CN106877675A - A kind of normal shock switching power circuit two-tube in parallel of wide range input - Google Patents
A kind of normal shock switching power circuit two-tube in parallel of wide range input Download PDFInfo
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- CN106877675A CN106877675A CN201710201283.XA CN201710201283A CN106877675A CN 106877675 A CN106877675 A CN 106877675A CN 201710201283 A CN201710201283 A CN 201710201283A CN 106877675 A CN106877675 A CN 106877675A
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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
- H02M3/3353—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 at least two simultaneously operating switches on the input side, e.g. "double forward" or "double (switched) flyback" converter
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Abstract
A kind of normal shock switching power circuit two-tube in parallel of wide range input, is related to Switching Power Supply and DC DC converters field；Including transformer T1, the two-tube parallel circuit of positive activation type, drive amplification and strong and weak electric isolating circuit, voltage-stabilizing protection power supply circuit and rectifying and wave-filtering freewheeling circuit；Wherein, transformer T1 is connected with the two-tube parallel circuit of positive activation type, voltage-stabilizing protection power supply circuit and rectifying and wave-filtering freewheeling circuit respectively；One end of the two-tube parallel circuit of positive activation type is connected with transformer T1, and the other end of the two-tube parallel circuit of positive activation type is connected with after drive amplification and strong and weak electric isolating circuit series connection with outside pwm control circuit；Voltage-stabilizing protection power supply circuit is connected with transformer T1 and external control circuit power supply respectively；The present invention realizes the occasion in different voltage class, using identical transformer, on the premise of not changing circuit, can be thus continuing with not transformation depressor, has saved R＆D costs and R＆D cycle.
Description
Technical field
The present invention relates to Switching Power Supply and DC-DC converter field, particularly a kind of wide range input it is two-tube simultaneously
Connection normal shock switching power circuit.
Background technology
In the DC-DC Switching Power Supplies of middle low power, and with buffer action, the most frequently used circuit topological structure is inverse-excitation type
Switching Power Supply and positive activation type circuit.In both circuits, the switching frequency of circuit is generally higher than 100KHz, and most crucial part is just
It is transformer T1, the design of electric source topology and external circuit.In positive activation type on-off circuit, generally there are two magnetic elements to distinguish
For completing the isolation of input and output and the transmission of energy and control.The magnetic element of the isolation for completing input and output is exactly
Transformer T1.Transformer also plays the isolation of input and output simultaneously, i.e. primary and secondary side is isolated.In the design of transformer, if
The selection of meter method and magnetic element and the canoe in later stage are critically important.Transformer T1 is that working frequency exceedes intermediate frequency
The power transformer of (10kHz), is mainly used in high frequency switch power as high-frequency switch power transformer, also has for frequency conversion
As the supply transformer of drive circuit in device.
In the design of current switching power circuit, suitable input voltage range is restricted, it is impossible to the voltage of wide scope again
The lower work of change, this is accomplished by the different transformer T1 of design, designs different circuits, goes to be adapted to different control sources etc.
Level, which improves R＆D costs, while extending the cycle of research and development.
The content of the invention
Above-mentioned deficiency it is an object of the invention to overcome prior art, there is provided a kind of wide range input it is two-tube simultaneously
Connection normal shock switching power circuit, realizes the occasion in different voltage class, using identical transformer, thus can be not
Transformation depressor, on the premise of not changing circuit, is continuing with, and has saved R＆D costs and R＆D cycle.
Above-mentioned purpose of the invention is achieved by following technical solution：
A kind of normal shock switching power circuit two-tube in parallel of wide range input, including transformer T1, positive activation type are two-tube
Parallel circuit, drive amplification and strong and weak electric isolating circuit, voltage-stabilizing protection power supply circuit and rectifying and wave-filtering freewheeling circuit；Wherein, become
Depressor T1 is connected with the two-tube parallel circuit of positive activation type, voltage-stabilizing protection power supply circuit and rectifying and wave-filtering freewheeling circuit respectively；Positive activation type
One end of two-tube parallel circuit is connected with transformer T1, the other end and drive amplification and the strong and weak electricity of the two-tube parallel circuit of positive activation type
It is connected with outside pwm control circuit after isolation circuit series connection；Voltage-stabilizing protection power supply circuit respectively with transformer T1 and external control
Circuit power is connected.
In a kind of normal shock switching power circuit two-tube in parallel of above-mentioned wide range input, the transformer T1 secondary
Output par, c also includes diode D1, diode D2 and inductance L1；The transformer T1 respectively with the anode of diode D1 and two
After the anode connection of pole pipe D2, the negative electrode of diode D1 and the negative electrode of diode D2 are connected with inductance L1, connection voltage-stabilizing protection is supplied
Circuit.
In a kind of normal shock switching power circuit two-tube in parallel of above-mentioned wide range input, described transformer T1 bags
Include 6 pins, respectively pin 1-6；Wherein, pin 1 is connected with the two-tube parallel circuit of positive activation type；Pin 2 is two-tube with positive activation type
Parallel circuit is connected；Pin 3 is connected with the anode of diode D1；Pin 4 is connected with the anode of diode D2；Pin 5 and rectification
Filtering freewheeling circuit connection；Pin 6 is connected with rectifying and wave-filtering freewheeling circuit.
In a kind of normal shock switching power circuit two-tube in parallel of above-mentioned wide range input, the pipe of the transformer T1
The pin 2 of pin 1 and transformer T1 is input into primary side winding mode；The pin 3 of the transformer T1 and the pin 4 of transformer T1 with
Vice-side winding mode is exported；The pin 5 of the transformer T1 and the pin 6 of transformer T1 are exported in vice-side winding mode.
In a kind of normal shock switching power circuit two-tube in parallel of above-mentioned wide range input, the positive activation type is two-tube simultaneously
Connection circuit includes diode D8, diode D9, resistance R16, resistance R17, metal-oxide-semiconductor Q1, metal-oxide-semiconductor Q2, metal-oxide-semiconductor Q3 and metal-oxide-semiconductor Q4；
Wherein, one end of resistance R16 is connected with the source electrode of metal-oxide-semiconductor Q3 and the source electrode of metal-oxide-semiconductor Q4 respectively, the other end of resistance R16 and two
The anode connection of pole pipe D9；One end of resistance R17 is connected with the source electrode of metal-oxide-semiconductor Q3 and the source electrode of metal-oxide-semiconductor Q4 respectively, resistance R17
The other end be connected with the anode of diode D9；Resistance R16 and resistance R17 is in parallel；The gate pole of metal-oxide-semiconductor Q3 is connected with resistance R7；
The drain electrode of metal-oxide-semiconductor Q3 is connected with the pin 2 of transformer T1；The gate pole of metal-oxide-semiconductor Q4 is connected with resistance R6；The drain electrode of metal-oxide-semiconductor Q4 with
The anode connection of diode D8；The source electrode of metal-oxide-semiconductor Q3 is connected with the source electrode of metal-oxide-semiconductor Q4；The negative electrode of diode D9 is with metal-oxide-semiconductor Q1's
Source electrode is connected；The gate pole of metal-oxide-semiconductor Q1 is connected with resistance R3；The drain electrode and the diode D8 that drain respectively with metal-oxide-semiconductor Q2 of metal-oxide-semiconductor Q1
Negative electrode connection；The gate pole of metal-oxide-semiconductor Q2 is connected with resistance R4.
In a kind of normal shock switching power circuit two-tube in parallel of above-mentioned wide range input, the drive amplification and strong
Light current isolation circuit includes transformer T2, resistance R1, resistance R2, resistance R3, resistance R4, resistance R5, resistance R6, resistance R7, two
Pole pipe D3, diode D4, diode D5, diode D6, triode Q5, triode Q6 and electric capacity C1；Wherein, the moon of diode D5
Pole is connected with transformer T2；One end of resistance R2 is connected with transformer T2, the other end of resistance R2 respectively with the sun of diode D5
Pole, resistance R3, resistance R4 connections；Resistance R3, resistance R4 are connected with the two-tube parallel circuit of positive activation type respectively；One end of resistance R5 point
Negative electrode not with transformer T2 and diode D6 is connected；The other end of resistance R5 anode, resistance R6, electricity respectively with diode D6
Resistance R7 connections；Resistance R6, resistance R7 are connected with the two-tube parallel circuit of positive activation type respectively；One end of electric capacity C1 connects with transformer T2
Connect, the other end of electric capacity C1 anode, the negative electrode of diode D4, the emitter-base bandgap grading of triode Q5, triode Q6 respectively with diode D3
Emitter-base bandgap grading connection；The negative electrode of diode D3 is connected with the colelctor electrode of triode Q5；The base stage of triode Q5 respectively with triode Q6
Base stage, resistance R1 one end connection；The other end of resistance R1 is connected with outside pwm control circuit；The colelctor electrode of triode Q6
Anode respectively with diode D4, transformer T2 are connected.
In a kind of normal shock switching power circuit two-tube in parallel of above-mentioned wide range input, the transformer T2 includes
6 pins, are pin 1-6；Wherein, the pin 1 of transformer T2 is connected with the two-tube parallel circuit of positive activation type；The pin of transformer T2
2 are connected with resistance R5；The pin 3 of transformer T2 is connected with the two-tube parallel circuit of positive activation type；The pin 4 of transformer T2 and resistance R2
Connection；The pin 5 of transformer T2 is connected with electric capacity C1；The pin 6 of transformer T2 is connected with the anode of diode D4.
In a kind of normal shock switching power circuit two-tube in parallel of above-mentioned wide range input, the pipe of the transformer T2
Pin 5 and pin 6 are input into primary side winding mode；The pin 3 of the transformer T2 and the pin 4 of transformer T2 are with vice-side winding side
Formula is exported；The pin 1 of the transformer T2 and the pin 2 of transformer T2 are exported in vice-side winding mode.
In a kind of normal shock switching power circuit two-tube in parallel of above-mentioned wide range input, the voltage-stabilizing protection is powered
Circuit includes control chip U1, electric capacity C2, electric capacity C3, electric capacity C4, resistance R8, resistance R9, resistance R10, resistance R11, resistance
R12, resistance R13, resistance R14, resistance R15, diode D7 and inductance L2；Wherein, the FB ends of control chip U1 respectively with resistance
R14, resistance R15 are connected；The VCC ends of control chip U1 are connected with electric capacity C4；The BST ends of control chip U1 are connected with electric capacity C3；
The SW ends of control chip U1 are connected with inductance L2 and electric capacity C3 respectively；Inductance L2 is connected with the anode of resistance R14, diode D7；
The negative electrode of diode D7 is connected with external control circuit power supply；The RON ends of control chip U1 are connected with one end of resistance R13；Control
The UVLO ends of coremaking piece U1 are connected with resistance R11, resistance R12 respectively；The RTN ends ground connection of control chip U1；Resistance R11 and resistance
After R12 series connection, the first parallel circuit, first parallel circuit are constituted with electric capacity C2, resistance R8, resistance R9, resistance R10 respectively
VIN ends respectively with control chip U1, inductance L1 are connected.
In a kind of normal shock switching power circuit two-tube in parallel of above-mentioned wide range input, the rectifying and wave-filtering afterflow
Circuit includes binary diode D10, binary diode D11, inductance L3, electric capacity C5, electric capacity C6, electric capacity C7, electric capacity C8, resistance
R33 and resistance R34；Wherein, it is connected with transformer T1 after the anode parallel connection of binary diode D10；The negative electrode of binary diode D10
Negative electrode respectively with binary diode D11, inductance L3 are connected；Electric capacity C5, electric capacity C6, electric capacity C7, electric capacity C8, resistance R33 and electricity
Resistance R34 constitutes the second parallel circuit, and anode of second parallel circuit respectively with inductance L3, binary diode D11 is connected.
The present invention has the following advantages that compared with prior art：
(1) present invention employs the normal shock switching power circuit two-tube in parallel of wide range input, different electricity are realized
The occasion of grade is pressed, using identical transformer, the 24V of stabilization can be exported, improve the performance of circuit power, and
Circuit is built simple and reliable, has saved R＆D costs and research and development time；
(2) present invention employs voltage-stabilizing protection power supply circuit, realize under the change of input voltage 320-1200V, energy
Stabilization provides power supply for control circuit when enough, improves the protective capability to control circuit；
(3) present invention employs the two-tube parallel circuit of positive activation type, realize when high-tension high-power works, can be normal
Work, protection and detection effect are served to device, improve the safety coefficient and protective capability of whole Switching Power Supply；
(4) present invention employs highly reliable transformer T1, realize on the premise of identical transformer, different range
Control source, can export identical burning voltage, improve the availability of power supply, widen range of application；
(5) present invention employs drive amplification and strong and weak electric isolating circuit, realize to the amplification of driving force and right
The isolation of strong and weak electricity, improves the driving force to pipe, accelerates the switching speed of pipe, reduces switching loss, while
Also improve antijamming capability.
Brief description of the drawings
Fig. 1 is normal shock quick closing valve power circuit schematic diagram of the present invention.
Specific embodiment
The present invention is described in further detail with specific embodiment below in conjunction with the accompanying drawings：
As shown in Figure 1 be normal shock quick closing valve power circuit schematic diagram, have figure understand, a kind of wide range input it is two-tube simultaneously
Connection normal shock switching power circuit, it includes the two-tube parallel circuit of positive activation type, transformer T1, drive amplification and strong and weak electric isolution electricity
Road, voltage-stabilizing protection power supply circuit and rectifying and wave-filtering freewheeling circuit.
In circuit of the present invention, transformer T1 previous stages are the two-tube parallel circuit of positive activation type, drive amplification and strong and weak electric isolution
The amplification that circuit is mainly used in the driving force of outside pwm control circuit is connected to the two-tube parallel circuit of positive activation type, and voltage stabilizing is protected
Shield power supply circuit is mainly used for after power initiation to the working power of control circuit with stable.
Wherein, transformer T1 respectively with the two-tube parallel circuit of positive activation type, voltage-stabilizing protection power supply circuit and rectifying and wave-filtering afterflow
Circuit is connected；One end of the two-tube parallel circuit of positive activation type is connected with transformer T1, the other end of the two-tube parallel circuit of positive activation type with
It is connected with outside pwm control circuit after drive amplification and strong and weak electric isolating circuit series connection；Voltage-stabilizing protection power supply circuit respectively with change
Depressor T1 and external control circuit power supply are connected.
The transformer T1 secondary output par, c also includes diode D1, diode D2 and inductance L1；The transformer T1
It is connected with the anode of diode D1 and the anode of diode D2 respectively, the negative electrode of diode D1 and the negative electrode and inductance of diode D2
After L1 connections, voltage-stabilizing protection power supply circuit is connected.
Transformer T1 includes 6 pins, respectively pin 1-6；Wherein, pin 1 is connected with the two-tube parallel circuit of positive activation type；
Pin 2 is connected with the two-tube parallel circuit of positive activation type；Pin 3 is connected with the anode of diode D1；The anode of pin 4 and diode D2
Connection；Pin 5 is connected with rectifying and wave-filtering freewheeling circuit；Pin 6 is connected with rectifying and wave-filtering freewheeling circuit.
Described transformer T1, mainly to the design of transformer, transformation must selection parameter matching magnetic element
And skeleton, while rational turn ratio is selected in manufacturing process, and canoe.Ensure wide scope input.
The pin 1 of transformer T1 and the pin 2 of transformer T1 are input into primary side winding mode；The pin of the transformer T1
The pin 4 of 3 and transformer T1 is exported in vice-side winding mode；The pin 5 of the transformer T1 and the pin 6 of transformer T1 are with pair
Side winding method output.
The two-tube parallel circuit of positive activation type includes diode D8, diode D9, resistance R16, resistance R17, metal-oxide-semiconductor Q1, metal-oxide-semiconductor
Q2, metal-oxide-semiconductor Q3 and metal-oxide-semiconductor Q4；Wherein, one end of resistance R16 is connected with the source electrode of metal-oxide-semiconductor Q3 and the source electrode of metal-oxide-semiconductor Q4 respectively,
The other end of resistance R16 is connected with the anode of diode D9；One end of resistance R17 respectively with the source electrode and metal-oxide-semiconductor Q4 of metal-oxide-semiconductor Q3
Source electrode connection, the other end of resistance R17 is connected with the anode of diode D9；Resistance R16 and resistance R17 is in parallel；Metal-oxide-semiconductor Q3's
Gate pole is connected with resistance R7；The drain electrode of metal-oxide-semiconductor Q3 is connected with the pin 2 of transformer T1；The gate pole of metal-oxide-semiconductor Q4 connects with resistance R6
Connect；The drain electrode of metal-oxide-semiconductor Q4 is connected with the anode of diode D8；The source electrode of metal-oxide-semiconductor Q3 is connected with the source electrode of metal-oxide-semiconductor Q4；Diode
The negative electrode of D9 is connected with the source electrode of metal-oxide-semiconductor Q1；The gate pole of metal-oxide-semiconductor Q1 is connected with resistance R3；The drain electrode of metal-oxide-semiconductor Q1 respectively with MOS
The drain electrode of pipe Q2 and the negative electrode connection of diode D8；The gate pole of metal-oxide-semiconductor Q2 is connected with resistance R4.
Wherein, because the present invention will be adapted to large-scale input voltage in the two-tube parallel circuit of described positive activation type, so
Metal-oxide-semiconductor Q1, metal-oxide-semiconductor Q2, metal-oxide-semiconductor Q3, metal-oxide-semiconductor Q4 and diode D8, diode D9 will select high withstand voltage, the pipe of high current
And diode, while the response speed of diode is fast, it is to avoid energy loss, resistance R16, R17 are sampling resistor, for detecting
Pipe whether excessively stream.
Drive amplification and strong and weak electric isolating circuit include transformer T2, resistance R1, resistance R2, resistance R3, resistance R4, resistance
R5, resistance R6, resistance R7, diode D3, diode D4, diode D5, diode D6, triode Q5, triode Q6 and electric capacity
C1；Wherein, the negative electrode of diode D5 is connected with transformer T2；One end of resistance R2 is connected with transformer T2, and resistance R2's is another
End anode respectively with diode D5, resistance R3, resistance R4 are connected；One end of resistance R5 respectively with transformer T2 and diode D6
Negative electrode connection；The other end of resistance R5 anode respectively with diode D6, resistance R6, resistance R7 are connected；One end of electric capacity C1
It is connected with transformer T2, the other end of electric capacity C1 anode respectively with diode D3, the negative electrode of diode D4, triode Q5 are penetrated
Pole, the emitter-base bandgap grading connection of triode Q6；The negative electrode of diode D3 is connected with the colelctor electrode of triode Q5；The base stage difference of triode Q5
Base stage, one end of resistance R1 with triode Q6 are connected；The other end of resistance R1 is connected with outside pwm control circuit；Triode
The colelctor electrode of Q6 anode respectively with diode D4, transformer T2 are connected.
Described drive amplification and strong and weak electric isolating circuit is mainly used in passing through three when pwm control circuit has signal to produce
Pole pipe Q5, triode Q6 is amplified to drive signal, there is provided driving force, diode D3, and D4 is mainly used in as triode Q5,
Afterflow effects of the triode Q6 when switching alternately, electric capacity C1 is capacitance, prevents the pulse transformer magnetic saturation of rear stage,
By T2, go to drive the two-tube parallel circuit of positive activation type through overdrive resistance R2, R3, R4, R5, R6, R7.
Transformer T2 includes 6 pins, is pin 1-6；Wherein, the pin 1 of transformer T2 electricity in parallel two-tube with positive activation type
Road connects；The pin 2 of transformer T2 is connected with resistance R5；The pin 3 of transformer T2 is connected with the two-tube parallel circuit of positive activation type；Become
The pin 4 of depressor T2 is connected with resistance R2；The pin 5 of transformer T2 is connected with electric capacity C1；The pin 6 and diode of transformer T2
The anode connection of D4.
Transformer T1 secondary output par, c also includes diode D1, diode D2 and inductance L1；The transformer T1 difference
It is connected with the anode of diode D1 and the anode of diode D2, the negative electrode of diode D1 and the negative electrode of diode D2 connect with inductance L1
After connecing, voltage-stabilizing protection power supply circuit is connected.
In addition, voltage-stabilizing protection power supply circuit includes control chip U1, electric capacity C2, electric capacity C3, electric capacity C4, resistance R8, resistance
R9, resistance R10, resistance R11, resistance R12, resistance R13, resistance R14, resistance R15, diode D7 and inductance L2；Wherein, control
The FB ends of chip U1 are connected with resistance R14, resistance R15 respectively；The VCC ends of control chip U1 are connected with electric capacity C4；Control chip
The BST ends of U1 are connected with electric capacity C3；The SW ends of control chip U1 are connected with inductance L2 and electric capacity C3 respectively；Inductance L2 and resistance
The anode connection of R14, diode D7；The negative electrode of diode D7 is connected with external control circuit power supply；The RON ends of control chip U1
One end with resistance R13 is connected；The UVLO ends of control chip U1 are connected with resistance R11, resistance R12 respectively；Control chip U1's
RTN ends are grounded；After resistance R11 and resistance R12 series connection, respectively with electric capacity C2, resistance R8, resistance R9, resistance R10 compositions first simultaneously
Connection circuit, first parallel circuit VIN ends respectively with control chip U1, inductance L1 are connected.
Wherein, described C2 capacitance selection have strict requirements, it is too big or it is too small all have an impact to T2, for T2 will
The transformer of the ratios such as selection, and electric current current-carrying capacity enough, open speed by what the resistance for changing resistance can control pipe.
Described voltage-stabilizing protection power supply circuit, after Switching Power Supply work, transformer output voltage VCC-15, as steady
The input of voltage protection circuit, by fictitious load R8, R9, R10 and storage capacitor C2 make the supply U1 of the voltage stabilization of output, and
R11, R12 are under-voltage protection sampling resistor, and for being protected in undertension, R13 is startup resistance, when control starts
Between, R14, R15 are feedback resistance, monitor output voltage, and L2 is energy storage inductor, for being powered to external control circuit.
Described voltage-stabilizing protection power supply circuit, when applied voltage changes from 320-1200V, due to the characteristic of transformer
VCC-15 proportional can also be raised, if powered directly to external control circuit, because control circuit has input voltage range
It is required that, external control circuit chip will be burnt.So, plus a mu balanced circuit.So when voltage wide range changes, it is ensured that
The power supply stabilization of circuit is controlled, makes control circuit normal work, it is ensured that whole Switching Power Supply normal work.For R8, R9,
For R10 fictitious loads, the resistance that power must be selected sufficiently large, this ensure that when power heat release is consumed, being unlikely to handle
Resistance burns out.
Diode D1, D2, D3, D4, D5, D6, D7, D8, D9, D10, D11 in these described circuits are fast quick-recovery
Diode, it is ensured that recovery time is sufficiently small, makes energy loss smaller.
The content not being described in detail in description of the invention belongs to the known technology of those skilled in the art.
Claims (10)
1. the normal shock switching power circuit two-tube in parallel of a kind of wide range input, it is characterised in that：Including transformer T1, just
Swash the two-tube parallel circuit of formula, drive amplification and strong and weak electric isolating circuit, voltage-stabilizing protection power supply circuit and rectifying and wave-filtering freewheeling circuit；
Wherein, transformer T1 is connected with the two-tube parallel circuit of positive activation type, voltage-stabilizing protection power supply circuit and rectifying and wave-filtering freewheeling circuit respectively；
One end of the two-tube parallel circuit of positive activation type is connected with transformer T1, the other end of the two-tube parallel circuit of positive activation type and drive amplification and
It is connected with outside pwm control circuit after strong and weak electric isolating circuit series connection；Voltage-stabilizing protection power supply circuit respectively with transformer T1 and outer
Portion's control circuit power connection.
2. a kind of normal shock switching power circuit two-tube in parallel of wide range input according to claim 1, its feature
It is：The transformer T1 secondary output par, c also includes diode D1, diode D2 and inductance L1；The transformer T1 difference
It is connected with the anode of diode D1 and the anode of diode D2, the negative electrode of diode D1 and the negative electrode of diode D2 connect with inductance L1
After connecing, voltage-stabilizing protection power supply circuit is connected.
3. a kind of normal shock switching power circuit two-tube in parallel of wide range input according to claim 1, its feature
It is：Described transformer T1 includes 6 pins, respectively pin 1-6；Wherein, pin 1 connects with the two-tube parallel circuit of positive activation type
Connect；Pin 2 is connected with the two-tube parallel circuit of positive activation type；Pin 3 is connected with the anode of diode D1；Pin 4 is with diode D2's
Anode is connected；Pin 5 is connected with rectifying and wave-filtering freewheeling circuit；Pin 6 is connected with rectifying and wave-filtering freewheeling circuit.
4. a kind of normal shock switching power circuit two-tube in parallel of wide range input according to claim 3, its feature
It is：The pin 1 of the transformer T1 and the pin 2 of transformer T1 are input into primary side winding mode；The pipe of the transformer T1
The pin 4 of pin 3 and transformer T1 is exported in vice-side winding mode；The pin 5 of the transformer T1 and the pin 6 of transformer T1 with
Vice-side winding mode is exported.
5. a kind of normal shock switching power circuit two-tube in parallel of wide range input according to claim 3, its feature
It is：The two-tube parallel circuit of positive activation type includes diode D8, diode D9, resistance R16, resistance R17, metal-oxide-semiconductor Q1, MOS
Pipe Q2, metal-oxide-semiconductor Q3 and metal-oxide-semiconductor Q4；Wherein, one end of resistance R16 connects with the source electrode of metal-oxide-semiconductor Q3 and the source electrode of metal-oxide-semiconductor Q4 respectively
Connect, the other end of resistance R16 is connected with the anode of diode D9；One end of resistance R17 respectively with the source electrode and MOS of metal-oxide-semiconductor Q3
The source electrode connection of pipe Q4, the other end of resistance R17 is connected with the anode of diode D9；Resistance R16 and resistance R17 is in parallel；Metal-oxide-semiconductor
The gate pole of Q3 is connected with resistance R7；The drain electrode of metal-oxide-semiconductor Q3 is connected with the pin 2 of transformer T1；The gate pole of metal-oxide-semiconductor Q4 and resistance R6
Connection；The drain electrode of metal-oxide-semiconductor Q4 is connected with the anode of diode D8；The source electrode of metal-oxide-semiconductor Q3 is connected with the source electrode of metal-oxide-semiconductor Q4；Two poles
The negative electrode of pipe D9 is connected with the source electrode of metal-oxide-semiconductor Q1；The gate pole of metal-oxide-semiconductor Q1 is connected with resistance R3；The drain electrode of metal-oxide-semiconductor Q1 respectively with
The drain electrode of metal-oxide-semiconductor Q2 and the negative electrode connection of diode D8；The gate pole of metal-oxide-semiconductor Q2 is connected with resistance R4.
6. a kind of normal shock switching power circuit two-tube in parallel of wide range input according to claim 3, its feature
It is：The drive amplification and strong and weak electric isolating circuit include transformer T2, resistance R1, resistance R2, resistance R3, resistance R4, electricity
Resistance R5, resistance R6, resistance R7, diode D3, diode D4, diode D5, diode D6, triode Q5, triode Q6 and electricity
Hold C1；Wherein, the negative electrode of diode D5 is connected with transformer T2；One end of resistance R2 is connected with transformer T2, and resistance R2's is another
One end anode respectively with diode D5, resistance R3, resistance R4 are connected；Resistance R3, resistance R4 are two-tube with positive activation type in parallel respectively
Circuit is connected；Negative electrode of the one end of resistance R5 respectively with transformer T2 and diode D6 is connected；The other end of resistance R5 respectively with
The anode of diode D6, resistance R6, resistance R7 connections；Resistance R6, resistance R7 are connected with the two-tube parallel circuit of positive activation type respectively；Electricity
The one end for holding C1 is connected with transformer T2, the other end of electric capacity C1 anode, the negative electrode of diode D4, three respectively with diode D3
The emitter-base bandgap grading connection of the emitter-base bandgap grading, triode Q6 of pole pipe Q5；The negative electrode of diode D3 is connected with the colelctor electrode of triode Q5；Triode Q5
Base stage base stage respectively with triode Q6, one end of resistance R1 is connected；The other end of resistance R1 connects with outside pwm control circuit
Connect；The colelctor electrode of triode Q6 anode respectively with diode D4, transformer T2 are connected.
7. a kind of normal shock switching power circuit two-tube in parallel of wide range input according to claim 6, its feature
It is：The transformer T2 includes 6 pins, is pin 1-6；Wherein, the pin 1 of transformer T2 electricity in parallel two-tube with positive activation type
Road connects；The pin 2 of transformer T2 is connected with resistance R5；The pin 3 of transformer T2 is connected with the two-tube parallel circuit of positive activation type；Become
The pin 4 of depressor T2 is connected with resistance R2；The pin 5 of transformer T2 is connected with electric capacity C1；The pin 6 and diode of transformer T2
The anode connection of D4.
8. a kind of normal shock switching power circuit two-tube in parallel of wide range input according to claim 7, its feature
It is：The pin 5 and pin 6 of the transformer T2 are input into primary side winding mode；The pin 3 and transformer of the transformer T2
The pin 4 of T2 is exported in vice-side winding mode；The pin 1 of the transformer T2 and the pin 2 of transformer T2 are with vice-side winding side
Formula is exported.
9. a kind of normal shock switching power circuit two-tube in parallel of wide range input according to claim 3, its feature
It is：The voltage-stabilizing protection power supply circuit includes control chip U1, electric capacity C2, electric capacity C3, electric capacity C4, resistance R8, resistance R9, electricity
Resistance R10, resistance R11, resistance R12, resistance R13, resistance R14, resistance R15, diode D7 and inductance L2；Wherein, control chip
The FB ends of U1 are connected with resistance R14, resistance R15 respectively；The VCC ends of control chip U1 are connected with electric capacity C4；Control chip U1's
BST ends are connected with electric capacity C3；The SW ends of control chip U1 are connected with inductance L2 and electric capacity C3 respectively；Inductance L2 and resistance R14, two
The anode connection of pole pipe D7；The negative electrode of diode D7 is connected with external control circuit power supply；The RON ends of control chip U1 and resistance
One end connection of R13；The UVLO ends of control chip U1 are connected with resistance R11, resistance R12 respectively；The RTN terminations of control chip U1
Ground；After resistance R11 and resistance R12 series connection, the first parallel circuit is constituted with electric capacity C2, resistance R8, resistance R9, resistance R10 respectively,
First parallel circuit VIN ends respectively with control chip U1, inductance L1 are connected.
10. a kind of normal shock switching power circuit two-tube in parallel of wide range input according to claim 3, its feature
It is：The rectifying and wave-filtering freewheeling circuit includes binary diode D10, binary diode D11, inductance L3, electric capacity C5, electric capacity
C6, electric capacity C7, electric capacity C8, resistance R33 and resistance R34；Wherein, connect with transformer T1 after the anode parallel connection of binary diode D10
Connect；The negative electrode of binary diode D10 negative electrode respectively with binary diode D11, inductance L3 are connected；Electric capacity C5, electric capacity C6, electric capacity
C7, electric capacity C8, resistance R33 and resistance R34 constitute the second parallel circuit, second parallel circuit respectively with inductance L3, binary
The anode connection of diode D11.
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| CN201710201283.XA CN106877675A (en) | 2017-03-30 | 2017-03-30 | A kind of normal shock switching power circuit two-tube in parallel of wide range input |
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Application publication date: 20170620 |