CN209001807U - A kind of zero current detection and regulating system - Google Patents
A kind of zero current detection and regulating system Download PDFInfo
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- CN209001807U CN209001807U CN201821983630.5U CN201821983630U CN209001807U CN 209001807 U CN209001807 U CN 209001807U CN 201821983630 U CN201821983630 U CN 201821983630U CN 209001807 U CN209001807 U CN 209001807U
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Abstract
The utility model discloses a kind of zero current detection and regulating systems, including sequentially connected power stage circuit, comparison threshold circuit, zero cross detection circuit and switching power source control circuit, switching power source control circuit is also connect with power stage circuit, comparison threshold circuit is also connected with compensation circuit, compensation circuit is also connected with sample circuit, and sample circuit is used to acquire the input voltage of power stage circuit and/or the signal of output voltage and/or temperature.The utility model is using the input voltage and/or output voltage of compensation circuit acquisition power stage circuit and/or the case where temperature change and to comparison threshold circuit input offset signal, the thresholding of comparison threshold circuit and the zero current speed and precision of zero cross detection circuit are automatically adjusted, while can compensate for input voltage and/or output voltage and/or temperature change because of power stage circuit to zero current detection deviation brought by the detection speed of zero cross detection circuit and the influence of power stage circuit power tube internal resistance.
Description
Technical field
The utility model relates to switch power converter technical field, especially a kind of zero current detection and regulating system.
Background technique
The common ground of synchronous rectifying switching power source converter is that afterflow uses continued flow switch pipe and substitutes freewheeling diode,
To reduce power loss, transfer efficiency is improved.Switch power converter is in inductor current continuous mode in heavy duty
(CCM).In light load, duty ratio decline, inductive current decline, to be in discontinuous mode (DCM).In order to anti-
Only inductive current is counter fills, and leads to decrease in efficiency of the synchronous rectifying switching power source converter in light load, when electric current declines
When being zero, need to turn off continued flow switch.When thering is electric current to flow through above continued flow switch pipe, since there are electric conductions for continued flow switch pipe
Resistance, therefore there are voltage difference between the source electrode and drain electrode of continued flow switch pipe, the voltage difference direct ratio and the electric current flowed through, once it is electric
It flows down and drops to zero, the source-drain voltage difference of continued flow switch pipe also drops to zero.Therefore existing synchronous rectifying switching power source converter
Traditional method be the source electrode and drain electrode voltage difference of the two ends for comparing continued flow switch pipe with comparator, once discovery power tube source and drain two
End voltage difference drops to zero, that is, thinks that electric current is zero, turns off afterflow power tube at once.Simultaneously because comparator, which exists, compares speed
Problem, therefore generally can also increase a threshold circuit in advance in source-drain voltage difference, it allows comparator to be compared in advance, guarantees
Inductive current is just to zero when comparator exports comparison signal.
But popularizing due to the electronic equipments fast charge technology such as current phone, apply the Switching Power Supply in fast charge product scope
The input and output voltage range of converter is very big.And inductive discharge slope is directly proportional to difference is output and input, due to turning
The variation of the input and output voltage of parallel operation, the velocity variations for causing electric current to decline are very big, therefore in different input and output situations
Under, if the comparison speed of comparison threshold circuit and comparator is fixed, it will result in zero current detection result with input and output
There is very large deviation in variation.When Switching Power Supply charges to conventional equipment, output voltage 5V.And when Switching Power Supply is set to fast charge
When standby charging, output voltage may be 9V, and 12V is even as high as 20V.For this traditional method, if comparison threshold circuit and
The comparison speed of zero-crossing comparator, in the case of meeting output 5V, electric current just to zero when, comparator exports zero current signal,
So in the case where exporting 9V 12V, faster due to electric current decrease speed, when zero-crossing comparator exports zero current signal
When, inductor current value has been changed to negative value, to cause loss of efficiency.There are self-heatings for Simultaneous Switching power adapter
The problem of, since fever comparator speed can change, it will cause the deviation of zero current detection.Equally, power tube internal resistance exists
Under different temperatures, conducting resistance is also different, therefore in same current, and power tube both ends pressure difference can change, and will also result in
The deviation of zero current detection result.
Summary of the invention
In order to solve the above technical problems, the utility model provides a kind of zero current detection and regulating system, can
According to system temperature variation and/or voltage input variation and/or voltage output variation, the comparison threshold of automatic regulating system and/
Or the speed and precision of comparator speed zero current detection.
The technical scheme adopted by the utility model to solve the technical problem is as follows: a kind of zero current detection and regulating system,
It is described to open including sequentially connected power stage circuit, comparison threshold circuit, zero cross detection circuit and switching power source control circuit
Powered-down source control circuit is also connect with power stage circuit, and the comparison threshold circuit is also connected with compensation circuit, the compensation electricity
Road is also connected with sample circuit, the sample circuit be used to acquire power stage circuit input voltage and/or output voltage and/or
The signal of temperature.
Further, the compensation circuit is also connected with zero cross detection circuit, for changing the biased electrical of zero cross detection circuit
Stream.
Further, the sample circuit includes input voltage sampling unit, output voltage sampling unit and temperature detection list
The input terminal of member, the input voltage sampling unit is connected with power stage circuit power end, the input voltage sampling unit
The connection of first signal acquisition terminal of output end and compensation circuit, the input terminal and power stage circuit of the output voltage sampling unit
Output end is connected, and the output end of the output voltage sampling unit and the second signal collection terminal of compensation circuit connect, the temperature
The output end of degree detection unit is connected with the third signal acquisition terminal of compensation circuit.
Further, the sample circuit includes input voltage sampling unit and temperature detecting unit, and the input voltage is adopted
The input terminal of sample unit is connected with power stage circuit power end, the output end of the input voltage sampling unit and compensation circuit
The connection of first signal acquisition terminal, the output end of the temperature detecting unit are connected with the third signal acquisition terminal of compensation circuit.
Further, the sample circuit includes output voltage sampling unit and temperature detecting unit, and the output voltage is adopted
The input terminal of sample unit is connected with power stage circuit output end, the output end of the output voltage sampling unit and compensation circuit
The connection of second signal collection terminal, the output end of the temperature detecting unit are connected with the third signal acquisition terminal of compensation circuit.
Further, the sample circuit includes input voltage sampling unit and output voltage sampling unit, the input electricity
The input terminal of pressure sampling unit is connected with power stage circuit power end, the output end and compensation electricity of the input voltage sampling unit
First signal acquisition terminal on road connects, and the input terminal of the output voltage sampling unit is connected with power stage circuit output end, institute
The second signal collection terminal of the output end and compensation circuit of stating output voltage sampling unit connects.
Further, the sample circuit includes input voltage sampling unit, the input terminal of the input voltage sampling unit
It is connected with power stage circuit power end, the output end of the input voltage sampling unit and the first signal acquisition terminal of compensation circuit
Connection.
Further, the sample circuit includes output voltage sampling unit, the input terminal of the output voltage sampling unit
It is connected with power stage circuit output end, the output end of the output voltage sampling unit and the second signal collection terminal of compensation circuit
Connection.
Further, the sample circuit includes temperature detecting unit, the output end and compensation electricity of the temperature detecting unit
The third signal acquisition terminal on road is connected.
The beneficial effects of the utility model are: the utility model can adapt to output and input variation automatically, compensation is utilized
Circuit acquires the input voltage and/or output voltage and/or the case where temperature change and to comparison threshold circuit of power stage circuit
Input offset signal can automatically adjust the thresholding of comparison threshold circuit and the zero current speed and precision of zero cross detection circuit,
It can compensate for input voltage and/or output voltage and/or temperature change because of power stage circuit to zero cross detection circuit simultaneously
Detect zero current detection deviation brought by the influence of the power tube internal resistance of speed and power stage circuit；It is opened up due to all at present
The synchronous rectifying switching power source converter of structure is flutterred, continued flow switch is all used and substitutes freewheeling diode, therefore the circuit can be with
Very easily it is applied to the synchronous rectification switch of the various topological structures such as DC-DC switch power source, DC-AC Switching Power Supply
In power adapter, to efficiency of the lifting switch power supply under light load.
Detailed description of the invention
The present invention will be further described with reference to the accompanying drawings and examples.
Fig. 1 is a kind of functional block diagram of preferred embodiment of the utility model；
Fig. 2 is the circuit structure diagram of the first embodiment of the utility model；
Fig. 3 is the circuit structure diagram of input voltage sampling unit in the first embodiment of the utility model；
Fig. 4 is the circuit structure diagram of compensation circuit in the first embodiment of the utility model；
Fig. 5 is the circuit structure diagram of comparison threshold circuit in the first embodiment of the utility model；
Fig. 6 is the circuit diagram of switching power source control circuit in the first embodiment of the utility model；
Fig. 7 is the circuit structure diagram of second of embodiment of the utility model；
Fig. 8 is the circuit structure diagram of comparison threshold circuit in second of embodiment of the utility model；
Fig. 9 is the circuit structure diagram of compensation circuit in second of embodiment of the utility model；
Figure 10 is the third circuit structure diagram of the compensation circuit of the utility model.
Specific embodiment
In order to make the purpose of the utility model, technical solutions and advantages more clearly understood, below with reference to embodiment and
The technical effect of the design of the utility model, specific structure and generation is clearly and completely described in attached drawing, with sufficiently geographical
Solve the purpose of this utility model, feature and effect.Obviously, described embodiment is that a part of the utility model is implemented
Example, rather than whole embodiments, those skilled in the art's other realities obtained without creative efforts
Example is applied, the range of the utility model protection is belonged to.
It referring to Fig.1, is a kind of preferably embodiment, a kind of zero current detection and regulating system, including it is sequentially connected
Power stage circuit 1, comparison threshold circuit 2, zero cross detection circuit 3 and switching power source control circuit 4, the Switching Power Supply control
Circuit 4 is also connect with power stage circuit 1, and the comparison threshold circuit 2 is also connected with compensation circuit 5, and the compensation circuit 5 also connects
It is connected to sample circuit 6, the sample circuit 6 is used to acquire the input voltage and/or output voltage and/or temperature of power stage circuit 1
The signal of degree.
Preferably, the compensation circuit 5 is also connected with zero cross detection circuit 3, for changing the biasing of zero cross detection circuit 3
Electric current realizes the detection speed for adjusting zero cross detection circuit 3.
The power stage circuit 1 includes at least main switch M1 and continued flow switch pipe M2, by using two on state resistances
Extremely low power MOS pipe simultaneously realizes 1 output signal duty of power stage circuit according to the control signal of switching power source control circuit 4
The adjusting of ratio is mainly used in the conversion of AC-DC conversion or DC boosting or DC decompression.
The sample circuit 6 includes input voltage sampling unit 61 and/or output voltage sampling unit 62 and/or temperature inspection
Unit 63 is surveyed, the input terminal of the input voltage sampling unit 61 is connected with 1 power end of power stage circuit, and the input voltage is adopted
The output end of sample unit 61 is connect with the first signal acquisition terminal of compensation circuit 5, the input of the output voltage sampling unit 62
End is connected with 1 output end of power stage circuit, the output end of the output voltage sampling unit 62 and the second signal of compensation circuit 5
Collection terminal connection, the output end of the temperature detecting unit 63 are connected with the third signal acquisition terminal of compensation circuit 5.
The input voltage sampling unit 61 is used to acquire the input voltage of power stage circuit 1 and sends out input voltage signal
Give compensation circuit 5.
The output voltage sampling unit 62 is used to acquire the output voltage of power stage circuit 1 and sends out output voltage signal
Give compensation circuit 5.
The temperature detecting unit 63 is used to acquire the temperature of power stage circuit 1 and temperature signal is sent to compensation circuit
5。
Wherein, if the input voltage of the power stage circuit 1 remains unchanged or when variation range is little, institute can not be used
State input voltage sampling unit 61；It, can be with if the output voltage of the power stage circuit 1 remains unchanged or variation range is little
The output voltage sampling unit 62 is not used；If the range of temperature of the power stage circuit 1 is little, it can not use
Temperature detecting unit 63.
The comparison signal of output of the switching power source control circuit 4 according to zero cross detection circuit 3 is electric to control power stage
The working condition of the main switch M1 and continued flow switch pipe M2 on road 1, to adjust accounting for for main switch M1 and continued flow switch pipe M2
Empty ratio realizes the stabilization and duty ratio of the output signal of power stage circuit 1.
The compensation circuit 5 is according to the real-time input voltage signal and/or power stage circuit 1 for receiving power stage circuit 1
Real-time output voltage signal and/or power stage circuit 1 the coherent signals such as real time temperature signal be overlapped after as compensation
Signal output, to 2 input offset signal of comparison threshold circuit, to adjust the voltage comparison threshold of zero cross detection circuit 3.
The thermal compensation signal and acquisition continued flow switch pipe M2 source electrode and leakage that the comparison threshold circuit 2 inputs compensation circuit 5
Voltage differential signal between pole is overlapped to form comparison threshold signal, and exports in real time relatively door to zero cross detection circuit 3
Signal is limited, to realize the purpose for adjusting 3 comparison threshold of zero cross detection circuit.
The zero cross detection circuit 3 is mainly using zero-crossing comparator U1 as thresholding comparator processor, the Zero-cross comparator
The non-inverting input terminal of device U1 is connected with the first input end of comparison threshold circuit 2, the inverting input terminal of the zero-crossing comparator U1
It is connected with the second output terminal of comparison threshold circuit 2, wherein the bias current of the zero-crossing comparator U1 adjusts input terminal and may be used also
It is connected with the output end of compensation circuit 5, i.e., thermal compensation signal is also sent to zero cross detection circuit 3, realizes and adjusting zero passage detection
Adjust the detection speed of zero cross detection circuit 3 when the comparison threshold of circuit 3 simultaneously, the zero-crossing comparator U1 is by non-inverting input terminal
Comparison signal is compared and exported with the input signal of inverting input terminal, and comparison signal is fed back into Switching Power Supply control electricity
Road 4.
Referring to Fig. 2, it is the first embodiment, is that the utility model is applied in one of step-up DC-DC converter
Embodiment, implementing sample circuit 6 described in embodiment at the first includes input voltage sampling unit 61, output voltage sampling
The input terminal of unit 62 and temperature detecting unit 63, the input voltage sampling unit 61 is connected with 1 power end of power stage circuit,
The output end of the input voltage sampling unit 61 is connect with the first signal acquisition terminal of compensation circuit 5, and the output voltage is adopted
The input terminal of sample unit 62 is connected with 1 output end of power stage circuit, the output end of the output voltage sampling unit 62 and compensation
The second signal collection terminal of circuit 5 connects, the output end of the temperature detecting unit 63 and the third signal acquisition of compensation circuit 5
End is connected.
In the first embodiment, the power stage circuit 1 include main switch M1, continued flow switch pipe M2, inductance L1 and
Capacitor C1, wherein main switch M1 and continued flow switch pipe M2 is field effect transistor.
Wherein, one end of the inductance L1 is connected with the power end of power stage circuit 1, the other end respectively with main switch M1
Drain electrode and the source electrode of continued flow switch pipe M2 be connected, the grid of the main switch M1 and the switching power source control circuit 4
It is connected, the source electrode ground connection of the main switch M1, the grid of the continued flow switch pipe M2 is connected with switching power source control circuit, institute
The source electrode for stating continued flow switch pipe M2 is connected with the second input terminal of comparison threshold circuit 2, the drain electrode point of the continued flow switch pipe M2
It is not connected with the third input terminal of one end of capacitor C1, the output end of power stage circuit 1 and comparison threshold circuit 2, the electricity
Hold the other end ground connection of C1；
It preferably, is the actual circuit structure of the input voltage sampling unit 61 in the first embodiment, institute with reference to Fig. 3
Stating input voltage sampling unit 61 includes divider resistance R3, divider resistance R4, resistance R5, operational amplifier U2, the 7th NMOS tube
MN7 and the second pmos type circuit mirror current being made of third PMOS tube MP3 and the 4th PMOS tube MP4, the partial pressure electricity
One end of R3 is hindered as the input terminal of input voltage sampling unit 61 and is linked into the power end of power stage circuit 1, divider resistance
The other end of R3 is connected with the positive input terminal of one end of divider resistance R4 and operation amplifier gas simultaneously, and divider resistance R4's is another
End ground connection, the negative input end of operational amplifier U2 are connected with the source electrode of one end of resistance R5 and the 7th NMOS tube MN7, and operation is put
The output end of big device U2 is connected with the grid of the 7th NMOS tube, wherein the other end ground connection of resistance R5, the drain electrode of the 7th NMOS tube
It is connected to the drain electrode of third PMOS tube MP3, wherein the grid of third PMOS tube MP3 and drain electrode are shorted, third PMOS tube MP3 and the
The source electrode of four PMOS tube MP4 connects power Vcc, while the grid phase of the grid of third PMOS tube MP3 and the 4th PMOS tube MP4
Even, the 4th PMOS tube MP4 drain electrode as input voltage sampling unit 61 output end and adopted with the input voltage of compensation circuit 5
Sample end is connected.
In the present embodiment, the circuit structure of the input voltage sampling unit 61 and output voltage sampling unit 62 is homogeneous
Together, difference is that the input terminal of the output voltage sampling unit 62 is connected with the output end of power stage circuit 1, the output electricity
The output end of pressure sampling unit 62 is connected with the output voltage sampling end of compensation circuit 5.
Operational amplifier U2 and the 7th NMOS tube in the input voltage sampling unit 61 and output voltage sampling unit 62
A feedback network is formed, by the effect of feedback, keeps the positive input terminal of operational amplifier U2 and negative input end voltage equal, thus
Make the voltage of resistance R5Therefore the electric current on resistance R5 isUtilize
Two pmos type circuit mirror currents, make the drain electrode of the 4th PMOS tube as output end
Voltage signal is changed for current signal by the mirror current source, the processing of circuit 5 is facilitated compensating for, makes compensation circuit 5
Circuit structure simplifies, and is conducive to circuit reduction cost.
The temperature detecting unit 63 can be acquired the real-time temperature values of power stage circuit 1 using PTAT current source,
And corresponding current signal is exported to compensation circuit 5 according to real time temperature signal, the temperature detecting unit 63 can also use
NTC thermistor acquire power stage circuit 1 real time temperature, also according to real time temperature signal export corresponding current signal to
Compensation circuit 5.
It preferably, is the circuit structure connection figure of the compensation circuit 5 in the first embodiment with reference to Fig. 4, the compensation electricity
Road 5 include the first pmos type circuit mirror current, the first NMOS type circuit mirror current, the second NMOS type circuit mirror current with
And third NMOS type circuit mirror current, the input terminal of the first pmos type circuit mirror current and the first NMOS type mirror image electricity
The output end of current circuit connects, the output end and simultaneously of the output end of the first pmos type circuit mirror current as compensation circuit 5
Connect the first input end of comparison threshold circuit 2, the output end and third NMOS type mirror of the second NMOS type circuit mirror current
The output end of image current circuit, first signal of the input terminal of the first NMOS type circuit mirror current as compensation circuit 5
Collection terminal is connected with the output end of output voltage sampling unit 62, the input terminal conduct of the second NMOS type circuit mirror current
The third signal acquisition terminal of compensation circuit 5 is connected with the output end of temperature detecting unit 63, the third NMOS type image current
The input terminal of circuit is connected as the second signal collection terminal of compensation circuit 5 with the output end of input voltage sampling unit 61.
In the first embodiment, the first pmos type circuit mirror current uses the first PMOS tube MP1 and the 2nd PMOS
Pipe MP2 forms circuit mirror current, and the first NMOS type circuit mirror current uses the first NMOS tube MN1 and the second NMOS tube
MN2 forms circuit mirror current, and the second NMOS type circuit mirror current uses third NMOS tube MN3 and the 4th NMOS tube
MN4 forms circuit mirror current, and the third NMOS type circuit mirror current uses the 5th NMOS tube MN5 and the 6th NMOS tube
MN6 forms circuit mirror current；Wherein the grid of the first PMOS tube MP1 and drain electrode are shorted, the source electrode of the first PMOS tube MP1 and the
The source electrode of two PMOS tube MP2 connects power Vcc, while the grid phase of the grid of the first PMOS tube MP1 and the second PMOS tube MP2
Even, the second PMOS tube MP2 drain electrode as supplementary circuitry output end and with the drain electrode of the 4th NMOS tube MN4 and the 6th NMOS
The drain electrode of pipe MN6 is connected, and the source electrode of the first PMOS tube MP1 is connected with the drain electrode of the second NMOS tube MN2；First NMOS tube MN1's
Grid and drain electrode are shorted, and the grid of the first NMOS tube MN1 is connected with the grid of the second NMOS tube MN2, the leakage of the first NMOS tube MN1
Pole is connected with the output end of output voltage sampling unit 62；The grid of third NMOS tube MN3 and drain electrode are shorted, third NMOS tube
The grid of MN3 is connected with the grid of the 4th NMOS tube MN4, the drain electrode of third NMOS tube MN3 and the output of temperature detecting unit 63
End is connected；The grid of 5th NMOS tube MN5 and drain electrode are shorted, the grid of the 5th NMOS tube MN5 and the grid of the 6th NMOS tube MN6
It is connected, the drain electrode of the 5th NMOS tube MN5 is connected with the output end of input voltage sampling unit 61；The wherein first NMOS tube MN1
Source electrode, the source electrode of the second NMOS tube MN2, the source electrode of third NMOS tube MN3, the source electrode of the 4th NMOS tube MN4, the 5th NMOS tube
The source grounding of the source electrode of MN5 and the 6th NMOS tube MN6.
The working principle of compensation circuit 5 is received the output of output voltage sampling unit 62 by the drain electrode of the first NMOS tube MN1
Current signal Iouts, the drain electrode of third NMOS tube MN3 receives the current signal Iptat of the output of temperature detecting unit 63, the
The drain electrode of five NMOS tube MN5 receives the current signal Iins of the output of input voltage sampling unit 61, utilizes each group mirror image
The principle of current circuit can be such that the output end Icomp=Iouts+Iptat+Iins of compensation circuit 5 compensates for get to one
The real-time input and output voltage signal of power stage circuit 1 and compensation electric current, that is, thermal compensation signal of real time temperature signal, make to compensate
The output end Icomp of circuit 5 changes with the input and output voltage of power stage circuit 1 and the variation of temperature, can offset power
Influence of temperature, input voltage and the output voltage of grade circuit 1 to zero current detection.
It preferably, is the circuit structure connection figure of the comparison threshold circuit 2 in the first embodiment, the ratio with reference to Fig. 5
It include comparison resistance Rcomp and current source, one end and the continued flow switch pipe M2 of the comparison resistance Rcomp compared with threshold circuit 2
Source electrode be connected, the other end as comparison threshold circuit 2 the first output end and respectively with the output end of compensation circuit 5, electric current
The output end in source and the second input terminal of zero cross detection circuit 3 are connected, the second output terminal and mistake of the comparison threshold circuit 2
The first input end of zero detection circuit 3 is connected, and the first output end of the comparison threshold circuit 2 is connected with its first input end,
The second output terminal of the comparison threshold circuit 2 is connected with its third input terminal；It, can be very using simple resistance stacked system
A thresholding, that is, thermal compensation signal in advance is easily superimposed on the voltage differential signal of the source electrode and drain electrode of continued flow switch pipe M2, simultaneously
Very easily the compensation electric current Icomp i.e. thermal compensation signal that compensation circuit 5 exports can also be added to the source of continued flow switch pipe M2
Above the voltage differential signal of pole and drain electrode, i.e., thermal compensation signal and voltage differential signal is overlapped and is sent to comparison threshold circuit 2,
To offset the slope that signal caused by the input and output voltage variation and temperature change of power stage circuit 1 changes over time.
In the present embodiment, the first output end outputting reference signal of the comparison threshold circuit 2, the second output of comparison threshold circuit 2
End output comparison threshold signal.
Output electric current Icomp, that is, thermal compensation signal of compensation circuit 5 can also be conveyed to zero-crossing comparator U1 simultaneously, by changing
Become the bias current of zero-crossing comparator U1, to change the speed of zero-crossing comparator U1, compensation temperature changes to zero-crossing comparator
The influence of U1 speed.
Preferably, with reference to Fig. 6, in the first embodiment, the switching power source control circuit 4 include signal sampling unit,
Reference voltage source, loop control unit, control logic unit and power switch tube drives unit form, wherein signal sampling list
Member includes divider resistance R1 and divider resistance R2, wherein the output end vo ut1 of one end of divider resistance R1 and zero cross detection circuit 3
It is connected, the other end of divider resistance the R1 input terminal of linkloop modulation circuit and one end of divider resistance R2 simultaneously, partial pressure
The other end of resistance R2 is grounded, and the reference voltage source exports a reference voltage signal and gives loop control unit, the loop
The voltage division signal of signal sampling unit and reference voltage signal are compared by control unit, while by voltage division signal and with reference to electricity
The error amplification for pressing signal, generates loop adjustment signal, and loop adjustment signal is transferred to control logic unit, control logic
Unit exports different control logic signals and sends power switch tube drives unit to according to loop adjustment signal, passes through power
Switch driving stage circuit controls the on or off of main switch M1 and continued flow switch pipe M2 respectively.
With reference to Fig. 7, it is second of embodiment, is that the utility model is applied in one of step-down dc-dc converter
Embodiment, in the present embodiment, since the inductive current change rate of step-down dc-dc converter is only with output voltage phase
It closes, and it is unrelated with input voltage, therefore second of embodiment and the difference of the first embodiment are to eliminate input voltage sampling
Unit, it is only necessary to which the variation and temperature change of 1 output voltage of power stage circuit are sampled；Therefore the sample circuit 6 includes
Input voltage sampling unit 61 and temperature detecting unit 63, the input terminal and power stage circuit of the input voltage sampling unit 61
1 power end is connected, and the output end of the input voltage sampling unit 61 is connect with the first signal acquisition terminal of compensation circuit 5,
The output end of the temperature detecting unit 63 is connected with the third signal acquisition terminal of compensation circuit 5.
Simultaneously the circuit structure connection type and the first embodiment of the power stage circuit 1 in second of embodiment there is also
Difference, the power stage circuit 1 equally includes main switch M1, continued flow switch pipe M2, inductance L1 and capacitor C1, wherein master opens
Closing pipe M1 and continued flow switch pipe M2 is field effect transistor, wherein the source electrode of the main switch M1 and power stage circuit 1
Power end is connected, and the drain electrode of the main switch M1 is connected with one end of the drain electrode of continued flow switch pipe M2 and inductance L1 respectively,
The other end of the inductance L1 is connected with the output end of one end of capacitor C1 and power stage circuit 1 respectively, the capacitor C1's
The grid of other end ground connection, the grid of the main switch M1 and continued flow switch pipe M2 respectively with switching power source control circuit 4
It is connected, the drain electrode of the continued flow switch pipe M2 is connected with the second input terminal of comparison threshold circuit 2, the continued flow switch pipe M2's
Source electrode ground connection is also connected with the third input terminal of comparison threshold circuit 2 simultaneously.
Simultaneously because the source electrode of the continued flow switch pipe M2 of the step-down dc-dc converter in second of embodiment connects on ground
End, the source electrode and drain electrode voltage of continued flow switch pipe M2 is close to zero potential, it is therefore desirable to improve to threshold circuit 2 is compared.Ginseng
Examine Fig. 8, the comparison threshold circuit 2 includes comparison resistance Rcomp and current source, one end of the comparison resistance Rcomp with
The drain electrode of continued flow switch pipe M2 is connected, the other end as comparison threshold circuit 2 the first output end and respectively with compensation circuit 5
The first input end of output end, the output end of current source and zero cross detection circuit 3 is connected, and the of the comparison threshold circuit 2
Two output ends are connected with the second input terminal of zero cross detection circuit 3, the second output terminal and its third of the comparison threshold circuit 2
Input terminal is connected.The compensation circuit 5 is superimposed offset by being injected downwardly into electric current on continued flow switch pipe M2 voltage differential signal
Thermal compensation signal and voltage differential signal are overlapped and are sent to comparison threshold circuit 2 by amount, in the present embodiment, the relatively door
Ration the power supply road 2 the first output end output comparison threshold signal, the second output terminal outputting reference signal of comparison threshold circuit 2.
In second of embodiment, the zero cross detection circuit 3 equally compares processing as thresholding using zero-crossing comparator U1
The non-inverting input terminal of device, the zero-crossing comparator U1 is connected with the first input end of comparison threshold circuit 2, the zero-crossing comparator
The inverting input terminal of U1 is connected with the second output terminal of comparison threshold circuit 2, and the bias current of the zero-crossing comparator U1 is adjusted
Input terminal is connected with the second output terminal of compensation circuit 5, and the zero-crossing comparator U1 is by non-inverting input terminal and inverting input terminal
Input signal is compared and exports comparison signal, and comparison signal is fed back to switching power source control circuit 4.
Simultaneously because without being sampled to the input voltage of power stage circuit 1, with reference to Fig. 9, therefore the compensation circuit 5
Including the first pmos type circuit mirror current, the first NMOS type circuit mirror current and the second NMOS type circuit mirror current,
The input terminal of the first pmos type circuit mirror current is connect with the output end of the first NMOS type circuit mirror current, and first
The output end of pmos type circuit mirror current connects the first input end and the second NMOS type of the comparison threshold circuit 2 simultaneously
The output end of circuit mirror current, first letter of the input terminal of the first NMOS type circuit mirror current as compensation circuit 5
Number collection terminal is connected with the output end of output voltage sampling unit 62, and the input terminal of the second NMOS type circuit mirror current is made
It is connected for the third signal acquisition terminal of compensation circuit 5 with the output end of temperature detecting unit 63.
Wherein the compensation circuit 5 in second of embodiment is identical as structure in the first embodiment, and difference, which is only that, to be lacked
Third NMOS type circuit mirror current, thus in second of embodiment compensation circuit 5 output end Icomp=Iouts+Iptat, i.e.,
The compensation electric current for obtaining the signal of real-time output voltage and real time temperature that one compensates for power stage circuit 1 compensates letter
Number, change the output end Icomp of compensation circuit 5 with the output voltage of power stage circuit 1 and the variation of temperature, can offset
The influence of the temperature of power stage circuit 1 and output voltage to zero current detection.
Switching power source control circuit 4, output voltage sampling unit 62 and temperature detecting unit in second of embodiment
63 can be used circuit structure identical with the first embodiment, principle be also it is identical, according to comparison threshold circuit 2 according to supplement
The compensating current signal of circuit output is superimposed a thresholding in advance on the source electrode and drain electrode voltage differential signal of continued flow switch pipe M2
That is thermal compensation signal, so that the slope that signal caused by output voltage variation and temperature change changes over time is offset, while
The thermal compensation signal that supplementary circuitry 5 exports is transferred to zero-crossing comparator U1, by changing the bias current of zero-crossing comparator U1, from
And change the speed of zero-crossing comparator U1, compensation temperature variation on comparator speed influence, then switching power source control circuit 4 then according to
According to the output signal of zero-crossing comparator U1.To in power stage circuit 1 main switch M1 and continued flow switch pipe M2 carry out conducting or
The control of cut-off then makes continued flow switch pipe M2 when zero passage detection comparator U1 detects that the electric current of continued flow switch pipe M2 is zero
Cut-off.
Preferably, in applied embodiment, if without being sampled to the temperature change of power stage circuit 1, i.e.,
The sample circuit 6 includes input voltage sampling unit 61 and output voltage sampling unit 62, the input voltage sampling unit
61 input terminal is connected with 1 power end of power stage circuit, output end and the compensation circuit 5 of the input voltage sampling unit 61
The connection of first signal acquisition terminal, the input terminal of the output voltage sampling unit 62 is connected with 1 output end of power stage circuit, described
The output end of output voltage sampling unit 62 is connect with the second signal collection terminal of compensation circuit 5.
Then there are also the structure charts of the third embodiment for the compensation circuit 5, and with reference to Figure 10, then the compensation circuit 5 is wrapped
Include the first pmos type circuit mirror current, the first NMOS type circuit mirror current and third NMOS type circuit mirror current, institute
The input terminal for stating the first pmos type circuit mirror current is connect with the output end of the first NMOS type circuit mirror current, the first PMOS
The output end of type circuit mirror current connects the first input end and third NMOS type mirror image of the comparison threshold circuit 2 simultaneously
The output end of current circuit, the output of the input terminal and output voltage sampling unit 62 of the first NMOS type circuit mirror current
End is connected, and the input terminal of the third NMOS type circuit mirror current is connected with the output end of input voltage sampling unit 61.Its
Circuit structure is identical as the compensation circuit 5 in the first embodiment, and difference, which is only that, lacks the second NMOS type circuit mirror current
Structure, i.e., without sampled power grade circuit 1 temperature change current signal, then compensation circuit 5 export electric current Icomp=
Iouts+Iins to get real-time input and output voltage and real time temperature that power stage circuit 1 is compensated for one signal
Electric current, that is, thermal compensation signal is compensated, makes the output end Icomp of compensation circuit 5 with the variation of the input and output voltage of power stage circuit 1
And change, can offset power stage circuit 1 input voltage and output voltage to zero current detection influence.The electricity of other circuits
Line structure can also be according to actually improving, but its principle is similar with the first embodiment.
Preferably, if the input voltage variation of power stage circuit 1 is little, it may not be necessary to acquire the input electricity of power stage circuit 1
Signal is pressed, then the sample circuit 6 includes output voltage sampling unit 62 and temperature detecting unit 63, the output voltage sampling
The input terminal of unit 62 is connected with 1 output end of power stage circuit, the output end and compensation electricity of the output voltage sampling unit 62
The second signal collection terminal on road 5 connects, the output end of the temperature detecting unit 63 and the third signal acquisition terminal of compensation circuit 5
It is connected.And compensation circuit 5 then based on current mirror principle acquisition output voltage sampling unit 62 and temperature detecting unit 63 electricity
Signal is flowed, and is overlapped, then exports superimposed thermal compensation signal to comparison threshold circuit 2 and zero cross detection circuit 3.
Preferably, power stage circuit 1 can only change in input voltage, then the sample circuit 6 includes input voltage
The input terminal of sampling unit 61, the input voltage sampling unit 61 is connected with 1 power end of power stage circuit, the input voltage
The output end of sampling unit 61 is connect with the first signal acquisition terminal of compensation circuit 5, while compensation circuit 5 also only needs acquisition to input
The signal of voltage sampling unit 61.
Preferably, power stage circuit 1 can only change in output voltage, then the sample circuit 6 includes output voltage
The input terminal of sampling unit 62, the output voltage sampling unit 62 is connected with 1 output end of power stage circuit, the output voltage
The output end of sampling unit 62 is connect with the second signal collection terminal of compensation circuit 5, while compensation circuit 5 also only needs acquisition to export
The signal of voltage sampling unit 62.
Preferably, power stage circuit 1 can only change in temperature, then the sample circuit 6 includes temperature detection list
Member 63, the output end of the temperature detecting unit 63 is connected with the third signal acquisition terminal of compensation circuit 5, while compensation circuit 5
Also the signal of temperature collection detection unit 63 is only needed.
The above, the only better embodiment of the utility model, but the utility model is not limited to above-mentioned reality
Example is applied, as long as its technical effect for reaching the utility model with any same or similar means, all should belong to the utility model
Protection scope.
Claims (9)
1. a kind of zero current detection and regulating system, it is characterised in that: including sequentially connected power stage circuit (1), compare door
Ration the power supply road (2), zero cross detection circuit (3) and switching power source control circuit (4), the switching power source control circuit (4) also with
Power stage circuit (1) connection, the comparison threshold circuit (2) are also connected with compensation circuit (5), and the compensation circuit (5) also connects
Be connected to sample circuit, the sample circuit (6) be used to acquire power stage circuit (1) input voltage and/or output voltage and/or
The signal of temperature.
2. zero current detection according to claim 1 and regulating system, it is characterised in that: the compensation circuit (5) also with
Zero cross detection circuit (3) is connected, for changing the bias current of zero cross detection circuit (3).
3. zero current detection according to claim 1 and regulating system, it is characterised in that: the sample circuit (6) includes
Input voltage sampling unit (61), output voltage sampling unit (62) and temperature detecting unit (63), the input voltage sampling
The input terminal of unit (61) is connected with power stage circuit (1) power end, the output end of the input voltage sampling unit (61) with
First signal acquisition terminal of compensation circuit (5) connects, the input terminal and power stage circuit of the output voltage sampling unit (62)
(1) output end is connected, and the output end of the output voltage sampling unit (62) and the second signal collection terminal of compensation circuit (5) connect
It connects, the output end of the temperature detecting unit (63) is connected with the third signal acquisition terminal of compensation circuit (5).
4. zero current detection according to claim 1 and regulating system, it is characterised in that: the sample circuit (6) includes
Input voltage sampling unit (61) and temperature detecting unit (63), the input terminal and power of the input voltage sampling unit (61)
Grade circuit (1) power end is connected, and the output end of the input voltage sampling unit (61) and the first signal of compensation circuit (5) are adopted
Collect end connection, the output end of the temperature detecting unit (63) is connected with the third signal acquisition terminal of compensation circuit (5).
5. zero current detection according to claim 1 and regulating system, it is characterised in that: the sample circuit (6) includes
Output voltage sampling unit (62) and temperature detecting unit (63), the input terminal and power of the output voltage sampling unit (62)
Grade circuit (1) output end is connected, and the output end of the output voltage sampling unit (62) and the second signal of compensation circuit (5) are adopted
Collect end connection, the output end of the temperature detecting unit (63) is connected with the third signal acquisition terminal of compensation circuit (5).
6. zero current detection according to claim 1 and regulating system, it is characterised in that: the sample circuit (6) includes
Input voltage sampling unit (61) and output voltage sampling unit (62), the input terminal of the input voltage sampling unit (61) with
Power stage circuit (1) power end is connected, the output end of the input voltage sampling unit (61) and first letter of compensation circuit (5)
The connection of number collection terminal, the input terminal of the output voltage sampling unit (62) is connected with power stage circuit (1) output end, described defeated
The output end of voltage sampling unit (62) is connect with the second signal collection terminal of compensation circuit (5) out.
7. zero current detection according to claim 1 and regulating system, it is characterised in that: the sample circuit (6) includes
Input voltage sampling unit (61), input terminal and power stage circuit (1) the power end phase of the input voltage sampling unit (61)
Even, the output end of the input voltage sampling unit (61) is connect with the first signal acquisition terminal of compensation circuit (5).
8. zero current detection according to claim 1 and regulating system, it is characterised in that: the sample circuit (6) includes
Output voltage sampling unit (62), input terminal and power stage circuit (1) the output end phase of the output voltage sampling unit (62)
Even, the output end of the output voltage sampling unit (62) is connect with the second signal collection terminal of compensation circuit (5).
9. zero current detection according to claim 1 and regulating system, it is characterised in that: the sample circuit (6) includes
Temperature detecting unit (63), the output end and the third signal acquisition terminal phase of compensation circuit (5) of the temperature detecting unit (63)
Even.
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| CN201821983630.5U CN209001807U (en) | 2018-11-28 | 2018-11-28 | A kind of zero current detection and regulating system |
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| CN201821983630.5U CN209001807U (en) | 2018-11-28 | 2018-11-28 | A kind of zero current detection and regulating system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109347309A (en) * | 2018-11-28 | 2019-02-15 | 珠海智融科技有限公司 | A kind of method and system of zero current detection and adjusting |
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2018
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109347309A (en) * | 2018-11-28 | 2019-02-15 | 珠海智融科技有限公司 | A kind of method and system of zero current detection and adjusting |
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Address after: 519000 room 1401-1405, building 4, No. 101, University Road, Tangjiawan Town, Xiangzhou District, Zhuhai City, Guangdong Province Patentee after: Zhuhai Zhirong Technology Co.,Ltd. Address before: 519000 a401, Tsinghua Science Park, No. 101, University Road, Tangjiawan, high tech Zone, Zhuhai, Guangdong Patentee before: ZHUHAI SMART WARE TECHNOLOGY CO.,LTD. |
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