CN208571948U - A kind of primary side feedback Switching Power Supply control chip, control system and charger - Google Patents
A kind of primary side feedback Switching Power Supply control chip, control system and charger Download PDFInfo
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- CN208571948U CN208571948U CN201821081664.5U CN201821081664U CN208571948U CN 208571948 U CN208571948 U CN 208571948U CN 201821081664 U CN201821081664 U CN 201821081664U CN 208571948 U CN208571948 U CN 208571948U
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Abstract
A kind of primary side feedback Switching Power Supply control chip, control system and charger, including reference voltage unit, comparator unit, voltage monitoring unit, driving unit, switch unit and rectification unit, Switching Power Supply control chip eliminates self-powered time generator, the self-powered time in signal period is determined by the voltage of the Voltage Feedback pin of Switching Power Supply control chip, furthermore, energy-storage module for powering to Switching Power Supply control chip is connected between the power pins and Voltage Feedback pin of Switching Power Supply control chip, so that no matter control system works under confession power mode or non-confession power mode, electric current passes through voltage sample module, and then make identical by the peak point current expression formula of energy storage voltage changing module, to make the performance for not influencing control system in the self-powered mode, with minimum load energy under constant voltage mode Power is strong, and constant current accuracy height and line regulation are good under constant current mode.
Description
Technical field
The utility model belong to technical field of integrated circuits more particularly to a kind of primary side feedback Switching Power Supply control chip,
Control system and charger.
Background technique
Currently, primary side feedback Switching Power Supply control chip includes self-powered time generator, the self-powered in signal period
Time is determined by the built-in set time；In addition, the power supply capacitor of Switching Power Supply control chip is connected to primary side feedback switch electricity
Source controls between the power pins and ground pin of chip, still, confession power mode and non-confession due to powered-down source control system
The difference of the control mode of power mode makes the peak point current expression formula for confessing power mode and the primary side inductance under non-confession power mode
Difference leads to the peak point current difference for confessing power mode with primary side inductance under non-confession power mode, therefore big small echo occurs
Situation, so that error is big.Further, since containing input direct-current voltage in primary side inductive current expression formula under confession power mode
Value, so that its precision is influenced by power-frequency voltage, causes fictitious load under constant voltage mode big and unstable, constant current under constant current mode
Precision is low and line regulation is poor.
Therefore, self-powered primary side feedback switching power control system in traditional technical solution exist confession power mode and
Primary side inductance peak point current expression formula under non-confession power mode is different and leads to the problem of performance difference.
Utility model content
The utility model provides a kind of self-powered primary side feedback switching power control system, it is intended to solve traditional technical side
There is the primary side inductance under confession power mode and non-confession power mode in the self-powered primary side feedback switching power control system in case
Peak point current expression formula is different and leads to the problem of performance difference.
The utility model is realized in this way a kind of primary side feedback Switching Power Supply controls chip, comprising:
For providing the reference voltage unit of reference voltage signal；
Connect with the Voltage Feedback pin, for access the reference voltage signal and with the Voltage Feedback pin it is anti-
The voltage detection signal of feedback is compared to export the comparator unit of control signal；
It is connect with the power pins and described ground pin, for monitoring the power pins voltage, and according to the electricity
The voltage monitoring unit of the size relation of source pin voltage and self-powered preset voltage value output power supplying control signal；
It is connect with the comparator unit and voltage monitoring unit, for according to the control signal and the power supply control
The driving unit of signal progress output drive signal；
It is connect with the driving unit, for being confessed between power mode and non-confession power mode according to the driving signal
The switch unit of switching；And
It is connected between the switch unit and the power pins, for rectifying the rectification unit of processing.
In one of the embodiments, when the power pins voltage is lower than self-powered preset voltage value, the primary side
Feedback switch power supply control chip works in confession power mode；It is not less than self-powered preset voltage value in the power pins voltage
When, the primary side feedback Switching Power Supply control chip operation is in non-confession power mode.
The voltage monitoring unit includes: first resistor, second resistance, first comparator in one of the embodiments,
And d type flip flop；The first end of the first resistor as the voltage monitoring unit voltage detection terminal and with the power supply
The first end of pin connection, the second resistance is grounded and as described ground pin, the inverting input terminal of the first comparator
It is connected between the second end of the first resistor and the second end of the second resistance, the homophase input of the first comparator
It terminates into reference voltage signal, the output end of the first comparator is connect with the first input end of the d type flip flop, the D
Second input terminal of trigger accesses pulse signal, and the output end of the d type flip flop is connect with the driving unit.
The comparator unit includes: to connect with the Voltage Feedback pin in one of the embodiments, for accessing
First reference voltage signal is simultaneously compared with the voltage detection signal of Voltage Feedback pin feedback to export the first control
Second comparator of signal；Connect with the Voltage Feedback pin, for access the second reference voltage signal and with the voltage
The voltage detection signal of feedback pin feedback is compared to export the third comparator of second control signal.
The driving unit includes: the output end and the electricity with second comparator in one of the embodiments,
The output end connection for pressing detection unit, drives for carrying out output first according to the first control signal and the confession electric signal
The metal-oxide-semiconductor driving of dynamic signal；With the output end and the voltage of the output end of second comparator, the third comparator
The output end of detection unit connects, for according to the first control signal, the second control signal and the self-powered
Signal carries out the triode driving of the second driving signal of output.
The switch unit includes first switch tube and second switch in one of the embodiments, and described second opens
The control terminal for closing pipe is connect with the output end that triode drives, and the hot end of the second switch is power switch pin,
The cold end of the second switch is connect with the hot end of the first switch tube, the control terminal of the first switch tube
It is connect with the output end of metal-oxide-semiconductor driving, the cold end of the first switch tube is the Voltage Feedback pin.
Secondly, additionally providing a kind of primary side feedback switching power control system, comprising:
It is electrically connected with city, the current rectifying and wave filtering circuit module for rectifying and wave-filtering processing；
It is connect with the current rectifying and wave filtering circuit module, the primary side feedback Switching Power Supply for switching powering mode controls
Chip；
It is connected between the power pins and Voltage Feedback pin of the primary side feedback Switching Power Supply control chip, for giving
The energy-storage module of the primary side feedback Switching Power Supply control chip power supply；
It is connected between the ground pin and Voltage Feedback pin of the primary side feedback Switching Power Supply control chip, for detecting
The voltage sample module of the Voltage Feedback pin voltage；And
It is connected between the ground pin and output loading of the primary side feedback Switching Power Supply control chip, the storage for energy storage
It can voltage changing module.
The energy-storage module includes storage capacitor in one of the embodiments, the first end of the storage capacitor and institute
State primary side feedback Switching Power Supply control chip power pins connection, the second end of the storage capacitor with the primary side feedback
Switching Power Supply controls the Voltage Feedback pin connection of chip.
The voltage sample module includes 3rd resistor in one of the embodiments, the first end of the 3rd resistor
It is connect altogether with the Voltage Feedback pin of the second end of the storage capacitor and primary side feedback Switching Power Supply control chip, described the
The second end of three resistance is connect with the ground pin of primary side feedback Switching Power Supply control chip.
In addition, additionally providing a kind of charger, including above-mentioned primary side feedback switching power control system.
Above-mentioned self-powered primary side feedback switching power control system, used Switching Power Supply control chip eliminate certainly
Power-on time generator, the self-powered time in signal period are determined by the voltage of the Voltage Feedback pin of Switching Power Supply control chip
It is fixed, in addition, the energy-storage module for powering to Switching Power Supply control chip is connected to the power pins of Switching Power Supply control chip
Between Voltage Feedback pin, so that no matter control system works under confession power mode or non-confession power mode, electric current is equal
By voltage sample module, so make it is identical by the peak point current electrical parameter of energy storage voltage changing module, to make in self-powered mould
The performance of control system is not influenced under formula, have constant voltage mode under minimum load ability it is strong, under constant current mode constant current accuracy height and
Line regulation is good.
Detailed description of the invention
Fig. 1 is the module diagram that the primary side feedback Switching Power Supply that an embodiment of the present invention provides controls chip；
Fig. 2 is the circuit diagram that the primary side feedback Switching Power Supply that an embodiment of the present invention provides controls chip；
Fig. 3 is the module diagram for the primary side feedback switching power control system that an embodiment of the present invention provides；
Fig. 4 is the circuit diagram for the primary side feedback switching power control system that an embodiment of the present invention provides；
Fig. 5 is the self-powered pattern switching for the primary side feedback switching power control system that an embodiment of the present invention provides
When primary side inductive current waveform diagram；
When Fig. 6 is the mains voltage variations for the primary side feedback switching power control system that an embodiment of the present invention provides
Primary side inductive current waveform diagram.
Specific embodiment
In order to make the purpose of the utility model, technical solutions and advantages more clearly understood, below in conjunction with attached drawing and implementation
Example, the present invention will be further described in detail.It should be appreciated that specific embodiment described herein is only used to explain
The utility model is not used to limit the utility model.
Fig. 1 shows the module signal of the primary side feedback Switching Power Supply control chip of the utility model preferred embodiment offer
Figure, for ease of description, only the parts related to this embodiment are shown, and details are as follows:
With reference to Fig. 1, a kind of primary side feedback Switching Power Supply controls chip, have power pins VCC, pin GND, voltage
Feedback pin CS, electric current input pin OB and power switch pin OC, comprising: voltage monitoring unit 100, reference voltage unit
200, comparator unit 300, driving unit 400, switch unit 500 and rectification unit 600.
Wherein, reference voltage unit 200 is for providing reference voltage signal；Comparator unit 300 and Voltage Feedback pin
CS connection, for accessing reference voltage signal and being compared with the voltage detection signal of Voltage Feedback pin CS feedback to export
Control signal；Voltage monitoring unit 100 is connect with power pins VCC and ground pin GND, for monitoring power pins VCC electricity
Pressure, and power supplying control signal is exported according to the size relation of power pins VCC voltage and self-powered preset voltage value；Driving unit
400 connect with comparator unit 300 and voltage monitoring unit 100, defeated for being carried out according to control signal and power supplying control signal
Driving signal out；Switch unit 500 is connect with driving unit 400, for confessing power mode and non-confession according to driving signal
Switch between power mode；Rectification unit 600 is connected between switch unit 500 and power pins VCC, is handled for rectification.This
The control chip of primary side feedback Switching Power Supply used by embodiment eliminates self-powered time generator, the confession in signal period
The electric time is determined by the voltage of the Voltage Feedback pin of Switching Power Supply control chip.
In one of the embodiments, when power pins VCC voltage is lower than self-powered preset voltage value, primary side feedback is opened
Powered-down source control chip operation is in confession power mode；And when power pins voltage is not less than self-powered preset voltage value, primary side
Feedback switch power supply control chip works in non-confession power mode.
In one of the embodiments, refer to Fig. 2, voltage monitoring unit 100 include: first resistor R1, second resistance R2,
First comparator U1 and d type flip flop DFF；Voltage detection terminal of the first end of first resistor R1 as voltage monitoring unit 100
And connect with power pins VCC, the first end of second resistance R2 is grounded and as ground pin GND, the reverse phase of first comparator U1
Input terminal is connected between the second end of first resistor R1 and the second end of second resistance R2, the homophase input of first comparator U1
It terminates into reference voltage signal, the output end of first comparator U1 is connect with the first input end of d type flip flop DFF, d type flip flop
The second input terminal of DFF accesses pulse signal, and the output end of d type flip flop DFF is connect with driving unit 400.In the present embodiment
First resistor R1 and second resistance R2 is used to detect the voltage of power pins VCC as divider resistance, and power pins VCC's
When voltage is lower than self-powered preset voltage value, first comparator U1 exports high level so that d type flip flop control first to d type flip flop
The self-powered of switching tube Q1 and second switch Q2 switched to realize Switching Power Supply control chip, so that control system is individually all
Power-on time in phase is determined by the voltage of Voltage Feedback pin CS, it is convenient to omit self-powered time generator.
Fig. 2 is referred in one of the embodiments, and comparator unit 300 includes the second comparator U2 and third comparator
U3.Wherein, the second comparator U2 is connect with Voltage Feedback pin CS, for access the first reference voltage signal Vcs_pre and with
The voltage detection signal of Voltage Feedback pin CS feedback is compared to export first control signal；Third comparator U3 and voltage
Feedback pin CS connection, the voltage detecting for accessing the second reference voltage signal Vcs_pk and with Voltage Feedback pin CS feedback
Signal is compared to export second control signal.The voltage inspection fed back by Voltage Feedback pin CS may be implemented in the present embodiment
It surveys signal and exports first control signal and second control signal compared with reference voltage signal Vcs_pre, and then can determine
The self-powered time in signal period.
Fig. 2 is referred in one of the embodiments, and driving unit 400 includes that metal-oxide-semiconductor driving U4 and triode drive U5.
Wherein, metal-oxide-semiconductor driving U4 is connect with the output end of the output end of the second comparator U2 and voltage detection unit, for according to first
Control signal and confession electric signal carry out the first driving signal of output；The output end of triode driving U5 and third comparator U3,
The output end connection of the output end and voltage detection unit of second comparator, for according to first control signal, the second control
Signal and confession electric signal carry out the second driving signal of output.
Fig. 2 is referred in one of the embodiments, switch unit 500 includes first switch tube M1 and second switch Q1,
The control terminal of second switch Q1 is connect with the output end of triode driving U5, and the hot end of second switch Q1 is opened for power
Pin OC is closed, the cold end of second switch Q1 is connect with the hot end of first switch tube M1, the control of first switch tube M1
End processed is connect with the output end of metal-oxide-semiconductor driving U4, and the cold end of first switch tube M1 is Voltage Feedback pin CS.Wherein,
One switching tube M1 is NMOS tube, and grid, drain electrode and the source electrode of NMOS tube are respectively the control terminal of first switch tube, high potential
End and cold end；Second switch Q1 is triode, and base stage, collector and the emitter of triode are respectively second to open
Close control terminal, hot end and the cold end of pipe Q1.First switch tube M1 cut-off in the present embodiment, second switch Q1
When conducting, diode D1 allows self-powered electric current by diode D1 to charge to external storage capacitor C1, and opens first
Pipe M1 conducting, second switch Q1 are closed by diode D1 is not allow current through external storage capacitor C1, to realize certainly
Power supply function.
Fig. 2 and 4 is referred in one of the embodiments, and rectification unit 600 includes first diode D1, first diode
The anode of D1 is connected between the hot end of first switch tube M1 and the cold end of second switch Q1, first diode D1
Cathode formed primary side feedback switching power source chip 10 power pins VCC and connect with voltage monitoring unit 100.This implementation
Diode D1 in example allows self-powered electric current to pass through diode in first switch tube M1 cut-off, second switch Q1 conducting
D1 is to charge to external storage capacitor C1, and in first switch tube M1 conducting, second switch Q1 by not allowing electric current logical
External storage capacitor C1 is crossed, to realize rectified action.
As above-mentioned, voltage monitoring unit 100 is used to detect the power pins VCC's of primary side feedback switching power source chip 10
Voltage, and when the voltage of power pins VCC is lower than self-powered preset voltage value, illustrate the outside connecting with power pins VCC
Storage capacitor electric energy is insufficient, and voltage monitoring unit 100 exports trigger signal EN_ to first switch tube M1 and second switch Q1
CHG is to control first switch tube M1 by, second switch Q1 conducting, thus do not allow electric current by first switch tube M1, from
And realize self-powered.
Secondly, a kind of primary side feedback switching power control system is additionally provided, with reference to Fig. 3, the primary side feedback Switching Power Supply
Control system includes: primary side feedback Switching Power Supply control chip 10, energy-storage module 20, voltage sample module 30, energy storage transformation mould
Block 40 and current rectifying and wave filtering circuit module 50.
Wherein, current rectifying and wave filtering circuit module 50 is electrically connected with city, is handled for rectifying and wave-filtering；Primary side feedback Switching Power Supply control
Coremaking piece 10 is connect with current rectifying and wave filtering circuit module 50, for switching powering mode；Energy-storage module 20 is connected to primary side feedback and opens
Between the power pins VCC and Voltage Feedback pin CS for closing power supply control chip 10, for being controlled to primary side feedback Switching Power Supply
Chip 10 is powered；Voltage sample module 30 be connected to primary side feedback Switching Power Supply control chip 10 ground pin GND and voltage it is anti-
It presents between pin CS, for detecting Voltage Feedback pin CS voltage；Energy storage voltage changing module 40 is connected to primary side feedback Switching Power Supply
Between the ground pin GND and output loading for controlling chip 10, it to be used for energy storage.
In one of the embodiments, refer to Fig. 4, energy-storage module 20 include storage capacitor C1, the first of storage capacitor C1
End with primary side feedback Switching Power Supply control chip 10 power pins VCC connect, the second end of storage capacitor C1 with it is anti-with primary side
Present the Voltage Feedback pin CS connection of Switching Power Supply control chip 10.Storage capacitor C1 is for anti-to primary side in the self-powered mode
Present electric current when Switching Power Supply control chip 10 power supply and monitoring self-powered.It is anti-that storage capacitor C1 is connected to primary side by the present embodiment
Between the power pins VCC and Voltage Feedback pin CS for presenting Switching Power Supply control chip 10, so that transformer primary side inductance L0
Peak point current expresses formulaTo make by transformer primary side electricity
The peak point current for feeling L0 is identical, without big small echo (referring to Fig. 5), improves the performance of control system；In addition, the transformer primary side
The peak point current expression formula of inductance L0 is unrelated with input direct-current voltage, so that in input direct-current voltage change, transformer primary side
The electric current of inductance L0 is still identical, without big small echo (referring to Fig. 6), to further improve the performance of control system.
Fig. 4 is referred in one of the embodiments, and voltage sample module 30 includes 3rd resistor R3,3rd resistor R3's
First end and the Voltage Feedback pin CS of second end and primary side feedback Switching Power Supply the control chip 10 of storage capacitor C1 connect altogether,
The second end of 3rd resistor R3 is connect with the ground pin GND of primary side feedback Switching Power Supply control chip 10.3rd resistor R3 is used for
The electric current of 3rd resistor R3 is flowed through in detection, while being also the size of current that energy storage voltage changing module 40 is flowed through in detection.
Fig. 4 is referred in one of the embodiments, and energy storage voltage changing module 40 includes transformer and the second diode D2, is become
The primary side winding of depressor is connect with the ground pin of primary side feedback Switching Power Supply control chip 10, the vice-side winding of transformer and second
The anode of diode D2 connects, and the cathode of the second diode D2 is connected to output loading.
In one of the embodiments, refer to Fig. 4, current rectifying and wave filtering circuit module 50 include rectifier bridge, filter capacitor C2 with
And the first end of the 4th resistance R4, filter capacitor C2 and the output end of rectifier bridge connect, the second end ground connection of filter capacitor C2, the
Four resistance R4 be connected to primary side feedback Switching Power Supply control chip 10 electric current input pin OB and power switch pin OC it
Between, for starting primary side feedback Switching Power Supply control chip 10 and keeping the base current of triode Q1 in the self-powered stage.
Its working principle is illustrated by taking primary side feedback switching power control system shown in Fig. 4 as an example below, is described in detail
It is as follows:
The confession power mode of the primary side feedback switching power control system and non-self-powered pattern switching are run, and are drawn in power supply
When the voltage of foot VCC is lower than the voltage VCC_CHG that storage capacitor C1 needs to charge, d type flip flop DFF exports high level, i.e. EN_
CHG=1, control system work in confession power mode；And the voltage of storage capacitor C1 be higher than VCC_CHG when, d type flip flop DFF is defeated
Low level out, i.e. EN_CHG=0, control system work in non-confession power mode.The primary side feedback switching power control system work
Make timing to be made of 4 stages:
First stage: triode Q1 conducting, NMOS tube M1 conducting, transformer primary side inductance L0 energy storage, electric current pass through transformation
The ground pin of device primary inductor L 0, triode Q1, NMOS tube M1,3rd resistor R3 to primary side feedback Switching Power Supply control chip
GND；When the electric current of transformer primary side inductance L0 rises to the second comparator U2 reference voltage, the second comparator U2 is exported by 0
Overturning is 1, and control system enters second stage, and the current expression of transformer primary side inductance L0 are as follows:
Wherein, Vcs_pre is the reference voltage of the second comparator U2, and R3 is the resistance value of 3rd resistor.
Second stage: in the self-powered mode, triode Q1 conducting, NMOS tube M1 shutdown, transformer primary side inductance L0 storage
Can, electric current is by transformer primary side inductance L0, triode Q1, first diode D1, storage capacitor C1,3rd resistor R3 to original
The ground pin GND of side feedback switch power supply control chip, the electric current charges to storage capacitor C1 at this time, as self-powered；Wait become
When the electric current of depressor primary inductor L 0 rises to third comparator U3 reference voltage, third comparator U3 output is 1 by 0 overturning,
Control system enters the phase III, confesses the current expression of transformer primary side inductance L0 under power mode are as follows:
And under non-confession power mode, triode Q1 conducting, NMOS tube M1 conducting, transformer primary side inductance L0 energy storage, electricity
Stream controls chip by transformer primary side inductance L0, triode Q1, NMOS tube M1,3rd resistor R3 to primary side feedback Switching Power Supply
Ground pin GND；When the electric current of transformer primary side inductance L0 rises to third comparator U3 reference voltage, third comparator
U3 output is 1 by 0 overturning, and control system enters the phase III, the ammeter of transformer primary side inductance L0 under non-confession power mode
Up to formula are as follows:
Under confession power mode and non-confession power mode, the electric current of transformer primary side inductance L0 passes through 3rd resistor R3,
So that the peak point current expression formula of transformer primary side inductance L0 is equal are as follows:
Wherein, Vcs_pk is the reference voltage of third comparator U3, and R3 is the resistance value of 3rd resistor,
I_inductor is transformer primary side inductance L0 electric current.Due to the current expression phase of transformer primary side inductance L0
When together, so that switching between self-powered and non-confession power mode, without big small echo, as shown in Figure 5；Due to transformer primary side inductance
The current expression of L0 is unrelated with input direct-current voltage, so that in input direct-current voltage change, transformer primary side inductance L0's
Electric current is still identical, without big small echo, as shown in Figure 6.
Phase III: triode Q1 shutdown, NMOS tube M1 shutdown, the energy transmission that transformer primary side inductance L0 is stored to pair
Sideline circle L1 discharges, and to secondary side by the second diode D2, output loading, the electric current of secondary coil L1 gradually drops electric current
Low, when the current reduction of secondary coil L1 is 0, the energy release of transformer primary side inductance L0 is finished, and control system enters the
Four stages.
Fourth stage: system calculates the time of adjustment fourth stage by feedback, with adjustment output constant pressure or output constant current.
In addition, a kind of charger is additionally provided, including above-mentioned primary side feedback switching power control system.
The utility model has the beneficial effects that
1, primary side feedback Switching Power Supply control chip eliminates self-powered time generator, when self-powered in signal period
Between determined by the voltage of Voltage Feedback pin of Switching Power Supply control chip.
2, the storage capacitor for powering to primary side feedback Switching Power Supply control chip is connected to primary side feedback Switching Power Supply
Control chip power pins and Voltage Feedback pin between so that control system no matter work confession power mode or it is non-oneself
Under powering mode, electric current passes through 3rd resistor (sampling resistor), and then makes the crest ammeter by transformer primary winding
It is identical up to formula, without big small echo.
3, primary side feedback switching power control system is not influenced in the self-powered mode by big small echo, so that control system
System minimum load ability under constant voltage mode is strong, and constant current accuracy height and line regulation are good under constant current mode.
The above is only the preferred embodiment of the utility model only, is not intended to limit the utility model, all at this
Made any modifications, equivalent replacements, and improvements etc., should be included in the utility model within the spirit and principle of utility model
Protection scope within.
Claims (10)
1. a kind of primary side feedback Switching Power Supply controls chip, including power pins, pin, Voltage Feedback pin, electric current input
Pin and power switch pin characterized by comprising
For providing the reference voltage unit of reference voltage signal；
Connect with the Voltage Feedback pin, for access the reference voltage signal and with the Voltage Feedback pin feedback
Voltage detection signal is compared to export the comparator unit of control signal；
It connect with the power pins and described ground pin, draws for monitoring the power pins voltage, and according to the power supply
The voltage monitoring unit of the size relation of foot voltage and self-powered preset voltage value output power supplying control signal；
It is connect with the comparator unit and voltage monitoring unit, for according to the control signal and the power supplying control signal
Carry out the driving unit of output drive signal；
It is connect with the driving unit, for being switched between confession power mode and non-confession power mode according to the driving signal
Switch unit；And
It is connected between the switch unit and the power pins, for rectifying the rectification unit of processing.
2. primary side feedback Switching Power Supply as described in claim 1 controls chip, which is characterized in that
When the power pins voltage is lower than self-powered preset voltage value, the primary side feedback Switching Power Supply controls chip operation
In confession power mode；
When the power pins voltage is not less than self-powered preset voltage value, the primary side feedback Switching Power Supply controls chip work
Make in non-confession power mode.
3. primary side feedback Switching Power Supply as described in claim 1 controls chip, which is characterized in that the voltage monitoring unit packet
It includes: first resistor, second resistance, first comparator and d type flip flop；
The first end of the first resistor as the voltage monitoring unit voltage detection terminal and connect with the power pins,
The first end of the second resistance is grounded and as described ground pin, and the inverting input terminal of the first comparator is connected to described
Between the second end of first resistor and the second end of the second resistance, the non-inverting input terminal of the first comparator accesses benchmark
Voltage signal, the output end of the first comparator are connect with the first input end of the d type flip flop, and the of the d type flip flop
Two input terminals access pulse signal, and the output end of the d type flip flop is connect with the driving unit.
4. primary side feedback Switching Power Supply as described in claim 1 controls chip, which is characterized in that the comparator unit packet
It includes:
Connect with the Voltage Feedback pin, for access the first reference voltage signal and with the Voltage Feedback pin feedback
Voltage detection signal is compared to export the second comparator of first control signal；With
Connect with the Voltage Feedback pin, for access the second reference voltage signal and with the Voltage Feedback pin feedback
Voltage detection signal is compared to export the third comparator of second control signal.
5. primary side feedback Switching Power Supply as claimed in claim 4 controls chip, which is characterized in that the driving unit includes:
It is connect with the output end of the output end of second comparator and the voltage detection unit, for according to first control
Signal processed and the confession electric signal carry out the metal-oxide-semiconductor driving of the first driving signal of output；With
With the output of the output end, the output end and the voltage detection unit of the third comparator of second comparator
End connection, for carrying out output the according to the first control signal, the second control signal and the confession electric signal
The triode of two driving signal drives.
6. primary side feedback Switching Power Supply as claimed in claim 5 controls chip, which is characterized in that the switch unit includes the
The control terminal of one switching tube and second switch, the second switch is connect with the output end that triode drives, and described second
The hot end of switching tube is power switch pin, the height electricity of the cold end of the second switch and the first switch tube
The connection of position end, the control terminal of the first switch tube connect with the output end that the metal-oxide-semiconductor drives, the first switch tube it is low
Potential end is the Voltage Feedback pin.
7. a kind of primary side feedback switching power control system characterized by comprising
It is electrically connected with city, the current rectifying and wave filtering circuit module for rectifying and wave-filtering processing；
Connect with the current rectifying and wave filtering circuit module, for switch powering mode such as original as claimed in any one of claims 1 to 6
Side feedback switch power supply control chip；
It is connected between the power pins and Voltage Feedback pin of the primary side feedback Switching Power Supply control chip, for described
Primary side feedback Switching Power Supply controls the energy-storage module of chip power supply；
It is connected between the ground pin and Voltage Feedback pin of the primary side feedback Switching Power Supply control chip, it is described for detecting
The voltage sample module of Voltage Feedback pin voltage；And
It is connected between the ground pin and output loading of the primary side feedback Switching Power Supply control chip, the energy storage for energy storage becomes
Die block.
8. primary side feedback switching power control system as claimed in claim 7, which is characterized in that the energy-storage module includes storage
Energy capacitor, the first end of the storage capacitor is connect with the power pins of primary side feedback Switching Power Supply control chip, described
The second end of storage capacitor is connect with the Voltage Feedback pin of primary side feedback Switching Power Supply control chip.
9. primary side feedback switching power control system as claimed in claim 7, which is characterized in that the voltage sample module packet
Include 3rd resistor, the second end and the primary side feedback Switching Power Supply control of the first end of the 3rd resistor and the storage capacitor
The Voltage Feedback pin of coremaking piece connects altogether, and the second end of the 3rd resistor and the primary side feedback Switching Power Supply control chip
The connection of ground pin.
10. a kind of charger, which is characterized in that including the described in any item primary side feedback Switching Power Supply controls of claim 7 to 9
System.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109039112A (en) * | 2018-07-06 | 2018-12-18 | 深圳市富满电子集团股份有限公司 | A kind of primary side feedback Switching Power Supply control chip, control system and charger |
| CN109039112B (en) * | 2018-07-06 | 2024-05-17 | 富满微电子集团股份有限公司 | Primary side feedback switching power supply control chip, control system and charger |
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2018
- 2018-07-06 CN CN201821081664.5U patent/CN208571948U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109039112A (en) * | 2018-07-06 | 2018-12-18 | 深圳市富满电子集团股份有限公司 | A kind of primary side feedback Switching Power Supply control chip, control system and charger |
| CN109039112B (en) * | 2018-07-06 | 2024-05-17 | 富满微电子集团股份有限公司 | Primary side feedback switching power supply control chip, control system and charger |
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Address after: 518000 1701, building 1, Shenzhen new generation industrial park, 136 Zhongkang Road, Meidu community, Meilin street, Futian District, Shenzhen City, Guangdong Province Patentee after: Fuman microelectronics Group Co.,Ltd. Address before: 518000 18 / F, west area, Shidai science and technology building, nongyuan Road, Futian District, Shenzhen City, Guangdong Province Patentee before: SHENZHEN FUMAN ELECTRONIC GROUP Co.,Ltd. |
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