CN208209828U - Circuit of synchronous rectification - Google Patents
Circuit of synchronous rectification Download PDFInfo
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- CN208209828U CN208209828U CN201820535485.8U CN201820535485U CN208209828U CN 208209828 U CN208209828 U CN 208209828U CN 201820535485 U CN201820535485 U CN 201820535485U CN 208209828 U CN208209828 U CN 208209828U
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- synchronous rectification
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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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Abstract
The utility model relates to a kind of circuit of synchronous rectification, including power supply input circuit, the first transformer T1, synchronous rectification chip U1 and filtering output circuit, the first transformer T1 includes primary main coil, primary secondary coil and secondary output winding, the power supply input circuit is separately connected primary main coil and primary secondary coil, the secondary output winding connects synchronous rectification chip U1, and the U1 connection of synchronous rectification chip filters output circuit；Whereby, diode current flow loss is greatly reduced, replaces traditional Schottky diode, improves the delivery efficiency of integrated circuit, moreover, simplifying route, reduces circuit design cost, there is preferable economic benefit.
Description
Technical field
The utility model relates to a kind of field of power supplies, refer in particular to a kind of circuit of synchronous rectification.
Background technique
In existing inverse-excitation type switch power-supply, the rectifier diode loss of Circuit Fault on Secondary Transformer is the important shadow of power-efficient
One of the factor of sound, tradition are to alleviate this problem by selecting the Schottky diode of low conduction voltage drop.But conducting damage
Consumption is big, and the delivery efficiency of integrated circuit is low.
Therefore, in the utility model patent application, applicant has studied intensively a kind of circuit of synchronous rectification to solve
State problem.
Utility model content
For deficiency present in the above-mentioned prior art, main purpose is to provide a kind of synchronous rectification electricity the utility model
Road is greatly reduced diode current flow loss, replaces traditional Schottky diode, improve the delivery efficiency of integrated circuit, and
And simplify route, circuit design cost is reduced, there is preferable economic benefit.
To realize above-mentioned purpose, the utility model adopts the following technical scheme:
A kind of circuit of synchronous rectification, including power supply input circuit, the first transformer T1, synchronous rectification chip U1 and filtering are defeated
Circuit out, the first transformer T1 include primary main coil, primary secondary coil and secondary output winding, the power input electricity
Road is separately connected primary main coil and primary secondary coil, and the secondary output winding connects synchronous rectification chip U1, synchronous rectification
Chip U1 connection filters output circuit.
As a preferred embodiment, the power supply input circuit has first input end, the second input terminal and third input
End, the pin 2 of primary main coil connect first input end, and the pin 4 of primary main coil connects the second input terminal, primary secondary coil
Pin 5 connect third input terminal, the pin 6 of primary secondary coil is equipotential end；
The filtering output circuit includes polar capacitor C35, polar capacitor C26, capacitor C38 and cathode output end, secondary
The A pin of one end connection synchronous rectification chip U1 of output winding, the K pin of synchronous rectification chip U1 are separately connected polar capacitor
The anode and cathode output end of the anode of C26, polar capacitor C35, the other end of secondary output winding and polar capacitor C26's is negative
The cathode of pole and polar capacitor C35 are grounded jointly, and capacitor C38 is parallel to the both ends of polar capacitor C26.
As a preferred embodiment, the power supply input circuit includes standby power control circuit, the standby power control
The output signal that the first transformer of circuit connection T1 processed, the first transformer T1 receive standby power control circuit is defeated after handling
Out, the output signal that the synchronous rectification chip U1 receives the first transformer T1 exports after handling, and filtering output circuit receives same
Output+5V standby voltage after the output signal of step rectification chip U1.
As a preferred embodiment, the power supply input circuit further includes electric main input circuit, EMI circuit, bridge-type
Rectification module, PFC inductance, PFC-PWM controller, high pressure diode rectification module, high-voltage capacitance filter module, the second transformation
Device, the first rectification module, energy storage inductor, first capacitor inductor filter module, the first DC-DC converter, the 2nd DC-DC conversion
Device, the second capacitor and inductor filter module, first voltage controller, second voltage controller, protection IC module and VCC power supply mould
Block；
The electric main input circuit connects EMI circuit, EMI circuit connection bridge rectifier module, the bridge rectifier
Module connects PFC inductance, the PFC inductance connection high pressure diode rectification module, the high pressure diode rectification module connection
High-voltage capacitance filter module, the high-voltage capacitance filter module connect the second transformer, and the second transformer connection first is whole
Flow module, first rectification module connect energy storage inductor, the energy storage inductor be separately connected first capacitor inductor filter module,
First DC-DC converter, the second DC-DC converter and the second capacitor and inductor filter module, first capacitor inductor filter module
The voltage of output+12V, the first DC-DC converter receive the output of energy storage inductor after the output signal processing of reception energy storage inductor
The voltage of output+5V after signal processing, output+3.3V after the output signal that the second DC-DC converter receives energy storage inductor is handled
Voltage, the second capacitor and inductor filter module receive energy storage inductor output signal processing after output -12V voltage；
First capacitor inductor filter module, the first DC-DC converter, the second DC-DC converter, the filtering of the second capacitor and inductor
Module and filtering output circuit are all connected with protection IC module, and the protection IC module and standby power control circuit are all connected with
VCC power module, the protection IC module export PG signal and PS- after receiving the output signal processing from filtering output circuit
ON signal, the VCC power module connect PFC-PWM controller, and first capacitor inductor filter module is controlled by second voltage
Device connects PFC-PWM controller, and the PFC-PWM controller is separately connected high pressure diode rectification module and the second transformer；
High-voltage capacitance filter module is separately connected first voltage controller and the first transformer T1, and first voltage controller connects PFC-
PWM controller.
As a preferred embodiment, the filtering output circuit is connected with tertiary voltage controller, the tertiary voltage control
Device processed connects standby power control circuit.
The utility model has clear advantage and beneficial effect compared with prior art, specifically: whole by synchronizing
Chip U1 is flowed, diode current flow loss is greatly reduced, replaces traditional Schottky diode, improves the output effect of integrated circuit
Rate simplifies route moreover, synchronous rectification chip U1 is not necessarily to additional power supply circuit, reduces circuit design cost, has preferable
Economic benefit；And overall construction design is ingenious, each circuit performance is stable and safe and reliable.
For the structure feature and effect for more clearly illustrating the utility model, come with reference to the accompanying drawing with specific embodiment pair
It is described in detail.
Detailed description of the invention
Fig. 1 is the substantially control block diagram of the embodiment of the utility model；
Fig. 2 is the local circuit schematic diagram of the embodiment of the utility model；
Fig. 3 is the whole control block diagram applied to Switching Power Supply of the embodiment of the utility model.
Drawing reference numeral explanation:
10, power supply input circuit 20, filtering output circuit.
Specific embodiment
The utility model is further described with specific embodiment with reference to the accompanying drawing.
As shown in Figure 1 to Figure 3, a kind of circuit of synchronous rectification, power supply input circuit 10, the first transformer T1, synchronous rectification
Chip U1 and filtering output circuit 20, in which:
In the present embodiment, the model DK5V100R25C of the synchronous rectification chip U1 supports DCM, QR and CCM
Mode flyback system, the NMOS tube of built-in 25m Ω 100V power, meanwhile, distinctive confession power technology, without external power supply electricity
Source, and there is self-test to open shutdown, it is not necessarily to outer synchronous signal, EMI can be improved；
As shown in Fig. 2, the first transformer T1 includes primary main coil, primary secondary coil and secondary output winding,
In the present embodiment, the number of turns of primary main coil is 104T, and the number of turns of primary secondary coil is 23T, and the number of turns of secondary output winding is
6T；The power supply input circuit 10 is separately connected primary main coil and primary secondary coil, and the secondary output winding connection synchronizes
Rectification chip U1, the U1 connection of synchronous rectification chip filter output circuit 20；In the present embodiment, the power supply input circuit 10 has
There are first input end (VIN1 in such as Fig. 2), the second input terminal (VIN2 in such as Fig. 2) and third input terminal (in such as Fig. 2
VIN3), the pin 2 of primary main coil connects first input end, and the pin 4 of primary main coil connects the second input terminal, primary secondary
The pin 5 of coil connects third input terminal, and the pin 6 of primary secondary coil is equipotential end；
The filtering output circuit 20 includes polar capacitor C35, polar capacitor C26, capacitor C38 and cathode output end, secondary
The A pin of one end connection synchronous rectification chip U1 of grade output winding, the K pin of synchronous rectification chip U1 are separately connected polarity electricity
Hold the anode of C26, the anode and cathode output end of polar capacitor C35, the other end (i.e. pin 9) and polarity of secondary output winding
The cathode of capacitor C26 and the cathode of polar capacitor C35 are grounded jointly, and capacitor C38 is parallel to the both ends of polar capacitor C26；
Following standby power control circuits connect the first transformer T1, in the present embodiment, aforementioned standby power control electricity
Road has the first output end and second output terminal, and shown first output end is aforementioned second input terminal, and second output terminal is aforementioned
Third input terminal；The output signal that the first transformer T1 receives standby power control circuit exports after handling, the synchronization
The output signal that rectification chip U1 receives the first transformer T1 exports after handling, and filtering output circuit 20 receives synchronous rectification chip
Output+5V standby voltage after the output signal of U1, i.e. cathode output end output+5VSB voltage；Filtering output circuit 20 is connected with
Tertiary voltage controller, the tertiary voltage controller connect standby power control circuit.
As shown in figure 3, the power supply input circuit 10 includes electric main input circuit, EMI circuit, bridge rectifier mould
Block, PFC inductance, PFC-PWM controller, high pressure diode rectification module, high-voltage capacitance filter module, the second transformer, first
Rectification module, energy storage inductor, first capacitor inductor filter module, the first DC-DC converter, the second DC-DC converter, the second electricity
Hold inductor filter module, first voltage controller, second voltage controller, protection IC module, VCC power module and standby power
Control circuit；
The electric main input circuit connects EMI circuit, EMI circuit connection bridge rectifier module, the bridge rectifier
Module connects PFC inductance, the PFC inductance connection high pressure diode rectification module, the high pressure diode rectification module connection
High-voltage capacitance filter module, the high-voltage capacitance filter module connect the second transformer, and the second transformer connection first is whole
Flow module, first rectification module connect energy storage inductor, the energy storage inductor be separately connected first capacitor inductor filter module,
First DC-DC converter, the second DC-DC converter and the second capacitor and inductor filter module, first capacitor inductor filter module
The voltage of output+12V, the first DC-DC converter receive the output of energy storage inductor after the output signal processing of reception energy storage inductor
The voltage of output+5V after signal processing, output+3.3V after the output signal that the second DC-DC converter receives energy storage inductor is handled
Voltage, the second capacitor and inductor filter module receive energy storage inductor output signal processing after output -12V voltage；
First capacitor inductor filter module, the first DC-DC converter, the second DC-DC converter, the filtering of the second capacitor and inductor
Module and filtering output circuit 20 are all connected with protection IC module, and the protection IC module and standby power control circuit are all connected with
VCC power module, it is described protection IC module receive from filtering output circuit 20 output signal processing after output PG signal and
PS-ON signal, the VCC power module connect PFC-PWM controller, and first capacitor inductor filter module passes through second voltage control
Device processed connects PFC-PWM controller, and the PFC-PWM controller is separately connected high pressure diode rectification module and the second transformation
Device；High-voltage capacitance filter module is separately connected first voltage controller and the first transformer T1, the connection of first voltage controller
PFC-PWM controller；In the present embodiment, the third output end of high-voltage capacitance filter module is aforementioned first input end.
The utility model designing points are, mainly pass through synchronous rectification chip U1, diode current flow is greatly reduced
Loss, replaces traditional Schottky diode, improves the delivery efficiency of integrated circuit, moreover, synchronous rectification chip U1 is not necessarily to volume
Outer power supply circuit simplifies route, reduces circuit design cost, has preferable economic benefit；And overall construction design is skilful
Wonderful, each circuit performance is stable and safe and reliable.
The above is only the utility model preferred embodiment, not appoints to the technical scope of the utility model
What is limited, therefore any trickle amendment made by the above technical examples according to the technical essence of the present invention, equivalent variations
With modification, it is still within the scope of the technical solutions of the present invention.
Claims (6)
1. a kind of circuit of synchronous rectification, it is characterised in that: including power supply input circuit, the first transformer T1, synchronous rectification chip
U1 and filtering output circuit, the first transformer T1 includes primary main coil, primary secondary coil and secondary output winding, described
Power supply input circuit is separately connected primary main coil and primary secondary coil, and the secondary output winding connects synchronous rectification chip
U1, the U1 connection of synchronous rectification chip filter output circuit.
2. circuit of synchronous rectification according to claim 1, it is characterised in that: the power supply input circuit has the first input
End, the second input terminal and third input terminal, the pin 2 of primary main coil connect first input end, and the pin 4 of primary main coil connects
The second input terminal is connect, the pin 5 of primary secondary coil connects third input terminal, and the pin 6 of primary secondary coil is equipotential end；
The filtering output circuit includes polar capacitor C35, polar capacitor C26, capacitor C38 and cathode output end, secondary output
The A pin of one end connection synchronous rectification chip U1 of coil, the K pin of synchronous rectification chip U1 are separately connected polar capacitor C26
Anode, polar capacitor C35 anode and cathode output end, the other end of secondary output winding and the cathode of polar capacitor C26
It is grounded jointly with the cathode of polar capacitor C35, capacitor C38 is parallel to the both ends of polar capacitor C26.
3. circuit of synchronous rectification according to claim 1, it is characterised in that: the power supply input circuit includes standby power
Control circuit, the first transformer of the standby power control circuit connection T1, the first transformer T1 receive standby power control
It is exported after the output signal processing of circuit processed, after the synchronous rectification chip U1 receives the output signal processing of the first transformer T1
Output filters output+5V standby voltage after the output signal of output circuit reception synchronous rectification chip U1.
4. circuit of synchronous rectification according to claim 2, it is characterised in that: the power supply input circuit further includes exchange city
Electric input circuit, EMI circuit, bridge rectifier module, PFC inductance, PFC-PWM controller, high pressure diode rectification module, high pressure
Capacitor filtering module, the second transformer, the first rectification module, energy storage inductor, first capacitor inductor filter module, the first DC-DC
Converter, the second capacitor and inductor filter module, first voltage controller, second voltage controller, is protected at the second DC-DC converter
Protect IC module and VCC power module；
The electric main input circuit connects EMI circuit, EMI circuit connection bridge rectifier module, the bridge rectifier module
PFC inductance, the PFC inductance connection high pressure diode rectification module are connected, the high pressure diode rectification module connects high pressure
Capacitor filtering module, the high-voltage capacitance filter module connect the second transformer, the first rectification of the second transformer connection mould
Block, first rectification module connect energy storage inductor, and the energy storage inductor is separately connected first capacitor inductor filter module, first
DC-DC converter, the second DC-DC converter and the second capacitor and inductor filter module, first capacitor inductor filter module receive
The voltage of output+12V, the first DC-DC converter receive the output signal of energy storage inductor after the output signal processing of energy storage inductor
The voltage of output+5V after processing, the electricity of output+3.3V after the output signal that the second DC-DC converter receives energy storage inductor is handled
Pressure, the voltage of output -12V after the output signal that the second capacitor and inductor filter module receives energy storage inductor is handled；
First capacitor inductor filter module, the first DC-DC converter, the second DC-DC converter, the second capacitor and inductor filter module
And filtering output circuit is all connected with protection IC module, the protection IC module and standby power control circuit are all connected with VCC electricity
Source module, the protection IC module export PG signal and PS-ON letter after receiving the output signal processing from filtering output circuit
Number, the VCC power module connects PFC-PWM controller, and first capacitor inductor filter module is connected by second voltage controller
PFC-PWM controller is connect, the PFC-PWM controller is separately connected high pressure diode rectification module and the second transformer；High pressure
Capacitor filtering module is separately connected first voltage controller and the first transformer T1, and first voltage controller connects PFC-PWM control
Device processed.
5. circuit of synchronous rectification according to claim 3, it is characterised in that: the filtering output circuit is connected with third electricity
Pressure controller, the tertiary voltage controller connect standby power control circuit.
6. circuit of synchronous rectification according to claim 1, it is characterised in that: the model of the synchronous rectification chip U1
DK5V100R25C。
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820535485.8U CN208209828U (en) | 2018-04-16 | 2018-04-16 | Circuit of synchronous rectification |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820535485.8U CN208209828U (en) | 2018-04-16 | 2018-04-16 | Circuit of synchronous rectification |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN208209828U true CN208209828U (en) | 2018-12-07 |
Family
ID=64523226
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201820535485.8U Active CN208209828U (en) | 2018-04-16 | 2018-04-16 | Circuit of synchronous rectification |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN208209828U (en) |
-
2018
- 2018-04-16 CN CN201820535485.8U patent/CN208209828U/en active Active
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