CN107104585B - Control device, control method and the switch power supply system of Switching Power Supply - Google Patents
Control device, control method and the switch power supply system of Switching Power Supply Download PDFInfo
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- CN107104585B CN107104585B CN201610095245.6A CN201610095245A CN107104585B CN 107104585 B CN107104585 B CN 107104585B CN 201610095245 A CN201610095245 A CN 201610095245A CN 107104585 B CN107104585 B CN 107104585B
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- power supply
- switching power
- voltage
- overvoltage protection
- signal
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/32—Means for protecting converters other than automatic disconnection
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/02—Conversion of ac power input into dc power output without possibility of reversal
- H02M7/04—Conversion of ac power input into dc power output without possibility of reversal by static converters
- H02M7/12—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/21—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M7/217—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/32—Means for protecting converters other than automatic disconnection
- H02M1/325—Means for protecting converters other than automatic disconnection with means for allowing continuous operation despite a fault, i.e. fault tolerant converters
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Dc-Dc Converters (AREA)
Abstract
The invention discloses a kind of control device of Switching Power Supply, control method and switch power supply systems.The control device includes: generation module, for generating overvoltage protection signal when the output voltage of the primary side of the Switching Power Supply is greater than scheduled first voltage threshold value；Control module, the drive control circuit of the primary side for controlling the Switching Power Supply according to the overvoltage protection signal, so that the Switching Power Supply restarts.Control device and control method of the invention can be avoided the error as caused by the influence of transformer and feedback branch in primary sample mode, so as to more accurately realize the overvoltage protection to Switching Power Supply.
Description
Technical field
The present invention relates to electronic circuit fields, and in particular, to a kind of control device of Switching Power Supply, control method and opens
Close power-supply system.
Background technique
As the mainstream power supply plan of the mobile electronic devices such as mobile phone, laptop, Switching Power Supply has small in size, effect
The advantages that rate is high, constant pressure precision is high.As the energy, environment are cured in the development and field of power supplies of mobile electronic device technology
View is aggravated, more stringent requirements are proposed to working efficiency, no-load power consumption, safety, reliability etc. for Switching Power Supply of today, this
So that developer constantly improves chip controls method, expect that a kind of method for finding more advantage solves these and asks
Topic.
Synchronous rectification is the Metal-Oxide Semiconductor field effect transistor (Metal- extremely low using on state resistance
Oxide-Semiconductor Field-Effect Transistor, MOSFET), come replace Schottky barrier diodes with
Reduce a new technology of rectifier loss.It can greatly improve the efficiency of Switching Power Supply and there is no by Schottky barrier voltage
Dead zone voltage caused by and.
In synchronous rectifying switching power source, the mode by using primary sampling implements overvoltage protection to Switching Power Supply.In
In this primary sample mode, the voltage of sampling can inevitably introduce interference by the influence of transformer and feedback branch, cause out
The overvoltage protection in powered-down source is inaccurate, is easy to happen and accidentally protects, and safety, stability and the reliability of Switching Power Supply are insufficient.
Summary of the invention
The object of the present invention is to provide control device, controls that one kind can accurately carry out the Switching Power Supply of overvoltage protection
Method and switch power supply system.
To achieve the goals above, the present invention provides a kind of control device of Switching Power Supply.The control device includes: life
At module, for generating over-voltage when the output voltage of the primary side of the Switching Power Supply is greater than scheduled first voltage threshold value
Protect signal；Control module, the drive control of the primary side for controlling the Switching Power Supply according to the overvoltage protection signal
Circuit, so that the Switching Power Supply restarts.
Preferably, the generation module includes: the first comparison circuit, for by the output voltage and described scheduled the
One voltage threshold is compared, and when the output voltage is greater than the scheduled first voltage threshold value, is generated the over-voltage and is protected
Protect signal；First delay circuit, for the overvoltage protection signal to be delayed, so that the overvoltage protection signal is scheduled one
It is constantly exported in period.
Preferably, first comparison circuit includes: the divider resistance of at least two concatenations, at least two concatenation
The high voltage end of the one termination output voltage of divider resistance, other end ground connection；Comparator is concatenated with described at least two
The output end that divider resistance divides the output voltage connects, and the divider resistance for concatenating described at least two is defeated
Branch pressure voltage out is compared with scheduled second voltage threshold value, when the branch pressure voltage is greater than the scheduled second voltage
When threshold value, the overvoltage protection signal is generated.
Preferably, first comparison circuit further includes first switch tube and first resistor, and the comparator passes through first
Switching tube connects the first resistor, the first resistor be connected to the divider resistance of at least two concatenation the other end and
Between ground wire.
Preferably, the control device further include: discharge module, for generating the overvoltage protection in the generation module
When signal, discharge the output capacitance of the primary side of the Switching Power Supply.
Preferably, the discharge module includes second switch and second resistance, the second switch and described second
Resistance is serially connected between the anode and ground wire of the output capacitance.
Preferably, the overvoltage protection signal is transferred to the control module via the feedback winding of the Switching Power Supply.
Preferably, the control module includes: the second comparison circuit, for by the voltage signal of the feedback winding and in advance
Fixed tertiary voltage threshold value is compared, and generates pulsed logic signal；Second delay circuit is used for the drive control circuit
The master pulse signal of output is delayed, and generates mask logic signal；Logic circuit, for according to the mask logic signal
The pulsed logic signal is shielded with scheduled logical relation, pulsed logic signal after shielding indicates the feedback
When including the overvoltage protection signal in the voltage signal of winding, the drive control circuit is controlled, so that the switch is electric
Source restarting.
Preferably, the drive control circuit includes driving chip and third switching tube, the supply pin of the driving chip
The high voltage end and the feedback winding, the third switching tube for being separately connected the coil of the primary side are separately connected the drive
The low-voltage end of the coil of the output pin and primary side of dynamic chip, wherein the control module is used for according to the over-voltage
The output that protection signal controls the driving chip is closed.
The present invention also provides a kind of switch power supply system, the system comprises: Switching Power Supply；Control dress provided by the invention
It sets.
The present invention also provides a kind of control method of Switching Power Supply, the control method includes: when the Switching Power Supply
When the output voltage of primary side is greater than scheduled first voltage threshold value, overvoltage protection signal is generated；Believed according to the overvoltage protection
The drive control circuit of the primary side of number control Switching Power Supply, so that the Switching Power Supply restarts.
It is preferably, described when the output voltage of the primary side of the Switching Power Supply is greater than scheduled first voltage threshold value,
The step of generating overvoltage protection signal includes: to be compared the output voltage with the scheduled first voltage threshold value, when
When the output voltage is greater than the scheduled first voltage threshold value, the overvoltage protection signal is generated；By the overvoltage protection
Signal delay, so that the overvoltage protection signal constantly exports in a predetermined time section.
Preferably, the control method further include: time when generating the overvoltage protection signal, to the Switching Power Supply
The output capacitance of grade side is discharged.
Preferably, the overvoltage protection signal is transmitted via the feedback winding of the Switching Power Supply.
Preferably, the drive control electricity of the primary side that the Switching Power Supply is controlled according to the overvoltage protection signal
Road, so that the Switching Power Supply includes: by the voltage signal of the feedback winding and scheduled third electricity the step of restarting
Pressure threshold value is compared, and generates pulsed logic signal；The master pulse signal that the drive control circuit exports is delayed,
Generate mask logic signal；The pulsed logic signal is shielded according to the mask logic signal and scheduled logical relation
It covers, pulsed logic signal after shielding indicates that in the voltage signal of the feedback winding include the overvoltage protection signal
When, the drive control circuit is controlled, so that the Switching Power Supply restarts.
Through the above technical solutions, the output voltage of primary side is directly acquired in Switching Power Supply, it is big in the output voltage
When scheduled threshold value, the drive control circuit of the primary side of control switch power supply, so that Switching Power Supply restarts.Therefore,
Control device and control method of the invention can be avoided in primary sample mode to be caused by the influence of transformer and feedback branch
Error, so as to more accurately realize the overvoltage protection to Switching Power Supply.
Other features and advantages of the present invention will the following detailed description will be given in the detailed implementation section.
Detailed description of the invention
The drawings are intended to provide a further understanding of the invention, and constitutes part of specification, with following tool
Body embodiment is used to explain the present invention together, but is not construed as limiting the invention.In the accompanying drawings:
Fig. 1 is the structural block diagram of the control device for the Switching Power Supply that an illustrative embodiments provide；
Fig. 2 is the structural block diagram for the generation module that an illustrative embodiments provide；
Fig. 3 is the circuit diagram for the first comparison circuit that an illustrative embodiments provide；
Fig. 4 is the circuit diagram for the first comparison circuit that another exemplary embodiment provides；
Fig. 5 is the circuit diagram of the control device for the Switching Power Supply that an illustrative embodiments provide；
Fig. 6 is the structural block diagram for the control module that an illustrative embodiments provide；
Fig. 7 is the logic timing figure for the control module that an illustrative embodiments provide；
Fig. 8 is the schematic diagram for the drive control circuit that an illustrative embodiments provide；
Fig. 9 is the flow chart of the control method for the Switching Power Supply that an illustrative embodiments provide；
Figure 10 is the flow chart for the generation overvoltage protection signal that an illustrative embodiments provide；
Figure 11 is the flow chart of the control method for the Switching Power Supply that another exemplary embodiment provides；And
Figure 12 is the flow chart of the drive control circuit for the control primary side that an illustrative embodiments provide.
Specific embodiment
Below in conjunction with attached drawing, detailed description of the preferred embodiments.It should be understood that this place is retouched
The specific embodiment stated is merely to illustrate and explain the present invention, and is not intended to restrict the invention.
Fig. 1 is the structural block diagram of the control device for the Switching Power Supply that an illustrative embodiments provide.As shown in Figure 1, institute
Stating control device may include generation module 11 and control module 12.
Generation module 11 can be used for being greater than scheduled first voltage threshold value when the output voltage of the primary side of Switching Power Supply
When, generate overvoltage protection signal.Control module 12 can be used for according to the primary side of overvoltage protection signal control switch power supply
Drive control circuit, so that Switching Power Supply restarts.
Wherein, Switching Power Supply can be synchronous rectifying switching power source.The synchronous rectifying switching power source usually may include collection
At primary side, drive the synchronous rectifying switching power source work normally drive control circuit, and be integrated in primary side,
MOSFET for controlling primary side synchronizes the synchronous commutating control circuit of rectification.The control of Switching Power Supply of the invention fills
Setting, which can be used in, carries out overvoltage protection to synchronous rectifying switching power source.
Specifically, generation module 11 can be connect with the output end of primary side, and obtain the output voltage of primary side.When obtaining
When the output voltage got is greater than scheduled first voltage threshold value, overvoltage protection signal is can be generated in generation module 11.Wherein,
One voltage threshold can be voltage safe for the load of primary side.It is, if output voltage is greater than the first electricity
Threshold value is pressed, it may be considered that the output voltage is dangerous to the load of primary side.Generation module 11 transmits overvoltage protection signal
To control module 12, to control the drive control circuit of primary side, Switching Power Supply restarting by control module 12.For example,
The logic output that can control shutdown drive control circuit, closes the supply pin power down of drive control circuit to enabled, then
Re-power starting.The step of specifically how controlling restarting Switching Power Supply will be described in detail in part herein below.
Through the above technical solutions, the output voltage of primary side is directly acquired in Switching Power Supply, it is big in the output voltage
When scheduled threshold value, the drive control circuit of the primary side of control switch power supply, so that Switching Power Supply restarts.Therefore,
Control device of the invention can be avoided the error as caused by the influence of transformer and feedback branch in primary sample mode, thus
It can more accurately realize the overvoltage protection to Switching Power Supply.
Fig. 2 is the structural block diagram for the generation module 11 that an illustrative embodiments provide.As shown in Fig. 2, generation module 11
It may include the first comparison circuit 111 and the first delay circuit 112.
First comparison circuit 111 can be used for for output voltage being compared with scheduled first voltage threshold value, work as output
When voltage is greater than scheduled first voltage threshold value, overvoltage protection signal is generated.First delay circuit 112 can be used for protecting over-voltage
Signal delay is protected, so that overvoltage protection signal constantly exports in a predetermined time section.
Wherein, the first comparison circuit 111 can be implemented with comparator.When output voltage is greater than first voltage threshold value,
Comparator overturning, exports such as high level logic (overvoltage protection signal).In the embodiment, the first delay circuit 112 is utilized
Overvoltage protection signal is delayed and is exported, control module 12 can be transferred to overvoltage protection signal in this way and provide time guarantee (especially
It is using it is transformer coupled to transmit signal when).
Fig. 3 is the circuit diagram for the first comparison circuit 111 that an illustrative embodiments provide.As shown in figure 3, first compares
Circuit 111 may include the divider resistance (in Fig. 3 by taking two divider resistances R1, R2 as an example) and comparator of at least two concatenations
CMP_1。
The high voltage end V of a termination output voltage of divider resistance R1, R2 of at least two concatenationsOUT+, other end ground connection.
Divider resistance R1, R2 of at least two concatenations export branch pressure voltage for dividing to output voltage, to comparator CMP_1.
The output end that divider resistance R1, R2 that comparator CMP_1 is concatenated at least two divide output voltage is (between R1 and R2
Electrical node) connection, can be used for the branch pressure voltage and scheduled the of divider resistance R1, R2 output of at least two concatenations
Two voltage threshold REF_2 are compared, and when branch pressure voltage is greater than scheduled second voltage threshold value REF_2, generate overvoltage protection
Signal.
In the embodiment, is realized according to voltage divider principle and convert small voltage for the detection of the big voltage of output voltage
Detection.That is, branch pressure voltage can be set to when branch pressure voltage is greater than scheduled second voltage threshold value REF_2, output voltage is big
In scheduled first voltage threshold value.
Fig. 4 is the circuit diagram for the first comparison circuit 111 that another exemplary embodiment provides.As shown in figure 4, in Fig. 3
On the basis of, the first comparison circuit 111 can also include first switch tube M3 (being shown in Fig. 4 with MOSFET pipe) and first resistor
R3.Comparator CMP_1 passes through first switch tube M3 connection first resistor R3.First resistor R3 is connected to point of at least two concatenations
Between the other end and ground wire of piezoresistance RI, R2.First switch tube M3 is used in comparator CMP_1 output over-voltage protection signal
Conducting, so that first resistor R3 short circuit.It can speed up and compare by first switch tube M3 and first resistor R3 in the embodiment
The overturning of device CMP_1, while realizing sluggish overvoltage protection.
Preferably, overvoltage protection signal can be transferred to control module 12 via the feedback winding of Switching Power Supply.Fig. 5 is one
The circuit diagram of the control device for the Switching Power Supply that illustrative embodiments provide.In embodiment shown in Fig. 5, with ACDC
For the Switching Power Supply 20 of (exchange turns direct current).Wherein, the alternating current of input passes through diode D1, D2, D5, D4 full-wave rectification
Afterwards, then through capacitor C2, C3 and inductance L1 the π type filter circuit formed is converted to high voltage direct current.L2 and L3 is respectively primary side
Coil and primary side coil.Switching tube M1 is used for synchronous rectification, and capacitor C1 is the output capacitance of primary side.
It is also shown in Fig. 5 positioned at the feedback winding L4 of primary side and for the normal work of control switch power supply 20
Drive control circuit DRV.In order to protrude technical solution of the present invention, the drive control circuit DRV in primary side is eliminated in Fig. 5
Physical circuit figure and physical circuit figure with synchronous commutating control circuit in the connection relationship and primary side of some components
And the connection relationship with other component.
As shown in figure 5, in generation module 11, the overvoltage protection signal that comparator CMP_1 is generated, by the first delay electricity
The delay of road DELAY_1, lasting output to switching tube M1 within a predetermined period of time, so that switching tube M1 conducting a period of time.
Overvoltage protection signal is transmitted to the feedback winding of transformer via the coil L2 of switching tube M1, the coil L3 of primary side, primary side
L4.At this point, containing the feedback voltage letter when synchronous rectifying switching power source works normally in the voltage signal of feedback winding L4
Number and the two pulse signals of overvoltage protection signal.Control module 12 can be connect with feedback winding L4, detect feedback winding L4
Voltage signal in whether include overvoltage protection signal, when detecting overvoltage protection signal, the primary of control switch power supply
The drive control circuit DRV of side, so that Switching Power Supply restarts.Control module 12 is described in detail below.
Fig. 6 is the structural block diagram for the control module 12 that an illustrative embodiments provide.As shown in fig. 6, control module 12
It may include the second comparison circuit 121, the second delay circuit 122 and logic circuit 123.
Second comparison circuit 121 can be used for carrying out the voltage signal of feedback winding L4 and scheduled tertiary voltage threshold value
Compare, generates pulsed logic signal.Second delay circuit 122 can be used for the master pulse signal for exporting drive control circuit
It is delayed, generates mask logic signal.Logic circuit 123 can be used for according to mask logic signal and scheduled logical relation
Pulsed logic signal is shielded, includes in the voltage signal of pulsed logic signal expression feedback winding L4 after shielding
When overvoltage protection signal, control control drive control circuit, so that Switching Power Supply restarts.
Back to Fig. 5, in the embodiment for the control module 12 being shown in FIG. 5, the second comparison circuit 121 includes comparing
Device CMP_2, comparator CMP_2 can also be by the way of comparing branch pressure voltage, and comparator CMP_2 is by feedback winding L4 through resistance
The branch pressure voltage exported after R5, R6 partial pressure is compared with reference voltage REF_3.Wherein, which can be set to
When the branch pressure voltage is greater than reference voltage REF_3, the voltage of feedback winding L4 is greater than scheduled tertiary voltage threshold value.
In addition, control device can also include discharge module.The discharge module can be used for generating in generation module 11
When pressure protection signal, discharge the output capacitance C1 of the primary side of Switching Power Supply 20.
Specifically, as shown in figure 5, discharge module 13 may include second switch M2 and second resistance R4, second switch
Pipe M2 and second resistance R4 can be serially connected between the anode and ground wire of output capacitance C1.Second switch M2 is used to generate mould
Block 11 is connected when generating overvoltage protection signal, so that the anode of output capacitance C1 is grounded by second resistance R4.Wherein, the second electricity
Resistance R4 can play the role of current limliting.
In the embodiment, discharge module 13 discharges to output capacitance C1 by the way of pull-down circuit, Neng Goufang
It is only damaged caused by the excessively high element in Switching Power Supply 20 of output voltage, to improve the safety of Switching Power Supply 20.
Fig. 7 is the logic timing figure for the control module 12 that an illustrative embodiments provide.Below in conjunction with logic timing figure
To describe the working principle of control module 12.By taking the voltage signal of feedback winding L4 includes overvoltage protection signal as an example, such as Fig. 7
It is shown, the voltage pulse signal VFB that comparator CMP_2 is received from divider resistance R5, R6 carry feedback voltage signal and
Overvoltage protection signal.Wherein, feedback voltage signal be Switching Power Supply in normal work, feedback arrive feedback winding L4 voltage arteries and veins
Rush signal.Voltage pulse signal VFB is compared with reference voltage REF_3 in comparator CMP_2, generates pulsed logic signal
OUT_CMP.Meanwhile second delay circuit DELAY_2 receive drive control circuit DRV output master pulse signal PULSE it is (anti-
Feedthrough voltage signal is to feed back the electricity formed into feedback winding L4 after drive control circuit DRV exports master pulse signal PULSE
Press signal), PULSE signal is delayed a period of time, output shielding logical signal OUT_DEL.Pulsed logic signal OUT_CMP and
Mask logic signal OUT_DEL is entered in logic circuit 123 (to show with logic gate AND in Fig. 5), and logic circuit 123
It is masked in pulsed logic signal OUT_CMP according to the logical relation (for example, with relationship) of setting and represents feedback voltage signal
Pulse.If in the voltage signal of feedback winding L4 including overvoltage protection signal, in the output signal OVP of logic circuit 123
It still include the high level signal (as shown in Figure 7) for indicating overvoltage protection signal.That is, by pulsed logic signal OUT_CMP
It also include the signal of predetermined level, then it is assumed that feedback winding L4's after the middle pluse shielding for representing feedback voltage signal falls
It include overvoltage protection signal in voltage signal.
From the above mentioned, when not including overvoltage protection signal in the voltage signal of feedback winding L4, logic circuit 123 is for example
Low level can be exported, the drive control circuit for controlling primary side works normally.When including in the voltage signal of feedback winding L4
When overvoltage protection signal, logic circuit 123 can for example export high level, control the drive control circuit DRV of primary side, so that
Switching Power Supply restarting.
The drive control circuit DRV of control primary side described in detail below, so that the process of Switching Power Supply restarting.Figure
8 be the schematic diagram for the drive control circuit DRV that an illustrative embodiments provide.As shown in figure 8, drive control circuit DRV can
To include driving chip IC and third switching tube M4.The supply pin VDD of driving chip IC is separately connected the coil L2's of primary side
High voltage end (for example, passing through resistance R3) and feedback winding L4 (for example, passing through diode D6).Third switching tube M4 is (with three poles
Pipe is shown) it is separately connected the low-voltage end of the output pin OUT of driving chip IC and the coil L2 of primary side.Wherein, control module
12 outputs that can be used for controlling driving chip IC according to overvoltage protection signal are closed.
Specifically, in embodiment shown in Fig. 8, when Switching Power Supply starts to start work, driving chip IC can be with
It receives the small voltage in the coil L2 of primary side and starts, receive the big voltage cut-out electricity fed back in feedback winding L4 later
Source works normally.Control module 12 can control driving chip IC and close output, then feed back when receiving overvoltage protection signal
It is gradually reduced to the voltage in feedback winding L4, when the voltage in feedback winding L4 is reduced to insufficient for driving chip IC just
Often when work, the enabled power down of driving chip IC, driving chip IC is started by the small voltage in the coil L2 of primary side again,
Switching Power Supply restarts at this time.
It is understood that in specific implementation, generation module 11 and discharge module 13 can be with the secondary of Switching Power Supply
The synchronous commutating control circuit of side is integrated in a chip.Control module 12 can be with the driving control of the primary side of Switching Power Supply
Circuit DRV processed is integrated in a chip.Modules of the invention and existing drive control circuit DRV and synchronous whole
Interconnected relationship of flow control circuit when specific integrated is that those skilled in the art are readily able to expect, not in this
It is described in detail again.
The present invention also provides including a kind of switch power supply system, which includes Switching Power Supply and above-mentioned control device.
The present invention also provides a kind of control methods of Switching Power Supply.Fig. 9 is the switch electricity that an illustrative embodiments provide
The flow chart of the control method in source.As shown in figure 9, the control method includes the following steps.
In step s 11, it when the output voltage of the primary side of Switching Power Supply is greater than scheduled first voltage threshold value, generates
Overvoltage protection signal.
In step s 12, according to the drive control circuit of the primary side of overvoltage protection signal control switch power supply, so that opening
Powered-down source restarting.
Figure 10 is the flow chart for the generation overvoltage protection signal that an illustrative embodiments provide.As shown in Figure 10, when opening
The output voltage of the primary side in powered-down source be greater than scheduled first voltage threshold value when, generate overvoltage protection signal the step of (step
S11 it) may comprise steps of.
In step S111, output voltage is compared with scheduled first voltage threshold value, when output voltage is greater than in advance
When fixed first voltage threshold value, overvoltage protection signal is generated.
In step S112, overvoltage protection signal is delayed, so that overvoltage protection signal is held in a predetermined time section
It exports continuously.
Figure 11 is the flow chart of the control method for the Switching Power Supply that another exemplary embodiment provides.As shown in figure 11,
On the basis of Fig. 9, the control method is further comprising the steps of.
In step s 13, when generating overvoltage protection signal, the output capacitance of the primary side of Switching Power Supply is put
Electricity.
Preferably, overvoltage protection signal is transmitted via the feedback winding of Switching Power Supply.
Figure 12 is the flow chart of the drive control circuit for the control primary side that an illustrative embodiments provide.Such as Figure 12 institute
Show, according to the drive control circuit of the primary side of overvoltage protection signal control switch power supply, so that Switching Power Supply restarted
Step (step S12) may comprise steps of.
In step S121, the voltage signal of feedback winding is compared with scheduled tertiary voltage threshold value, generates arteries and veins
Rush logical signal.
In step S122, the master pulse signal that drive control circuit exports is delayed, generates mask logic letter
Number.
In step S123, pulsed logic signal is shielded according to mask logic signal and scheduled logical relation,
When including overvoltage protection signal in the voltage signal that the pulsed logic signal after shielding indicates feedback winding, control driving control
Circuit processed, so that Switching Power Supply restarts.
About the control method in above embodiment, wherein each step executes the concrete mode of operation related
The embodiment of the control circuit is described in detail, and no detailed explanation will be given here.
Through the above technical solutions, the output voltage of primary side is directly acquired in Switching Power Supply, it is big in the output voltage
When scheduled threshold value, the drive control circuit of the primary side of control switch power supply, so that Switching Power Supply restarts.Therefore,
Control method of the invention can be avoided the error as caused by the influence of transformer and feedback branch in primary sample mode, thus
It can more accurately realize the overvoltage protection to Switching Power Supply.
It is described the prefered embodiments of the present invention in detail above in conjunction with attached drawing, still, the present invention is not limited to above-mentioned realities
The detail in mode is applied, within the scope of the technical concept of the present invention, a variety of letters can be carried out to technical solution of the present invention
Monotropic type, these simple variants all belong to the scope of protection of the present invention.
It is further to note that specific technical features described in the above specific embodiments, in not lance
In the case where shield, it can be combined in any appropriate way.In order to avoid unnecessary repetition, the present invention to it is various can
No further explanation will be given for the combination of energy.
In addition, various embodiments of the present invention can be combined randomly, as long as it is without prejudice to originally
The thought of invention, it should also be regarded as the disclosure of the present invention.
Claims (11)
1. a kind of control device of Switching Power Supply, the control device include:
Generation module, for giving birth to when the output voltage of the primary side of the Switching Power Supply is greater than scheduled first voltage threshold value
At overvoltage protection signal, wherein coil, switch electricity of the overvoltage protection signal via the primary side of the Switching Power Supply
The feedback winding of the coil of the primary side in source, the Switching Power Supply, is transferred to control module；
The control module, the drive control electricity of the primary side for controlling the Switching Power Supply according to the overvoltage protection signal
Road, so that the Switching Power Supply restarts,
Wherein, the control module includes:
Second comparison circuit, it is raw for the voltage signal of the feedback winding to be compared with scheduled tertiary voltage threshold value
At pulsed logic signal；
Second delay circuit, the master pulse signal for exporting the drive control circuit are delayed, and generate shielding and patrol
Collect signal；
Logic circuit, for being shielded according to the mask logic signal and scheduled logical relation to the pulsed logic signal
It covers, pulsed logic signal after shielding indicates that in the voltage signal of the feedback winding include the overvoltage protection signal
When, the drive control circuit is controlled, so that the Switching Power Supply restarts.
2. control device according to claim 1, which is characterized in that the generation module includes:
First comparison circuit, for the output voltage to be compared with the scheduled first voltage threshold value, when described defeated
When voltage is greater than the scheduled first voltage threshold value out, the overvoltage protection signal is generated；
First delay circuit, for the overvoltage protection signal to be delayed, so that the overvoltage protection signal is when one is scheduled
Between constantly export in section.
3. control device according to claim 2, which is characterized in that first comparison circuit includes:
The divider resistance of at least two concatenations, the height of a termination output voltage of the divider resistance of at least two concatenation
Voltage end, other end ground connection；
Comparator, the output end divided with the divider resistance of at least two concatenation to the output voltage connect, use
It is compared in by the branch pressure voltage for the divider resistance output that described at least two concatenate with scheduled second voltage threshold value, works as institute
When stating branch pressure voltage greater than the scheduled second voltage threshold value, the overvoltage protection signal is generated.
4. control device according to claim 3, which is characterized in that first comparison circuit further includes first switch tube
And first resistor, the comparator connect the first resistor by first switch tube, the first resistor be connected to it is described extremely
Between the other end and ground wire of the divider resistance of few two concatenations.
5. control device according to claim 1, which is characterized in that the control device further include:
Discharge module is used for when the generation module generates the overvoltage protection signal, to the primary side of the Switching Power Supply
Output capacitance discharge.
6. control device according to claim 5, which is characterized in that the discharge module includes second switch and second
Resistance, the second switch and the second resistance are serially connected between the anode and ground wire of the output capacitance.
7. control device according to claim 1, which is characterized in that the drive control circuit includes driving chip and
Three switching tubes, the supply pin of the driving chip be separately connected the coil of the primary side high voltage end and it is described feedback around
Group, the third switching tube are separately connected the low-voltage end of the output pin of the driving chip and the coil of the primary side,
In, the output that the control module is used to control the driving chip according to the overvoltage protection signal is closed.
8. a kind of switch power supply system, the system comprises:
Switching Power Supply；
Control device described in any claim in claim 1-7.
9. a kind of control method of Switching Power Supply, the control method include:
When the output voltage of the primary side of the Switching Power Supply is greater than scheduled first voltage threshold value, overvoltage protection letter is generated
Number, the overvoltage protection signal via the coil of the primary side of the Switching Power Supply, the coil of the primary side of the Switching Power Supply,
It is transferred to the feedback winding of the Switching Power Supply；
The voltage signal of the feedback winding is compared with scheduled tertiary voltage threshold value, generates pulsed logic signal；
The master pulse signal that drive control circuit exports is delayed, mask logic signal is generated；
The pulsed logic signal is shielded according to the mask logic signal and scheduled logical relation, after shielding
When pulsed logic signal indicates to include the overvoltage protection signal in the voltage signal of the feedback winding, the driving is controlled
Control circuit, so that the Switching Power Supply restarts.
10. control method according to claim 9, which is characterized in that the primary side when the Switching Power Supply it is defeated
Out voltage be greater than scheduled first voltage threshold value when, generate overvoltage protection signal the step of include:
The output voltage is compared with the scheduled first voltage threshold value, when the output voltage is greater than described make a reservation for
First voltage threshold value when, generate the overvoltage protection signal；
The overvoltage protection signal is delayed, so that the overvoltage protection signal constantly exports in a predetermined time section.
11. control method according to claim 9, which is characterized in that the control method further include:
When generating the overvoltage protection signal, discharge the output capacitance of the primary side of the Switching Power Supply.
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| CN201610095245.6A CN107104585B (en) | 2016-02-19 | 2016-02-19 | Control device, control method and the switch power supply system of Switching Power Supply |
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| CN201610095245.6A CN107104585B (en) | 2016-02-19 | 2016-02-19 | Control device, control method and the switch power supply system of Switching Power Supply |
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| CN107104585B true CN107104585B (en) | 2019-11-05 |
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| CN109818328B (en) * | 2019-03-19 | 2020-09-11 | 浪潮商用机器有限公司 | Overvoltage protection circuit of switching power supply |
| CN112701926B (en) * | 2021-01-12 | 2022-04-15 | 飞依诺科技(苏州)有限公司 | Flyback switching power supply, control method thereof and ultrasonic equipment |
Citations (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7616464B2 (en) * | 2005-08-16 | 2009-11-10 | Astec International Limited | Reverse current control system for a power converter |
| CN101728958A (en) * | 2008-11-03 | 2010-06-09 | 成都芯源系统有限公司 | Method and control device for controlling isolated converter by tail current |
| CN101873755A (en) * | 2009-04-24 | 2010-10-27 | 松下电工株式会社 | Discharge lamp ignition device, supply unit and ligthing paraphernalia |
| CN102195495A (en) * | 2010-03-03 | 2011-09-21 | 比亚迪股份有限公司 | Switch power control circuit and switch power |
| CN102271442A (en) * | 2010-06-01 | 2011-12-07 | 登丰微电子股份有限公司 | Driving circuit and control circuit for light emitting diode |
| CN102684499A (en) * | 2011-03-08 | 2012-09-19 | 登丰微电子股份有限公司 | Full-bridge conversion circuit and full-bridge drive control circuit |
| CN103326584A (en) * | 2012-03-20 | 2013-09-25 | 英飞凌科技奥地利有限公司 | Power converter with reduced power consumption in standby mode |
| CN104201895A (en) * | 2013-03-14 | 2014-12-10 | 戴乐格半导体公司 | Powering synchronous rectifier controller |
| CN104320085A (en) * | 2014-11-18 | 2015-01-28 | 中国兵器工业集团第二一四研究所苏州研发中心 | Low-temperature-excursion CMOS oscillator circuit |
| CN204180017U (en) * | 2014-11-18 | 2015-02-25 | 中国兵器工业集团第二一四研究所苏州研发中心 | Low Drift Temperature CMOS pierce circuit |
| CN104600994A (en) * | 2014-12-24 | 2015-05-06 | 高信勇 | Primary side control circuit for isolation conversion circuit |
| CN104734510A (en) * | 2013-12-20 | 2015-06-24 | 比亚迪股份有限公司 | Switch power supply and control chip thereof |
| CN105322799A (en) * | 2014-06-04 | 2016-02-10 | 通嘉科技股份有限公司 | Dummy Load Controllers and Control Methods |
-
2016
- 2016-02-19 CN CN201610095245.6A patent/CN107104585B/en active Active
Patent Citations (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7616464B2 (en) * | 2005-08-16 | 2009-11-10 | Astec International Limited | Reverse current control system for a power converter |
| CN101728958A (en) * | 2008-11-03 | 2010-06-09 | 成都芯源系统有限公司 | Method and control device for controlling isolated converter by tail current |
| CN101873755A (en) * | 2009-04-24 | 2010-10-27 | 松下电工株式会社 | Discharge lamp ignition device, supply unit and ligthing paraphernalia |
| CN102195495A (en) * | 2010-03-03 | 2011-09-21 | 比亚迪股份有限公司 | Switch power control circuit and switch power |
| CN102271442A (en) * | 2010-06-01 | 2011-12-07 | 登丰微电子股份有限公司 | Driving circuit and control circuit for light emitting diode |
| CN102684499A (en) * | 2011-03-08 | 2012-09-19 | 登丰微电子股份有限公司 | Full-bridge conversion circuit and full-bridge drive control circuit |
| CN103326584A (en) * | 2012-03-20 | 2013-09-25 | 英飞凌科技奥地利有限公司 | Power converter with reduced power consumption in standby mode |
| CN104201895A (en) * | 2013-03-14 | 2014-12-10 | 戴乐格半导体公司 | Powering synchronous rectifier controller |
| CN104734510A (en) * | 2013-12-20 | 2015-06-24 | 比亚迪股份有限公司 | Switch power supply and control chip thereof |
| CN105322799A (en) * | 2014-06-04 | 2016-02-10 | 通嘉科技股份有限公司 | Dummy Load Controllers and Control Methods |
| CN104320085A (en) * | 2014-11-18 | 2015-01-28 | 中国兵器工业集团第二一四研究所苏州研发中心 | Low-temperature-excursion CMOS oscillator circuit |
| CN204180017U (en) * | 2014-11-18 | 2015-02-25 | 中国兵器工业集团第二一四研究所苏州研发中心 | Low Drift Temperature CMOS pierce circuit |
| CN104600994A (en) * | 2014-12-24 | 2015-05-06 | 高信勇 | Primary side control circuit for isolation conversion circuit |
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|---|---|
| CN107104585A (en) | 2017-08-29 |
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Effective date of registration: 20191231 Address after: 518119 1 Yanan Road, Kwai Chung street, Dapeng New District, Shenzhen, Guangdong Patentee after: SHENZHEN BYD MICROELECTRONICS Co.,Ltd. Address before: BYD 518118 Shenzhen Road, Guangdong province Pingshan New District No. 3009 Patentee before: BYD Co.,Ltd. |
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Address after: 518119 No.1 Yan'an Road, Kuiyong street, Dapeng New District, Shenzhen City, Guangdong Province Patentee after: BYD Semiconductor Co.,Ltd. Address before: 518119 No.1 Yan'an Road, Kuiyong street, Dapeng New District, Shenzhen City, Guangdong Province Patentee before: BYD Semiconductor Co.,Ltd. Address after: 518119 No.1 Yan'an Road, Kuiyong street, Dapeng New District, Shenzhen City, Guangdong Province Patentee after: BYD Semiconductor Co.,Ltd. Address before: 518119 No.1 Yan'an Road, Kuiyong street, Dapeng New District, Shenzhen City, Guangdong Province Patentee before: SHENZHEN BYD MICROELECTRONICS Co.,Ltd. |