CN103904897B - Switching power source control circuit, Switching Power Supply, leading edge detection circuit and method - Google Patents
Switching power source control circuit, Switching Power Supply, leading edge detection circuit and method Download PDFInfo
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Abstract
Disclose a kind of switching power source control circuit, Switching Power Supply, leading edge detection circuit and method.Described switching power source control circuit includes that zero passage detection signal input part, scaling signal obtain circuit, zero cross detection circuit and leading edge detection circuit；Scaling signal obtains circuit and zero passage detection signal input part connects, for output the first scaling signal and the second scaling signal.Leading edge detection circuit obtains busbar voltage sampled signal and the busbar voltage sampled signal of current switch period of previous switch periods according to switch controlling signal and the first scaling signal, and when the busbar voltage sampled signal of current switch period exceedes predetermined threshold with the difference of the busbar voltage sampled signal of previous switch periods, export leading edge detection signal.The present invention can reduce the component number of the switching power circuit with controllable silicon regulator, improves circuit level.
Description
Technical field
The present invention relates to Power Electronic Technique, be specifically related to a kind of switching power source control circuit, switch
Power supply, leading edge detection circuit and method.
Background technology
The light-dimming method that thyristor regulating is the most conventional, controllable silicon regulator uses phase controlling
Method realizes light modulation, i.e. controls controllable silicon regulator conducting at every sine wave half cycle, it is thus achieved that
Identical conduction phase angle.By regulating the chopped phase of controllable silicon regulator, thus it is possible to vary conducting phase
Angle size, it is achieved light modulation.
Fig. 1 is the circuit diagram of the existing Switching Power Supply with controllable silicon regulator.Switch electricity
Busbar voltage is sampled to detect the forward position of conduction phase angle by source 10, and it includes alternating current input
vin, controllable silicon regulator 11, rectifier bridge 12, bus sample circuit 13, DC-DC converter
14 and switching power source control circuit 15.Its median generatrix sample circuit 13 for be connected to voltage bus and
Bleeder circuit between earth terminal, its busbar voltage that sampling is obtained be input to isolated DC-
In DC converter switching power source control circuit 15.Due to switching power source control circuit 15 usually
Integrated circuit, accordingly, it would be desirable to arrange special busbar voltage input pin.
Existing Switching Power Supply needs special bus sample circuit and is that inlet highway voltage exists
Arranging pin in switching power source control circuit specially, this makes component quantity more, integrated level
Low, and packaging cost is higher.
Summary of the invention
In view of this, it is provided that a kind of switching power source control circuit, Switching Power Supply, leading edge detection circuit
And method, controllable silicon regulation can be detected according to the signal proportional to energy storage inductor both end voltage
The forward position of device conduction phase angle, to reduce circuit components quantity, improves integrated level.
In first aspect, it is provided that a kind of switching power source control circuit, include thyristor regulating for control
Joint device and the Switching Power Supply of DC-DC converter isolated DC-DC converter, described switch
Power control circuit includes that zero passage detection signal input part, scaling signal obtain circuit, zero passage detection
Circuit and leading edge detection circuit；
Described scaling signal obtains circuit and described zero passage detection signal input part connects, and is used for exporting
First scaling signal and the second scaling signal, described first scaling signal becomes with isolated DC-direct current
The energy storage inductor both end voltage of parallel operation DC-DC converter becomes the first ratio, described second ratio letter
Number become the second ratio with described auxiliary winding both end voltage；
Before described leading edge detection circuit obtains according to switch controlling signal and described first scaling signal
The busbar voltage sampled signal of one switch periods and the busbar voltage sampled signal of current switch period,
And the busbar voltage of busbar voltage sampled signal and the previous switch periods at described current switch period
When the difference of sampled signal exceedes predetermined threshold, export leading edge detection signal；Wherein, described forward position
The forward position of detection signal designation controllable silicon regulator conduction phase angle；Described busbar voltage sampled signal table
Levy described first scaling signal value during switch controlling signal is conducting state；
Described zero cross detection circuit carries out current over-zero detection according to described second scaling signal.
Preferably, described leading edge detection circuit includes voltage register circuit and threshold value comparison circuit:
Described voltage register circuit obtains according to switch controlling signal and the first scaling signal and deposits
The busbar voltage sampled signal of previous switch periods and the busbar voltage sampled signal of current switch period；
Described threshold value comparison circuit in the busbar voltage sampled signal of described current switch period with front
When the difference of the busbar voltage sampled signal of one switch periods exceedes predetermined threshold, export leading edge detection
Signal.
Preferably, described voltage register circuit includes signal input part, the first outfan, second defeated
Go out end, the first switch, second switch, the first electric capacity and the second electric capacity；
Described first switch is connected between signal input part and the first outfan, according to on-off control
Signal conduction and shutoff；
Described second switch is connected between the first outfan and the second outfan, according to on-off control
The inversion signal turn-on and turn-off of signal；
Described first electric capacity is connected between the first output and ground；
Described second electric capacity is connected between the second output and ground；
The busbar voltage sampled signal of described first outfan output current switch period；
Described second outfan exports the busbar voltage sampled signal of previous switch periods.
Preferably, described threshold value comparison circuit includes voltage source and comparator；
The first input end of described comparator inputs the busbar voltage sampling of described current switch period
Signal；
Described voltage source be connected to the busbar voltage sampled signal of previous switch periods input and
Between second input of described comparator.
Preferably, described scaling signal acquisition circuit includes controlled current source, current mirror and conversion electricity
Resistance；
Described current mirror has reference current end, the first mirror image end and the second mirror image end；
Described controlled current source is connected between described reference current end and earth terminal, generates with described
The current signal that energy storage inductor both end voltage is proportional；
Described transfer resistance is connected between described first mirror image end and earth terminal；
Described first mirror image end exports described first scaling signal；
Described second mirror image end exports described second scaling signal.
Preferably, controlled current source includes operational amplifier, the first transistor；
The first input end of described operational amplifier and earth terminal connection, the second input and described mistake
The grid of zero detection signal input part connection, outfan and described the first transistor connects；
Described the first transistor is connected to the reference current end of described current mirror and described zero passage detection
Between signal input part.
Preferably, described DC-DC converter is isolated DC-DC converter or non-isolated
Formula DC-DC converter.
Preferably, described scaling signal obtains circuit according to the auxiliary winding coupled with energy storage inductor
Both end voltage generates described first scaling signal and the second scaling signal.
Preferably, described switching power source control circuit also includes that conduction phase angle obtains circuit, for root
Conduction phase angle indication signal is generated according to described leading edge detection signal and power supply good signal (POK).
Second aspect, it is provided that a kind of Switching Power Supply, including controllable silicon regulator, rectifier bridge and direct current
-DC converter and switching power source control circuit as above.
The third aspect, it is provided that a kind of leading edge detection circuit, is used for detecting controllable silicon regulator conducting phase
The forward position at angle, described leading edge detection circuit includes:
Voltage register circuit, obtains previous switch week according to switch controlling signal and the first scaling signal
The busbar voltage sampled signal of phase and the busbar voltage sampled signal of current switch period, described bus
Voltage sampling signal characterizes described first scaling signal during switch controlling signal is conducting state
Value, described first scaling signal becomes the first ratio with DC-to-DC converter energy storage inductor voltage；
Threshold value comparison circuit, the busbar voltage sampled signal at described current switch period is opened with previous
When the difference of the busbar voltage sampled signal in pass cycle exceedes predetermined threshold, export leading edge detection signal.
Preferably, described voltage register circuit includes signal input part, the first outfan, second defeated
Go out end, the first switch, second switch, the first electric capacity and the second electric capacity；
Described first switch is connected between signal input part and the first outfan, according to on-off control
Signal conduction and shutoff；
Described second switch is connected between the first outfan and the second outfan, according to on-off control
The inversion signal turn-on and turn-off of signal；
Described first electric capacity is connected between the first output and ground；
Described second electric capacity is connected between the second output and ground；
The busbar voltage sampled signal of described first outfan output current switch period；
Described second outfan exports the busbar voltage sampled signal of previous switch periods.
Preferably, described threshold value comparison circuit includes voltage source and comparator；
The first input end of described comparator inputs the busbar voltage sampling of described current switch period
Signal；
Described voltage source be connected to the busbar voltage sampled signal of previous switch periods input and
Between second input of described comparator.
Preferably, described leading edge detection circuit also includes that the first scaling signal obtains circuit, is used for obtaining
Take described first scaling signal.
Fourth aspect, it is provided that a kind of frontier inspection, is used for detecting controllable silicon regulator conducting phase
The forward position at angle, described method includes:
Obtain the first scaling signal, described first scaling signal and DC-to-DC converter energy storage electricity
Sense both end voltage becomes the first ratio；
The bus of previous switch periods is obtained according to switch controlling signal and described first scaling signal
The busbar voltage sampled signal of voltage sampling signal and current switch period, described busbar voltage is sampled
First scaling signal value during switch controlling signal is conducting state described in characterization；
Busbar voltage sampled signal and the bus of previous switch periods at described current switch period
When the difference of voltage sampling signal exceedes predetermined threshold, export leading edge detection signal.
The present invention detects controllable silicon regulation according to the signal proportional to energy storage inductor both end voltage
The forward position of device conduction phase angle, it is possible to reduce there is first device of the switching power circuit of controllable silicon regulator
Number of packages amount, improves circuit level.
Accompanying drawing explanation
By description to the embodiment of the present invention referring to the drawings, the present invention above-mentioned and other
Objects, features and advantages will be apparent from, in the accompanying drawings:
Fig. 1 is the circuit diagram of the existing Switching Power Supply with controllable silicon regulator；
Fig. 2 A is the circuit diagram of the Switching Power Supply of first embodiment of the invention；
Fig. 2 B is the working waveform figure of isolated DC-DC converter；
Fig. 2 C is the working waveform figure of the Switching Power Supply of first embodiment of the invention；
Fig. 3 A is the circuit diagram of the switching power source control circuit of first embodiment of the invention；
Fig. 3 B is the working waveform figure that in first embodiment of the invention, conduction phase angle obtains circuit；
Fig. 4 is the circuit diagram of the switching power source control circuit of second embodiment of the invention；
Fig. 5 is the circuit diagram that the preferred scaling signal of second embodiment of the invention one obtains circuit；
Fig. 6 A is the circuit diagram of the Switching Power Supply of third embodiment of the invention；
Fig. 6 B is the working waveform figure of non-isolated DC-DC converter；
Fig. 6 C is the circuit diagram of the switching power source control circuit of third embodiment of the invention；
Fig. 7 is the flow chart of the frontier inspection of third embodiment of the invention.
Detailed description of the invention
Below based on embodiment, present invention is described, but the present invention is not restricted to these
Embodiment.In below the details of the present invention being described, detailed describe some specific detail portion
Point.The description not having these detail sections for a person skilled in the art can also understand this completely
Invention.In order to avoid obscuring the essence of the present invention, known method, process, flow process, element and
Circuit narration the most in detail.
Additionally, it should be understood by one skilled in the art that accompanying drawing is provided to provided herein
Bright purpose, and accompanying drawing is not necessarily drawn to scale.
It will also be appreciated that in the following description, " circuit " refer to by least one element or
The galvanic circle that electronic circuit is connected and composed by electrical connection or electromagnetism.When claiming element or circuit " even
Receive " another element or claim element/circuit when " being connected to " between two nodes, it can be straight
Connecing and couple or be connected to another element or can there is intermediary element, the connection between element is permissible
Be physically, in logic or its combine.On the contrary, when claiming element " to be directly coupled to "
Or during " being directly connected to " another element, it is meant that there is not intermediary element in both.
Unless the context clearly requires otherwise, otherwise " the including " in entire disclosure and claims,
Implication rather than the exclusive or exhaustive implication that similar word should be construed to comprise such as " comprise "；
It is to say, be the implication of " including but not limited to ".
In the following description (unless otherwise indicated), " known ", " fixing ", " giving " and " making a reservation for "
Under normal circumstances, a value, quantity, parameter, constraints, condition, state, stream are referred to
Journey, process, method, enforcement, or various combination etc. be variable in theory, but if carry
Front setting, then be to maintain constant in follow-up use.
In describing the invention, it is to be understood that term " first ", " second " etc. are only used
In describing purpose, and it is not intended that indicate or hint relative importance.Additionally, the present invention's
In description, except as otherwise noted, " multiple " are meant that two or more.
In the following description, with flyback isolated DC-DC converter and step-down type dc-straight
Illustrate as a example by current converter, but, it should be readily apparent to one skilled in the art that the present invention is permissible
It is applied to the other type of Switching Power Supply comprising DC-DC converter.
Fig. 2 A is the circuit diagram of the Switching Power Supply of first embodiment of the invention.As shown in Figure 2 A,
Switching Power Supply 20 includes alternating current input vin, controllable silicon regulator 21, rectifier bridge 22, isolation
Formula DC-DC converter 23, switching power source control circuit 24 and voltage sampling circuit 25.
Alternating current input vinInput AC electricity.
Controllable silicon regulator 21 for carrying out forward position copped wave, output tool to the ac signal of input
There is the exchange forward position chopping signal of adjustable conduction phase angle.
Rectifier bridge 22 exchange forward position chopping signal is converted to direct current forward position chopping signal export every
From formula DC-DC converter 23.
Direct current forward position chopping signal is converted by isolated DC-DC converter 23, output with
The average anode current that the conduction phase angle of direct current forward position chopping signal is corresponding, drives loaded work piece.
Wherein, isolated DC-DC converter 23 includes transformator T, power switch S, whole
Stream diode D1, output capacitance CO, current sampling resistor RSEN.Transformator T includes primary side winding
L1, vice-side winding L2.First end of primary side winding L1 is connected to bus, receives rectifier bridge output
Direct current forward position chopping signal.Power switch S and current sampling resistor RSENIt is connected in series in former limit
Between second end and the earth terminal of winding L1.By commutation diode D1 and output capacitance COComposition
Secondary current rectifying and wave filtering circuit is connected with vice-side winding L2, exports after secondary winding current rectifying and wave-filtering
To load.
Voltage sampling circuit 25, for the voltage at primary side winding L1 two ends of sampling, generates and energy storage electricity
The signal that sense both end voltage is proportional, including auxiliary winding L3 and bleeder circuit FB.Auxiliary winding
L3 and primary side winding L1 and vice-side winding L2 magnetic coupling, bleeder circuit FB and auxiliary winding L3
Connect, export the feedback parameters relevant to assisting winding L3 both end voltage.Due to auxiliary winding L3
Both end voltage is proportional to energy storage inductor both end voltage, therefore, and the feedback ginseng of bleeder circuit FB output
Amount can be proportional to energy storage inductor both end voltage.Feedback parameters may be used for carrying out current over-zero inspection
Survey.By controlling switch periods and/or the dutycycle of the ON/OFF of power switch S, can control
The output electric current that power stage circuit processed output is corresponding with the conduction phase angle of direct current forward position chopping signal,
Drive loaded work piece.For isolated changer, current over-zero detection is used for detecting institute in transformator
There is the total current zero crossing of winding.
Switching power source control circuit 24 includes current sampling signal input SEN and zero passage detection letter
Number input ZCS.Current sampling signal input SEN and current sampling resistor RSENUngrounded end
Connect, the current sampling signal of input primary side winding.Zero passage detection signal input part ZCS and voltage
The outfan of sample circuit 25 connects, and input feedback parameter is as zero passage detection signal.Auxiliary winding
L3 both end voltage is proportional to the energy storage inductor of isolated DC-DC converter 23, therefore zero passage
The signal of detection signal input part ZCS input is and the energy storage of isolated DC-DC converter 23
The signal that the voltage of inductance (namely primary side winding L1) is proportional.
It should be readily apparent to one skilled in the art that foregoing circuit structure not exclusive, can be used other
Any can realize utilizing and the energy storage inductor of isolated DC-DC converter 23 (namely former limit
Winding L1) the proportional signal of voltage carry out the circuit structure of current over-zero detection, such as,
Existing isolated DC-the DC converter of part does not use auxiliary winding, but primary side winding is passed through
Voltage sampling circuit outputs signals to zero passage detection signal input part.
Fig. 2 B is the working waveform figure of isolated DC-DC converter.Due to primary side winding L1
Both end voltage vL1Equal to busbar voltage v during power switch turns onbus, turn off at power switch S
Period is equal to-kTvo, kTFor the turn ratio of primary side winding L1 Yu vice-side winding L2, thus, such as figure
Shown in 2B, both end voltage v of auxiliary winding L3L3Lead at switch controlling signal indicated horsepower switch S
Logical period is equal to-k1vbus, wherein k1For assisting the coil ratio of winding L3 and primary side winding L1,
vbusFor being input to the busbar voltage of isolated DC-DC converter, it is direct current in the present embodiment
Forward position chopping signal.
Meanwhile, during switch controlling signal indicated horsepower switch S turns off, primary side winding electric current is
Zero, secondary winding current constantly reduces, before being reduced to 0, and vL3Maintain k2vONeighbouring change,
Secondary winding current may proceed to after being reduced to 0 oscillate around 0, vL30, k can be dropped rapidly to2
Coil ratio for auxiliary winding L3 and vice-side winding L2.During power switch S turns off,
Both end voltage v by detection auxiliary winding L3L3Drop to the moment of zero, it is possible to obtain transformator
Current zero-crossing point.
Due to primary side winding L1 both end voltage vL1Equal to busbar voltage v during power switch turns onbus,
Therefore, it can based on primary side winding L1 both end voltage vL1Or the auxiliary winding L3 being proportional to
Both end voltage vL3Carry out the leading edge detection of conduction phase angle.The present embodiment is to assist the two of winding L3
Terminal voltage vL3As a example by illustrate.
Fig. 2 C is the working waveform figure of the Switching Power Supply of first embodiment of the invention.As shown in Figure 2 C,
Busbar voltage vbusFor having the chopping signal of a conduction phase angle, its moment t ahead of the curve0By zero sudden change.
Accordingly, if for both end voltage v assisting winding L3L3In each switch periods, power is opened
Voltage during closing conducting is sampled, and can obtain with busbar voltage vbusSynchronize the bus of change
Voltage sampling signal vs, busbar voltage sampled signal vsSwitch periods T with Switching Power Supply 20sFor
Minimum interval changes.Due to, at the forward position moment t of controllable silicon regulator conduction phase angle0Front and back,
Busbar voltage vbusSudden change, and it is at other moment equal consecutive variations.So, forward position moment t0Before
After, busbar voltage sampled signal v of adjacent two switch periodssDifference bigger.Therefore, pass through
Detect busbar voltage sampled signal v of adjacent two switch periodssDifference whether more than predetermined threshold
vth, it is possible to achieve leading edge detection.
And owing to assisting both end voltage v of winding L3L3With output electricity during power switch S turns off
Pressure and current zero-crossing point are correlated with, and therefore, it can use it to the state of feedback power level circuit,
Generate switch controlling signal.For isolated changer, current zero-crossing point be in transformator all around
The total current zero crossing of group, that is, at current zero-crossing point, the electric current of all windings of transformator T is equal
It is zero.
Therefore, switching power source control circuit 24 can be according to the signal of zero passage detection signal input part
Carry out leading edge detection and the current over-zero detection of conduction phase angle simultaneously.
According to the forward position of the controllable silicon regulator conduction phase angle detected, that is, the copped wave of direct current forward position
The conducting forward position of signal, switching power source control circuit 24 can generate lead corresponding with conduction phase angle
Logical phase angle indication signal vLEAD, and and then by conduction phase angle indication signal vLEADAs controling parameter it
One, control the generation of switch controlling signal.In one preferred embodiment, Switching Power Supply control
Circuit 24 processed can generate corresponding reference voltage v according to the size of conduction phase angleREF.Reference voltage
vREFCharacterize the expected value of switch power supply output current.As a rule, conduction phase angle is the biggest, with reference to electricity
Pressure vREFThe biggest, to export higher expectation electric current.
Meanwhile, switching power source control circuit 24 is correlated with according to current sampling signal acquisition primary current
Information.
Obtaining after above-mentioned parameter, switching power source control circuit 24 according to current over-zero testing result,
Primary current relevant information and conduction phase angle indication signal (or preferably, generate according to this signal
Reference voltage) generate switch controlling signal Q, control power switch S turn-on and turn-off, and then make
Obtain the output electric current that power stage circuit output is corresponding with the conduction phase angle of direct current forward position chopping signal.
Fig. 3 A is the circuit diagram of the switching power source control circuit of first embodiment of the invention.As
Shown in Fig. 3 A, the switching power source control circuit 24 of the present embodiment include scaling signal obtain circuit 24a,
Leading edge detection circuit 24b, zero cross detection circuit 24c, conduction phase angle obtain circuit 24d and switch control
Signal generating circuit 24e processed.
Scaling signal obtains circuit 24a and zero passage detection signal input part ZCS and connects, and is used for exporting
First scaling signal and the second scaling signal.First scaling signal and isolated DC-DC converter
Both end voltage v of primary side winding L1 (that is, energy storage inductor) of 23L1Become the first ratio, second
Both end voltage v of primary side winding L1 of scaling signal and auxiliary winding L3L1Become the second ratio.At this
In embodiment, the first ratio can be identical with the second ratio, it is also possible to different, the first scaling signal
It does not interfere with each other with the second scaling signal.First scaling signal can be current signal can also be voltage
Signal, same, the second scaling signal can be current signal can also be voltage signal, both
Can have different types.
Leading edge detection circuit 24b obtains previous opening according to switch controlling signal Q and the first scaling signal
Busbar voltage sampled signal v in pass cycles_LastBusbar voltage sampled signal with current switch period
vs_Now, and in busbar voltage sampled signal v of current switch periods_NowMother with previous switch periods
Difference v of line voltage sampling signals_LastExceed predetermined threshold vthTime, export leading edge detection signal vFRONT,
Leading edge detection signal vFRONTThe forward position of instruction controllable silicon regulator conduction phase angle.
Zero cross detection circuit 24c carries out current over-zero detection according to the second scaling signal, exports zero passage
Point indication signal vZ。
Conduction phase angle obtains circuit 24d according to leading edge detection signal vFRONT, power supply good signal (POK)
Generate conduction phase angle indication signal vLEAD.Conduction phase angle indication signal vLEADIndicate the big of conduction phase angle
Little.Conduction phase angle obtains circuit 24d and various existing circuit structure can be used to realize.Specifically,
Can include obtaining conduction phase angle by rest-set flip-flop, its set end input leading edge detection signal,
Reset terminal input end cycle signal, in a preferred embodiment, it is possible to use power supply is well believed
Number (POK) signal is as the end cycle moment of end cycle signal designation direct current forward position chopping signal.
As shown in Figure 3 B, due to busbar voltage, that is, direct current forward position chopping signal is periodic signal, and
It is zero in each cycle for some time, therefore, by assisting winding or other modes from mother
The power supply signal v powered for switching power source control circuit that line voltage generatesccCan be before each direct current
Along chopping signal cycle raising and lowering once, meeting when being raised to thereon or drop to scheduled voltage
Out-put supply good signal (POK) signal, it can be as each direct current forward position chopping signal cycle
The mark terminated.Thus, rest-set flip-flop output is near the point of conduction phase angle forward position to end cycle
The signal of high level, its phase range that may be used for characterizing conduction phase angle.Certainly, this area skill
Art personnel are appreciated that end cycle signal can use other signal substitutings, and conduction phase angle obtains
Circuit 24d can also use other existing circuit structure to realize.
Switch controlling signal generative circuit 24e is according to zero crossing indication signal vZ, conduction phase angle instruction
Signal vLEADWith the current sampling signal v inputted from current sampling signal input SENSENGenerate switch
Control signal Q.Switch controlling signal generative circuit 24e can use various existing circuit structure
Realize.
The present embodiment detects thyristor regulating according to the signal proportional to energy storage inductor both end voltage
The forward position of joint device conduction phase angle, it is possible to reduce there is the unit of the switching power circuit of controllable silicon regulator
Number of devices, improves circuit level.
Meanwhile, during the switching power source control circuit of the present embodiment can be formed at same integrated circuit.
The pin detected due to leading edge detection and current over-zero can share zero passage detection signal input part, because of
This, it is possible to reduce the pin of integrated circuit, reduces integrated antenna package cost.
Fig. 4 is the circuit diagram of the switching power source control circuit of second embodiment of the invention.Such as figure
Shown in 4, ON-OFF control circuit 40 include scaling signal obtain circuit 41, leading edge detection circuit 42,
Zero cross detection circuit 43, conduction phase angle obtain circuit 44 and switch controlling signal generative circuit 45.
Scaling signal obtains circuit 41 and zero passage detection signal input part ZCS connects, and is used for exporting
First scaling signal and the second scaling signal.It includes controlled current source I1, current mirror MIR and turns
Change resistance Rs。
Similar with the analysis in first embodiment, the present embodiment with auxiliary winding L3 both end voltage is
Example illustrates, but, the voltage proportional to energy storage inductor all can be applicable to the present embodiment.
Current mirror MIR has reference current end r, the first mirror image end m1 and the second mirror image end m2.
The first mirror image end m1 of current mirror MIR is connected to leading edge detection circuit 42, provides it the first ratio
Example signal.The second mirror image end m2 of current mirror MIR is connected to zero cross detection circuit 43, Xiang Qiti
For the second scaling signal.
Controlled current source I1 is connected between reference current end r and earth terminal, generates and energy storage electricity
The current signal that sense both end voltage is proportional.As a rule, winding L3 can be assisted by arranging,
Auxiliary winding L3 produces with energy storage inductor (namely isolated DC in the present embodiment-direct current becomes
Primary side winding L1 of parallel operation) proportional voltage, controlled current source I1 is by accepting from auxiliary
The signal of winding L3 controls, and generates the current signal proportional to energy storage inductor both end voltage.
Transfer resistance RsIt is connected between described first mirror image end and earth terminal, will be multiple via current mirror
The current signal of system is converted to voltage signal.
First mirror image end m1 exports described first scaling signal.
Second mirror image end m2 exports described second scaling signal.
Owing to the control terminal voltage of controlled current source I1 is proportional to auxiliary winding L3 both end voltage,
Make controlled current source I1 be applied to current mirror MIR mirror image end electric current with auxiliary winding L3 two
Terminal voltage is proportional, therefore, and the first mirror image end m1's and the second mirror image end m2 of current mirror MIR
Circuit is all the most proportional with auxiliary winding L3 both end voltage, thus, it is possible at the first mirror image end m1
The first scaling signal and the second scaling signal is obtained respectively with the second mirror image end m2.
Fig. 5 is the circuit diagram that the preferred scaling signal of second embodiment of the invention one obtains circuit.
This preferred embodiment in, as it is shown in figure 5, controlled current source I1 include operational amplifier OP,
The first transistor M1.
The first transistor M1 is connected to reference current end r and the input of zero passage detection signal of current mirror
Between end ZCS.
The first input end of operational amplifier OP and earth terminal connection, the second input and zero passage inspection
The grid surveying signal input part ZCS connection, outfan and the first transistor M1 connects.At Fig. 5
In, first input end is in-phase input end, and the second input is inverting input.But, this
Skilled person is easy to understand, different according to circuit facilities, above-mentioned first input end and the
Two input annexations can be exchanged.
Current mirror MIR has reference current end r, the first mirror image end m1 and the second mirror image end m2.
As it is shown in figure 5, current mirror MIR includes transistor seconds M2, third transistor M3 and
Four transistor M4.Transistor seconds M2, third transistor M3 and the 4th transistor M4 are PMOS
Transistor, its source electrode is connected with pull-up voltage end, and the grid of three is connected with each other, transistor seconds
The grid of M2 is connected with drain electrode, and the drain electrode of transistor seconds M2 is as reference current end, and the trimorphism
The drain electrode of body pipe M3 is connected to the first mirror image end m1, and the drain electrode of the 4th transistor M4 is connected to second
Mirror image end m2.By arranging third transistor M3, the 4th transistor M4 and transistor seconds M2
Size so that the first mirror image end m1 and the second mirror image end m2 exports and reference current respectively
The electric current that end r is proportional.
Certainly, it will be understood by those skilled in the art that current mirror MIR is also with other this area
The disclosed circuit structure of known to technical staff or prior art realizes.Transistor seconds M2,
Three transistor M3 and the 4th transistor M4 are also not limited to PMOS transistor.For example, it is possible to by
Two-transistor M2, third transistor M3 and the 4th transistor M4 are set to nmos pass transistor, will
Pull-up voltage end replaces with earth terminal.
The first transistor M1 is connected to reference current end r and the zero passage detection signal of current mirror MIR
Between input ZCS, detect resistance RsIt is connected to the first mirror image end m1 of current mirror MIR and connects
Between ground end.The first mirror image end of current mirror MIR exports the first scaling signal.At transistor seconds
When M2, third transistor M3 and the 4th transistor M4 are PMOS transistor, the first transistor M1
For nmos pass transistor.
For convenience the principle of the present embodiment is illustrated, Fig. 5 also show power stage circuit
Auxiliary winding L3 and voltage sampling circuit FB.Voltage sampling circuit FB include being connected on auxiliary around
Divider resistance R between group L3 one end and earth terminalF1And RF2.During circuit work, operational amplifier
It is zero that OP makes the voltage of zero passage detection signal input part ZCS be clamped, and thus, zero passage detection is believed
The outflow electric current of number input ZCS is IZCS=-vL3/RF1, wherein, vL3For assisting the two ends of winding L3
Voltage.
Through the duplication of current mirror MIR, the first mirror image end m1 the electric current flowing to earth terminal is equal to
k3IZCS, wherein, k3Current replication coefficient for current mirror the first mirror image end.Therefore, detection resistance
RsBoth end voltage, that is, the magnitude of voltage of the first mirror image end m1 is-k3vL3Rs/RF1, at the present embodiment
In, it uses as the first scaling signal.
Equally, the electric current that the second mirror image end m2 flows out is equal to k4IZCS, wherein, k4For current mirror MIR
The current replication coefficient of the second mirror image end, itself and auxiliary winding L3 both end voltage vL3Become the second ratio,
Can be as the second scaling signal for zero cross detection circuit.
According in front analysis, assist winding L3 both end voltage vL3Power switch S turn on during and
Busbar voltage vbusIt is proportional, it follows that the magnitude of voltage of the first mirror image end m1 is also and busbar voltage
vbusProportional.By the magnitude of voltage of the first mirror image end m1 being sampled during power switch S conducting,
Can obtain and busbar voltage vbusSynchronize the busbar voltage sampled signal of change.
As shown in Figure 4, leading edge detection circuit 42 includes voltage register circuit 42a and threshold ratio relatively
Circuit 42b.
Voltage register circuit 42a obtains previous opening according to switch controlling signal Q and the first scaling signal
Busbar voltage sampled signal v in pass cycles_LastBusbar voltage sampled signal with current switch period
vs_Now, busbar voltage sampled signal characterizes described first scaling signal at switch controlling signal Q for leading
Value during logical state.
In circuit shown in Fig. 4, voltage register circuit 42a includes signal input part in, first defeated
Go out to hold out1, the second outfan out2, the first switch S1, second switch S2, the first electric capacity C1
With the second electric capacity C2.
First switch S1 is connected between signal input part in and the first outfan out1, according to
Switch controlling signal Q turn-on and turn-off.
Second switch S2 is connected between the first outfan out1 and the second outfan out2, root
Inversion signal Q according to switch controlling signal is non-conduction and turns off.
First electric capacity C1 is connected between the first outfan out1 and earth terminal；Second electric capacity C2
It is connected between the second output and ground.
Busbar voltage sampled signal v of the first outfan out1 output current switch periods_Now。
Second outfan out2 exports busbar voltage sampled signal v of previous switch periodss_Last。
During switch controlling signal Q indicated horsepower switch conduction, the first switch S1 conducting, the
Two switch S2 turn off.It is input to first scaling signal of signal input part in the first electric capacity C1
Charging, owing to the first scaling signal is equal to-k3vL3Rs/RF1, and now power switch S conducting, vL3
Equal to-k1vbus, thus can obtain, the voltage v of the first outfan out1out1For:
vout1=(k1k3Rs/RF1)vbus
It can represent busbar voltage sampled signal v of current switch periods_Now。
During switch controlling signal Q indicated horsepower switch OFF, the first switch S1 turns off, the
Two switch S2 conductings, the second electric capacity C2 is charged by the first electric capacity C1, at the electricity of the second electric capacity C2
When capacitance is less than the capacitance of the first electric capacity C1, after charging complete, the electricity of the second outfan out2
Pressure vout2=vout1, and the voltage influence for first input end out1 is little.
After new switch periods starts, the first switch S1 turns on again, and second switch S2 is again
Turn off.Now, the voltage of the second outfan out2 keeps constant, for the bus of previous switch periods
Voltage sampling signal vs_Last, and the voltage of the first outfan out1 is electrically charged equal to the first ratio letter
Number, namely busbar voltage sampled signal v equal to current switch periods_Now。
Threshold value comparison circuit 42b is in busbar voltage sampled signal v of current switch periods_NowWith previous
Busbar voltage sampled signal v of switch periodss_LastDifference exceed predetermined threshold vthTime, before output
Along detection signal.
As shown in Figure 4, threshold value comparison circuit 42b includes voltage source and comparator CMP.
The busbar voltage sampled signal of the first input end input current switch period of comparator CMP
vs_Now, that is, be connected with the first outfan out1 of voltage register circuit 42a.
Voltage source is connected to busbar voltage sampled signal v of previous switch periodss_LastInput and
Between second input of comparator CMP, that is, be connected to the second of voltage register circuit 42a
Between outfan out2 and second input of comparator CMP.The magnitude of voltage of voltage source is predetermined threshold
Value vth。
In the diagram, the first input end of comparator CMP is in-phase input end, and the second input is
Inverting input.Thus, the leading edge detection signal virtual value of its output is high level.
Zero cross detection circuit 43 carries out secondary current zero passage detection according to the second scaling signal, output
Zero crossing indication signal vZ。
Conduction phase angle obtains circuit 44 according to leading edge detection signal vFRONTObtain conduction phase angle instruction letter
Number vLEAD.Conduction phase angle obtains circuit 44 and various existing circuit structure can be used to realize.
Switch controlling signal generative circuit 45 is according to zero crossing indication signal vZ, conduction phase angle instruction
Signal vLEADWith the current sampling signal v inputted from current sampling signal input SENSENGenerate switch
Control signal.Switch controlling signal generative circuit 45 can use various existing circuit structure to realize.
The present embodiment detects thyristor regulating according to the signal proportional to energy storage inductor both end voltage
The forward position of joint device conduction phase angle, it is possible to reduce there is the unit of the switching power circuit of controllable silicon regulator
Number of devices, improves circuit level.
Meanwhile, during the switching power source control circuit of the present embodiment can be formed at same integrated circuit.
The pin detected due to leading edge detection and current over-zero can share zero passage detection signal input part, because of
This, it is possible to reduce the pin of integrated circuit, reduces integrated antenna package cost.
Fig. 6 A is the circuit diagram of the Switching Power Supply of third embodiment of the invention.As shown in Figure 6A,
Switching Power Supply 60 includes alternating current input vin, controllable silicon regulator 61, rectifier bridge 62, non-every
From formula DC-DC converter 63, switching power source control circuit 64 and voltage sampling circuit 65.?
In the present embodiment, illustrate as a example by the non-isolated DC-DC converter of voltage-dropping type topology.
But, it will be understood by those skilled in the art that other type of non-isolated DC-DC converter
May also apply to the present embodiment.
Alternating current input vinInput AC electricity.
Controllable silicon regulator 61 for carrying out forward position copped wave, output tool to the ac signal of input
There is the exchange forward position chopping signal of adjustable conduction phase angle.
Exchange forward position chopping signal is converted to direct current forward position chopping signal and passes through voltage by rectifier bridge 62
Bus exports non-isolated DC-DC converter 63.
Non-isolated DC-DC converter 63 is connected to voltage bus, believes the copped wave of direct current forward position
Number convert, export the direct current output electricity corresponding with the conduction phase angle of direct current forward position chopping signal
Stream, drives loaded work piece.
Wherein, non-isolated DC-DC converter 63 includes commutation diode D2, power switch
S, output capacitance CO, energy storage inductor LB.Commutation diode D2 is connected to voltage bus and intermediate ends
Between i.Power switch S is connected between holding between i and earth terminal.Energy storage inductor LBIt is connected to
Between intermediate ends i and outfan.Output capacitance COIt is connected between outfan and voltage bus.
Voltage sampling circuit 65 is for energy storage inductor LBBoth end voltage is sampled, and obtains and stores up
Can inductance LBThe signal that both end voltage is proportional.This signal can be supplied to switching power source control circuit
64 to carry out leading edge detection and current over-zero detection.
Preferably, voltage sampling circuit 65 includes assisting winding L3 ' and to auxiliary winding L3 '
Both end voltage carries out the bleeder circuit FB ' of dividing potential drop, itself and energy storage inductor LBMagnetic coupling, generates and stores up
Can inductance LBThe voltage signal that both end voltage is proportional.Certainly, it should be readily apparent to one skilled in the art that
Other various modes can also be used to gather energy storage inductor LBBoth end voltage is to be applicable to the present invention.
Switching power source control circuit 64 includes zero passage detection signal input part ZCS.Zero passage detection signal
The outfan of input ZCS and bleeder circuit FB ' connects, and input feedback parameter is as zero passage detection
Signal.Auxiliary winding L3 ' both end voltage is electric with the energy storage of non-isolated DC-DC converter 23
Sense both end voltage proportional, therefore zero passage detection signal input part ZCS input signal right and wrong every
From the signal that the voltage of the energy storage inductor of formula DC-DC converter 63 is proportional.
Fig. 6 B is the working waveform figure of non-isolated DC-DC converter.As shown in Figure 6B,
Power switch S, according to the control turn-on and turn-off of switch controlling signal Q, turns at power switch S
Period, that is, t0-t1In time interval, energy storage inductor LBElectric current linear rise, now, storage
Can inductance LBBoth end voltage vLEqual to vbus-vO, and owing to non-isolated DC-DC converter exports
Voltage vOIt is basically unchanged at short notice, therefore, energy storage inductor LBBoth end voltage vLAt power switch
It is with busbar voltage v during S conductingbusThe parameter of change, that is, by multiple switch periods
Power switch S conducting during to energy storage inductor LBBoth end voltage vLSampling, it is thus achieved that sampled signal
It is to characterize busbar voltage vbusThe parameter of changing condition.Therefore, this signal is before conduction phase angle
Transition is there will be along place.Therefore, adopt by comparing the energy storage inductor voltage in two adjacent switch cycles
Whether the difference of sample signal is more than predetermined threshold, it is possible to achieve detection conduction phase angle forward position.
During power switch S turns off, energy storage inductor LBElectric current linear decline (t1-t2Time zone
In), after dropping to zero, start (the t that vibrates2-t3In time interval).At t1-t2In time interval,
Energy storage inductor LBBoth end voltage vLEqual to output voltage vO, at t2-t3In time interval, energy storage electricity
Sense LBBoth end voltage vLVibration, arrives dropping to after peak zero can enter by detecting this vibration
Row current over-zero detects.For non-isolated DC-DC converter, current over-zero detection is used
Energy storage inductor L in detection changerBCurrent zero-crossing point.
Thus, based on energy storage inductor LBBoth end voltage vLWith the phase of shutoff during power switch S turns on
Between different attribute, it is possible to use the signal that is proportional to (such as utilizes auxiliary winding L3 to produce
Induced voltage) realize carry out simultaneously leading edge detection and current over-zero detection.
Fig. 6 C is the circuit diagram of the switching power source control circuit of third embodiment of the invention.As
Shown in Fig. 6 C, the switching power source control circuit 64 of the present embodiment include scaling signal obtain circuit 64a,
Leading edge detection circuit 64b, zero cross detection circuit 64c, conduction phase angle obtain circuit 64d and switch control
Signal generating circuit 64e processed.
Scaling signal obtains circuit 64a and zero passage detection signal input part ZCS and connects, and is used for exporting
First scaling signal and the second scaling signal.First scaling signal and non-isolated DC-dc conversion
The energy storage inductor L of device 23BBoth end voltage vLBecome the first ratio, the second scaling signal and energy storage electricity
Sense LBBoth end voltage vLBecome the second ratio.In the present embodiment, the first ratio and the second ratio can
With identical, it is also possible to different, the first scaling signal and the second scaling signal do not interfere with each other.First ratio
Example signal can be current signal can also be voltage signal, same, the second scaling signal is permissible
Be current signal can also be voltage signal, both can have different types.
Preferably, scaling signal obtains circuit 64a and can use first embodiment or the second embodiment
Described in circuit structure.
Leading edge detection circuit 64b obtains previous opening according to switch controlling signal Q and the first scaling signal
Busbar voltage sampled signal v in pass cycles_LastBusbar voltage sampled signal with current switch period
vs_Now, and in busbar voltage sampled signal v of current switch periods_NowMother with previous switch periods
Difference v of line voltage sampling signals_LastExceed predetermined threshold vthTime, export leading edge detection signal vFRONT,
Leading edge detection signal vFRONTThe forward position of instruction controllable silicon regulator conduction phase angle.
Preferably, scaling signal obtains circuit 64b and can use the circuit described in the second embodiment
Structure.
Zero cross detection circuit 64c carries out current over-zero detection according to the second scaling signal, exports zero passage
Point indication signal vZ。
Conduction phase angle obtains circuit 64d according to leading edge detection signal vFRONTWith power supply good signal
(POK) conduction phase angle indication signal v is generatedLEAD.Conduction phase angle indication signal vLEADInstruction conducting phase
The size at angle.Conduction phase angle obtains circuit 64d and various existing circuit structure can be used to realize.
Specifically, realized by the rest-set flip-flop described in first embodiment.Certainly, people in the art
Member is appreciated that end cycle signal can use other signal substitutings, and conduction phase angle obtains circuit
64d can also use other existing circuit structure to realize.
Switch controlling signal generative circuit 64e is according to zero crossing indication signal vZ, conduction phase angle instruction
Signal vLEADGenerate switch controlling signal Q.Switch controlling signal generative circuit 64e can use respectively
Plant existing circuit structure to realize.
The present embodiment detects thyristor regulating according to the signal proportional to energy storage inductor both end voltage
The forward position of joint device conduction phase angle, it is possible to reduce there is the unit of the switching power circuit of controllable silicon regulator
Number of devices, improves circuit level.
Meanwhile, during the switching power source control circuit of the present embodiment can be formed at same integrated circuit.
The pin detected due to leading edge detection and current over-zero shares zero passage detection signal input part, therefore,
The pin of integrated circuit can be reduced, reduce integrated antenna package cost.
Fig. 7 is the flow chart of the frontier inspection of third embodiment of the invention.As it is shown in fig. 7,
Described method includes:
Step 710, obtain the first scaling signal, described first scaling signal and energy storage inductor two ends
Voltage becomes the first ratio.
Step 720, obtain and deposit previous according to switch controlling signal and described first scaling signal
The busbar voltage sampled signal of switch periods and the busbar voltage sampled signal of current switch period, institute
Stating busbar voltage sampled signal and characterizing described first scaling signal is conducting state at switch controlling signal
The value of period.
That is, described first scaling signal is adopted during switch controlling signal is conducting state
Sample, obtains first scaling signal value during switch controlling signal is conducting state, deposits previous
The busbar voltage sampled signal that this value is previous switch periods of switch periods, by current switch period
This value as the busbar voltage sampled signal of current switch period.
Step 730, described current switch period busbar voltage sampled signal with previous switch week
When the difference of the busbar voltage sampled signal of phase exceedes predetermined threshold, export leading edge detection signal.
The method of the present embodiment had both gone for isolated DC-DC converter, it is also possible to suitable
For non-isolated DC-DC converter.
The present embodiment detects thyristor regulating according to the signal proportional to energy storage inductor both end voltage
The forward position of joint device conduction phase angle, it is possible to reduce there is the unit of the switching power circuit of controllable silicon regulator
Number of devices, improves circuit level.
Meanwhile, during the switching power source control circuit of the present embodiment can be formed at same integrated circuit.
The pin detected due to leading edge detection and current over-zero shares zero passage detection signal input part, therefore,
The pin of integrated circuit can be reduced, reduce integrated antenna package cost.
The foregoing is only the preferred embodiments of the present invention, be not limited to the present invention, for this
For skilled person, the present invention can have various change and change.All spirit in the present invention
Any modification, equivalent substitution and improvement etc. with being made within principle, should be included in the present invention's
Within protection domain.
Claims (15)
1. a switching power source control circuit, includes controllable silicon regulator and direct current-straight for control
The Switching Power Supply of current converter, described switching power source control circuit include zero passage detection signal input part,
Scaling signal obtains circuit, zero cross detection circuit and leading edge detection circuit；
Described scaling signal obtains circuit and described zero passage detection signal input part connects, and is used for exporting
First scaling signal and the second scaling signal, described first scaling signal and DC-DC converter
Energy storage inductor both end voltage becomes the first ratio, described second scaling signal and described energy storage inductor voltage
Both end voltage becomes the second ratio；
Before described leading edge detection circuit obtains according to switch controlling signal and described first scaling signal
The busbar voltage sampled signal of one switch periods and the busbar voltage sampled signal of current switch period,
And the busbar voltage of busbar voltage sampled signal and the previous switch periods at described current switch period
When the difference of sampled signal exceedes predetermined threshold, export leading edge detection signal；Wherein, described forward position
The forward position of detection signal designation controllable silicon regulator conduction phase angle, described busbar voltage sampled signal table
Levy described first scaling signal value during switch controlling signal is conducting state；
Described zero cross detection circuit carries out current over-zero detection according to described second scaling signal.
Switching power source control circuit the most according to claim 1, it is characterised in that described
Leading edge detection circuit includes voltage register circuit and threshold value comparison circuit:
Described voltage register circuit obtains according to switch controlling signal and the first scaling signal and deposits
The busbar voltage sampled signal of previous switch periods and the busbar voltage sampled signal of current switch period；
Described threshold value comparison circuit in the busbar voltage sampled signal of described current switch period with front
When the difference of the busbar voltage sampled signal of one switch periods exceedes predetermined threshold, export leading edge detection
Signal.
Switching power source control circuit the most according to claim 2, it is characterised in that described
Voltage register circuit include signal input part, the first outfan, the second outfan, first switch,
Second switch, the first electric capacity and the second electric capacity；
Described first switch is connected between signal input part and the first outfan, according to on-off control
Signal conduction and shutoff；
Described second switch is connected between the first outfan and the second outfan, according to on-off control
The inversion signal turn-on and turn-off of signal；
Described first electric capacity is connected between the first output and ground；
Described second electric capacity is connected between the second output and ground；
The busbar voltage sampled signal of described first outfan output current switch period；
Described second outfan exports the busbar voltage sampled signal of previous switch periods.
Switching power source control circuit the most according to claim 2, it is characterised in that described
Threshold value comparison circuit includes voltage source and comparator；
The first input end of described comparator inputs the busbar voltage sampling of described current switch period
Signal；
Described voltage source be connected to the busbar voltage sampled signal of previous switch periods input and
Between second input of described comparator.
Switching power source control circuit the most according to claim 1, it is characterised in that described
Scaling signal obtains circuit and includes controlled current source, current mirror and transfer resistance；
Described current mirror has reference current end, the first mirror image end and the second mirror image end；
Described controlled current source is connected between described reference current end and earth terminal, generates with described
The current signal that energy storage inductor both end voltage is proportional；
Described transfer resistance is connected between described first mirror image end and earth terminal；
Described first mirror image end exports described first scaling signal；
Described second mirror image end exports described second scaling signal.
Switching power source control circuit the most according to claim 5, it is characterised in that controlled
Current source includes operational amplifier, the first transistor；
The first input end of described operational amplifier and earth terminal connection, the second input and described mistake
The grid of zero detection signal input part connection, outfan and described the first transistor connects；
Described the first transistor is connected to the reference current end of described current mirror and described zero passage detection
Between signal input part.
Switching power source control circuit the most according to claim 1, it is characterised in that described
DC-DC converter is isolated DC-DC converter or non-isolated DC-dc conversion
Device.
Switching power source control circuit the most according to claim 1, it is characterised in that described
Scaling signal obtains circuit and generates described according to the both end voltage of the auxiliary winding coupled with energy storage inductor
First scaling signal and the second scaling signal.
Switching power source control circuit the most according to claim 1, it is characterised in that described
Switching power source control circuit also includes that conduction phase angle obtains circuit, for believing according to described leading edge detection
Number and power supply good signal (POK) generate conduction phase angle indication signal.
10. a Switching Power Supply, including controllable silicon regulator, rectifier bridge, DC-dc conversion
Device and switching power source control circuit as claimed in any one of claims 1-9 wherein.
11. 1 kinds of leading edge detection circuit, for detecting the forward position of controllable silicon regulator conduction phase angle,
Described leading edge detection circuit includes:
Voltage register circuit, obtains previous switch week according to switch controlling signal and the first scaling signal
The busbar voltage sampled signal of phase and the busbar voltage sampled signal of current switch period, described bus
Voltage sampling signal characterizes described first scaling signal during switch controlling signal is conducting state
Value, described first scaling signal becomes the first ratio with DC-to-DC converter energy storage inductor voltage；
Threshold value comparison circuit, the busbar voltage sampled signal at described current switch period is opened with previous
When the difference of the busbar voltage sampled signal in pass cycle exceedes predetermined threshold, export leading edge detection signal.
12. leading edge detection circuit according to claim 11, it is characterised in that described electricity
Pressure register circuit include signal input part, the first outfan, the second outfan, the first switch, the
Two switches, the first electric capacity and the second electric capacity；
Described first switch is connected between signal input part and the first outfan, according to on-off control
Signal conduction and shutoff；
Described second switch is connected between the first outfan and the second outfan, according to on-off control
The inversion signal turn-on and turn-off of signal；
Described first electric capacity is connected between the first output and ground；
Described second electric capacity is connected between the second output and ground；
The busbar voltage sampled signal of described first outfan output current switch period；
Described second outfan exports the busbar voltage sampled signal of previous switch periods.
13. leading edge detection circuit according to claim 11, it is characterised in that described threshold
Value comparison circuit includes voltage source and comparator；
The first input end of described comparator inputs the busbar voltage sampling of described current switch period
Signal；
Described voltage source be connected to the busbar voltage sampled signal of previous switch periods input and
Between second input of described comparator.
14. leading edge detection circuit according to claim 11, it is characterised in that before described
Also include that along testing circuit the first scaling signal obtains circuit, be used for obtaining described first scaling signal.
15. 1 kinds of frontier inspections, for detecting the forward position of controllable silicon regulator conduction phase angle,
Described method includes:
Obtain the first scaling signal, described first scaling signal and DC-to-DC converter energy storage electricity
Sense both end voltage becomes the first ratio；
The bus of previous switch periods is obtained according to switch controlling signal and described first scaling signal
The busbar voltage sampled signal of voltage sampling signal and current switch period, described busbar voltage is sampled
First scaling signal value during switch controlling signal is conducting state described in characterization；
Busbar voltage sampled signal and the bus of previous switch periods at described current switch period
When the difference of voltage sampling signal exceedes predetermined threshold, export leading edge detection signal.
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| CN110262609B (en) * | 2019-07-01 | 2020-06-26 | 四川英杰电气股份有限公司 | Circuit driving control method, system, power regulation system and equipment terminal |
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| WO2007088577A1 (en) * | 2006-01-31 | 2007-08-09 | Mitsumi Electric Co., Ltd. | Switching power supply apparatus and semiconductor integrated circuit for controlling power supply |
| US8912781B2 (en) * | 2010-07-30 | 2014-12-16 | Cirrus Logic, Inc. | Integrated circuit switching power supply controller with selectable buck mode operation |
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