply that is used for Buck-boost (buck-boost converter), Cuk converter, anti exciting converter, half-bridge converter, full-bridge converter constant power circuit composition that changes.
Pulsewidth of the present utility model produces circuit and also can be made of other circuit such as timers.For example make " deciding service time " control circuit of pulsewidth circuit with timer, by the opening time of the output control timer that feeds back the comparator of determining, the output of timer is turn-offed switching device, and timer picks up counting; Through after the timing, timer output upset once more, the control switch device is opened again.
Certainly, device of the present utility model also can be in the voltage detection signal of internal feedback ring superposition upslope compensating signal again, adopt the method for slope compensation to improve the stability of Switching Power Supply, make the stability of Switching Power Supply and dynamic response characteristic reach good coupling.
Claims (2)
1, a kind of control device of Switching Power Supply comprises with error amplifier the output voltage and a reference voltage of Switching Power Supply compared the acquisition error signal; By comparator this error signal and the detected voltage detection signal of output end voltage testing circuit are compared the acquisition control signal again, pulsewidth with control switching produces circuit generation pulse width signal, and and then the switching of control switch device, it is characterized in that: the current detection circuit in described output end voltage testing circuit and the Switching Power Supply is at the input of the comparator superposition that links to each other, thus in voltage detection signal the current detection signal in the Switching Power Supply on the superposition.
2, the control device of Switching Power Supply according to claim 1 is characterized in that: the current detection circuit in the described Switching Power Supply is the testing circuit of switching current of switching device or the testing circuit of device for transformer electric current.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200420061767 CN2744056Y (en) | 2004-10-25 | 2004-10-25 | Switch power controller |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200420061767 CN2744056Y (en) | 2004-10-25 | 2004-10-25 | Switch power controller |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2744056Y true CN2744056Y (en) | 2005-11-30 |
Family
ID=35634072
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200420061767 Expired - Fee Related CN2744056Y (en) | 2004-10-25 | 2004-10-25 | Switch power controller |
Country Status (1)
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|---|---|
| CN (1) | CN2744056Y (en) |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101093936B (en) * | 2006-06-19 | 2010-09-29 | 上海乐金广电电子有限公司 | Device for cutting off voltage of abnormal power supply |
| CN101546958B (en) * | 2009-04-30 | 2010-12-29 | 西南交通大学 | Improved technique for pulse-width modulation of switching power supply and device for achieving same |
| CN101405671B (en) * | 2006-03-17 | 2011-04-20 | Nxp股份有限公司 | Supply circuit with ripple compensation |
| CN102255509A (en) * | 2011-06-17 | 2011-11-23 | 苏州万松电气有限公司 | Power supply for train firefighting system |
| CN102332697A (en) * | 2010-05-26 | 2012-01-25 | 通用电气航空系统有限公司 | Measuring transient electrical activity in aircraft power distribution systems |
| CN103036439A (en) * | 2012-12-14 | 2013-04-10 | 山西科达自控工程技术有限公司 | Direct current wide-range input power supply |
| CN104079167A (en) * | 2014-07-07 | 2014-10-01 | 矽力杰半导体技术(杭州)有限公司 | Control circuit, switching power supply and control method |
| CN104158398A (en) * | 2014-08-12 | 2014-11-19 | 常州大学 | V<2>-PT modulation method of switch power supply, and V<2>-PT modulation device of switch power supply |
| CN108336905A (en) * | 2017-11-16 | 2018-07-27 | 上海芯导电子科技有限公司 | A kind of DC-DC circuit |
-
2004
- 2004-10-25 CN CN 200420061767 patent/CN2744056Y/en not_active Expired - Fee Related
Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101405671B (en) * | 2006-03-17 | 2011-04-20 | Nxp股份有限公司 | Supply circuit with ripple compensation |
| CN101093936B (en) * | 2006-06-19 | 2010-09-29 | 上海乐金广电电子有限公司 | Device for cutting off voltage of abnormal power supply |
| CN101546958B (en) * | 2009-04-30 | 2010-12-29 | 西南交通大学 | Improved technique for pulse-width modulation of switching power supply and device for achieving same |
| CN102332697B (en) * | 2010-05-26 | 2016-01-13 | 通用电气航空系统有限公司 | The transient electrical measured in aircraft power distribution is movable |
| CN102332697A (en) * | 2010-05-26 | 2012-01-25 | 通用电气航空系统有限公司 | Measuring transient electrical activity in aircraft power distribution systems |
| CN102255509A (en) * | 2011-06-17 | 2011-11-23 | 苏州万松电气有限公司 | Power supply for train firefighting system |
| CN103036439B (en) * | 2012-12-14 | 2015-03-25 | 山西科达自控股份有限公司 | Direct current wide-range input power supply |
| CN103036439A (en) * | 2012-12-14 | 2013-04-10 | 山西科达自控工程技术有限公司 | Direct current wide-range input power supply |
| CN104079167A (en) * | 2014-07-07 | 2014-10-01 | 矽力杰半导体技术(杭州)有限公司 | Control circuit, switching power supply and control method |
| US9548658B2 (en) | 2014-07-07 | 2017-01-17 | Silergy Semiconductor Technology (Hangzhou) Ltd | Control circuit, switching power supply and control method |
| CN104158398A (en) * | 2014-08-12 | 2014-11-19 | 常州大学 | V<2>-PT modulation method of switch power supply, and V<2>-PT modulation device of switch power supply |
| CN108336905A (en) * | 2017-11-16 | 2018-07-27 | 上海芯导电子科技有限公司 | A kind of DC-DC circuit |
| CN108336905B (en) * | 2017-11-16 | 2020-12-04 | 上海芯导电子科技有限公司 | DC-DC circuit |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |