CN109901474A - Control system, control circuit and control method - Google Patents
Control system, control circuit and control method Download PDFInfo
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- CN109901474A CN109901474A CN201910219740.7A CN201910219740A CN109901474A CN 109901474 A CN109901474 A CN 109901474A CN 201910219740 A CN201910219740 A CN 201910219740A CN 109901474 A CN109901474 A CN 109901474A
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Abstract
Present invention discloses a kind of control system, control circuit and control method, the control circuit connects chip, and the control circuit includes: connection type identification module, set-up function control module.Link position of the connection type identification module to the setting pin of identification chip, and link position information is fed back into a set-up function control module；Set-up function control module connects the connection type identification module, and the information control chip to be fed back according to the connection type identification module opens set-up function or closes set-up function.Control system, control circuit and control method proposed by the present invention, can be improved the compatibility of the application of chip, make chip according to system application environment it is adaptive open or close X-cap discharging function.
Description
Technical field
The invention belongs to microelectronics technologies, are related to the control system more particularly to a kind of control of chip of a kind of chip
Circuit processed and control method.
Background technique
In some chips, powered before chip normal power supply by control circuit of the HV pin to chip, power supply mode
There are mainly two types of, respectively high voltage startup and X-cap discharge.
In high voltage startup function, before the control system of chip passes through auxiliary winding normal power supply, by HV pin to control
Circuit power supply.
In X- capacitor discharging function, X-cap is connected to AC input, needs to discharge to X-cap when system and AC disconnection
To low value.Here control circuit can be by detecting the variation of the end HV voltage such as whether being flattened smooth detection system and AC by sine wave
Whether disconnect, when the system that detects and AC disconnection, the switching tube conducting inside the HV of high voltage startup end establishes current path for X-
Cap electric discharge.
Fig. 1 is the circuit diagram of the existing chip with high voltage startup and X-CAP discharging function；As shown in Figure 1, before bridge
HV foot is connected to by two rectifier diodes.
Fig. 2 is the circuit diagram of the existing only chip of high voltage startup function；As shown in Fig. 2, the bus directly after bridge
Capacitor Cbus is connected to HV foot, and (Cbus capacitance is greater than X-cap, and X-cap at this time can such as pass through conductive discharge otherwise
Deng the discharge mode compared with power consumption).
At present in use, both the above method cannot be compatible with, i.e. band high voltage startup and X-CAP capacitor discharging function in Fig. 1
Control circuit cannot use Fig. 2 connection type, otherwise X-cap discharging function open (since Cbus capacitance is larger, Vbus voltage
Waveform is flatter), it will discharge bus capacitor always, system operation irregularity.And although Fig. 2 can should be connect using Fig. 1
Method, but more two diodes in Fig. 1, increase the cost of system, but control circuit does not have X-cap electric discharge function at this time
Energy.
In view of this, nowadays there is an urgent need to design a kind of chip control circuit, to overcome existing chip control circuit to deposit
Drawbacks described above.
Summary of the invention
The present invention provides a kind of control circuit and control method, and the compatibility of the application of chip can be improved, make chip according to
System application environment it is adaptive open or close X-cap discharging function.
In order to solve the above technical problems, according to an aspect of the present invention, adopting the following technical scheme that
A kind of control circuit, the control circuit are set in chip, and the control circuit includes:
Connection type identification module, the link position of the setting pin to identification chip, and link position information is anti-
It is fed to a set-up function control module；And
Set-up function control module connects the connection type identification module, to identify mould according to the connection type
The information control chip of block feedback opens set-up function or closes set-up function.
As one embodiment of the present invention, the function of the set-up function control module control is discharging function, institute
Stating set-up function control module is discharging function control module；
The information control chip unlatching that the discharging function control module is fed back according to the connection type identification module is put
Electricity Functional closes discharging function.
As one embodiment of the present invention, the electricity of HV pin of the connection type identification module to obtain chip
Pressure, and identify that HV pin is connected to the rectifier diode before rectifier bridge with this, still it is connected to the bus after rectifier bridge.
As one embodiment of the present invention, the discharging function control module according to the connection type to identify
The result control chip of module identification opens or closes X-CAP discharging function；
If the result of the connection type identification module identification is that HV pin is connected to the rectifier diode before rectifier bridge,
Then discharging function control module control chip opens X-CAP discharging function；
If the result of the connection type identification module identification is that HV pin is connected to the bus after rectifier bridge, discharging function
Control module controls chip and closes X-CAP discharging function.
As one embodiment of the present invention, the connection type identification module meets X-CAP discharging condition in system
When, sample the voltage of HV pin；
The connection type identification module before discharging by comparing and is put to the discharging function inside setting time unlatching
HV voltage change situation after electricity determines the capacitance of HV pin connection capacitor, so that distinguishing HV pin is connected to the first two pole of rectifier bridge
It manages after being still connected to rectifier bridge on bus；
When the HV pin is connected to diode before rectifier bridge, the corresponding capacitor of HV pin is X-CAP capacitor, and is connected to rectification
After bridge when bus, the corresponding capacitor of HV pin is bus Cbus capacitor；The capacitance of X-CAP capacitor is less than the capacitor of Cbus capacitor
Value；
If HV voltage change is greater than given threshold, judge that the corresponding capacitor of HV pin corresponds to the lesser X-CAP of capacitance
Capacitor judges that HV pin is connected to diode before rectifier bridge；
If HV voltage change is less than given threshold, judge that the corresponding capacitor of HV pin corresponds to the biggish Cbus electricity of capacitance
Hold, judges that HV pin is connected to bus after rectifier bridge.
As one embodiment of the present invention, the connection type identification module includes comparison discharge power supply V1, compares
Device U1, switching tube S1, first resistor R1, second resistance R2, first capacitor C1；
The first end of the first resistor R1 connects HV pin, and the second end of first resistor R1 is separately connected second resistance R2
First end, comparator U1 normal phase input end, compare the anode of discharge power supply V1, the cathode of comparison discharge power supply V1 is by opening
The first end that pipe S1 is separately connected the inverting input terminal of comparator U1, first capacitor C1 is closed, the second end of first capacitor C1 is grounded,
The second end of second resistance R2 is grounded.
As one embodiment of the present invention, the comparator U1 is electric by comparing the 2nd HV that normal phase input end inputs
Pressure HV2, inverting input terminal input the first HV voltage HV1 judge that diode is still connected to rectifier bridge before HV pin is connected to rectifier bridge
Afterwards on bus；
If the 2nd HV voltage HV2 voltage is consistently higher than the first HV voltage HV1 in a discharge cycle, then illustrate that HV draws
Capacitance is larger on foot, and the discharging function control module closes X-CAP discharging function, conversely, illustrate on HV pin capacitor compared with
It is small, then it is in the open state to continue to X-CAP discharging function.
As one embodiment of the present invention, the connection type identification module is sentenced by sampling HV pin voltage signal
It is disconnected whether to meet X-CAP discharging condition, when detecting that HV signal the rate of rise does not occur within the set time, determine input AC
Power down meets X-CAP discharging condition.
A kind of control circuit, the control circuit connect chip, and the control circuit includes:
Discharging function control module, after reaching setting number to the HV pin continuous discharge in chip, HV is closed in control
The discharging function of pin.
As one embodiment of the present invention, the discharging function control module includes:
Discharging function closes control unit, and after reaching setting number to the HV pin continuous discharge in chip, control is closed
Close HV pin discharging function；And
Discharging function resets control unit, to reset the discharging function of HV pin after system trigger abnormal protection.
A kind of control system, including above-mentioned control circuit, the setting pin of the control circuit connection chip.
As one embodiment of the present invention, the control system further includes rectifier bridge, first diode D1, the two or two
Pole pipe D2, X-CAP capacitor, Cbus capacitor；
The first end of the rectifier bridge is separately connected the first end of the anode of first diode D1, X-CAP capacitor, rectifier bridge
Second end connection Cbus capacitor first end, the third end of rectifier bridge be separately connected the anode of the second diode D2, X-CAP electricity
The second end of appearance, the second end of Cbus capacitor, the 4th end of rectifier bridge are grounded respectively；The cathode connection second of first diode D1
The cathode of diode D2；The cathode of the HV pin connection first diode D1 of chip.
As one embodiment of the present invention, the control system further includes rectifier bridge, Cbus capacitor；The rectifier bridge
The second end connection first end of Cbus capacitor, chip HV pin；Second end, the 4th end difference of rectifier bridge of Cbus capacitor
Ground connection.
A kind of control method, the control method include:
Connection type identification step, the link position of the setting pin of identification chip；
Set-up function rate-determining steps open setting function according to the information control chip of connection type identification step feedback
It can or close set-up function.
As one embodiment of the present invention, in set-up function rate-determining steps, the function of control is discharging function, setting
Function control step is discharging function rate-determining steps；It is opened according to the information control chip of connection type identification step feedback
It opens discharging function or closes discharging function.
As one embodiment of the present invention, in connection type identification step, the voltage of the HV pin of chip is obtained, and
It identifies that HV pin is connected to the rectifier diode before rectifier bridge with this, is still connected to the bus after rectifier bridge；
In discharging function rate-determining steps, X- is opened or closed according to the result control chip of connection type identification step identification
CAP discharging function:
If the result of connection type identification step identification is that HV pin is connected to the rectifier diode before rectifier bridge, control
Coremaking piece opens X-CAP discharging function；
If the result of connection type identification step identification is that HV pin is connected to the bus after rectifier bridge, chip closing is controlled
X-CAP discharging function.
As one embodiment of the present invention, in connection type identification step, meet X-CAP discharging condition in system
When, sample the voltage of HV pin；Testability opens internal discharging function for a period of time, by comparing before discharging and after discharging
HV voltage change situation determines the capacitance of HV pin connection capacitor, to distinguish before HV pin is connected to rectifier bridge diode still
It is connected to after rectifier bridge on bus；
When the HV pin is connected to diode before rectifier bridge, the corresponding capacitor of HV pin is X-CAP capacitor, and is connected to rectification
After bridge when bus, the corresponding capacitor of HV pin is bus Cbus capacitor；The capacitance of X-CAP capacitor is less than the capacitor of Cbus capacitor
Value；
If HV voltage change is greater than given threshold, judge that the corresponding capacitor of HV pin corresponds to the lesser X-CAP of capacitance
Capacitor judges that HV pin is connected to diode before rectifier bridge；
If HV voltage change is less than given threshold, judge that the corresponding capacitor of HV pin corresponds to the biggish Cbus electricity of capacitance
Hold, judges that HV pin is connected to bus after rectifier bridge.
As one embodiment of the present invention, the connection type identification module is sentenced by sampling HV pin voltage signal
It is disconnected whether to meet X-CAP discharging condition, when detecting that HV signal the rate of rise does not occur within the set time, determine input AC
Power down meets X-CAP discharging condition.
A kind of control method, the control method include: chip setting pin continuous discharge reach setting number after,
The discharging function of setting pin is closed in control.
As one embodiment of the present invention, the control method includes:
Discharging function closes rate-determining steps, and after the HV pin continuous discharge of chip reaches setting number, HV is closed in control
Hereafter pin discharging function is not up to setting condition and is not then turned on discharging function；And
Discharging function resets rate-determining steps, and the discharging function of HV pin is resetted after system trigger abnormal protection.
The beneficial effects of the present invention are: core can be improved in control system, control circuit and control method proposed by the present invention
The compatibility of the application of piece, make chip according to system application environment it is adaptive open or close X-cap discharging function.
Detailed description of the invention
Fig. 1 is the circuit diagram of the existing chip with high voltage startup and X-CAP discharging function.
Fig. 2 is the circuit diagram of the existing only chip of high voltage startup function.
Fig. 3 is the composition schematic diagram of chip control system in one embodiment of the invention.
Fig. 4 is the circuit diagram of the connection type identification module of chip control system in one embodiment of the invention.
Fig. 5 is the waveform diagram of HV pin voltage signal and electric discharge logical signal in one embodiment of the invention.
Specific embodiment
The preferred embodiment that the invention will now be described in detail with reference to the accompanying drawings.
For a further understanding of the present invention, the preferred embodiment of the invention is described below with reference to embodiment, still
It should be appreciated that these descriptions are only further explanation the features and advantages of the present invention, rather than to the claims in the present invention
Limitation.
Just for several typical embodiments, the present invention is not limited merely to the model of embodiment description for the description of the part
It encloses.Some technical characteristics in same or similar prior art means and embodiment, which are replaced mutually, also to be described in the present invention
In the range of protection.
Present invention discloses a kind of control circuit, the control circuit connects chip, and the control circuit includes: connection side
Formula identification module, set-up function control module.Link position of the connection type identification module to the setting pin of identification chip,
And link position information is fed back into the set-up function control module.Set-up function control module connects the connection type and knows
Other module, the information control chip to be fed back according to the connection type identification module open set-up function or close setting function
Energy.
Fig. 3 is the composition schematic diagram of chip control system in one embodiment of the invention；Referring to Fig. 3, of the invention one
In embodiment, the function of the set-up function control module control is discharging function, and the set-up function control module is electric discharge
Functional control module.Control circuit 10 connects chip 20, and control circuit 10 includes: connection type identification module 11, discharging function
Control module 12.The discharging function control module 12 controls chip according to the information that the connection type identification module 11 is fed back
20 open discharging function or close discharging function.In one embodiment of this invention, some or all of control circuit 10 is arranged
In the inside of chip 20；In another embodiment of the invention, control circuit 10 is set to outside chip 20.
In one embodiment of this invention, the electricity of HV pin of the connection type identification module 11 to obtain chip 20
Pressure, and identify that HV pin is connected to the rectifier diode before rectifier bridge with this, still it is connected to the bus after rectifier bridge.
In combination with Fig. 1, Fig. 2, in one embodiment of this invention, the control system includes rectifier bridge D3, the one or two pole
Pipe D1, second diode D2, X-CAP capacitor, Cbus capacitor；Wherein, first diode D1, the second diode D2 can be rectification
Diode.The first end of the rectifier bridge D3 is separately connected the first end of the anode of first diode D1, X-CAP capacitor, rectification
Bridge D3 second end connection Cbus capacitor first end, the third end of rectifier bridge D3 be separately connected the second diode D2 anode,
The second end of X-CAP capacitor, the second end of Cbus capacitor, the 4th end of rectifier bridge D3 are grounded respectively；First diode D1's is negative
Pole connects the cathode of the second diode D2.The second end of the HV pin connection rectifier bridge D3 of chip 20, alternatively, the HV of chip 20 draws
The cathode of foot connection first diode D1.
In one embodiment of this invention, the discharging function control module 12 is to identify mould according to the connection type
The result control chip 20 that block 11 identifies opens or closes X-CAP discharging function: if connection type identification module identification
As a result it is connected to the rectifier diode before rectifier bridge for HV pin, then discharging function control module control chip opens X-CAP
Discharging function；If the result of the connection type identification module identification is that HV pin is connected to the bus after rectifier bridge, discharge function
Energy control module 12 controls chip and closes X-CAP discharging function.
In one embodiment of this invention, the connection type identification module 11 is when system meets X-CAP discharging condition,
Sample the voltage of HV pin.
Fig. 5 is the waveform diagram of HV pin voltage signal and electric discharge logical signal in one embodiment of the invention；It please refers to
Fig. 5, in one embodiment of this invention, the connection type identification module are judged whether completely by sampling HV pin voltage signal
Sufficient X-CAP discharging condition determines input AC power down when detecting that HV signal the rate of rise does not occur within the set time, full
Sufficient X-CAP discharging condition.As shown in figure 5, illustrating that AC input is normal, nothing when HV voltage signal is rectification steamed bun wave signal 501
X- capacitor discharging function need to be opened, when HV voltage signal becomes smooth, illustrates AC input power down, opens X- capacitor electric discharge function
Energy；According to wave characteristics, there are the rates of rise and descending slope for steamed bun wave signal 501, and the descending slope duration will not surpass
Cross the 1/4 of input AC period；And smooth signal 502 is without the rate of rise, therefore when detecting on HV signal do not occur in certain time
When the rate of rise, determines input AC power down, meet X-CAP discharging condition.
The connection type identification module 11 is to the discharging function inside setting time unlatching (in opening to testability
The discharging function setting time in portion), determine that HV pin connects electricity with the HV voltage change situation after electric discharge by comparing before discharging
The capacitance of appearance is still connected to after rectifier bridge on bus to distinguish HV pin and be connected to diode before rectifier bridge.The HV pin
When being connected to diode before rectifier bridge, the corresponding capacitor of HV pin is X-CAP capacitor, and when being connected to bus after rectifier bridge, HV pin
Corresponding capacitor is bus Cbus capacitor；The capacitance of X-CAP capacitor is less than the capacitance of Cbus capacitor.
If HV voltage change is greater than given threshold, discharging function control module 12 judges the corresponding electricity of the corresponding capacitor of HV pin
The lesser X-CAP capacitor of capacitance, judges that HV pin is connected to diode before rectifier bridge；If HV voltage change is less than given threshold, put
Electric work energy control module 12 judges that the corresponding capacitor of HV pin corresponds to the biggish Cbus capacitor of capacitance, and it is whole to judge that HV pin is connected to
Bus after stream bridge.
Fig. 4 is the circuit diagram of the connection type identification module of chip control system in one embodiment of the invention；It please join
Fig. 4 is read, in one embodiment of this invention, the connection type identification module includes comparison discharge power supply V1, comparator U1, opens
Close pipe S1, first resistor R1, second resistance R2, first capacitor C1.The first end connection HV pin of the first resistor R1, first
The second end of resistance R1 is separately connected the first end of second resistance R2, the normal phase input end of comparator U1, comparison discharge power supply V1
Anode, the cathode of comparison discharge power supply V1 is separately connected inverting input terminal, the first capacitor of comparator U1 by switching tube S1
The first end of C1, the second end ground connection of first capacitor C1, the second end ground connection of second resistance R2.
In one embodiment of this invention, the 2nd HV voltage that the comparator U1 is inputted by comparing normal phase input end
HV2, inverting input terminal input the first HV voltage HV1 judge that diode is still connected to rectifier bridge before HV pin is connected to rectifier bridge after
On bus.If the 2nd HV voltage HV2 voltage is consistently higher than the first HV voltage HV1 in a discharge cycle, then illustrate HV pin
Upper capacitance is larger, and the discharging function control module closes X-CAP discharging function, conversely, illustrate that capacitor is smaller on HV pin,
It is in the open state then to continue to X-CAP discharging function.
In one embodiment of this invention, chip can be to rectify two before being connected to bridge by inner setting automatic identification HV pin
Pole pipe is still connected to bus (i.e. increase connection type identification module) after bridge, while according to system connection performance, opening chip pair
Function is answered, if chip determines that HV foot is connected to rectifier diode before bridge, HV has high voltage startup and X-CAP discharging function, if sentencing
Determine HV foot and be connected to bus after bridge, then HV only has high voltage startup function, closes X-CAP discharging function.
In one embodiment of this invention, as shown in figure 4, when system meets X-CAP discharging condition, HV voltage is sampled,
For a period of time, the HV before discharging by comparing and after discharging is electric for discharging function inside the unlatching of connection type identification module testability
It presses situation of change to determine capacitance size on HV foot, is still connected to after bridge on bus to distinguish HV and be connected to diode before bridge, due to
When HV is connected to diode before bridge, the capacitor on HV is X-CAP, and when being connected to bus after bridge, the capacitor on HV is bus capacitor (X-
Cap is smaller, and HV voltage change is big, and Cbus is larger, and HV voltage change is small).And X-CAP is usually 100nf-220nf, it is assumed that X-
Cap capacitor is up to 1uF, and the minimum 10uF of bus capacitor value.Discharge current is 5mA, discharge time 10ms, if to X-
Cap electric discharge, then discharge voltage is dU=5mA*10ms/1uF=50V, if to bus discharge, dU=5mA*10ms/10uF=
5V, therefore set V1=10V in Fig. 4 and if HV2 voltage is consistently higher than HV1 voltage in a discharge cycle then illustrate that HV is powered on
Capacitance is larger, and system closes X-CAP discharging function, conversely, illustrating that capacitor is smaller on HV, then continues the function of X-CAP electric discharge.
Please continue to refer to Fig. 4, HV2 is to sample real-time HV voltage signal, and HV1 is sampling electric discharge initial stage HV voltage signal
Sampling keep signal, when X- capacitor (X-CAP) discharging condition is unsatisfactory for, S1 switching tube is tended to remain on, HV1=HV-
V1 (wherein HV is live signal).When the t0 moment, when X- capacitor meets discharging condition, S1 switching tube is opened, at this time HV1=
HVt0-V1, i.e. record t0 moment HV signal condition；When discharging terminates, if HV Voltage Drop is more than V1, HV2 < HV1,
Comparator U1 exports low level, if otherwise HV Voltage Drop then compares U1 output holding high level less than V1, HV2 > HV1.By
This determines that X- capacitor discharges at this time according to U1 output level, and HV voltage falls degree, determines capacitance size on HV foot with this, from
And distinguish HV and be connected to diode before bridge and be still connected to after bridge on bus, when being connected to diode before bridge due to HV, the capacitor on HV is
X-CAP, and when being connected to bus after bridge, the capacitor on HV is bus capacitor.And X-CAP is usually 100nf-220nf, it is assumed that X-
Cap capacitor is up to 1uF, and the minimum 10uF of bus capacitor value.Discharge current is 5mA, discharge time 10ms, if to X-
Cap electric discharge, then discharge voltage is dU=5mA*10ms/1uF=50V, if to bus discharge, dU=5mA*10ms/10uF=
5V, therefore set V1=10V in Fig. 3 and if HV2 voltage is consistently higher than HV1 voltage in a discharge cycle then illustrate that HV is powered on
Capacitance is larger, and system closes X-CAP discharging function, conversely, illustrating that capacitor is smaller on HV, then continues the function of X-CAP electric discharge.
In one embodiment of this invention, the control circuit connects chip, and the control circuit includes: discharging function control
Molding block, after reaching setting number to the HV pin continuous discharge in chip, the discharging function of HV pin is closed in control.
In one embodiment of this invention, the discharging function control module includes: that discharging function is closed control unit, put
Electric work is capable of resetting control unit.Discharging function closes control unit and reaches setting number to the HV pin continuous discharge in chip
Afterwards, HV pin discharging function is closed in control, is hereafter not up to setting condition and is not then turned on discharging function；Discharging function resets control
Discharging function of the unit to reset HV pin after system trigger abnormal protection.
The present invention also discloses a kind of control system, and including above-mentioned control circuit, the control circuit connection chip is set
Determine pin.
In one embodiment of this invention, the control system further includes rectifier bridge, first diode D1, the second diode
D2, X-CAP capacitor, Cbus capacitor.The first end of the rectifier bridge is separately connected the anode of first diode D1, X-CAP capacitor
First end, rectifier bridge second end connection Cbus capacitor first end, the third end of rectifier bridge is separately connected the second diode
The second end of the anode of D2, X-CAP capacitor, the second end of Cbus capacitor, the 4th end of rectifier bridge are grounded respectively；First diode
The cathode of D1 connects the cathode of the second diode D2.The cathode of the HV pin connection first diode D1 of chip.
In another embodiment of the invention, the control system further includes rectifier bridge, Cbus capacitor；The rectifier bridge
Second end connects the HV pin of the first end of Cbus capacitor, chip；The second end of Cbus capacitor, the 4th end of rectifier bridge connect respectively
Ground.The first end of rectifier bridge, third end are separately connected power-supply filter (EMI filter).
The present invention also discloses a kind of control method, and in one embodiment of this invention, the control method includes:
Connection type identification step, the link position of the setting pin of identification chip；
Set-up function rate-determining steps open setting function according to the information control chip of connection type identification step feedback
It can or close set-up function.
In one embodiment of this invention, in set-up function rate-determining steps, the function of control is discharging function, set-up function
Rate-determining steps are discharging function rate-determining steps；It is put according to the information control chip unlatching of connection type identification step feedback
Electricity Functional closes discharging function.
In one embodiment of this invention, in connection type identification step, the voltage of the HV pin of chip is obtained, and with this
Identification HV pin is connected to the rectifier diode before rectifier bridge, is still connected to the bus after rectifier bridge；
In discharging function rate-determining steps, X- is opened or closed according to the result control chip of connection type identification step identification
CAP discharging function: if the result of connection type identification step identification is that HV pin is connected to the rectifier diode before rectifier bridge,
It then controls chip and opens X-CAP discharging function；If the result of connection type identification step identification is after HV pin is connected to rectifier bridge
Bus, then control chip close X-CAP discharging function.
In one embodiment of this invention, in connection type identification step, (sentence when system meets X-CAP discharging condition
Disconnected mode are as follows: judge whether to meet X-CAP discharging condition by sampling HV pin voltage signal, when detecting that HV signal setting
When not occurring the rate of rise in the time, determines input AC power down, meet X-CAP discharging condition；See the correlation of Fig. 5 or more
Description), sample the voltage of HV pin；Discharging function inside testability unlatching for a period of time, before discharging by comparing and discharges
HV voltage change situation afterwards determines the capacitance of HV pin connection capacitor, so that distinguishing HV pin is connected to diode before rectifier bridge
Still it is connected to after rectifier bridge on bus.When the HV pin is connected to diode before rectifier bridge, the corresponding capacitor of HV pin is X-CAP
Capacitor, and when being connected to bus after rectifier bridge, the corresponding capacitor of HV pin is bus Cbus capacitor；The capacitance of X-CAP capacitor is small
In the capacitance of Cbus capacitor.If HV voltage change is greater than given threshold, judge that the corresponding capacitor of HV pin corresponds to capacitance
Lesser X-CAP capacitor judges that HV pin is connected to diode before rectifier bridge.If HV voltage change is less than given threshold, judge
The corresponding capacitor of HV pin corresponds to the biggish Cbus capacitor of capacitance, judges that HV pin is connected to bus after rectifier bridge.
In one embodiment of this invention, the control method includes: to reach and set in the setting pin continuous discharge of chip
After determining number, the discharging function of setting pin is closed in control.
In one embodiment of this invention, the control method includes:
Discharging function closes rate-determining steps, and after the HV pin continuous discharge of chip reaches setting number, HV is closed in control
Hereafter pin discharging function is not up to setting condition and is not then turned on discharging function；And
Discharging function resets rate-determining steps, and the discharging function of HV pin is resetted after system trigger abnormal protection.
In conclusion control system proposed by the present invention, control circuit and control method, can be improved the simultaneous of the application of chip
Capacitive, make chip according to system application environment it is adaptive open or close X-cap discharging function.
When needing X-CAP discharging function, control system can work as system itself and not need band X-CAP such as Fig. 1 connection
When capacitor discharging function, control system can be directly as shown in Fig. 2, can save two diodes in this way.
Description and application of the invention herein are illustrative, is not wishing to limit the scope of the invention to above-described embodiment
In.The deformation and change of embodiments disclosed herein are possible, the realities for those skilled in the art
The replacement and equivalent various parts for applying example are well known.It should be appreciated by the person skilled in the art that not departing from the present invention
Spirit or essential characteristics in the case where, the present invention can in other forms, structure, arrangement, ratio, and with other components,
Material and component are realized.Without departing from the scope and spirit of the present invention, can to embodiments disclosed herein into
The other deformations of row and change.
Claims (18)
1. a kind of control circuit, which is characterized in that the control circuit connects chip, and the control circuit includes:
Connection type identification module, the link position of the setting pin to identification chip, and link position information is fed back to
One set-up function control module；And
Set-up function control module connects the connection type identification module, to anti-according to the connection type identification module
The information control chip of feedback opens set-up function or closes set-up function；
The function of the set-up function control module control is discharging function, and the set-up function control module is discharging function control
Molding block；
The information control chip that the discharging function control module is fed back according to the connection type identification module opens electric discharge function
It can or close discharging function.
2. control circuit according to claim 1, it is characterised in that:
The voltage of HV pin of the connection type identification module to obtain chip, and identify that HV pin is connected to positioned at whole with this
Rectifier diode before flowing bridge, is still connected to the bus after rectifier bridge.
3. control circuit according to claim 2, it is characterised in that:
The discharging function control module to identified according to the connection type identification module result control chip open or
Close X-CAP discharging function；
If the result of the connection type identification module identification is that HV pin is connected to the rectifier diode before rectifier bridge, put
Electric work energy control module controls chip and opens X-CAP discharging function；
If the result of the connection type identification module identification is that HV pin is connected to the bus after rectifier bridge, discharging function control
Module controls chip and closes X-CAP discharging function.
4. control circuit according to claim 2, it is characterised in that:
The connection type identification module samples the voltage of HV pin when system meets X-CAP discharging condition；
The connection type identification module is to open internal discharging function for a period of time, by comparing before discharging and after electric discharge
HV voltage change situation determine the capacitance of HV pin connection capacitor, to distinguish before HV pin is connected to rectifier bridge diode also
It is after being connected to rectifier bridge on bus；
When the HV pin is connected to diode before rectifier bridge, the corresponding capacitor of HV pin is X-CAP capacitor, and after being connected to rectifier bridge
When bus, the corresponding capacitor of HV pin is bus Cbus capacitor；The capacitance of X-CAP capacitor is less than the capacitance of Cbus capacitor；
If HV voltage change is greater than given threshold, judge that the corresponding capacitor of HV pin corresponds to the lesser X-CAP capacitor of capacitance,
Judge that HV pin is connected to diode before rectifier bridge；
If HV voltage change is less than given threshold, judge that the corresponding capacitor of HV pin corresponds to the biggish Cbus capacitor of capacitance,
Judge that HV pin is connected to bus after rectifier bridge.
5. control circuit according to claim 4, it is characterised in that:
The connection type identification module includes comparison discharge power supply V1, comparator U1, switching tube S1, first resistor R1, second
Resistance R2, first capacitor C1；
The first end of the first resistor R1 connects HV pin, and the second end of first resistor R1 is separately connected the of second resistance R2
One end, comparator U1 normal phase input end, compare discharge power supply V1 anode, comparison discharge power supply V1 cathode pass through switching tube
S1 is separately connected the first end of the inverting input terminal of comparator U1, first capacitor C1, and the second end of first capacitor C1 is grounded, and second
The second end of resistance R2 is grounded.
6. control circuit according to claim 5, it is characterised in that:
The first HV of the 2nd HV voltage HV2, inverting input terminal input that the comparator U1 is inputted by comparing normal phase input end
Voltage HV1 judges before HV pin is connected to rectifier bridge after diode is still connected to rectifier bridge on bus；
If the 2nd HV voltage HV2 voltage is consistently higher than the first HV voltage HV1 in a discharge cycle, then illustrate on HV pin
Capacitance is larger, and the discharging function control module closes X-CAP discharging function, conversely, illustrating that capacitor is smaller on HV pin, then
It is in the open state to continue to X-CAP discharging function.
7. control circuit according to claim 4, it is characterised in that:
The connection type identification module by sample HV pin voltage signal judge whether to meet X-CAP discharging condition, work as inspection
When measuring HV signal and not occurring the rate of rise within the set time, determines input AC power down, meet X-CAP discharging condition.
8. a kind of control circuit, which is characterized in that the control circuit connects chip, and the control circuit includes:
Discharging function control module, after reaching setting number to the HV pin continuous discharge in chip, HV pin is closed in control
Discharging function.
9. control circuit according to claim 8, it is characterised in that:
The discharging function control module includes:
Discharging function closes control unit, and after reaching setting number to the HV pin continuous discharge in chip, HV is closed in control
Pin discharging function；And
Discharging function resets control unit, to reset the discharging function of HV pin after system trigger abnormal protection.
10. a kind of control system, it is characterised in that: including any control circuit of claim 1 to 9, the control electricity
The setting pin of road connection chip.
11. control system according to claim 10, it is characterised in that:
The control system further includes rectifier bridge, first diode D1, second diode D2, X-CAP capacitor, Cbus capacitor；
The first end of the rectifier bridge is separately connected the first end of the anode of first diode D1, X-CAP capacitor, and the of rectifier bridge
Two ends connect the first end of Cbus capacitor, and the third end of rectifier bridge is separately connected the anode of the second diode D2, X-CAP capacitor
Second end, the second end of Cbus capacitor, the 4th end of rectifier bridge are grounded respectively；The cathode of first diode D1 connects the two or two pole
The cathode of pipe D2；The cathode of the HV pin connection first diode D1 of chip.
12. control system according to claim 10, it is characterised in that:
The control system further includes rectifier bridge, Cbus capacitor；
The second end of the rectifier bridge connects the HV pin of the first end of Cbus capacitor, chip；The second end of Cbus capacitor, rectification
4th end of bridge is grounded respectively.
13. a kind of control method, which is characterized in that the control method includes:
Connection type identification step, the link position of the setting pin of identification chip；
Set-up function rate-determining steps, according to the connection type identification step feedback information control chip open set-up function or
Close set-up function；
In set-up function rate-determining steps, the function of control is discharging function, and set-up function rate-determining steps are discharging function control
Step；Discharging function is opened according to the information control chip of connection type identification step feedback or closes discharging function.
14. control method according to claim 13, it is characterised in that:
In connection type identification step, the voltage of the HV pin of chip is obtained, and identify that HV pin is connected to positioned at rectifier bridge with this
Preceding rectifier diode is still connected to the bus after rectifier bridge；
In discharging function rate-determining steps, X-CAP is opened or closed according to the result control chip of connection type identification step identification
Discharging function:
If the result of connection type identification step identification is that HV pin is connected to the rectifier diode before rectifier bridge, core is controlled
Piece opens X-CAP discharging function；
If the result of connection type identification step identification is that HV pin is connected to the bus after rectifier bridge, controls chip and close X-
CAP discharging function.
15. control method according to claim 14, it is characterised in that:
In connection type identification step, when system meets X-CAP discharging condition, the voltage of HV pin is sampled；Testability is opened
Internal discharging function determines that HV pin connects electricity with the HV voltage change situation after electric discharge for a period of time, by comparing before discharging
The capacitance of appearance is still connected to after rectifier bridge on bus to distinguish HV pin and be connected to diode before rectifier bridge；
When the HV pin is connected to diode before rectifier bridge, the corresponding capacitor of HV pin is X-CAP capacitor, and after being connected to rectifier bridge
When bus, the corresponding capacitor of HV pin is bus Cbus capacitor；The capacitance of X-CAP capacitor is less than the capacitance of Cbus capacitor；
If HV voltage change is greater than given threshold, judge that the corresponding capacitor of HV pin corresponds to the lesser X-CAP capacitor of capacitance,
Judge that HV pin is connected to diode before rectifier bridge；
If HV voltage change is less than given threshold, judge that the corresponding capacitor of HV pin corresponds to the biggish Cbus capacitor of capacitance,
Judge that HV pin is connected to bus after rectifier bridge.
16. control circuit according to claim 15, it is characterised in that:
The connection type identification module by sample HV pin voltage signal judge whether to meet X-CAP discharging condition, work as inspection
When measuring HV signal and not occurring the rate of rise within the set time, determines input AC power down, meet X-CAP discharging condition.
17. a kind of control method, which is characterized in that the control method includes: to reach in the setting pin continuous discharge of chip
After setting number, the discharging function of setting pin is closed in control.
18. control method according to claim 17, it is characterised in that:
The control method includes:
Discharging function closes rate-determining steps, and after the HV pin continuous discharge of chip reaches setting number, HV pin is closed in control
Hereafter discharging function is not up to setting condition and is not then turned on discharging function；And
Discharging function resets rate-determining steps, and the discharging function of HV pin is resetted after system trigger abnormal protection.
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