CN110855151A - Positive and negative excitation type switching power supply circuit and control method thereof - Google Patents
Positive and negative excitation type switching power supply circuit and control method thereof Download PDFInfo
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- CN110855151A CN110855151A CN201911174669.1A CN201911174669A CN110855151A CN 110855151 A CN110855151 A CN 110855151A CN 201911174669 A CN201911174669 A CN 201911174669A CN 110855151 A CN110855151 A CN 110855151A
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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
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
- H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
- H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
- H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
- H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/33569—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having several active switching elements
- H02M3/33576—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having several active switching elements having at least one active switching element at the secondary side of an isolation transformer
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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
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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
- H02M1/36—Means for starting or stopping converters
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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
- H02M1/0048—Circuits or arrangements for reducing losses
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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
- H02M1/0048—Circuits or arrangements for reducing losses
- H02M1/0054—Transistor switching losses
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
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- Power Engineering (AREA)
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Abstract
The invention discloses a forward and reverse excitation type switching power supply circuit and a control method thereof, which are applied to a boosting occasion with output voltage far higher than input voltage, and the output voltage can be adjusted. The MOS tube is used as a control switch and is realized under the control of a control circuit: when the forward and reverse excitation type switching power supply circuit outputs a short circuit or the output voltage is low, the MOS tube is disconnected, so that the whole circuit works in a flyback state, and the short circuit power consumption and the output efficiency are greatly reduced; when the output voltage of the forward and reverse excitation type switching power supply circuit is higher, the MOS tube is conducted, so that the whole circuit works in a forward and reverse excitation state, the voltage stress of the power tube of the whole circuit is reduced, the device selection is facilitated, and the efficiency of the whole machine is further improved.
Description
Technical Field
The invention relates to the field of switching power supplies, in particular to a forward and reverse excitation type switching power supply circuit and a control method thereof.
Background
At present, a high-voltage constant-current charging converter is used in many fields, and the converter is generally realized by the following two schemes in the market today:
1. the flyback basic topology is applied to the field of outputting high-voltage low power, and the purpose of high output voltage is achieved by increasing the output voltage in a multi-winding mode or forming multi-stage voltage-multiplying rectification through a capacitor and a diode;
2. the output voltage is raised by adopting the forward-flyback topology shown in fig. 1 through the bootstrap principle of the capacitor C1.
However, both schemes have certain limitations, and a flyback topology is adopted, and a mode of rectifying by multiple windings and then outputting in series is equivalent to a mode that multiple flyback outputs are connected in series, so that the higher the output voltage is, the more windings are needed, the requirement on the size of the transformer is a challenge, and in addition, the pin pitch of the transformer needs to be further increased, so that the size of the whole transformer is larger; the mode of adopting electric capacity and diode voltage doubling is only suitable for the application that the electric current is less again, will be restricted to the occasion that the output current is great, and adopt the scheme of forward and backward excitation topology, although energy transmission efficiency is higher, the structure of transformer is also simpler, only need a winding just can output very high voltage, but have a fatal defect, will appear the condition that efficiency sharply drops, the loss of primary side switch tube sharply increases when outputting short circuit or output voltage is less than the secondary side winding voltage, influence the performance and the reliability of complete machine product. Particularly for a product with constant current source output, hiccup protection can not occur in the case of short circuit, the short circuit is considered to be that the output voltage is equal to the forward voltage drop of a rectifier diode, at this time, the circuit working in a forward state can reversely charge capacitors C1 and C2, the secondary winding of the transformer T1 can be always clamped at a negative voltage, a large current can be formed in the flyback working state, the duration is long, and the loss of a magnetic core and a primary side switching tube is increased sharply. The method comprises the following specific steps:
when the switching tube Q1 is turned on, the primary side 2 end of the transformer T1 is positive, and the primary side 1 end is negative, and this time belongs to a forward path, and then transfers energy to the secondary side while exciting the primary side of the transformer T1, because the primary side 1 end and the secondary side 3 end of the transformer T1 are dotted ends, and the path of secondary side energy transmission is that current flowing from the 3 end of the transformer T1 flows through the capacitor C1, the diode D3, the capacitor C3, and the capacitor C2 to return to the 4 end of the transformer T1 to form a forward loop, three capacitors are charged, and the output voltage starts to be established. At this time, the capacitor C1 and the capacitor C2 are both in the negative-down state. When the primary side switching tube Q1 is in an off state, voltages at two ends of the transformer T1 deflect, and a voltage induced to the secondary side of the transformer T1 also deflects, so that the end 4 is positive, and the end 3 is negative, but voltages of the capacitors C1 and C2 are charged in a reverse direction of the forward loop, so that the capacitors C1 and C2 need to be discharged at the beginning of the flyback loop, and then the reverse charging is performed, a large current is formed at this time, so that loss is increased, the output voltage is established slowly, and the startup time is long. This is also one of the drawbacks of this existing topology;
after a plurality of cycles of charging, the voltages of the capacitor C1 and the capacitor C2 are in a positive-negative state, and the flyback loop charges the capacitor C1 through the diode D1, charges the capacitor C2 through the diode D2, and charges the capacitor C3 through the diode D1, the diode D3 and the diode D2 when the primary switch Q1 is turned off. When the primary side switching tube Q1 is turned on, the forward loop is turned on, and the primary side energy reversely charges the secondary side capacitors C1 and C2 through the transformer T1. The output voltage at this time is equal to the sum of the three voltages of the capacitor C1, the capacitor C1, and the secondary winding voltage. When the output voltage is higher than the voltage on the secondary winding of the transformer T1, the voltages of the capacitors C1 and C2 do not present a positive-up negative state, the current generated by forward excitation is smaller, the loss is smaller, when the output is short-circuited or the output voltage is lower than the winding voltage, the forward loop lasts longer, the current on the primary side of the refraction transformer T1 is larger, the duration is longer, the loss is larger, and the fatal defect of the existing forward-flyback circuit can not be short-circuited or the lower voltage is output.
Disclosure of Invention
Therefore, the technical problem to be solved by the invention is to provide a forward and reverse excitation type switching power supply circuit and a control method thereof, which are applied to the boosting occasion that the output voltage is far higher than the input voltage.
The invention conception of the invention is as follows:
a new control logic is provided for the forward and reverse excitation circuit topology of the existing transformer, and the fatal defect of the existing circuit is fundamentally overcome. The fundamental reason that the forward and backward excitation circuit of the transformer has large loss in a short circuit state or a low output voltage state is that a forward excitation path exists. The idea of the invention is to disconnect the forward path when the output voltage is short-circuited or lower than the winding voltage, as shown in fig. 2, a MOS transistor Q2 is connected in series in the forward charging loop, when the output voltage is short-circuited or lower, the MOS transistor Q2 is disconnected, and then the forward/reverse flyback circuit becomes a pure normal flyback circuit, the diode D1 and the capacitor C1 form a flyback output rectifying loop, and the diode D3, the diode D2 and the capacitor C3 form another flyback loop. The primary side switching tube Q1 is not stressed as the output voltage is low. In addition, in the starting process, the output voltage starts to rise from zero, so that the common flyback circuit starts to be used, the starting capability is enhanced, and the starting time is greatly shortened. After the output voltage reaches a certain value, the MOS tube Q2 in the forward path is opened, and the circuit is changed into a forward and reverse circuit, so that the starting capability of the control logic is improved, and the problems of short circuit or low output voltage and high power consumption are solved. The stress on the primary side switching tube Q1 is not influenced.
For the new control logic, the invention is realized by using a control chip or a unit control circuit with the MOS tube floating drive function.
The invention is realized by the following technical scheme:
a forward and reverse excitation type switching power supply circuit is applied to the boosting occasion that the output voltage is far higher than the input voltage, and comprises a primary side circuit, a transformer T1 and a secondary side circuit, wherein the secondary side circuit specifically comprises a diode D1, a diode D2, a diode D3, a capacitor C1, a capacitor C2 and a capacitor C3; the end 1 of the primary winding of the transformer T1 and the end 3 of the secondary winding of the transformer T1 are the same-name ends, the end 4 of the secondary winding of the transformer T1 is connected with one end of a capacitor C2 and the anode of a diode D1, the other end of a capacitor C2 is connected with the anode of a diode D2, the cathode of a diode D2 is connected with the end 3 of the secondary winding of the transformer T1, the cathode of a diode D1 is electrically connected with one end of a capacitor C1 and the anode of a diode D3, the other end of a capacitor C1 is connected with the end 3 of the secondary winding of the transformer T1, the cathode of a diode D3 is connected with one end of a capacitor C3, and the other end of a capacitor C3 is connected with the connection point of the other end of the capacitor C63. The circuit further comprises a MOS tube Q2 and a control circuit, wherein the source electrode of the MOS tube Q2 is connected with the cathode of the diode D1, and the drain electrode of the MOS tube Q2 is connected with one end of the capacitor C1.
Preferably, the MOS transistor Q2 is an NPN type MOS transistor.
As a specific configuration and connection manner of the control circuit, the control circuit includes a secondary side second winding of the transformer T1, a capacitor C4, a capacitor C5, a diode D4, a resistor R1, a resistor R2, and a drive control chip IC 1.
Preferably, the driving control chip IC1 is a control chip or a unit control circuit with MOS floating drive function, and includes a sampling signal input terminal (HIN), a floating drive reference port (HB), a floating drive voltage supply port (VB), a driving output port (HO), a ground reference port (GND), and a power supply port (VCC);
one end of the resistor R1 is an input end of the control circuit, the driving output port (HO) is an output end of the control circuit, and the power supply port (VCC) is connected with an external power supply voltage VCC; the other end of the resistor R1 is connected with one end of a resistor R2, one end of a capacitor C5 and a sampling signal input port (HIN); the 5 end of the secondary side second winding of the transformer T1 and the 1 end of the primary side winding of the transformer T1 are the same-name ends, the 6 end of the secondary side second winding of the transformer T1 is connected with a floating drive reference port (HB) of a drive control chip IC1 and is connected with the source of a MOS tube Q2 and one end of a capacitor C4, the other end of the capacitor C4 is connected with the cathode of a diode D4 and a floating drive voltage supply port (VB), and the anode of the diode D4 is connected with the 5 end of the secondary side second winding of the transformer T1; the other end of the resistor R2, the other end of the capacitor C5 and a reference ground port (GND) are connected with the output end and the ground reference.
Preferably, the driving control chip IC1 is a control chip or a cell control circuit having a MOS transistor floating drive function.
The invention also provides a control method suitable for any one of the forward and reverse excitation type switching power supply circuits, which comprises the following steps:
the output voltage of the forward and reverse excitation type switching power supply circuit is sampled by using a resistor, the sampled signal is filtered and then input to a sampling signal input port (HIN) of a drive control chip IC1, and the drive control chip IC1 controls whether a drive output port (HO) outputs a drive signal according to the level of the sampling signal, so that the on and off of an MOS transistor Q2 are controlled.
As a specific implementation process of the above steps, the resistor R1 and the resistor R2 sample the voltage across the capacitor C3, that is, the output voltage of the forward-flyback switching power supply circuit, and the sampled signal is filtered by the capacitor C5 and then input to the sampling signal input port (HIN) of the driving control chip IC 1;
meanwhile, the voltage on the secondary side second winding of the transformer T1 is rectified by a diode D4 and a capacitor C4, and then is input to a floating drive voltage supply port (VB) of a drive control chip IC1 to be used as the voltage of a drive signal; a floating drive reference port (HB) of the drive control chip IC1 is used as a floating drive reference point of the MOS transistor Q2, and a drive output port (HO) of the drive control chip IC1 provides a drive signal for the MOS transistor Q2;
when a low level signal smaller than a first set value is input into a sampling signal input port (HIN) of the drive control chip IC1, the drive control chip IC1 does not output a drive signal, and the MOS tube Q2 is turned off at the moment, so that the reverse charging of the capacitor C1 and the capacitor C2 by the secondary side first winding of the transformer T1 is effectively prevented, and the condition that the loss of the primary side transformer and the loss of the MOS tube are increased sharply is avoided;
when a high level signal larger than a second set value is input into a sampling signal input port (HIN) of the drive control chip IC1, the drive control chip IC1 starts to output a drive signal, at this time, the MOS transistor Q2 is turned on, the circuit is changed into a forward-flyback topology, and the output voltage is greatly increased.
As a set of values suitable for a specific circuit, the first set value is 1.4V, and the second set value is 2.3V.
Interpretation of terms:
electrically coupling: the connection mode includes direct or indirect connection, and also includes connection modes such as inductive coupling, for example, the connection mode is a direct connection mode when "one end of the capacitor C1 is electrically connected to the cathode of the diode D1", and the connection mode belongs to indirect connection mode when the MOS transistor Q2 is connected between the cathode of the diode D1 and one end of the capacitor C1.
Compared with the prior art, the invention has the following beneficial effects:
1. a novel forward and flyback circuit topology is provided, a single circuit topology is switched into two circuit topologies, a specific implementation scheme is provided, the two topologies can be flexibly switched according to actual requirements, the problem is solved by applying a common flyback topology when the voltage is low, the forward and flyback topology is adopted when the output voltage is high, and the problems of poor starting and large short-circuit power consumption caused by the original forward and flyback circuit are solved.
2. The switching logic of the two topologies is clear and simple, only one MOS tube Q2 and a control circuit for controlling the MOS tube Q2 are added in the forward loop, the fatal defect of the existing forward and backward excitation circuit is overcome through the control logic, the performance and the reliability of the product are improved, the advantages of the flyback topology and the forward and backward excitation topology are ingeniously reflected, and the product popularization is easier to realize.
Drawings
Fig. 1 is a conventional forward and reverse excitation type switching power supply circuit;
fig. 2 is a schematic diagram of an embodiment of the present invention.
Detailed Description
Fig. 2 shows a schematic diagram of a flyback switching power supply circuit of the present invention, which is applied to a high-voltage constant-current converter, and mainly adds a MOS transistor Q2 and a corresponding control circuit to a flyback loop to control the timing of opening a flyback path.
The specific idea is as follows: a switch tube Q2 is connected in series in a forward charging loop, when the output voltage is short-circuited or low, the switch tube Q2 is disconnected, then the forward and reverse exciting circuit becomes a pure common flyback circuit, a flyback output rectifying loop is formed by a diode D1 and a capacitor C1, and another flyback loop is formed by a diode D3, a diode D2 and a capacitor C3. The primary side switching tube Q1 is not stressed as the output voltage is low. In addition, in the starting process, the output voltage starts to rise from zero, so that the common flyback circuit starts to be used, the starting capability is enhanced, and the starting time is greatly shortened. After the output voltage reaches a certain value, the switch tube Q2 in the forward path is opened, and the circuit becomes a forward and reverse circuit.
In order that those skilled in the art will better understand the present invention, the following description will proceed with reference being made to specific examples.
DETAILED DESCRIPTION OF EMBODIMENT (S) OF INVENTION
Fig. 2 shows a schematic diagram of an embodiment of the present invention, including a primary circuit, a transformer T1, and a secondary circuit. The primary side circuit comprises a switching tube Q1, the drain electrode of the switching tube Q1 is connected with the 2 end of the primary side winding of the transformer T1, and the source electrode of the switching tube Q1 is grounded.
The secondary side circuit specifically comprises a diode D1, a diode D2, a diode D3, a capacitor C1, a capacitor C2, a capacitor C3, a MOS tube Q2, a diode D5 and a control circuit, wherein the diode D5 is a body diode of a switching tube Q2.
The 1 end of the primary winding of the transformer T1, the 3 end of the secondary side first winding of the transformer T1 and the 5 end of the secondary side second winding of the transformer T1 are homonymous ends, the 4 end of the secondary side winding of the transformer T1 is connected with one end of a capacitor C2 and the anode of a diode D1, the other end of the capacitor C2 is connected with the anode of a diode D2, the cathode of a diode D68692 is connected with the 3 end of the secondary side winding of the transformer T1, the cathode of a diode D1 is connected with the source of a MOS tube Q2 and the anode of a diode D3, the drain of the MOS tube Q2 is connected with one end of a capacitor C1, the other end of the capacitor C1 is connected with the 3 end of the secondary side winding of the transformer T1, the cathode of the diode D3 is connected with one end of the capacitor C3, and the other end of the capacitor C3 is connected with the connection.
The control circuit comprises a secondary side second winding of a transformer T1, a capacitor C4, a capacitor C5, a diode D4, a resistor R1, a resistor R2 and a drive control chip IC1, wherein the drive control chip IC1 is a control chip with a MOS tube floating drive function and comprises a sampling signal input port (HIN), a floating drive reference port (HB), a floating drive voltage supply port (VB), a drive output port (HO), a reference ground port (GND) and a power supply port (VCC).
One end of the resistor R1 is an input end of the control circuit, the driving output port (HO) is an output end of the control circuit, and the power supply port (VCC) is connected with an external power supply voltage VCC; the other end of the resistor R1 is connected with one end of a resistor R2, one end of a capacitor C5 and a sampling signal input port (HIN); the 5 end of the secondary side second winding of the transformer T1 and the 1 end of the primary side winding of the transformer T1 are the same-name ends, the 6 end of the secondary side second winding of the transformer T1 is connected with a floating drive reference port (HB) of a drive control chip IC1 and is connected with the source of a MOS tube Q2 and one end of a capacitor C4, the other end of the capacitor C4 is connected with the cathode of a diode D4 and a floating drive voltage supply port (VB), and the anode of the diode D4 is connected with the 5 end of the secondary side second winding of the transformer T1; the other end of the resistor R2, the other end of the capacitor C5 and a reference ground port (GND) are connected with the output end and the ground reference.
The working principle of the embodiment is as follows:
in the control circuit, a resistor R1 and a resistor R2 form a sampling resistor, the voltage on a capacitor C3, namely the output voltage of the flyback switching power supply circuit, is sampled, a sampling signal is filtered by the capacitor C5 and then input to a sampling signal input port (HIN) of a drive control chip IC1, meanwhile, the voltage on a secondary side second winding of a transformer T1 is rectified by a diode D4 and a capacitor C4 and then input to a floating drive voltage supply port (VB) of the drive control chip IC1 as the voltage of a drive signal, a floating drive reference port (HB) of the drive control chip IC1 is connected with the source of a MOS transistor Q2 and is used as a reference point of the floating drive of the MOS transistor Q2, and a drive output port (HO) of the drive control chip IC1 is responsible for providing the drive signal for the MOS transistor Q2.
When the output of the forward and reverse excitation type switching power supply circuit is short-circuited or the output voltage is low, the voltage on the sampling resistor R2 is low, a low-level signal of 0-1.4V is input into a sampling input port (HIN) of the drive control chip IC1 at the moment, and the drive control chip IC1 does not output a drive signal, so that the MOS tube Q2 is turned off at the moment, the reverse charging of the capacitor C1 and the capacitor C2 by a primary side first winding of the transformer T1 is effectively prevented, and the condition that the loss of the transformer and the primary side MOS tube Q1 is increased rapidly is avoided;
when the output voltage of the forward and reverse excitation type switching power supply circuit is high enough, namely a high level signal larger than 2.3V is input into a sampling input port (HIN) of the drive control chip IC1, the drive control chip IC1 starts to output a drive signal, at the moment, the MOS transistor Q2 is conducted, the circuit is changed into a forward and reverse excitation topology, and the output voltage is greatly increased.
Through the simple control logic, the problem of solving by using the common flyback topology when the voltage is lower is solved, and the problems of poor starting and large short-circuit power consumption caused by the original flyback circuit are solved by adopting the ideal state of the flyback topology to boost the voltage when the output voltage is higher.
The above is a specific embodiment of the present invention, it should be noted that the above specific embodiment should not be considered as a limitation to the present invention, and it will be apparent to those skilled in the art that several modifications and embellishments can be made without departing from the spirit and scope of the present invention, such as modification of the same name terminal of the transformer T1, modification of the driving control chip into a unit circuit with similar function, and the like, and the modifications and embellishments of all circuits for realizing this function should also be considered as the protection scope of the present invention, and the protection scope of the present invention should be subject to the scope defined by the claims.
Claims (7)
1. A forward and reverse excitation type switching power supply circuit is applied to the boosting occasion that the output voltage is far higher than the input voltage, and comprises a primary side circuit, a transformer T1 and a secondary side circuit, wherein the secondary side circuit specifically comprises a diode D1, a diode D2, a diode D3, a capacitor C1, a capacitor C2 and a capacitor C3; the end 1 of the primary winding of the transformer T1 and the end 3 of the secondary winding of the transformer T1 are the same-name ends, the end 4 of the secondary winding of the transformer T1 is connected with one end of a capacitor C2 and the anode of a diode D1, the other end of a capacitor C2 is connected with the anode of a diode D2, the cathode of a diode D2 is connected with the end 3 of the secondary winding of the transformer T1, the cathode of a diode D1 is electrically connected with one end of a capacitor C1 and the anode of a diode D3, the other end of a capacitor C1 is connected with the end 3 of the secondary winding of the transformer T1, the cathode of a diode D3 is connected with one end of a capacitor C3, and the other end of a capacitor C3 is connected with the connection point of the other end of a capacitor C2 and the anode: the power supply also comprises an MOS tube Q2 and a control circuit, wherein the source electrode of the MOS tube Q2 is connected with the cathode of the diode D1, and the drain electrode of the MOS tube Q2 is connected with one end of the capacitor C1; the input end of the control circuit is connected with one end of the capacitor C3, and the output end of the control circuit is connected with the grid electrode of the MOS tube Q2.
2. A flyback switching power supply circuit according to claim 1, characterized in that: the MOS transistor Q2 is an NPN type MOS transistor.
3. A flyback switching power supply circuit according to claim 1, characterized in that: the control circuit comprises a secondary side second winding of the transformer T1, a capacitor C4, a capacitor C5, a diode D4, a resistor R1, a resistor R2 and a driving control chip IC 1;
the driving control chip IC1 comprises a sampling signal input port (HIN), a floating drive reference port (HB), a floating drive voltage supply port (VB), a driving output port (HO), a reference ground port (GND) and a power supply port (VCC);
one end of the resistor R1 is an input end of the control circuit, the driving output port (HO) is an output end of the control circuit, and the power supply port (VCC) is connected with an external power supply voltage VCC; the other end of the resistor R1 is connected with one end of a resistor R2, one end of a capacitor C5 and a sampling signal input port (HIN); the 5 end of the secondary side second winding of the transformer T1 and the 1 end of the primary side winding of the transformer T1 are the same-name ends, the 6 end of the secondary side second winding of the transformer T1 is connected with a floating drive reference port (HB) of a drive control chip IC1 and is connected with the source of a MOS tube Q2 and one end of a capacitor C4, the other end of the capacitor C4 is connected with the cathode of a diode D4 and a floating drive voltage supply port (VB), and the anode of the diode D4 is connected with the 5 end of the secondary side second winding of the transformer T1; the other end of the resistor R2, the other end of the capacitor C5 and a reference ground port (GND) are connected with the output end and the ground reference.
4. A flyback switching power supply circuit according to claim 3, characterized in that: the driving control chip IC1 is a control chip or a unit control circuit with MOS transistor floating driving function.
5. The control method of a flyback switching power supply circuit according to any one of claims 1 to 4, characterized by comprising the steps of:
the output voltage of the forward and reverse excitation type switching power supply circuit is sampled by using a resistor, the sampled signal is filtered and then input to a sampling signal input port (HIN) of a drive control chip IC1, and the drive control chip IC1 controls whether a drive output port (HO) outputs a drive signal according to the level of the sampling signal, so that the on and off of an MOS transistor Q2 are controlled.
6. The method for controlling a flyback switching power supply according to claim 4, wherein the steps are specifically implemented as follows:
the resistor R1 and the resistor R2 sample the voltage on the capacitor C3, namely the output voltage of the forward and reverse excitation type switching power supply circuit, and the sampled signal is filtered by the capacitor C5 and then input to a sampling signal input port (HIN) of the drive control chip IC 1;
meanwhile, the voltage on the secondary side second winding of the transformer T1 is rectified by a diode D4 and a capacitor C4, and then is input to a floating drive voltage supply port (VB) of a drive control chip IC1 to be used as the voltage of a drive signal; a floating drive reference port (HB) of the drive control chip IC1 is used as a floating drive reference point of the MOS transistor Q2, and a drive output port (HO) of the drive control chip IC1 provides a drive signal for the MOS transistor Q2;
when a low level signal smaller than a first set value is input into a sampling signal input port (HIN) of the drive control chip IC1, the drive control chip IC1 does not output a drive signal, and the MOS tube Q2 is turned off at the moment, so that the reverse charging of the capacitor C1 and the capacitor C2 by a secondary side first winding of the transformer T1 is effectively prevented, and the condition that the loss of the transformer and a primary side MOS tube is increased rapidly is avoided;
when a high level signal larger than a second set value is input into a sampling signal input port (HIN) of the drive control chip IC1, the drive control chip IC1 starts to output a drive signal, at this time, the MOS transistor Q2 is turned on, the circuit is changed into a forward-flyback topology, and the output voltage is greatly increased.
7. The method according to claim 6, wherein the step of controlling the flyback switching power supply comprises the steps of: the first set value is 1.4V, and the second set value is 2.3V.
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| CN201911174669.1A CN110855151B (en) | 2019-11-26 | 2019-11-26 | Positive and negative excitation type switching power supply circuit and control method thereof |
| PCT/CN2020/128671 WO2021104047A1 (en) | 2019-11-26 | 2020-11-13 | Forward-flyback switching power supply circuit and control method therefor |
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| CN112054684A (en) * | 2020-08-12 | 2020-12-08 | 北京卫星制造厂有限公司 | Ultrahigh-voltage aerospace switch power supply circuit topological structure |
| WO2021104047A1 (en) * | 2019-11-26 | 2021-06-03 | 广州金升阳科技有限公司 | Forward-flyback switching power supply circuit and control method therefor |
| CN114024455A (en) * | 2021-11-10 | 2022-02-08 | 深圳康佳电子科技有限公司 | Television and power circuit and power output control method thereof |
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| CN114400620B (en) * | 2022-01-04 | 2023-08-08 | 青岛鼎信通讯股份有限公司 | Flyback architecture input underovervoltage protection circuit applied to power industry |
| CN114945226B (en) * | 2022-07-25 | 2022-10-21 | 广东东菱电源科技有限公司 | Low standby power consumption circuit |
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| WO2021104047A1 (en) | 2021-06-03 |
| CN110855151B (en) | 2020-12-18 |
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