CN203457062U - Power converter with self-excited synchronous rectification circuit - Google Patents
Power converter with self-excited synchronous rectification circuit Download PDFInfo
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- CN203457062U CN203457062U CN201320235867.6U CN201320235867U CN203457062U CN 203457062 U CN203457062 U CN 203457062U CN 201320235867 U CN201320235867 U CN 201320235867U CN 203457062 U CN203457062 U CN 203457062U
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- 238000004146 energy storage Methods 0.000 description 3
- 239000002184 metal Substances 0.000 description 3
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Abstract
The utility model discloses a power converter with auto-excitation synchronous rectification circuit, the auto-excitation synchronous rectification circuit that sets up in this power converter need not additionally to add and just can function by oneself with the relevant peripheral circuit of control. Therefore, the self-excited synchronous rectification circuit provided in the power converter of the present invention not only can improve the overall efficiency of the power converter, but also can reduce the cost of the power converter. In addition, the utility model discloses well all power switches of auto-excitation synchronous rectification circuit form for the preparation of the face of weld that the surface mounting device directly glues at printed circuit board, not only make power converter's circuit board is small, but also can improve the problem of the long-pending heat of high temperature component gathering.
Description
Technical field
The utility model relates to a kind of power supply switch technology, and particularly relevant for a kind of power supply changeover device with auto-excitation type circuit of synchronous rectification.
Background technology
The framework of more common power supply changeover device (power converter) can be forward type (forward) or inverse-excitation type (flyback) now, but no matter be forward type or flyback power supply transducer, its rectification circuit (rectification circuit) that is arranged on the secondary side of transformer is all implemented with rectification diode (rectification diode) mostly.Yet, because rectification diode can produce sizable conduction loss (conduction loss) in conducting when closing, to such an extent as to the power loss of applied power supply changeover device (power loss) is understood increase, thereby affected the whole efficiency of the power supply changeover device of being applied.
In view of this, the circuit of synchronous rectification being comprised of power switch (power switch) (synchronous rectification circuit, SR circuit) has replaced (diode) rectification circuit that traditional forward type or flyback power supply converter inside are arranged on the secondary side of transformer gradually.Because the conduction loss causing during arbitrary power switch conducting in circuit of synchronous rectification is lower, to such an extent as to the power loss of applied power supply changeover device can reduce, thereby increases the whole efficiency of the power supply changeover device of being applied.
The type of drive of circuit of synchronous rectification (SR circuit) roughly has independent-excited (externally-driven) and auto-excitation type (self-driven) two classes now.With the type of drive of independent-excited, must in power supply changeover device, design extraly one independently control circuit (control circuit) to produce control signal, control the running of each power switch in circuit of synchronous rectification.In addition, with the type of drive of auto-excitation type, must increase extraly at the secondary side of transformer one group of ancillary coil (auxiliary winding) is controlled each power switch in circuit of synchronous rectification running to produce control signal.
Yet, no matter be independent-excited or the type of drive of auto-excitation type, all must set up extraly and control relevant peripheral circuit to control the running of each power switch in circuit of synchronous rectification.Thus, will the cost of power supply changeover device be increased.
On the other hand, in tradition auto-excitation type circuit of synchronous rectification, each power switch is all configured on the component side of printed circuit board (PCB) with the component type of plug-in type encapsulation (DIP), and its three pins (PIN) are inserted into the solder side of printed circuit board (PCB) via the boring on the component side of printed circuit board (PCB), and see through the mode of molten tin welding and relevant element (such as the secondary side of transformer, the passive device of energy storage etc.) connection.With this understanding, because each power switch in auto-excitation type circuit of synchronous rectification can produce high temperature when operating, therefore for avoiding overheated damage of power switch running, mostly can lock/stick (ㄇ font) fin at the back side of each power switch to dispel the heat now.Thus, be subject to the effect of altitude of the fin locking/stick, it is large that the circuit board volume of the power supply changeover device of being applied to cause becomes.
In addition, in general auto-excitation type circuit of synchronous rectification all power switchs mostly can be configured in the same area on the component side of printed circuit board (PCB) and be gathered in transformer near.With this understanding, so many high-temperature components are gathered on the component side of printed circuit board (PCB), are also very easy to cause the problem of accumulated heat.
Utility model content
In view of this, the utility model provides a kind of power supply changeover device with auto-excitation type circuit of synchronous rectification, and it,, without setting up extraly and controlling relevant peripheral circuit and just can operate voluntarily, can reduce the cost of the power supply changeover device of being applied.In addition, because all power switchs of auto-excitation type circuit of synchronous rectification are SMD element, therefore all power switchs adhere on the solder side of printed circuit board (PCB), not only make the circuit board volume of the power supply changeover device applied little, and can improve the problem of the accumulated heat of high-temperature components gathering.
The utility model provides a kind of power supply changeover device, and it comprises printed circuit board (PCB), transformer, and auto-excitation type circuit of synchronous rectification.Printed circuit board (PCB) has component side and solder side.Transformer configuration, on the component side of printed circuit board (PCB), and has primary side and the first secondary side.Auto-excitation type circuit of synchronous rectification comprises the SMD power switch on a plurality of solders side that directly adhere to printed circuit board (PCB), and the first secondary side of first's connection transformer of described a plurality of SMD power switches.
In an embodiment of the present utility model, the SMD power switch of described first comprises: the first SMD power switch and the second SMD power switch.Wherein, the first end of the first SMD power switch couples the Same Name of Ends of the first secondary side of transformer, and the control end of the first SMD power switch is coupled to a first node.The first end of the second SMD power switch couples the different name end of the first secondary side of transformer, the second end of the second SMD power switch couples the second end of the first SMD power switch, and the control end of the second SMD power switch is coupled to a Section Point.
In an embodiment of the present utility model, transformer also has the second secondary side, and the second secondary side of the second portion connection transformer of described a plurality of SMD power switches.With this understanding, the SMD power switch of described second portion comprises: the 3rd SMD power switch and the 4th SMD power switch.Wherein, the first end of the 3rd SMD power switch couples the Same Name of Ends of the second secondary side of transformer, and the control end of the 3rd SMD power switch is coupled to described first node.The first end of the 4th SMD power switch couples the different name end of the second secondary side of transformer, the second end of the 4th SMD power switch couples the second end of the 3rd SMD power switch, and the control end of the 4th SMD power switch is coupled to described Section Point.
In an embodiment of the present utility model, transformer also has the 3rd secondary side, and the 3rd secondary side of the third part connection transformer of described a plurality of SMD power switches.With this understanding, the SMD power switch of described third part comprises: the 5th SMD power switch and the 6th SMD power switch.Wherein, the first end of the 5th SMD power switch couples the Same Name of Ends of the 3rd secondary side of transformer, and the control end of the 5th SMD power switch is coupled to described first node.The first end of the 6th SMD power switch couples the different name end of the 3rd secondary side of transformer, the second end of the 6th SMD power switch couples the second end of the 5th SMD power switch, and the control end of the 6th SMD power switch is coupled to described Section Point.
In an embodiment of the present utility model, described first node is coupled to the different name end of the second secondary side of transformer, and described Section Point is coupled to the Same Name of Ends of the first secondary side of transformer.
Particularly, described power supply changeover device also comprises an input stage, and in order to receive an input voltage, wherein, this primary side couples this input stage, and reacts at least one control signal and receive this input voltage from this input stage.
In an embodiment of the present utility model, described at least one control signal comprises a single control signal, this input stage is a monocrystalline input stage, and this monocrystalline input stage comprises one the 7th power switch, and its first end couples the Same Name of Ends of this primary side, and its second end is coupled to an earthing potential, its control end is in order to receive this single control signal, wherein, the different name end of this primary side is in order to receive this input voltage, and this single control signal is a pulse-width modulation signal.
In an embodiment of the present utility model, this second SMD power switch, the 4th SMD power switch and the 6th SMD power switch and the only synchronously conducting according to the activation of this pulse-width modulation signal of the 7th power switch; And this first SMD power switch, the 3rd SMD power switch and the only synchronously conducting according to the forbidden energy of this pulse-width modulation signal of the 5th SMD power switch.
In an embodiment of the present utility model, described at least one control signal comprises one first control signal and one second control signal, this first control signal and this second control signal are respectively a pulse-width modulation signal, this input stage is a twin crystal input stage, and this twin crystal input stage comprises one the 7th power switch and one the 8th power switch, its first end is in order to receive this input voltage, its second end distinctly couples different name end and the Same Name of Ends of this primary side, and its control end distinctly receives this first control signal and this second control signal.
In an embodiment of the present utility model, this the second SMD power switch, the 4th SMD power switch and the 6th SMD power switch, and the 7th power switch and the 8th power switch only react on the activation of this pulse-width modulation signal and synchronously conducting; And this first SMD power switch, the 3rd SMD power switch and the 5th SMD power switch only react on the forbidden energy of this pulse-width modulation signal and synchronously conducting.
In an embodiment of the present utility model, described power supply changeover device also comprises one first output stage, one second output stage and one the 3rd output stage, the first end of the first output stage and this second SMD power switch and the second end also connect, and in order to react on this input voltage and this primary side, produce one first power supply with one first number of turns ratio of this first secondary side; The first end of the second output stage and the 4th SMD power switch and the second end also connect, and in order to react on this input voltage and this primary side, produce a second source with one second number of turns ratio of this second secondary side; The first end of the 3rd output stage and the 6th SMD power switch and the second end also connect, and in order to react on this input voltage and this primary side, produce one the 3rd power supply with one the 3rd number of turns ratio of the 3rd secondary side.
In an embodiment of the present utility model, described power supply changeover device also comprises one first clamp circuit, one second clamp circuit, one the 3rd clamp circuit, the first clamp circuit comprises one first pair of back-to-back voltage stabilizing didoe, and be connected across between the Same Name of Ends and different name end of this first secondary side, in order to the voltage of this first secondary side is carried out to clamp; The second clamp circuit comprises a diode and the electric capacity being serially connected, and is connected across between the Same Name of Ends and different name end of this second secondary side, in order to the voltage of this second secondary side is carried out to clamp; The 3rd clamp circuit, comprises one second pair of back-to-back voltage stabilizing didoe, and is connected across between the Same Name of Ends and different name end of the 3rd secondary side, in order to the voltage of the 3rd secondary side is carried out to clamp.
Based on above-mentioned, the utility model in power supply changeover device set auto-excitation type circuit of synchronous rectification without setting up extraly and controlling relevant peripheral circuit and just can operate voluntarily.Thus, the utility model set auto-excitation type circuit of synchronous rectification in power supply changeover device not only can be promoted the whole efficiency of power supply changeover device, but also can reduce the cost of power supply changeover device.In addition, all power switchs that the utility model is associated with auto-excitation type circuit of synchronous rectification change to be made as SMD element and directly adhere on the solder side of printed circuit board (PCB).Thus, the circuit board volume of the power supply changeover device of can macro applying, but also can improve the problem of the accumulated heat of high-temperature components gathering.
For allowing, state feature and advantage on the utility model and can become apparent, special embodiment below, and coordinate appended graphic being described in detail below.
Accompanying drawing explanation
Below appended graphic is a part for specification of the present utility model, illustrated example embodiment of the present utility model, principle of the present utility model is described together with the description of appended graphic and specification.
Fig. 1 is the schematic diagram of the power supply changeover device of the utility model one one exemplary embodiment.
Fig. 2 A is the schematic diagram of component side of the printed circuit board (PCB) of Fig. 1.
Fig. 2 B is the schematic diagram of solder side of the printed circuit board (PCB) of Fig. 1.
Fig. 3 is that the circuit of the power supply changeover device of Fig. 1 is implemented schematic diagram.
Fig. 4 be the utility model one one exemplary embodiment take forward type framework as basic output stage schematic diagram.
Fig. 5 be the utility model one one exemplary embodiment take forward type framework as basic monocrystalline input stage schematic diagram.
Fig. 6 be the utility model one one exemplary embodiment take forward type framework as basic twin crystal input stage schematic diagram.
[main element symbol description]
10: power supply changeover device
101: printed circuit board (PCB)
101a: the component side of printed circuit board (PCB)
101b: the solder side of printed circuit board (PCB)
103: auto-excitation type circuit of synchronous rectification
301: input stage
303-1-303-3: output stage
305-1-305-3: clamp circuit
T: transformer
NP: the primary side of transformer
NS1-NS3: the secondary side of transformer
Q1-Q6: SMD power switch
Q7-Q9: power switch
ZD1-ZD4: voltage stabilizing didoe
D1: diode
C1: electric capacity
LO: outputting inductance
CO: output capacitance
V1-V3: power supply
VIN: input voltage
CS1, CS2: control signal
Embodiment
With detailed reference to the one exemplary embodiment of the utility model, the example of described one exemplary embodiment is described in the accompanying drawings.In addition, all possibility parts are used the element/member of same numeral to represent identical or similar portions in graphic and execution mode.
Fig. 1 is the schematic diagram of the power supply changeover device (power converter) 10 of the utility model one one exemplary embodiment.Please refer to Fig. 1, the power supply changeover device 10 of this one exemplary embodiment comprises: printed circuit board (PCB) (print circuit board, PCB) 101, transformer (transformer) T, and auto-excitation type circuit of synchronous rectification (self-driven synchronous rectification circuit, self-driven SR circuit) 103.Wherein, printed circuit board (PCB) 101 has component side (component side) 101a(as shown in Figure 2 A) and solder side (solder side) 101b(is as shown in Figure 2 B).
On the other hand, Fig. 3 illustrates the circuit enforcement schematic diagram into the power supply changeover device 10 of Fig. 1.Please merge with reference to Fig. 1-Fig. 3, in this one exemplary embodiment, transformer T is configured on the component side 101a of printed circuit board (PCB) 101, and there is primary side (primary winding) NP, the first secondary side (secondary winding) NS1, the second secondary side NS2, and the 3rd secondary side NS3.
Auto-excitation type circuit of synchronous rectification 103 comprises SMD power switch (the SMD power switch) Q1-Q6 on a plurality of solder side 101b that directly adhere to printed circuit board (PCB) 101.Wherein, the first secondary side NS1 of the connection transformer T of the first in SMD power switch Q1-Q6 (for example: Q1 and Q2).Clearer, the first end of SMD power switch Q1 couples the Same Name of Ends (common-polarity terminal gets place ready) of the first secondary side NS1 of transformer T, and the control end of SMD power switch Q1 is coupled to node ND1.The first end of SMD power switch Q2 couples different name end (the opposite-polarity terminal of the first secondary side NS1 of transformer T, do not get place ready), the second end of SMD power switch Q2 couples the second end of SMD power switch Q1, and the control end of SMD power switch Q2 is coupled to node ND2.
In addition, the second secondary side NS2 of the second portion in SMD power switch Q1-Q6 (for example: Q3 and Q4) connection transformer T.Clearer, the first end of SMD power switch Q3 couples the Same Name of Ends of the second secondary side NS2 of transformer T, and the control end of SMD power switch Q3 is coupled to node ND1.The first end of SMD power switch Q4 couples the different name end of the second secondary side NS2 of transformer T, and the second end of SMD power switch Q4 couples the second end of SMD power switch Q3, and the control end of SMD power switch Q4 is coupled to node ND2.In this one exemplary embodiment, node ND1 can be coupled to the different name end of the second secondary side NS2 of transformer T, and node ND2 is coupled to the Same Name of Ends of the first secondary side NS1 of transformer T.
Moreover, the 3rd secondary side NS3 of the third part in SMD power switch Q1-Q6 (for example: Q5 and Q6) connection transformer T.Clearer, the first end of SMD power switch Q5 couples the Same Name of Ends of the 3rd secondary side NS3 of transformer T, and the control end of SMD power switch Q5 is coupled to node ND1.The first end of SMD power switch Q6 couples the different name end of the 3rd secondary side NS3 of transformer T, and the second end of SMD power switch Q6 couples the second end of SMD power switch Q5, and the control end of SMD power switch Q6 is coupled to node ND2.Hence one can see that, and SMD power switch Q1, Q3 and Q5 system are separately positioned on the first low-pressure side to the 3rd secondary side NS1-NS3 (low side) path of transformer T.
In addition, power supply changeover device 10 also comprises: input stage (input stage) 301, output stage (output stage) 303-1-303-3, and clamp circuit (clamping circuit) 305-1-305-3.Wherein, input stage 301 is in order to receive input voltage (input voltage) VIN.And the primary side NP of transformer T couples input stage 301, and react at least one control signal (control signal, for example control signal CS1 and/or CS2) and receive the input voltage VIN (describing in detail again after appearance) from input stage 301.
The first end of output stage 303-1 and SMD power switch Q2 and the second end also connect, and in order to react on the primary side NP of input voltage VIN and transformer T and the number of turns of the first secondary side NS1, than (turns ratio, NP/NS1), produce the first power supply V1.Similarly, first end and the second end of output stage 303-2 and SMD power switch Q4 also connects, and produces second source V2 in order to react on the primary side NP of input voltage VIN and transformer T and the number of turns of the second secondary side NS2 than (NP/NS2).In addition, first end and the second end of output stage 303-3 and SMD power switch Q6 also connects, in order to react on the primary side NP of input voltage VIN and transformer T and the number of turns of the 3rd secondary side NS3 produces the 3rd power supply V3 than (NP/NS3).
In this one exemplary embodiment, output stage 303-1-303-3 all can be for take the output stage of forward type framework as basis (forward-based).With this understanding, as shown in Figure 4, output stage 303-1-303-3 can distinctly comprise outputting inductance (output inductor) LO and output capacitance (output capacitor) CO, and power supply changeover device 10 can be forward power switcher (forward power converter).
Clamp circuit 305-1 comprises voltage stabilizing didoe (Zener diode) ZD1 and the ZD2 of a pair of back-to-back (back-to-back), and be connected across between the Same Name of Ends and different name end of the first secondary side NS1 of transformer T, in order to the voltage of the first secondary side NS1 of transformer T is carried out to clamp.Clearer, the negative electrode of voltage stabilizing didoe ZD1 (cathode) couples the Same Name of Ends of the first secondary side NS1 of transformer T.The negative electrode of voltage stabilizing didoe ZD2 couples the different name end of the first secondary side NS1 of transformer T, and the anode of voltage stabilizing didoe ZD2 (anode) couples the anode of voltage stabilizing didoe ZD1.
Clamp circuit 305-2 comprises diode D1 and the capacitor C 1 being serially connected, and is connected across between the Same Name of Ends and different name end of the second secondary side NS2 of transformer T, in order to the voltage of the second secondary side NS2 of transformer T is carried out to clamp.Clearer, the negative electrode of diode D1 couples the different name end of the second secondary side NS2 of transformer T.The first end of capacitor C 1 couples the anode of diode D1, and the second end of capacitor C 1 couples the Same Name of Ends of the second secondary side NS2 of transformer T3.
Clamp circuit 305-3 comprises a pair of back-to-back voltage stabilizing didoe ZD3 and ZD4, and is connected across between the Same Name of Ends and different name end of the 3rd secondary side NS3 of transformer T, in order to the voltage of the 3rd secondary side NS3 of transformer T is carried out to clamp.Clearer, the negative electrode of voltage stabilizing didoe ZD3 couples the Same Name of Ends of the 3rd secondary side NS3 of transformer T.The negative electrode of voltage stabilizing didoe ZD4 couples the different name end of the 3rd secondary side NS3 of transformer T, and the anode of voltage stabilizing didoe ZD4 couples the anode of voltage stabilizing didoe ZD3.
On the other hand, suppose that input stage 301 only receives under the condition of single control signal, control signal CS1 for example, input stage 301 is monocrystalline input stage (single switch input stage).With this understanding, as shown in Figure 5, input stage 301 can comprise power switch Q7.Wherein, the first end of power switch Q7 couples the Same Name of Ends of the primary side NP of transformer T, and the second end of power switch Q7 is coupled to earthing potential (ground potential), and the control end of power switch Q7 is in order to reception control signal CS1.In addition, the different name end of the primary side NP of transformer T1 is in order to receive input voltage VIN.
In this one exemplary embodiment, control signal CS1 can be pulse-width modulation signal (pulse width modulation signal, PWM signal).With this understanding, SMD power switch Q2, Q4 and Q6 and power switch Q7 only can react on the activation (enable) of control signal (pulse-width modulation signal) CS1 and synchronously conducting (turned-on).In addition, SMD power switch Q1, Q3 and Q5 only can react on the forbidden energy (disable) of control signal (pulse-width modulation signal) CS1 and conducting.
Base this, in input stage 301 for monocrystalline input stage and output stage 303-1-303-3 are for take under the condition of the output stage that forward type framework is basis, as SMD power switch Q2, Q4 and Q6 and power switch Q7 react on control signal (pulse-width modulation signal) CS1 activation and synchronously during conducting, previously being stored in the energy of the outputting inductance LO of output stage 303-1-303-3 can be respectively charge to the output capacitance CO of output stage 303-1-303-3, thereby make output stage 303-1-303-3 supply respectively the first to the 3rd power supply V1-V3 to load (load, do not illustrate, it is for example computer system, but be not restricted to this).In addition, when SMD power switch Q1, Q3 and Q5 react on the forbidden energy of control signal (pulse-width modulation signal) CS1 and during conducting, the outputting inductance LO of output stage 303-1-303-3 can carry out respectively energy storage.Thus, react on control signal (pulse-width modulation signal) CS1 alternately activation and forbidden energy, (forward type) power supply changeover device 10 with monocrystalline input stage supplies the first to the 3rd power supply V1-V3 sustainably to load (computer system).
On the other hand, suppose input stage 301 reception control signal CS1 and CS2 simultaneously, input stage 301 is twin crystal input stage (dual switch input stage).With this understanding, as shown in Figure 6, input stage 301 can comprise power switch Q8 and Q9.Wherein, the first end of power switch Q8 and Q9 is in order to receive input voltage VIN, the second end of power switch Q8 and Q9 couples respectively different name end and the Same Name of Ends of the primary side NP of transformer T, and the control end of power switch Q8 and Q9 is distinguished reception control signal CS1 and CS2.
In this one exemplary embodiment, control signal CS1 and CS2 all can be pulse-width modulation signal (PWM signal).With this understanding, SMD power switch Q2, Q4 and Q6 and power switch Q8 and Q9 only can react on the activation of control signal (pulse-width modulation signal) CS1 and CS2 and synchronously conducting.In addition, SMD power switch Q1, Q3 and Q5 only can react on the forbidden energy of control signal (pulse-width modulation signal) CS1 and CS2 and conducting.
Base this, in input stage 301 for twin crystal input stage and output stage 301-1-301-3 are for take under the condition of the output stage that forward type framework is basis, as SMD power switch Q2, Q4 and Q6 and power switch Q8 and Q9 react on control signal (pulse-width modulation signal) CS1 and CS2 activation and synchronously during conducting, the energy that had previously been stored in the outputting inductance LO of output stage 303-1-303-3 can charge by the output capacitance CO to output stage 303-1-303-3 out of the ordinary, thereby make output stage 303-1-303-3 supply out of the ordinary the first to the 3rd power supply V1-V3 to load (computer system).In addition, when power switch Q1, Q3 and Q5 react on the forbidden energy of control signal (pulse-width modulation signal) CS1 and CS2 and during conducting, the outputting inductance LO of output stage 303-1-303-3 can distinctly carry out energy storage.Thus, react on control signal (pulse-width modulation signal) CS1 and CS2 alternately activation and forbidden energy, (forward type) power supply changeover device 10 with twin crystal input stage supplies the first to the 3rd power supply V1-V3 sustainably to load (computer system).
Hence one can see that, in power supply changeover device 10, set auto-excitation type circuit of synchronous rectification 103 is without setting up extraly and controlling relevant peripheral circuit and just can operate voluntarily, and it completely just reacts on the Same Name of Ends of the first secondary side NS1 of transformer T and the voltage on the different name end of the second secondary side NS2 and operates.And auto-excitation type circuit of synchronous rectification 103 set in power supply changeover device 10 can be used the application in monocrystalline and twin crystal input stage simultaneously.Thus, auto-excitation type circuit of synchronous rectification 103 set in power supply changeover device 10 not only can be promoted the whole efficiency of power supply changeover device 10, but also can reduce the cost of power supply changeover device 10.
On the other hand, all power switch Q1-Q6 due to auto-excitation type circuit of synchronous rectification 103 change to be made as SMD element (SMD) and directly adhere on the solder side 101b of printed circuit board (PCB) 101.Thus, because the volume of SMD power switch Q1-Q6 is quite little, so the circuit board volume of the power supply changeover device 10 of can macro applying.
In addition, because all SMD power switch Q1-Q6 of auto-excitation type circuit of synchronous rectification 103 are that directly to adhere to the solder side 101b of printed circuit board (PCB) 101 upper, but not as traditional for adopting the element pattern of plug-in type encapsulation (DIP) to be configured on the component side 101a of printed circuit board (PCB) 101.Add, if independently cook up a heat dissipation region that layout metal is usingd as SMD power switch Q1-Q6 on a large scale on the solder side 101b of printed circuit board (PCB) 101, can effectively improve the problem of the accumulated heat of high-temperature components gathering.Certainly, suppose to be also provided with layout metal on the component side 101a of printed circuit board (PCB) 101, the mode that can see through through hole (via) is independently to cook up another heat dissipation region that layout metal is usingd as SMD power switch Q1-Q6 on a large scale again on the component side 101a at printed circuit board (PCB) 101.Thus, can more effectively improve the problem of the accumulated heat of high-temperature components gathering.
In sum, the utility model in power supply changeover device set auto-excitation type circuit of synchronous rectification without setting up extraly and controlling relevant peripheral circuit and just can operate voluntarily.Thus, the utility model set auto-excitation type circuit of synchronous rectification in power supply changeover device not only can be promoted the whole efficiency of power supply changeover device, but also can reduce the cost of power supply changeover device.In addition, all power switchs that the utility model is associated with auto-excitation type circuit of synchronous rectification change to be made as SMD element and directly adhere on the solder side of printed circuit board (PCB).Thus, the circuit board volume of the power supply changeover device of can macro applying, but also can improve the problem of the accumulated heat of high-temperature components gathering.
Although the utility model discloses as above with embodiment; so it is not in order to limit the utility model; under any, in technical field, have and conventionally know the knowledgeable; within not departing from the spirit and scope of the utility model; when doing a little change and retouching, thus the protection range of the utility model when depending on after the attached claim person of defining be as the criterion.In addition, arbitrary embodiment of the present utility model or claim must not reached whole objects or advantage or the feature that the utility model discloses.In addition, summary part and title are only the use for auxiliary patent document search, are not used for limiting the interest field of the utility model.
Claims (11)
1. a power supply changeover device, is characterized in that, comprising:
One printed circuit board (PCB), has a component side and a solder side;
One transformer, is configured on this component side, and has a primary side and one first secondary side; And
One auto-excitation type circuit of synchronous rectification, comprises a plurality of SMD power switches that directly adhere on this solder side, and a first of wherein said SMD power switch connects this first secondary side.
2. power supply changeover device as claimed in claim 1, is characterized in that the SMD power switch of ，Gai first comprises:
One first SMD power switch, its first end couples the Same Name of Ends of this first secondary side, and its control end is coupled to a first node; And
One second SMD power switch, its first end couples the different name end of this first secondary side, and its second end couples the second end of this first SMD power switch, and its control end is coupled to a Section Point.
3. power supply changeover device as claimed in claim 2, is characterized in that, this transformer also has one second secondary side, and one of described SMD power switch second portion connects this second secondary side, and the SMD power switch of this second portion comprises:
One the 3rd SMD power switch, its first end couples the Same Name of Ends of this second secondary side, and its control end is coupled to this first node; And
One the 4th SMD power switch, its first end couples the different name end of this second secondary side, and its second end couples the second end of the 3rd SMD power switch, and its control end is coupled to this Section Point.
4. power supply changeover device as claimed in claim 3, is characterized in that, this transformer has more one the 3rd secondary side, and one of those SMD power switches third part connects the 3rd secondary side, and the SMD power switch of this third part comprises:
One the 5th SMD power switch, its first end couples the Same Name of Ends of the 3rd secondary side, and its control end is coupled to this first node; And
One the 6th SMD power switch, its first end couples the different name end of the 3rd secondary side, and its second end couples the second end of the 5th SMD power switch, and its control end is coupled to this Section Point;
Wherein, this first node is coupled to the different name end of this second secondary side, and this Section Point is coupled to the Same Name of Ends of this first secondary side.
5. power supply changeover device as claimed in claim 4, is characterized in that, also comprises:
One input stage, in order to receive an input voltage, wherein, this primary side couples this input stage, and reacts at least one control signal and receive this input voltage from this input stage.
6. power supply changeover device as claimed in claim 5, it is characterized in that, described at least one control signal comprises a single control signal, and this input stage is a monocrystalline input stage, and this monocrystalline input stage comprises one the 7th power switch, its first end couples the Same Name of Ends of this primary side, its second end is coupled to an earthing potential, and its control end is in order to receive this single control signal, wherein, the different name end of this primary side is in order to receive this input voltage, and this single control signal is a pulse-width modulation signal.
7. power supply changeover device as claimed in claim 6, is characterized in that,
This second SMD power switch, the 4th SMD power switch and the 6th SMD power switch and the only synchronously conducting according to the activation of this pulse-width modulation signal of the 7th power switch; And
This first SMD power switch, the 3rd SMD power switch and the only synchronously conducting according to the forbidden energy of this pulse-width modulation signal of the 5th SMD power switch.
8. power supply changeover device as claimed in claim 5, it is characterized in that, described at least one control signal comprises one first control signal and one second control signal, this first control signal and this second control signal are respectively a pulse-width modulation signal, this input stage is a twin crystal input stage, and this twin crystal input stage comprises one the 7th power switch and one the 8th power switch, its first end is in order to receive this input voltage, its second end distinctly couples different name end and the Same Name of Ends of this primary side, and its control end distinctly receives this first control signal and this second control signal.
9. power supply changeover device as claimed in claim 8, is characterized in that,
This second SMD power switch, the 4th SMD power switch and the 6th SMD power switch, and the 7th power switch and the 8th power switch only react on the activation of this pulse-width modulation signal and synchronously conducting; And
This first SMD power switch, the 3rd SMD power switch and the 5th SMD power switch only react on the forbidden energy of this pulse-width modulation signal and synchronously conducting.
10. power supply changeover device as claimed in claim 4, is characterized in that, also comprises:
One first output stage, with first end and second end of this second SMD power switch and connect, in order to react on one first number of turns of this input voltage and this primary side and this first secondary side than and produce one first power supply;
One second output stage, with first end and second end of the 4th SMD power switch and connect, in order to react on one second number of turns of this input voltage and this primary side and this second secondary side than and produce a second source; And
One the 3rd output stage, with first end and second end of the 6th SMD power switch and connect, in order to react on one the 3rd number of turns of this input voltage and this primary side and the 3rd secondary side than and produce one the 3rd power supply.
11. power supply changeover devices as claimed in claim 4, is characterized in that, also comprise:
One first clamp circuit, comprises one first pair of back-to-back voltage stabilizing didoe, and is connected across between the Same Name of Ends and different name end of this first secondary side, in order to the voltage of this first secondary side is carried out to clamp;
One second clamp circuit, comprises the diode and the electric capacity that are serially connected, and is connected across between the Same Name of Ends and different name end of this second secondary side, in order to the voltage of this second secondary side is carried out to clamp; And
One the 3rd clamp circuit, comprises one second pair of back-to-back voltage stabilizing didoe, and is connected across between the Same Name of Ends and different name end of the 3rd secondary side, in order to the voltage of the 3rd secondary side is carried out to clamp.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| TW101209180 | 2012-05-15 | ||
| TW101209180U TWM445302U (en) | 2012-05-15 | 2012-05-15 | Power converter with a self-driven synchronous rectification circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203457062U true CN203457062U (en) | 2014-02-26 |
Family
ID=48090985
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201320235867.6U Expired - Lifetime CN203457062U (en) | 2012-05-15 | 2013-05-03 | Power converter with self-excited synchronous rectification circuit |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN203457062U (en) |
| TW (1) | TWM445302U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US10811985B2 (en) | 2016-08-26 | 2020-10-20 | General Electric Company | Power conversion system and an associated method thereof |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113572349B (en) * | 2020-04-28 | 2022-10-14 | 艾科微电子(深圳)有限公司 | Synchronous rectification controller and related control method |
-
2012
- 2012-05-15 TW TW101209180U patent/TWM445302U/en not_active IP Right Cessation
-
2013
- 2013-05-03 CN CN201320235867.6U patent/CN203457062U/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US10811985B2 (en) | 2016-08-26 | 2020-10-20 | General Electric Company | Power conversion system and an associated method thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| TWM445302U (en) | 2013-01-11 |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20140226 |