CN109031089A - Synchronous rectification chip and its automatic detection circuit of power supply, automatic testing method - Google Patents
Synchronous rectification chip and its automatic detection circuit of power supply, automatic testing method Download PDFInfo
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- G—PHYSICS
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- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
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Abstract
The invention belongs to circuit detection technique fields, provide a kind of automatic testing method of automatic detection circuit, synchronous rectification chip and synchronous rectification chip exterior power supply applied to the power supply of synchronous rectification chip exterior；The automatic detection circuit includes: pulse power supply module, first voltage detection module, pull-down current module and powering mode judgment module；When driving signal is the first level state, VD pulse is transmitted to VCC power pin by pulse power supply module；First voltage detection module generates first voltage according to the voltage of VCC power pin and the difference of the first reference voltage and detects signal；When VCC power pin accesses pull-down current, powering mode judgment module judges which kind of powering mode synchronous rectification chip is according to the decline of the voltage of VCC power pin or rising situation；It can solve the problems, such as which kind of external power supply connection type synchronous rectification chip can not detect itself using automatically in traditional technology through the invention.
Description
Technical field
The invention belongs to circuit detection technique field more particularly to it is a kind of applied to synchronous rectification chip exterior power supply from
The automatic testing method of dynamic detection circuit, synchronous rectification chip and the power supply of synchronous rectification chip exterior.
Background technique
Since synchronous rectification chip can play good rectification effect, technical staff in the design of electronic circuit
Synchronous rectification chip is applied in various electronic equipments, such as mobile phone, laptop etc.；Synchronous rectification chip includes
VD power input pin and VCC power pin, in traditional circuit topological structure, by synchronous rectification chip apply synchronize it is whole
When in current circuit, synchronous rectification chip can be by VD power input pin to VCC power pin voltage pulse output, by this
Pulse voltage is realized to VCC power pin and is powered；It can also be by the directly external external electrical of the VCC power pin of synchronous rectification chip
Source, and then external power supply is directly realized to VCC power pin and is powered.
Therefore, in traditional synchronous rectification chip exterior power supply mode, the VCC power pin of synchronous rectification chip exists
Two kinds of external power supply modes use different external power supply connection types according to synchronous rectification chip, then synchronous rectification core
The power supply that the VCC power pin of piece is accessed is not also identical, correspondingly, the VCC power pin of synchronous rectification chip just needs outside
Connect different electric power components；However in practical applications, when technical staff applies synchronous rectification chip in synchronous rectification electricity
When in road, synchronous rectification chip can not detect which kind of external power supply mode synchronous rectification chip uses on earth at this time automatically,
And then the compatibility of the synchronous rectification chip is caused to reduce, it can not be universally applied in different types of rectification circuit.
Summary of the invention
The present invention provide it is a kind of applied to synchronous rectification chip exterior power supply automatic detection circuit, synchronous rectification chip and
The automatic testing method of synchronous rectification chip exterior power supply, it is intended to which solving synchronous rectification chip existing in the prior art can not be certainly
It is dynamic to detect which kind of external power supply connection type itself uses, and then lead to compatibility and the lower problem of practicability.
First aspect present invention provides a kind of automatic detection circuit applied to the power supply of synchronous rectification chip exterior, described same
Walking rectification chip includes: VCC power pin and the VD power input pin for accessing VD pulse, the automatic detection circuit packet
It includes:
It is connected between the VD power input pin and the VCC power pin, is configured to the driving signal in access
When for the first level state, pulse power supply module from the VD pulse to the VCC power pin that be powered by；
It is connect with the VCC power pin, is configured to detect the voltage of the VCC power pin, and according to the VCC electricity
The difference of the voltage of source capsule foot and the first reference voltage generates the first voltage detection module of first voltage detection signal；Wherein when
It is first that the voltage of the VCC power pin, which is more than or equal to first voltage detection signal when first reference voltage,
Level state；
It connect, is configured to according to when the first voltage with the first voltage detection module and the VCC power pin
Detect the pull-down current module for exporting pull-down current when signal is the first level state to the VCC power pin；
With the pulse power supply module be electrically connected, and with the first voltage detection module and the pull-down current mould
Block is of coupled connections, and is configured to generate the driving signal, and when the VCC power pin accesses the pull-down current, root
Judge that the synchronous rectification chip is in the first power supply mould according to the down or up situation of the voltage of the VCC power pin
The powering mode judgment module of formula or the second powering mode；Wherein, the first voltage detection signal is the first level state
Driving signal described in Shi Ze is second electrical level state.
Second aspect of the present invention provides a kind of synchronous rectification chip, wherein the synchronous rectification chip includes: VCC power supply pipe
Foot, VD power input pin, ground pin and rectified signal output pin, the synchronous rectification chip further include as described above
Be applied to synchronous rectification chip exterior power supply automatic detection circuit.
Third aspect present invention provides a kind of automatic testing method of synchronous rectification chip exterior power supply, the synchronous rectification
Chip includes: VCC power pin and the VD power input pin for accessing VD pulse, and the automatic testing method includes:
When accessing the driving signal of the first level state, it is powered by the VD pulse to the VCC power pin；
Detect the voltage of the VCC power pin, and according to the voltage of the VCC power pin and the first reference voltage
Difference generates first voltage and detects signal；Wherein when the voltage of the VCC power pin is more than or equal to first reference
The first voltage detection signal is the first level state when voltage；
When first voltage detection signal is the first level state, pull-down current is exported to the VCC power pin；
The VCC power pin access the pull-down current when, according to the voltage of the VCC power pin decline or on
Situation is risen to judge that the synchronous rectification chip is in the first powering mode or the second powering mode；Wherein, described first
Then the driving signal is second electrical level state when voltage detection signal is the first level state.
In the above-mentioned automatic detection circuit applied to the power supply of synchronous rectification chip exterior, when driving signal is the first level
When state, VD pulse is transmitted to VCC power pin by pulse power supply module, is initially powered with realizing to VCC power pin；
As VD pulse is constantly transmitted to VCC power pin by pulse power supply module, the voltage of VCC power pin rises, the first electricity
Pressure detection signal jump is the first level state, and driving signal jump is second electrical level state, and pulse power supply module stops at this time
VD pulse is exported to VCC power pin, and pull-down current is transmitted to VCC power pin by pull-down current module, drop-down electricity
Stream has the function of inhibition for the voltage of VCC power pin and reduces that powering mode judgment module can be according to VCC power pin
Voltage rise or fall situation judge synchronous rectification chip be in which kind of powering mode, it is whole for synchronizing to realize
Flow the automatic detection and identification of the external power supply connection of chip；It can not be automatic to solve synchronous rectification chip in traditional technology
Detect which kind of external power supply connection type itself uses, the problem for causing its compatibility lower.
Detailed description of the invention
Fig. 1 is that synchronous rectification chip provided in an embodiment of the present invention shows in different powering mode lower outer portions for electric connection structure
It is intended to；
Fig. 2 is a kind of automatic detection circuit applied to the power supply of synchronous rectification chip exterior provided in an embodiment of the present invention
Function structure chart；
Fig. 3 is another automatic detection circuit for being applied to the power supply of synchronous rectification chip exterior provided in an embodiment of the present invention
Function structure chart；
Fig. 4 is a kind of automatic detection circuit applied to the power supply of synchronous rectification chip exterior provided in an embodiment of the present invention
Circuit structure diagram；
Fig. 5 be it is provided in an embodiment of the present invention under the first powering mode in automatic detection circuit each signal waveform
Figure；
Fig. 6 be it is provided in an embodiment of the present invention under the second powering mode in automatic detection circuit each signal waveform
Figure；
Fig. 7 is a kind of function structure chart of synchronous rectification chip provided in an embodiment of the present invention；
Fig. 8 is a kind of specific stream of the automatic testing method of synchronous rectification chip exterior power supply provided in an embodiment of the present invention
Cheng Tu.
Specific embodiment
Synchronous rectification chip can be applied to various rectification circuits as functional chip common in a kind of traditional technology
In；Related technical personnel successively have developed various types of rectification chips, as DK5V45R25, IR1166S, SOT23-5 with
And SOT23-6 etc.；Signified synchronous rectification chip includes the rectification chip of all models in traditional technology in the present invention；Traditional skill
Although the rectification chip of different model has a certain difference in the function and structure of pin in art, all models it is same
Walking rectification chip necessarily includes VCC power pin and VD power input pin, and is being worked on power in synchronous rectification chip
Cheng Zhong, the VCC power pin of synchronous rectification chip is necessarily required to access electric energy, so that synchronous rectification chip can be realized normally
Circuit function；Therefore automatic detection circuit disclosed in this invention is applicable among the synchronous rectification chip of all models, real
Referring now to the automatic detection of the external power supply connection type of synchronous rectification chip.
According to the basic electronics common sense of the art, synchronous rectification chip includes VCC power pin and VD power input
Pin, when applying the synchronous rectification chip in circuit of synchronous rectification, there are one for the VCC power pin of synchronous rectification chip
A charging process, but in actual application, since the external power supply connection structure of synchronous rectification chip is not identical, that
VCC power pin just needs external different electronic component under different powering modes, and Fig. 1 shows synchronous rectification core
Piece 200 is in different powering mode lower outer portions power supply attachment structure schematic diagram；Wherein in Fig. 1 (a), synchronous rectification chip 200
VCC power input pin directly with the vice-side winding of transformer, during the work time due to circuit of synchronous rectification, the pair of transformer
Side winding can export stable electric energy, then outside the VCC power input pin of synchronous rectification chip 200 can be directly accessed at this time
The electric energy in portion is to realize under the external power supply connection type for itself quick charge, shown by Fig. 1 (a), synchronous rectification core
The VCC power input pin of piece 200 is directly accessed external power supply, is not necessarily to external any auxiliary power component, reduces electric energy
Loss, reduces the application cost of the synchronous rectification chip 200, but the chip exterior in Fig. 1 (a) can not for electric connection mode
Suitable for all applications, such as in Fig. 1 (c), due to synchronous rectification chip 200 ground pin 500 directly and transformation
The vice-side winding of device connects, then the ground pin 500 of synchronous rectification chip 200 is directly accessed electric energy, at this point, synchronous rectification chip
200 VCC power pin 300 just can not directly be connect with the vice-side winding of transformer, therefore, the VCC of synchronous rectification chip 200
Power pin 300 is directly accessed the mode of external electric energy, restricted application.
In Fig. 1 (b) and Fig. 1 (c), due to synchronous rectification chip 200 VD power input pin 400 directly and transformer
Vice-side winding connection, then by VD power input pin 400 i.e. can access VD pulse, at this time by the VD pulse can be real
Now power to VCC power pin 300, under the power supply mode of Fig. 1 (b) and Fig. 1 (c), the VCC power supply of synchronous rectification chip 200
Pin 300 is not directly accessed external power supply, and VCC power pin 300 connects external power supply by a decoupling capacitance 600 and returns
Road, the VCC power pin 300 of synchronous rectification chip 200 accesses electric energy by VD pulse at this time, to realize its own charging；
So in the external power supply connection type shown by Fig. 1 (b) and Fig. 1 (c), synchronous rectification chip 200 is applicable to inhomogeneity
In the circuit of synchronous rectification of type, compatibility is strong, applied widely；But external power supply shown in Fig. 1 (b) and Fig. 1 (c) connects
It connects in mode, since the VCC power pin 300 of synchronous rectification chip 200 needs an external decoupling capacitance 600, and then leads to this
The manufacturing cost of circuit of synchronous rectification is got higher, and the electric energy loss of synchronous rectification chip 200 is bigger；Therefore, in rectification circuit
During designing and manufacturing, technical staff can take different external power supplies to connect synchronous rectification chip 200 according to actual needs
Mode is connect, such as Fig. 1 (a), Fig. 1 (b) and Fig. 1 (c), but when synchronous rectification chip 200 is connected using different external power supplies
When mode, synchronous rectification chip 200 can not detect which kind of powering mode is VCC power pin 300 at this time use automatically, and then lead
Causing the compatibility of the synchronous rectification chip 200 reduces.
Fig. 2 shows the automatic detection electricity provided in an embodiment of the present invention applied to 200 external power supply of synchronous rectification chip
The modular structure on road 100, for ease of description, only parts related to embodiments of the present invention are shown, as described in Figure 2, should be certainly
Dynamic detection circuit 100 is for being detected and being identified automatically to the external power supply connection type of synchronous rectification chip 200, institute as above
It states, the synchronous rectification chip 200 includes VCC power pin 300 and VD power input pin 400；Specifically, the present invention is implemented
The structural schematic diagram of synchronous rectification chip can refer to Fig. 1 in example, when synchronous rectification chip is applied in electronic circuit, VD power supply
Input pin 400 constantly accesses VD pulse, can provide electric energy to VCC power pin 300 by VD pulse, wherein VD pulse has
There are specific frequency and period；When the VCC power pin 300 of synchronous rectification chip reaches stable work by initial charging
When voltage, which could be in normal working condition.
Automatic detection circuit 100 includes: pulse power supply module 10, first voltage detection module 20, pull-down current module 30
And powering mode judgment module 40；Pulse power supply module 10 connect VD power input pin 400 and VCC power pin 300 it
Between, and pulse power supply module 10 accesses driving signal DisableVD, when driving signal DisableVD is the first level state
When, pulse power supply module 10 is powered by VD pulse to VCC power pin 300, specifically, passing through driving signal
DisableVD can control conducting or the off state of pulse power supply module 10, only when driving signal DisableVD is first
When level state, pulse power supply module 10 can be just connected, and VD pulse can be just transmitted to VCC power supply by VD power input pin 400
Pin 300, and then be powered to VCC power pin 300；If opposite driving signal DisableVD is second electrical level state, that
Pulse power supply module 10 turns off, and VD pulse can't be transmitted to VCC power pin by VD power input pin 400 at this time
300；It should be noted that the driving signal DisableVD is the first level state either high level state can also be with
It is low level state, without limitation, those skilled in the art can have according to the specific application circuit of synchronous rectification chip
The first level state of body setting driving signal DisableVD；In embodiments of the present invention, the of driving signal DisableVD
One level state is low level state, i.e., only when driving signal DisableVD is low level state, VD power input pin
400 can just be transmitted to VD pulse VCC power pin 300.
First voltage detection module 20 is connect with VCC power pin 300, and first voltage detection module 20 detects VCC power supply
The voltage of pin 300, and first voltage detection module 20 is according to the voltage of VCC power pin 300 and the first reference voltage
Difference generates first voltage and detects signal D1, detects the level state of signal D1 by first voltage to measure VCC power pin
Size relation between 300 voltage and the first reference voltage, wherein when the voltage of VCC power pin 300 is greater than the first reference
When voltage, it is the first level state that first voltage, which detects signal D1,；If the voltage of VCC power pin 300 is less than or equal to the
When one reference reference voltage, it is second electrical level state that first voltage, which detects signal D1,；It should be noted that the first reference voltage is
The intrinsic parameter of the system of first voltage detection module 20, the amplitude of the first reference voltage are by the electricity of first voltage detection module 20
Line structure is determined；The first voltage detection signal D1 is that the first level state can refer to high level state, can also
To refer to low level state, herein without limitation, those skilled in the art can set first voltage detection letter according to actual needs
The level state of number D1；In embodiments of the present invention, first voltage detection signal D1 is that the first level state refers to high level shape
State, i.e. D1=1, first voltage detection signal D1 are that second electrical level state refers to low level state, i.e. D1=0.
Pull-down current module 30 is connect with first voltage detection module 20 and VCC power pin 300, first voltage detection
First voltage detection signal D1 is transmitted to pull-down current module 30 by module 20, when first voltage detection signal D1 is the first level
When state, pull-down current module 30 exports pull-down current to VCC power pin 300, and wherein the pull-down current is for making VCC power supply
The voltage of pin 300 declines；Specifically, in conjunction with discussed above, by first voltage detection module 20 to VCC power pin 300
Voltage detected, if the voltage of VCC power pin 300 be greater than the first reference voltage, first voltage detection signal D1 be
First level state, VCC power pin 300 accesses pull-down current at this time, can make VCC power pin 300 by the pull-down current
Voltage present certain amplitude decline, wherein the amplitude of pull-down current be set in advance, such as pull-down current amplitude be 20
Milliampere；Therefore only when the voltage of VCC power pin 300 is greater than the first reference voltage, pull-down current module 30 will pull down electricity
It is streamed to VCC power pin 300, if the VCC power pin 300 uses different powering modes, such as attached drawing 1 (a), attached drawing 1 (b)
And attached drawing 1 (c), under different powering modes, when VCC power pin 300 accesses pull-down current, 300 electricity of VCC power pin
The situation of change of pressure is not also identical, therefore can rise or decline situation by the voltage of VCC power pin 300 to judge VCC
Which kind of powering mode is power pin 300 specifically use.
Powering mode judgment module 40 and pulse power supply module 10 are electrically connected, and powering mode judgment module 40 and the
One voltage detection module 20 and pull-down current module 30 are of coupled connections, and powering mode judgment module 40 generates driving signal
DisableVD controls the conducting or shutdown of pulse power supply module 10 by the level state of driving signal DisableVD；
Specifically, driving signal DisableVD is second electrical level state when first voltage detection signal D1 is the first level state,
Pulse power supply module 10 disconnects at this time, and VCC power pin 300 can't access VD pulse；On the contrary, when first voltage detects signal
When D1 is second electrical level state, driving signal DisableVD is the first level state, and VCC power pin 300 will access VD arteries and veins
Punching, and then be powered by VD pulse to VCC power pin 300；Further, according to the module of automatic detection circuit 100
Structure, when the voltage of VCC power pin 300 is greater than the first reference voltage, it is the first level shape that first voltage, which detects signal D1,
State, driving signal DisableVD is second electrical level state, although synchronous rectification chip is continued by VD power input pin 400
VD pulse is accessed, but since pulse power supply module 10 at this time disconnects, VCC power pin 300 can't access VD pulse, at this time
Pull-down current is transmitted to VCC power pin 300 by pull-down current module 30, and powering mode judgment module 40 is according to VCC power supply pipe
The voltage of foot 300 decline when accessing pull-down current or ascensionist situation come judge synchronous rectification chip be in first power supply mould
Formula or the second powering mode；Since synchronous rectification chip can use different external power supply connection types；So when VCC electricity
When source capsule foot 300 accesses pull-down current, the situation of change of the voltage of VCC power pin 300 within a certain period of time is not also identical, because
This can be by VCC power pin 300 when accessing pull-down current, and the down or up situation of the voltage of VCC power pin 300 is come
Accurately judge that synchronous rectification chip is in the first powering mode or the second powering mode.
It should be noted that in embodiments of the present invention, the first powering mode refers to the VCC power supply pipe of synchronous rectification chip
Foot 300 is powered by VD pulse, at this point, VCC power pin 300 is needed by a decoupling capacitance and circuit of synchronous rectification
Current supply circuit connection, VCC power pin 300 can't be directly accessed external power supply, as shown in attached drawing 1 (b) and attached drawing 1 (c)；
Second powering mode refers to that the VCC power pin 300 of synchronous rectification chip directly connects with the current supply circuit in circuit of synchronous rectification
It connects, VCC power pin 300 can be directly accessed external power supply at this time, as shown in attached drawing 1 (a).
As a preferred embodiment, in above-mentioned powering mode judgment module 40, powering mode judgment module 40
It generates and output mode judges signal ModeDone, can be judged by the level state of mode decision signal ModeDone:
Whether automatic detection circuit 100 completes powering mode deterministic process to synchronous rectification chip.
In embodiments of the present invention, if first voltage detection signal D1 is the first level state, driving signal
DisableVD is jumped to second electrical level state, and pulse power supply module 10 disconnects at this time, and VCC power pin 300 stops access VD arteries and veins
Punching, pull-down current is transmitted to VCC power pin 300 by pull-down current module 30, since the pull-down current is to VCC power pin
300 voltage has the function of inhibiting and reducing, therefore powering mode judgment module 40 is according to the voltage of VCC power pin 300
Declining or rise situation when accessing pull-down current can determine whether that synchronous rectification chip is to be in the first powering mode or the
Two powering modes.
In conjunction with attached drawing 1 and attached drawing 2, in the circuit structure of above-mentioned automatic detection circuit 100, when first voltage detection module 20
When detecting that the voltage of VCC power pin 300 is greater than the first reference voltage, the signal D1 of first voltage detection at this time is the first level
State, driving signal DisableVD are jumped to second electrical level state, and pull-down current is transmitted to VCC electricity by pull-down current module 30
Source capsule foot 300, then VCC power pin 300 can have two kinds of variable conditions when accessing pull-down current, specifically:
If the voltage of VCC power pin 300 drops to the first preset value or less and can maintain N number of VD pulse period, that
The voltage of VCC power pin 300 can be made to reduce by pull-down current at this time, and the electricity after the reduction of VCC power pin 300
The first preset value can be always held at hereinafter, then illustrating that VCC power pin 300 is not straight by being pressed in N number of VD pulse period
Access external power supply, i.e. VCC power pin 300 are powered by VD pulse, at this time the VCC electricity of synchronous rectification chip
Source capsule foot 300 connects the current supply circuit of circuit by a decoupling capacitance, as shown in attached drawing 1 (b) and attached drawing 1 (c)；If therefore VCC electricity
When source capsule foot 300 accesses pull-down current, the voltage of VCC power pin 300 drops to the first preset value or less and can maintain N number of
The VD pulse period, then powering mode judgment module 40 can determine that synchronous rectification chip is in the first powering mode accordingly.
On the contrary, the voltage of VCC power pin 300 is in M VD pulse if VCC power pin 300 is when accessing pull-down current
Do not drop to the first preset value after period hereinafter, the voltage of VCC power pin 300 rise after M VD pulse period
To more than the second preset value, wherein the second preset value is greater than first reference voltage, then illustrate at this time: VCC power pin 300
Pull-down current is accessed, which can not be such that the voltage of VCC power pin 300 declines；I.e. VCC power pin 300 is not
It by VD pulse power supply, but is directly powered by external power supply, VCC power pin 300 directly connects with the current supply circuit of circuit
It connects, as shown in attached drawing 1 (a)；If therefore VCC power pin 300 voltage access pull-down current after M VD pulse period not
Drop to the first preset value hereinafter, VCC power pin 300 voltage access pull-down current after M VD pulse period on
The second preset value or more is risen to, then powering mode judgment module 40 can determine that synchronous rectification chip is in the second power supply accordingly
Mode.
It should be noted that N and M are the positive integers being set in advance more than or equal to 1, since each VD pulse has
There is the specific period, the value of N or the value of M are determined according to the particular circuit configurations of synchronous rectification chip；First is pre-
If value and the second preset value are set in advance, the first preset value and the second preset value meet the following conditions simultaneously: first is default
Value is greater than the first reference voltage less than the first reference voltage, the second preset value；To which automatic detection circuit 100 is to synchronous rectification core
Piece external power supply connection type is able to carry out accurate judgement, avoids the occurrence of detection error.
As a preferred embodiment, Fig. 3 show it is provided in an embodiment of the present invention be applied to synchronous rectification chip
Another modular structure of the automatic detection circuit 100 of external power supply, compared to automatic detection circuit 100 illustrated in fig. 2
Modular structure, the automatic detection circuit 100 in Fig. 3 further comprise second voltage detection module 50 and pulse detection counting module
60, wherein second voltage detection module 50 is connect with powering mode judgment module 40 and VCC power pin 300, second voltage
Detection module 50 detects the voltage of VCC power pin 300, and second voltage detection module 50 is according to VCC power pin 300
The difference of voltage and the second reference voltage generates second voltage and detects signal D2, wherein the second reference voltage is greater than first with reference to electricity
Pressure；It should be noted that the second reference voltage is to be set in advance, related technical personnel can be according to the specific of synchronous rectification chip
Model sets the size of the second reference voltage；Powering mode judgment module 40 can detect signal D2 according to second voltage and judge
Whether synchronous rectification chip is in the second powering mode.
In order to illustrate the function that second voltage detection module 50 is realized, is illustrated below by a specific example
The working principle of two voltage detection modules 50, in conjunction with the embodiment of automatic detection circuit 100 in above-mentioned Fig. 2, shown in Fig. 2
In the modular structure of automatic detection circuit 100, powering mode judgment module 40 is according to the voltage of VCC power pin 300 default
Decline or rising situation in the period of a VD pulse can judge that synchronous rectification chip is to be in the first powering mode (such as
Shown in attached drawing 1 (b) and attached drawing 1 (c)) or the second powering mode (such as shown in attached drawing 1 (a))；And go out shown in fig. 3 automatic
In the modular structure of detection circuit 100, when VCC power pin 300 accesses pull-down current, if the voltage of VCC power pin 300
The second reference voltage is risen to from the first reference voltage within the t1 time, and the t1 time is less than the period of default VD pulse,
Then illustrate at this time: although VCC power pin 300 accesses pull-down current, pull-down current can not make VCC power pin 300
Voltage decline, and the voltage of VCC power pin 300 rises to the second reference voltage within the shorter time (t1 time),
It can be concluded that, the VCC power pin 300 of synchronous rectification chip is directly accessed external power supply, and does not need to lead in the case
VD pulse access electric energy is crossed, then synchronous rectification chip is under the second powering mode.
Therefore, in the modular structure of automatic detection circuit 100 out shown in Fig. 3, pass through second voltage detection module 50
The voltage of VCC power pin 300 is detected, powering mode judgment module 40 can detect signal D2 more according to second voltage
Fast detection determines: whether synchronous rectification chip is under the second powering mode；Therefore automatic detection circuit 100 is whole for synchronizing
The external power supply connection type for flowing chip has higher detection efficiency.
As shown in figure 3, pulse detection counting module 60 and VD power input pin 400 and powering mode judgment module 40 connect
It connects, pulse detection counting module 60 detects the quantity of VD pulse, after synchronous rectification chip accesses external power supply, passes through VD power supply
Input pin constantly accesses VD pulse, therefore can detect VD power input pin in real time by pulse detection counting module 60
The quantity of the VD pulse accessed.
As an alternative embodiment, Fig. 4 show it is provided in an embodiment of the present invention be applied to synchronous rectification chip
The circuit structure of the automatic detection circuit 100 of external power supply, as shown in figure 4, pulse detection counting module 60 includes: first resistor
601, first diode 602, the first buffer 603, the first register 604, the second register 606, third register 607,
Four registers 608, the 5th register 609, the 6th register 610 and the first reverser 605.
Wherein, the first termination VD power input pin 400 of first resistor 601, and then VD power input pin 400 is by VD
Pulse is transmitted to pulse detection counting module 60, and the cathode of first diode 602 and the second end of first resistor 601 are connected to altogether
The input terminal of one buffer 603, wherein the first buffer 603 has data buffer storage to VD pulse in pulse detection counting module 60
With the effect of coordination, the plus earth GND, the clock signal input terminal Clk of the first register 604 of first diode 602 and
The clock signal input terminal Clk of three registers 607 is connected to the output end of the first buffer 603, the triggering of the second register 606 altogether
Signal input part D connects VCC power pin 300, and the clock signal input terminal Clk of the second register 606 connects the first reverser 605
Output end, reset signal input terminal Reset, the 5th register 609 of the input terminal of the first reverser 605, third register 607
Reset signal input terminal Reset and the 6th register 610 reset signal input terminal Reset be connected to altogether first voltage detection
Module 20 and pull-down current module 30, the first reset signal input terminal Reset of register 604 and answering for the 4th register 608
Position signal input part Reset is connected to the forward signal output end Q of the second register 606, the trigger signal of the first register 604 altogether
The clock signal input terminal Clk of input terminal D and the 4th register 608 is connected to the reverse signal output end of the first register 604 altogether
QZ, the forward signal output end Q of the 4th register 608 connect powering mode judgment module 40, the trigger signal of third register 607
The clock signal input terminal Clk of input terminal D and the 5th register 609 is connected to the reverse signal output end of third register 607 altogether
QZ, the trigger signal input terminal D of the 5th register 609 and the clock signal input terminal Clk of the 6th register 610 are connected to the 5th altogether
The reverse signal output end QZ of register 609, the trigger signal input terminal D of the 6th register 610 connect VCC power pin 300, the
The forward signal output end Q of six registers 610 connects powering mode judgment module 40.
As shown in figure 4, pulse power supply module 10 includes: charge pump circuit 101, the first CMOS tube 102 and the two or two pole
Pipe 103；Wherein, the voltage input of charge pump circuit 101 terminates powering mode judgment module 40, for accessing driving signal
DisableVD, the voltage output of charge pump circuit 101 terminate the grid of the first CMOS tube 102, the drain electrode of the first CMOS tube 102
VD power input pin 400 is connect, the source electrode of the first CMOS tube connects the anode of the second diode 103, the cathode of the second diode 103
Connect VCC power pin 300.
It should be noted that the charge pump circuit 101 is the existing circuit structure of the art, those skilled in the art
Member can apply the charge pump circuit in traditional technology in above-mentioned pulse power supply module 10, according to charge in traditional technology
The basic circuit structure of pump circuit, charge pump circuit have the function of power storage and constant voltage output；Therefore work as charge pump
When circuit 101 accesses driving signal DisableVD, charge pump circuit 101 is defeated according to the level state of driving signal DisableVD
Different constant voltage out, controlled by the constant voltage conducting between the drain electrode and source electrode of the first CMOS tube 102 or
Shutdown；Specifically, charge pump circuit 101 is according to driving signal when driving signal DisableVD is the first level state
DisableVD exports constant voltage to the grid of the first CMOS tube 102, and the first CMOS tube 102 is connected, at this point, passing through VD electricity
The VD pulse that source input pin 400 accesses passes sequentially through the first CMOS tube 102 and the second diode 103, to reach VCC power supply pipe
Foot 300, and then be powered by VD pulse to VCC power pin 300.
As shown in figure 4, first voltage detection module 20 includes: that the second CMOS tube 203, third CMOS tube 204, second are reversed
Device 202 and second resistance 201；Wherein, the grid of the first end of second resistance 201 and the second CMOS tube 203 connects VCC power supply pipe
Foot 300, the drain electrode of the second CMOS tube 203 and the second end of second resistance 201 are connected to the input terminal of the second reverser 202 altogether, the
The output termination pull-down current module 30 and pulse detection counting module 60 of two reversers 202, the source electrode of the second CMOS tube 203 and
The drain electrode of third CMOS tube 204 is connected to the grid of third CMOS tube 204 altogether, and the source electrode of third CMOS tube 204 is grounded GND.
As shown in figure 5, pull-down current module 30 includes: the 4th CMOS tube 302, the 5th CMOS tube 303, the 6th CMOS tube
304, reference current source 305 and third reverser 301；Wherein, the input termination first voltage of third reverser 301 detects mould
Block 20 and pulse detection counting module 60, the grid of output the 4th CMOS tube 302 of termination of third reverser 301, the 6th CMOS
The drain electrode of pipe 304 connects VCC power pin 300, the drain electrode of the 4th CMOS tube 302, the 5th CMOS tube 303 grid, the 6th CMOS
The drain electrode of the grid of pipe 304 and the 5th CMOS tube 303 is connected to one end of reference current source 305 altogether, reference current source 305 it is another
One termination VCC power pin 300, for pull-down current to be transmitted to VCC power pin 300, wherein reference current source 305 can be defeated
Constant current out, source electrode, the source electrode of the 5th CMOS tube 303 and the source electrode of the 6th CMOS tube 304 of the 4th CMOS tube 302 connect altogether
In ground GND.
As shown in fig. 6, powering mode judgment module 40 include: the 7th register 401, first or door 402 and second or
Door 403；Wherein, the trigger signal input terminal D of the 7th register 401 connects pulse detection counting module 60, the 7th register 401
Forward signal output termination first or door 402 first input end, first or door 402 second input termination pulse detection count
It is automatic that the first input end of module 60, second or door 403, which connects pulse detection counting module 60, second or the output end of door 403,
The mode decision signal output end of detection circuit 100, by the mode decision signal output end can output mode judge signal
ModeDone, second or door 403 the second input terminal and first or the output end of door 402 be connected to pulse power supply module 10 altogether, use
In driving signal DisableVD is transmitted to pulse power supply module 10, supplied by the i.e. controllable pulse of driving signal DisableVD
The conducting or shutdown of electric module 10.
As shown in figure 4, second voltage detection module 50 includes: 3rd resistor 501, the 4th resistance 502 and comparator
503；Wherein, the first termination VCC power pin 300 of 3rd resistor 501, the second end of 3rd resistor 501 and the 4th resistance 502
First end be connected to the non-inverting input terminal of comparator 503 altogether, the second end of the 4th resistance 502 is grounded GND, comparator 503 it is anti-
The output of mutually the second reference voltage Vref of input termination, comparator 503 terminates powering mode judgment module 40；Due to second voltage
It include comparator 60 in detection module 50, when the non-inverting input terminal and inverting input terminal of comparator 60 are respectively connected to second with reference to electricity
Press Vref and VCC power pin 300 voltage, by the voltage for the second reference voltage Vref and VCC power pin 300 into
After going relatively, second voltage can be detected signal D2 and be transmitted to powering mode judgment module 40 by the output end of comparator 60, and
The level state of signal D2 is detected by second voltage to measure the voltage of the second reference voltage Vref and VCC power pin 300
Between size relation.
In order to better illustrate the present invention in embodiment automatic detection circuit 100 working principle, below with reference to Fig. 1-figure
4, by a specific example come specification automatic detection circuit 100 for the external power supply connection type of synchronous rectification chip
Judgment step, it is specific as follows:
1) if the VCC of synchronous rectification chip is powered (attached drawing 1 (b) and attached drawing 1 i.e. in respective figure by VD pulse
(c))；When synchronous rectification chip start-up operation phase, VD pulse is transmitted to VCC power pin by VD power input pin 400
The continuous rising of 300, VCC power pins 300, wherein figure 5 show under the first powering mode in automatic detection circuit 100 it is each
The waveform diagram of a signal；As shown in figure 5, when the voltage of VCC power pin 300 reaches the first reference voltage, such as the first ginseng
Examining voltage is 2 volts, and driving signal DisableVD is jumped (high to second electrical level state by the first level state (low level state)
Level state), VD pulse can't be transmitted to VCC power pin 300, and the first electricity by VD power input pin 400 at this time
Pressure detection signal D1 is jumped by second electrical level state (low level state) to the first level state (high level state), pull-down current
Pull-down current (20 milliamperes) are transmitted to VCC power pin 300 by module 30, since the VCC of synchronous rectification chip passes through VD pulse
It is powered, then the voltage of VCC power pin 300 can be reduced due to access pull-down current, when VCC power pin 300
When voltage drops to fixed value (1.8V), in this example, the first preset value is set in advance as 1.8V, then pull-down current at this time
Pull-down current can't be transmitted to VCC power pin 300 by module 30, if the voltage of VCC power pin 300 is in multiple VD pulses
Period in be maintained at the first preset value hereinafter, so powering mode judgment module 40 can be judged: synchronous rectification core at this time
The VCC power pin 300 of piece uses the first powering mode (i.e. as shown in attached drawing 1 (b) and attached drawing 1 (c)), to detect automatically
Circuit 100 completes the automatic detection for synchronous rectification chip exterior for electric connection mode, mode decision signal ModeDone
It jumps from low level to high level.
2) if the VCC power pin 300 of synchronous rectification chip is directly accessed external power supply to realize power supply (i.e. respective figure
1 (a)), Fig. 6 shows the waveform diagram of each signal in automatic detection circuit 100 under the second powering mode, referring to above-mentioned Fig. 5
The course of work of middle synchronous rectification chip automatic detection circuit 100 under the first powering mode；The second power supply out shown in Fig. 6
Under mode, when pull-down current is transmitted to VCC power pin 300 by pull-down current module 30, the voltage of VCC power pin 300
The voltage that downward trend or even VCC power pin 300 can't be always maintained at because of access pull-down current can rise always；
Therefore when VCC power pin 300 accesses pull-down current, the voltage of VCC power pin 300 can't be in the week of multiple VD pulses
Drop to the first preset value (1.8V) after phase hereinafter, otherwise the voltage of VCC power pin 300 can rise always until second is default
It is worth (3V) or more；To which powering mode judgment module 40 can be according to the voltage of VCC power pin 300 after accessing pull-down current
Situation of change judges the external connection mode of synchronous rectification chip, to realize for the automatic of synchronous rectification chip powering mode
Detection process.
Fig. 7 shows the circuit structure of synchronous rectification chip 70 provided in an embodiment of the present invention, wherein synchronous rectification chip
70 include: VCC power pin 300, VD power input pin 400, ground pin 500, rectified signal output pin 700 and such as
The automatic detection circuit 100 for being applied to the power supply of synchronous rectification chip exterior, according to discussed above, when the synchronous rectification
When chip 70 is applied in circuit of synchronous rectification, automatic detection circuit 100 can automatically detect the outside of synchronous rectification chip 70
For electric connection mode, to realize the charging process of synchronous rectification chip 70, so that synchronous rectification chip 70 is defeated by rectified signal
Pin 700 can normally export rectified signal out, and circuit of synchronous rectification is made to realize corresponding power source conversion function.
Specifically, as shown in fig. 7, synchronous rectification chip 70 further include: shutdown judging unit 701, conducting judging unit
702, the first nor gate 703, the second nor gate 704 and the second buffer 705, wherein shutdown judging unit 701 and conducting are sentenced
Internal circuit functional module of the order member 702 as synchronous rectification chip 70, shutdown judging unit 701 can generate shutdown letter
Number, conducting judging unit 702 generates Continuity signal, and cut-off signals and Continuity signal collectively constitute the rectification of synchronous rectification chip 70
Signal, when the rectified signal output pin 700 of synchronous rectification chip 70 exports Continuity signal or cut-off signals, conducting letter
Number the current supply circuit of rectification circuit can be made to be connected, and the cut-off signals can when rectification circuit current supply circuit shutdown, in turn
It can control whether circuit of synchronous rectification exports constant voltage by Continuity signal and cut-off signals.
It should be noted that in embodiments of the present invention, turning off judging unit 701 and conducting judging unit 702 is all this
Existing circuit structure in the traditional technology of field；Some common on-off signals in traditional technology can be used in those skilled in the art
Generative circuit turns off circuit function possessed by judging unit 701 and conducting judging unit 702 to realize, such as shutdown determines list
Logic gates in traditional technology etc. can be selected in member 701 and conducting judging unit 702.
As shown in fig. 7, in automatic detection circuit 100, pulse power supply module 10, first voltage detection module 20 and under
Sourcing current module 30 is connected to the VCC power pin 300 of synchronous rectification chip 70 altogether, and pulse power supply module 10 connects VD power input pipe
Foot 400；Wherein (including pulse power supply module 10, the first voltage detection of each circuit module in automatic detection circuit 100 in Fig. 7
Module 20 etc.) function and internal circuit configuration can refer to the above-mentioned embodiment about attached drawing 2 into attached drawing 4, herein will not
It repeats again.
The input terminal of the input terminal and conducting judging unit 702 that turn off judging unit 701 is connected to VD power input pin altogether
400, the output of shutdown judging unit 701 terminates the first input end of the first nor gate 703, and the second of the first nor gate 703 is defeated
Enter the output end of the second nor gate 704 of termination, the output end of the first input end of the second nor gate 704 and the first nor gate 703
Be connected to the input terminal of the second buffer 705 altogether, the second buffer 705 for Continuity signal and cut-off signals have data buffer storage and
The effect of synchronous transfer；The output end of second input termination conducting judging unit 702 of the second nor gate 704, the second buffer
705 output terminates rectified signal output pin 700, and synchronous rectification chip 70 passes through the rectified signal output pin 700
Rectified signal is exported, is in different working conditions to control rectification circuit.
In the circuit structure of synchronous rectification chip 70 out shown in Fig. 7, as noted previously, as 10 energy of automatic detection circuit
It is enough to detect that the synchronous rectification chip 70 applies the external power supply connection type in circuit of synchronous rectification automatically, therefore, compared to
Synchronous rectification chip in traditional technology, the synchronous rectification chip 70 in the embodiment of the present invention have preferably compatibility, adapt to
Range is wider, and the usage experience sense of user is more preferably.
Fig. 8 shows the specific stream of the automatic testing method of synchronous rectification chip exterior power supply provided in an embodiment of the present invention
Journey, wherein the synchronous rectification chip includes VCC power pin 300 and VD power input pin 400, wherein VD power input pipe
Foot 400 has access to VD pulse, can be powered to VCC power pin 300 by the VD pulse；It should be noted that in Fig. 8
Automatic testing method it is corresponding with automatic detection circuit 100 in Fig. 2, therefore about each step in automatic testing method in Fig. 8
Rapid detailed embodiment, those skilled in the art can refer to the embodiment of Fig. 2 automatic detection circuit 100, are shown here only
With correlation step of the embodiment of the present invention, specifically, the automatic testing method includes the following steps:
Step S801: when the driving signal DisableVD of the first level state of access, by VD pulse to VCC power supply pipe
Foot 300 is powered.
Step S802: the voltage of detection VCC power pin 300, and joined according to the voltage of VCC power pin 300 and first
The difference for examining voltage generates first voltage detection signal D1；Wherein when the voltage of VCC power pin 300 is more than or equal to first
First voltage detection signal D1 is the first level state when reference voltage.
Step S803: when first voltage detection signal D1 is the first level state, under being exported to VCC power pin 300
Sourcing current；
Step S804: when VCC power pin 300 accesses pull-down current, declined according to the voltage of VCC power pin 300
Or rise situation to judge that synchronous rectification chip is in the first powering mode or the second powering mode；Wherein, first voltage
Then driving signal DisableVD is second electrical level state when detection signal D1 is the first level state.
Wherein, in step S804, decline or rise situation according to the voltage of VCC power pin 300 to judge to synchronize
Rectification chip is to be in the first powering mode or the second powering mode, specifically:
When the voltage of VCC power pin 300 drops to the first preset value or less and can maintain N number of VD pulse period, really
Determining synchronous rectification chip is in the first powering mode；It is not dropped after the voltage of VCC power pin 300 is in M VD pulse period
As low as the first preset value hereinafter, or when rising to the second preset value or more after M VD pulse period, determining synchronous rectification chip
It is in the second powering mode；Wherein the N and M is the positive integer more than or equal to 1.Therefore shown in fig. 8
In automatic testing method out, synchronous rectification chip can automatically detect that it is external for electric connection mode, have extremely strong
Compatibility and adaptability；It should be noted that, in this document, such as a variety of and multiple etc quantity referred both to greater than 1；Such as
First and second etc relational terms are used merely to distinguish an entity with another entity；In addition, herein,
" being greater than ", " being less than ", " being more than " etc. are interpreted as not including this number；" more than ", " following ", " within " etc. be interpreted as including this number.
Claims (10)
1. a kind of automatic detection circuit applied to the power supply of synchronous rectification chip exterior, the synchronous rectification chip includes: VCC electricity
Source capsule foot and VD power input pin for accessing VD pulse, which is characterized in that the automatic detection circuit includes:
It is connected between the VD power input pin and the VCC power pin, is configured in the driving signal of access be the
When one level state, pulse power supply module from the VD pulse to the VCC power pin that be powered by；
It is connect with the VCC power pin, is configured to detect the voltage of the VCC power pin, and according to the VCC power supply pipe
The difference of the voltage of foot and the first reference voltage generates the first voltage detection module of first voltage detection signal；Wherein when described
It is the first level that the voltage of VCC power pin, which is more than or equal to first voltage detection signal when first reference voltage,
State；
It connect, is configured to according to when the first voltage is detected with the first voltage detection module and the VCC power pin
The pull-down current module of pull-down current is exported when signal is the first level state to the VCC power pin；
With the pulse power supply module be electrically connected, and with the first voltage detection module and the pull-down current module coupling
Connection is closed, is configured to generate the driving signal, and when the VCC power pin accesses the pull-down current, according to institute
State the down or up situation of the voltage of VCC power pin judge the synchronous rectification chip be in the first powering mode or
The powering mode judgment module of the second powering mode of person；Wherein, when the first voltage detection signal is the first level state then
The driving signal is second electrical level state.
2. automatic detection circuit according to claim 1, which is characterized in that the powering mode judgment module is described
When the voltage of VCC power pin drops to the first preset value or less and can maintain N number of VD pulse period, the synchronous rectification is determined
Chip is in the first powering mode；
The powering mode judgment module is not reduced to according to the voltage of the VCC power pin after M VD pulse period
One preset value is hereinafter, or when rising to the second preset value or more after M VD pulse period, determine that the synchronous rectification chip is
In the second powering mode；
Wherein the N and M is the positive integer more than or equal to 1.
3. automatic detection circuit according to claim 2, which is characterized in that further include: with the VD power input pin
And the powering mode judgment module connection, it is configured to detect the pulse detection counting module of the quantity of the VD pulse.
4. automatic detection circuit according to any one of claims 1 to 3, which is characterized in that further include:
It is connect with the powering mode judgment module and the VCC power pin, is configured to detect the electricity of the VCC power pin
Pressure, and the second of second voltage detection signal is generated according to the difference of the voltage of the VCC power pin and the second reference voltage
Voltage detection module；Wherein second reference voltage is greater than first reference voltage.
5. automatic detection circuit according to claim 3, which is characterized in that the pulse detection counting module includes:
One resistance, first diode, the first buffer, the first register, the second register, third register, the 4th register, the 5th
Register, the 6th register and the first reverser；
Wherein the first termination VD power input pin of the first resistor, the cathode of the first diode and described the
The second end of one resistance is connected to the input terminal of first buffer altogether, the plus earth of the first diode, and described first
The clock signal input terminal of the clock signal input terminal of register and the third register is connected to first buffer altogether
Output end, the trigger signal input of second register terminate the VCC power pin, the clock letter of second register
Number input terminates the output end of first reverser, the reset of the input terminal of first reverser, the third register
The reset signal input terminal of signal input part, the reset signal input terminal of the 5th register and the 6th register is total
It is connected to the first voltage detection module and the pull-down current module, the reset signal input terminal of first register and institute
The reset signal input terminal for stating the 4th register is connected to the forward signal output end of second register, first deposit altogether
The clock signal input terminal of the trigger signal input terminal of device and the 4th register is connected to the reversed of first register altogether
Signal output end, the forward signal output of the 4th register terminate the powering mode judgment module, the third deposit
The clock signal input terminal of the trigger signal input terminal of device and the 5th register is connected to the reversed of the third register altogether
Signal output end, the trigger signal input terminal of the 5th register and the clock signal input terminal of the 6th register connect altogether
The VCC power supply is terminated in the trigger signal input of the reverse signal output end of the 5th register, the 6th register
The forward signal output of pin, the 6th register terminates the powering mode judgment module.
6. automatic detection circuit according to claim 1, which is characterized in that the pulse power supply module includes: charge pump
Circuit, the first CMOS tube and the second diode；Wherein, the voltage input of the charge pump circuit terminates the powering mode and sentences
Disconnected module, the voltage output of the charge pump circuit terminate the grid of first CMOS tube, the drain electrode of first CMOS tube
The VD power input pin is connect, the source electrode of first CMOS tube connects the anode of second diode, the two or two pole
The cathode of pipe connects the VCC power pin.
7. a kind of synchronous rectification chip, wherein the synchronous rectification chip includes: VCC power pin, VD power input pin, connects
Ground pin and rectified signal output pin, which is characterized in that the synchronous rectification chip further includes as claim 1-6 is any
The automatic detection circuit for being applied to the power supply of synchronous rectification chip exterior described in.
8. synchronous rectification chip according to claim 7, which is characterized in that the synchronous rectification chip further include: configuration
To generate the shutdown judging unit of cut-off signals, being configured to generate conducting judging unit, the first nor gate, second of Continuity signal
Nor gate and the second buffer；
In the automatic detection circuit, the pulse power supply module, the first voltage detection module and drop-down electricity
Flow module is connected to the VCC power pin altogether, and the pulse power supply module connects the VD power input pin；
The input terminal of the input terminal of the shutdown judging unit and the conducting judging unit is connected to the VD power input pipe altogether
Foot, the first input end of output termination first nor gate of the shutdown judging unit, the second of first nor gate
Input terminates the output end of second nor gate, the first input end of second nor gate and first nor gate it is defeated
Outlet is connected to the input terminal of second buffer altogether, and the second input of second nor gate terminates the conducting judging unit
Output end, the output of second buffer terminates the rectified signal output pin.
9. a kind of automatic testing method of synchronous rectification chip exterior power supply, the synchronous rectification chip includes: VCC power pin
With the VD power input pin for accessing VD pulse, which is characterized in that the automatic testing method includes:
When accessing the driving signal of the first level state, it is powered by the VD pulse to the VCC power pin；
The voltage of the VCC power pin is detected, and according to the difference of the voltage of the VCC power pin and the first reference voltage
It generates first voltage and detects signal；Wherein when the voltage of the VCC power pin is more than or equal to first reference voltage
It is the first level state that Shi Suoshu first voltage, which detects signal,；
When first voltage detection signal is the first level state, pull-down current is exported to the VCC power pin；
When the VCC power pin accesses the pull-down current, according to the down or up feelings of voltage of the VCC power pin
Condition judges that the synchronous rectification chip is in the first powering mode or the second powering mode；Wherein, the first voltage
Then the driving signal is second electrical level state when detection signal is the first level state.
10. automatic testing method according to claim 9, which is characterized in that according under the voltage of the VCC power pin
Drop rises situation to judge that the synchronous rectification chip is in the first powering mode or the second powering mode, specifically
Are as follows:
When the voltage of the VCC power pin drops to the first preset value or less and can maintain N number of VD pulse period, institute is determined
Stating synchronous rectification chip is in the first powering mode；
It is not reduced to the first preset value after the voltage of the VCC power pin is in M VD pulse period hereinafter, or in M VD
When rising to the second preset value or more after the pulse period, determine that the synchronous rectification chip is in the second powering mode；
Wherein the N and M is the positive integer more than or equal to 1.
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| CN112327145A (en) * | 2021-01-04 | 2021-02-05 | 北京紫光青藤微系统有限公司 | Measurement circuit for measuring chip through IO pin |
| CN112327144A (en) * | 2021-01-04 | 2021-02-05 | 北京紫光青藤微系统有限公司 | Measurement circuit for measuring chip through IO pin |
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