CN107919801A - A kind of inverse-excitation type switch power-supply circuit - Google Patents
A kind of inverse-excitation type switch power-supply circuit Download PDFInfo
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- CN107919801A CN107919801A CN201711307401.1A CN201711307401A CN107919801A CN 107919801 A CN107919801 A CN 107919801A CN 201711307401 A CN201711307401 A CN 201711307401A CN 107919801 A CN107919801 A CN 107919801A
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Classifications
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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
- H02M3/33507—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 with automatic control of the output voltage or current, e.g. flyback converters
- H02M3/33523—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 with automatic control of the output voltage or current, e.g. flyback converters with galvanic isolation between input and output of both the power stage and the feedback loop
Abstract
The present invention provides a kind of inverse-excitation type switch power-supply circuit, including：High frequency transformer, receives the voltage input signal of power supply, after carrying out voltage transformation, sends to output circuit；Output circuit is connected with high frequency transformer and feedback circuit, and the transformed voltage output signal of high frequency transformer is passed through in output；Feedback circuit is connected with output circuit and control circuit, and the voltage output signal exported according to output circuit generates feedback signal, feeds back to control circuit；Control circuit is connected with feedback circuit and high frequency transformer, receives the feedback signal of feedback circuit, according to the duty cycle and frequency of feedback signal adjusting pulsewidth modulation output signal；Voltage detecting regulator circuit is connected with power supply and control circuit, remains unchanged the maximum duty cycle of control circuit output pulse-width signal.By applying the present invention, playing defencive function when under-voltage and over-pressed situation occurs in control source, the input range of voltage can be expanded, meet the needs of different electrical power control source specification.
Description
Technical field
The present invention relates to switch power technology field, and in particular to a kind of inverse-excitation type switch power-supply circuit.
Background technology
Power supply is the power core of electronic product, and the voltage specification of different products is inconsistent, or even a product is not
Supply voltage input specification under same use environment is also inconsistent, such as, 18V, 24V, 36V, 48V, the demand such as 60V, 72V.
In the prior art, the voltage source of power is provided for product, control source specification is more single, and is being designed without considering to electricity
The under-voltage and over-pressed phenomenon that pressure input produces play a protective role, and cause to meet different electrical power control source specification
Demand.
The content of the invention
Therefore, the present invention solve voltage product-derived of the prior art cannot to control source produce under-voltage and
Cross and be pressed with defencive function, it is impossible to meet the problem of the needs of different electrical power control source specification, opened so as to provide a kind of inverse-excitation type
Powered-down source circuit, can expand the input range of voltage.
The present invention provides a kind of inverse-excitation type switch power-supply circuit, including：It is high frequency transformer, output circuit, control circuit, anti-
Current feed circuit and voltage detecting regulator circuit, wherein：The high frequency transformer is used for the voltage input signal for receiving power supply, by institute
State voltage input signal and carry out voltage transformation, send to the output circuit；One end of the output circuit becomes with the high frequency
Depressor is connected, and the other end is connected with the feedback circuit, and the output circuit is used to export to be changed by high frequency transformer
Voltage output signal afterwards；One end of the feedback circuit is connected with the output circuit, and the other end connects with the control circuit
Connect, the voltage output signal that the feedback circuit is used to be exported according to the output circuit generates feedback signal, feeds back to described
Control circuit；One end of the control circuit is connected with the feedback circuit, and the other end is connected with the high frequency transformer,
The control circuit is used for the feedback signal for receiving the feedback circuit, and output letter is modulated according to the feedback signal adjusting pulsewidth
Number duty cycle and frequency；One end of the voltage detecting regulator circuit is connected with the power supply, the other end and the control electricity
Road is connected, and the voltage detecting regulator circuit is used to make the maximum duty cycle of control circuit output pulse-width signal to keep not
Become.
Preferably, the voltage detecting regulator circuit includes：First resistor, second resistance, 3rd resistor, the one or two pole
Pipe, wherein：The cathode of first diode is connected by first resistor with the high frequency transformer；The second resistance
One end is connected between first diode and first resistor, and the other end of the second resistance and one end of 3rd resistor connect
Connect, the other end ground connection of the 3rd resistor；The cathode of first diode passes through second resistance and the switch power supply
Road is connected, the plus earth of first diode.
Preferably, the inverse-excitation type switch power-supply circuit, further includes：Soft starting circuit, the one of the soft starting circuit
End is connected with the output circuit, and the other end is connected with the feedback circuit, for reducing the driving of the feedback circuit
Voltage.
Preferably, the inverse-excitation type switch power-supply circuit, the control circuit include the Switching Power Supply device of built-in mos pipes
Part.
Preferably, the inverse-excitation type switch power-supply circuit further includes：Frequency regulator part, the frequency regulator part and institute
The switching power source device for stating built-in mos pipes is connected, the output frequency of the switching power source device for adjusting the built-in mos pipes
Rate.
Preferably, the inverse-excitation type switch power-supply circuit further includes：Input circuit, the input circuit include：Filtered electrical
Road, the filter circuit include：Differential mode filter part and common mode filtering device, wherein：The differential mode filter part, for filtering out
DM EMI signal in the voltage input signal, and the DM EMI letter that the inverse-excitation type switch power-supply circuit produces
Number；The common mode filtering device, for filtering out the common mode interference signal in the voltage input signal, and the inverse-excitation type is opened
The common mode interference signal that powered-down source circuit produces.
Preferably, the input circuit further includes：Shaping circuit, the shaping circuit are defeated for the voltage in the power supply
When to enter signal be AC signal, halfwave rectifier or full-wave rectification are carried out to the AC signal, the AC signal is converted to
Direct current signal.
Preferably, the filter circuit further includes：Power supply ripple filtering device, passes through institute for filtering out voltage input signal
State the ripple produced after shaping circuit.
Preferably, the output circuit includes：Main output circuit, reference circuit, wherein：One end of the main output circuit
It is connected with the high frequency transformer, the other end is connected with the reference circuit, believes for exporting the voltage output to load
Number, provide electric energy for load；One end of the reference circuit is connected with the main output circuit, the other end and the feedback electricity
Road is connected, for adjusting the voltage output signal of the main output circuit to preset voltage value.
Preferably, the inverse-excitation type switch power-supply circuit, further includes：Discharge loop, one end of the discharge loop and institute
State filter circuit to be connected, the other end is connected with the high frequency transformer, for discharging the electricity of the self-induction on high frequency transformer
Kinetic potential energy.
Preferably, the inverse-excitation type switch power-supply circuit further includes：Auxiliary power supply circuit, the auxiliary power supply circuit
One end is connected with the high frequency transformer, and the other end is connected with the control circuit, in the control circuit
The switching power source device for putting mos pipes provides power supply.
Technical solution of the present invention, has the following advantages that：
The present invention provides a kind of inverse-excitation type switch power-supply circuit, including：High frequency transformer, receives the control source letter of power supply
Number, after carrying out voltage transformation, send to output circuit；Output circuit is connected with high frequency transformer and feedback circuit, output warp
Cross the transformed voltage output signal of high frequency transformer；Feedback circuit is connected with output circuit and control circuit, according to output electricity
The voltage output signal generation feedback signal of road output, feeds back to control circuit；Control circuit and feedback circuit and high frequency voltage
Device is connected, and receives the feedback signal of feedback circuit, according to the duty cycle and frequency of feedback signal adjusting pulsewidth modulation output signal
Rate；Voltage detecting regulator circuit is connected with power supply and control circuit, accounts for the maximum of control circuit output pulse-width signal
Empty ratio remains unchanged.The present invention can play defencive function when under-voltage and over-pressed situation occurs in control source, expand voltage
Input range, meet the needs of different electrical power control source specification.
Brief description of the drawings
, below will be to specific in order to illustrate more clearly of the specific embodiment of the invention or technical solution of the prior art
Embodiment or attached drawing needed to be used in the description of the prior art are briefly described, it should be apparent that, in describing below
Attached drawing is some embodiments of the present invention, for those of ordinary skill in the art, before not making the creative labor
Put, other attached drawings can also be obtained according to these attached drawings.
Fig. 1 is the functional block diagram of a specific example of the inverse-excitation type switch power-supply circuit in the embodiment of the present invention 1；
Fig. 2 is the schematic diagram of a specific example of the inverse-excitation type switch power-supply circuit in the embodiment of the present invention 1；
Fig. 3 is the functional block diagram of another specific example of the inverse-excitation type switch power-supply circuit in the embodiment of the present invention 1.
Reference numeral：
1- high frequency transformers；2- output circuits；
Other output circuits of 11-；The main output circuits of 21-；
3- feedback circuits；4- control circuits；
5- voltage detecting regulator circuit 6- soft starting circuits；
7- frequency adjustment circuits；8- input circuits；
81- filter circuits；82- shaping circuits；
83- device of surge protector；84- short-circuit protection devices；
9- discharge loops；10- auxiliary power supply circuits；
Other output circuits of 11-.
Embodiment
Technical scheme is clearly and completely described below in conjunction with attached drawing, it is clear that described implementation
Example is part of the embodiment of the present invention, instead of all the embodiments.Based on the embodiments of the present invention, ordinary skill
Personnel's all other embodiments obtained without making creative work, belong to the scope of protection of the invention.
In the description of the present invention, it is necessary to which explanation, term " first ", " second ", " the 3rd " etc. are only used for description mesh
, and it is not intended that instruction or hint relative importance.Unless otherwise clearly defined and limited, term " installation ", " phase
Even ", " connection " should be interpreted broadly, for example, it may be being fixedly connected or being detachably connected, or be integrally connected；Can
To be mechanical connection or be electrically connected；It can be directly connected, can also be indirectly connected by intermediary, can be with
It is the connection inside two elements, can is wireless connection or wired connection.For those of ordinary skill in the art
For, the concrete meaning of above-mentioned term in the present invention can be understood with concrete condition.
As long as in addition, technical characteristic involved in invention described below different embodiments non-structure each other
It can be combined with each other into conflict.
Embodiment 1
The embodiment of the present invention provides a kind of inverse-excitation type switch power-supply circuit, as shown in Figure 1, the inverse-excitation type switch power-supply circuit
Mainly include：High frequency transformer 1, output circuit 2, feedback circuit 3, control circuit 4 and voltage detecting regulator circuit 5.
Wherein, which is used for the voltage input signal for receiving power supply, and voltage input signal is carried out voltage change
Change, send to output circuit 2.In the embodiment of the present invention, as shown in Fig. 2, high frequency transformer 1 is TC1, it is responsible for the voltage change
Current signal, is coupled to each winding, plays the role of energy transmission.
One end of output circuit 2 is connected with high frequency transformer 1, and the other end is connected with feedback circuit 4, output circuit 2
For exporting the voltage output signal after high frequency transformer 1 changes.
In a preferred embodiment, as shown in figure 3, output circuit 2 includes：Main output circuit 21, reference circuit 22, its
In：One end of main output circuit 21 is connected with high frequency transformer 1, and the other end is connected with reference circuit 22, for defeated to loading
Go out voltage output signal, electric energy is provided for load.In the embodiment of the present invention, as shown in Fig. 2, main output circuit 21 is by diode
D3, capacitance C8, capacitance C9, inductance L1, capacitance C14, the π type filter circuits of capacitance C15 compositions, reference circuit 22 is by reference voltage
Source U3, resistance R14, resistance R15, resistance R12 and resistance R18 composition, reference circuit 22 sampling be in π type filter circuits rear end,
And the sampling apparent π type filter circuits front end of feedback circuit 3, so greatly reduce output ripple.One end of reference circuit 22
It is connected with main output circuit 21, the other end is connected with feedback circuit 3, for by the voltage output signal of main output circuit 21
Adjust to preset voltage value.
One end of feedback circuit 3 is connected with output circuit 2, and the other end is connected with control circuit 4, and feedback circuit 3 is used for root
The voltage output signal exported according to output circuit 2 generates feedback signal, feeds back to control circuit 4.In the embodiment of the present invention, such as scheme
Shown in 2, feedback circuit 3 is by resistance R11, resistance R14, photodiode U2, reference voltage source U3, resistance R17, resistance
R10, resistance R5, capacitance C11, resistance R8 compositions, after main circuit voltage raises, the electric current for flowing through photodiode U2 also increases
Adding, the voltage at the FB of Simultaneous Switching power supply apparatus UI can increase, and the waveform duty cycle of PWM (pulsewidth modulation) outputs can be reduced,
The energy of transmission is reduced.The voltage of main output circuit 21 declines.A negative-feedback is formed, voltage reaches a stabilization at final FB
Voltage.
One end of control circuit 4 is connected with feedback circuit 3, and the other end is connected with high frequency transformer 1, control circuit 4
For receiving the feedback signal of feedback circuit 3, according to the duty cycle and frequency of feedback signal adjusting pulsewidth modulation output signal.This
In inventive embodiments, control circuit 4 is the Switching Power Supply of a built-in mos pipe, and the mos of built-in stress levels at least 150V is managed.
The feedback signal of feedback circuit 3, adjustment mos pipes output PWM duty cycle and frequency are received at the same time.Such as in the embodiment of the present invention
The Switching Power Supply U1 of built-in mos pipes, model MP6001.
One end of voltage detecting regulator circuit 5 is connected with power supply, and the other end is connected with control circuit 4, and voltage detecting is steady
Volt circuit 5 is used to remain unchanged the maximum duty cycle of 4 output pulse width modulated signal of control circuit.In one embodiment, such as Fig. 2
Shown, voltage detecting regulator circuit 5 includes：First resistor R2, second resistance R4,3rd resistor R6, the first diode D4, its
In：The cathode of first diode D4 is connected by first resistor R2 with high frequency transformer；One end of second resistance R4 is connected to
Between first diode D4 and first resistor R2, the other end of second resistance R4 is connected with one end of 3rd resistor R6, the 3rd electricity
Hinder the other end ground connection of R6；The cathode of first diode D4 is connected by second resistance R4 with switching power circuit, and the one or two
The plus earth of pole pipe D4.The first diode D4 is a zener diode in a preferred embodiment.
Different input voltages, is adjusted to same voltage by voltage detecting regulator circuit 5, then accesses Switching Power Supply device
The voltage of part U1 checks pin.Make the PWM maximum output duty cycles of U1 devices constant, meanwhile, widen power input scope.
In the embodiment of the present invention, in control source than in the case of relatively low, the voltage on the first diode D4 does not reach surely
The minimum voltage of pressure, at this moment the first diode D4 do not work.And it is the voltage on the 2nd foot that switching power source device U1, which has a characteristic,
V2 is lower, and the maximum duty cycle of the PWM waveform of the 8 feet output of switching power source device U1 is bigger.Voltage V2 on 2nd foot is less than U1
Chip it is minimum check voltage when, switching power source device U1 does not work.When the voltage on D4 reaches the minimum voltage of voltage stabilizing, first
Diode D4 can be adjusted to this voltage one stable voltage, so that the voltage on the 2nd feet of U1 becomes a stable electricity
Pressure, while the PWM waveform maximum duty cycle of the 8 feet output of U1 is constant.It ensure that in the case where control source is higher, U1
On 2 feet voltage will not be excessive and burn out chip, while U1 overvoltage detection defencive function also do not work, ensure that control source ratio
In the case of higher, the normal work of inverse-excitation type switch power-supply circuit.
In a preferred embodiment, as shown in figure 3, above-mentioned inverse-excitation type switch power-supply circuit further includes：Soft starting circuit 6,
One end of soft starting circuit 6 is connected with output circuit 4, and the other end is connected with feedback circuit 3, for reducing feedback circuit
Driving voltage.In the embodiment of the present invention, as shown in figure 3, diode D8, diode D9, resistance R21, capacitance C19, resistance R11,
Resistance R14, phototriode U2 form the soft starting circuit 3, its operation principle is：When flyback switching in the embodiment of the present invention
Power circuit just powered on and input voltage than it is relatively low when, cause the voltage of main output circuit 21 than relatively low, reference voltage source U3 because
It cannot get enough voltage and cisco unity malfunction, the output of reference voltage source U3 are relatively low, so that by resistance R12, light-emitting diodes
The circuit cisco unity malfunction that pipe D and reference voltage source U3 are collectively constituted, the PWM chip inside of control circuit 4 is because cannot
Feedback signal and stop, whole inverse-excitation type switch power-supply circuit can not work normally.
After adding soft starting circuit 6, circuit is formed by resistance R2, light emitting diode D, diode D9 and capacitance C19, firm
At this moment powered on moment, capacitance C19 have electric current to flow through light emitting diode D, feedback signal Normal Feedback to control equivalent to short-circuit condition
4 adjusting switch frequency of circuit or duty cycle processed, improve the output voltage of main output circuit 21, due to resistance R11 and capacitance C19
RC charging circuit time constants it is very short, capacitance C19 is fully charged quickly, while the voltage on reference voltage source U3 rises to normally
Operational voltage level, the benchmark of reference voltage source U3 outputs are controlled on the voltage stabilization of main output circuit 21 to default voltage
Circuit 4 processed can normally start, and also be worked normally by resistance R11, light emitting diode D and reference voltage source the U3 circuit formed.
In a preferred embodiment, as shown in figure 3, above-mentioned inverse-excitation type switch power-supply circuit further includes：Frequency regulator part
7, frequency regulator part 7 is connected with the switching power source device of built-in mos pipes, for adjusting the Switching Power Supply device of built-in mos pipes
The output frequency of part U1.As shown in Fig. 2, in the embodiment of the present invention, frequency adjustment circuit 7 is made of resistance R7 and capacitance C3, is adjusted
The value of economize on electricity resistance R7 can change the frequency of the PWM outputs of switching power source device U1, and capacitance C3 plays the role of filtering.Designing
, it is necessary to be designed according to the working frequency of power supply during high frequency transformer 1.Analyzed from switch power efficiency, this frequency it is more big more
It is good.But radiated from EMI (Electromagnetic Interference electromagnetic interferences) to analyze, this frequency cannot require
It is very big, to need one suitable frequency of selection to determine the value of R7 according to practical application.
In a preferred embodiment, as shown in figure 3, above-mentioned inverse-excitation type switch power-supply circuit further includes：Input circuit 8, bag
Include：Filter circuit 81, the filter circuit 81 mainly include：Differential mode filter part and common mode filtering device.
Wherein, the differential mode filter part, for filtering out the DM EMI signal in voltage input signal, and inverse-excitation type is opened
The DM EMI signal that powered-down source circuit produces；Common mode filtering device, for filtering out the letter of the common mode interference in voltage input signal
Number, and the common mode interference signal that inverse-excitation type switch power-supply circuit produces.As shown in figure 3, in the embodiment of the present invention, capacitance C16
For DM EMI signal, inductance L200 is used for filtering common mode interference signal.
In a preferred embodiment, as shown in figure 3, input circuit 8 further includes：Shaping circuit 82, for the electricity in power supply
When pressure input signal is AC signal, halfwave rectifier or full-wave rectification are carried out to AC signal, AC signal is converted into direct current
Signal.In the embodiment of the present invention, as shown in figure 3, shaping circuit 82 forms for device D200, D201, D202, D203.Correspondingly,
Filter circuit 61 further includes：Power supply ripple filtering device C7 and C2, are produced for filtering out voltage input signal after shaping circuit
Raw DC ripple.
In a preferred embodiment, as shown in figure 3, input circuit 8 further includes：Short-circuit protection device 84 and Surge Protector
Part 83, in the embodiment of the present invention, short-circuit protection device 84 is thermistor or fuse F1, has short-circuit protection function.Wave
Surge protector part 83 is varistor RV200, has the function of to absorb surge.
In one preferably embodiment, as shown in figure 3, above-mentioned inverse-excitation type switch power-supply circuit, further includes：Discharge loop 9,
One end of discharge loop 9 is connected with filter circuit, and the other end is connected with high frequency transformer 1, for discharging high frequency transformer 1
On the electronic potential energy of self-induction.Discharge loop 9 is by diode D2, diode D21, resistance R1, resistance in the embodiment of the present invention
R3, capacitance C4 are formed, and are after switching power source device U1 shut-offs, high frequency transformer 1 inputs winding because shut-off can produce suddenly
One and the reverse electromotive force of input voltage, have very big energy.If this energy is added and switched without release
After power supply apparatus U1 is again switched on, switching power source device U1 and high frequency transformer 1 there is a possibility that to be burned, discharge loop 9
After 1 current loop of high frequency transformer is turned off, the electronic potential energy quick release of self-induction on high frequency transformer 1, prevent
It is burned.
In a preferred embodiment, as shown in figure 3, above-mentioned inverse-excitation type switch power-supply circuit, further includes：Auxiliary power supply circuit
10, one end of the auxiliary power supply circuit 10 is connected with high frequency transformer 1, and the other end is connected with control circuit 4, for
The switching power source device U1 of control circuit 4 provides power supply.Auxiliary power supply circuit 10 is to provide a power supply to U1, makes its more stable
Work, while it is the startup speed for increasing switching power source device U1 just to have powered on.When this partial circuit does not have, Switching Power Supply device
7 pins of part U1 can directly take electricity from power input, and start-up course is slower.
In one preferably implements, as shown in Fig. 2, above-mentioned inverse-excitation type switch power-supply circuit, diode D1, capacitance C5, capacitance
C6 and one group of transformer auxiliary winding can form other voltage outputs 11 in addition all the way, electricity required for providing it for load
Pressure.
Inverse-excitation type switch power-supply circuit provided in an embodiment of the present invention, when under-voltage and over-pressed situation occurs in control source
Defencive function is played, the input range of voltage in the prior art can be expanded, meets the needs of different electrical power control source specification.
Obviously, the above embodiments are merely examples for clarifying the description, and the restriction not to embodiment.It is right
For those of ordinary skill in the art, can also make on the basis of the above description it is other it is various forms of change or
Change.There is no necessity and possibility to exhaust all the enbodiments.And the obvious change thus extended out or
Among changing still in the protection domain of the invention.
Claims (11)
- A kind of 1. inverse-excitation type switch power-supply circuit, it is characterised in that including：It is high frequency transformer, output circuit, control circuit, anti- Current feed circuit and voltage detecting regulator circuit, wherein：The high frequency transformer is used for the voltage input signal for receiving power supply, and the voltage input signal is carried out voltage transformation, Send to the output circuit；One end of the output circuit is connected with the high frequency transformer, and the other end is connected with the feedback circuit, described Output circuit, which is used to export, passes through the transformed voltage output signal of high frequency transformer；One end of the feedback circuit is connected with the output circuit, and the other end is connected with the control circuit, the feedback electricity The voltage output signal that road is used to be exported according to the output circuit generates feedback signal, feeds back to the control circuit；One end of the control circuit is connected with the feedback circuit, and the other end is connected with the high frequency transformer, described Control circuit is used for the feedback signal for receiving the feedback circuit, according to the feedback signal adjusting pulsewidth modulation output signal Duty cycle and frequency；One end of the voltage detecting regulator circuit is connected with the power supply, and the other end is connected with the control circuit, described Voltage detecting regulator circuit is used to remain unchanged the maximum duty cycle of control circuit output pulse-width signal.
- 2. inverse-excitation type switch power-supply circuit according to claim 1, it is characterised in that the voltage detecting regulator circuit bag Include：First resistor (R2), second resistance (R4), 3rd resistor (R6), the first diode (D4), wherein：The cathode of first diode (D4) is connected by first resistor (R2) with the high frequency transformer；One end of the second resistance (R4) is connected between first diode (D4) and first resistor (R2), and described second The other end of resistance (R4) is connected with one end of 3rd resistor (R6), the other end ground connection of the 3rd resistor (R6)；The cathode of first diode (D4) is connected by second resistance (R4) with the switching power circuit, and described first The plus earth of diode (D4).
- 3. inverse-excitation type switch power-supply circuit according to claim 1, it is characterised in that further include：Soft starting circuit, it is described One end of soft starting circuit is connected with the output circuit, and the other end is connected with the feedback circuit, described for reducing The driving voltage of feedback circuit.
- 4. according to claim 1-3 any one of them inverse-excitation type switch power-supply circuits, it is characterised in that the control circuit bag Include the switching power source device of built-in mos pipes.
- 5. inverse-excitation type switch power-supply circuit according to claim 4, it is characterised in that further include：Frequency adjustment circuit, institute The switching power source device that frequency adjustment circuit is stated with the built-in mos pipes is connected, for adjusting the switch of the built-in mos pipes The output frequency of power supply apparatus.
- 6. inverse-excitation type switch power-supply circuit according to claim 1, it is characterised in that further include：Input circuit, it is described defeated Entering circuit includes：Filter circuit, the filter circuit include：Differential mode filter part and common mode filtering device, wherein：The differential mode filter part, for filtering out the DM EMI signal in the voltage input signal, and the inverse-excitation type The DM EMI signal that switching power circuit produces；The common mode filtering device, for filtering out the common mode interference signal in the voltage input signal, and the inverse-excitation type The common mode interference signal that switching power circuit produces.
- 7. inverse-excitation type switch power-supply circuit according to claim 6, it is characterised in that the input circuit further includes：It is whole Shape circuit, the shaping circuit be used for when the voltage input signal of the power supply is AC signal, to the AC signal into Row halfwave rectifier or full-wave rectification, direct current signal is converted to by the AC signal.
- 8. inverse-excitation type switch power-supply circuit according to claim 7, it is characterised in that the filter circuit further includes：Electricity Source ripple filter part, the ripple produced for filtering out voltage input signal after the shaping circuit.
- 9. inverse-excitation type switch power-supply circuit according to claim 1, it is characterised in that the output circuit includes：Master is defeated Go out circuit, reference circuit, wherein：One end of the main output circuit is connected with the high frequency transformer, and the other end is connected with the reference circuit, is used for The voltage output signal is exported to load, electric energy is provided for load；One end of the reference circuit is connected with the main output circuit, and the other end is connected with the feedback circuit, is used for The voltage output signal of the main output circuit is adjusted to preset voltage value.
- 10. inverse-excitation type switch power-supply circuit according to claim 6, it is characterised in that further include：Discharge loop, it is described One end of discharge loop is connected with the filter circuit, and the other end is connected with the high frequency transformer, for discharging high frequency The electronic potential energy of self-induction on transformer.
- 11. inverse-excitation type switch power-supply circuit according to claim 10, it is characterised in that further include：Auxiliary power supply circuit, One end of the auxiliary power supply circuit is connected with the high frequency transformer, and the other end is connected with the control circuit, is used for Switching power source device to the built-in mos pipes of the control circuit provides power supply.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711307401.1A CN107919801A (en) | 2017-12-11 | 2017-12-11 | A kind of inverse-excitation type switch power-supply circuit |
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| CN201711307401.1A CN107919801A (en) | 2017-12-11 | 2017-12-11 | A kind of inverse-excitation type switch power-supply circuit |
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| CN201711307401.1A Pending CN107919801A (en) | 2017-12-11 | 2017-12-11 | A kind of inverse-excitation type switch power-supply circuit |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
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Application publication date: 20180417 |