CN107579648A - A kind of inverse-excitation type switch power-supply and its control circuit - Google Patents
A kind of inverse-excitation type switch power-supply and its control circuit Download PDFInfo
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Abstract
The present invention relates to a kind of inverse-excitation type switch power-supply and its control circuit, the control circuit includes being used to export the pulse modulation controller that PWM is turned on and turned off with driving switch pipe, the output end of the comparison port connection adjustment control module of the pulse modulation controller, the adjustment control module includes controllable accurate source of stable pressure, the sampling end of the controllable accurate source of stable pressure is used to connect output voltage signal, also include overload protection module, the overload protection module includes first comparator, the in-phase input end of the first comparator is used to connect output current signal, inverting input connects first reference value, output end connects the sampling end of the controllable accurate source of stable pressure.The present invention is controlled according to the change of both output voltage and overload current signal to output voltage, and reliability is high, improves dynamic responding speed, so as to be precisely controlled switching frequency, adjusts dutycycle.
Description
Technical field
The invention belongs to switch power technology field, and in particular to a kind of inverse-excitation type switch power-supply and its control circuit.
Background technology
Switching Power Supply is to utilize modern power electronics technology, the time ratio that controlling switch pipe turns on and off, and remains steady
Determine a kind of power supply of output voltage, be typically made up of pulse width modulation control single chip computer and MOSFET.At present, Switching Power Supply with
Small-sized, light weight and efficient feature, are widely used in the fields such as industrial automatic control, military industry equipment, research equipment, are
Current electronics and information industry develops rapidly a kind of indispensable power mode.
Isolating transformer is introduced in the DC/DC converters such as basic Buck, Boost and Cuk, converter can be made
Electrical isolation is realized between input power and load, improves the security reliability and Electro Magnetic Compatibility of converter operation, main bag
Include positive activation type Switching Power Supply and inverse-excitation type switch power-supply.Wherein, inverse-excitation type switch power-supply is compared to positive activation type Switching Power Supply, because of it
The features such as simple in construction, cheap, input range is wide, receives much concern, suitable for a variety of voltage class occasions, extensively
Applied in various accessory power supplys and small-power power.
Single switch flyback converter main switch, it opens larger with shut-off voltage stress, it is difficult to the occasion higher for voltage.
And the main switch voltage stress of double-transistor flyback converter is only input voltage, and leakage inductance energy can feed back to input side, without increasing
Add any absorbing circuit, thus overall efficiency is also higher, using double-tube series technology, it is highly suitable for higher input electricity
The occasion of pressure and high performance requirements.
Inverse-excitation type switch power-supply is typically realized stable to realize the stabilization of output by loop.Wherein, it is most classical, should
It is secondary opto-coupled feedback loop control methods with extremely wide mode.
The control method typically uses this quasi- integrated circuits of three end groups of TL431, and structure is as shown in Figure 1.Wherein, U5 is
TL431, R5, R6, C2, C3, R9, R10 form adjustment control module.U5 sampling end is connected with output voltage by resistance R9 to be believed
Number, to control it.
The circuit samples to output voltage signal, and when output voltage raises, TL431 absorption electric current becomes big, stream
The electric current for crossing isolation optocoupler U2 becomes big, and also direct proportion becomes big to the electric current of isolation optocoupler U2 output end, PDM keyer U3
Output makes the dutycycle of the Switching Power Supply of primary side diminish, and so the energy by flyback transformer T1 outputs diminishes so that flyback
The output voltage of formula Switching Power Supply drops to output voltage preset value；When output voltage declines, TL431 output current becomes
Small, the electric current for flowing through optocoupler U2 diminishes, and the electric current of optocoupler U2 output end also diminishes, and PDM keyer U3 outputs make primary side
The dutycycle of Switching Power Supply become big, the energy quantitative change so exported by flyback transformer T1 is big so that inverse-excitation type switch power-supply
Output voltage rise to output voltage preset value.
The control method is only controlled to output voltage, and stability, the reliability of power supply overall performance are relatively low.
The content of the invention
It is an object of the invention to provide a kind of inverse-excitation type switch power-supply and its control circuit, to solve only to output electricity
Pressure stability of power supply overall performance when being controlled, the problem of reliability is relatively low.
In order to solve the above technical problems, the technical scheme is that：
The present invention a kind of inverse-excitation type switch power-supply control circuit, including for export PWM with driving switch pipe conducting with
The pulse modulation controller of shut-off, the output end of the comparison port connection adjustment control module of the pulse modulation controller, institute
Stating adjustment control module includes controllable accurate source of stable pressure, and the sampling end of the controllable accurate source of stable pressure is used to connect output voltage letter
Number, in addition to overload protection module, the overload protection module include first comparator, the homophase input of the first comparator
Hold for connecting output current signal, inverting input connection first reference value, output end connects the controllable accurate source of stable pressure
Sampling end.
Further, the sampling end of the controllable accurate source of stable pressure passes through the first capacitance connection output voltage signal, output
The primary side of the first isolation optocoupler of end connection, the secondary of the first isolation optocoupler connect the comparison port of the pulse modulation controller.
Further, control circuit also includes output voltage overvoltage protective module, the output voltage overvoltage protective module
Including the second comparator, the in-phase input end of second comparator is used to connect output voltage signal, inverting input connection
Second a reference value, output end connect the primary side of the second isolation optocoupler, and the secondary of the second isolation optocoupler connects the impulse modulation control
The comparison port of device processed.
Further, control circuit also includes input voltage protection module, and the input voltage protection module includes connection
The resistor voltage divider circuit of inlet highway voltage signal, the resistor voltage divider circuit divide pulse modulation controller described in press bond
Partial pressure port.
Further, control circuit also includes the startup voltage limitation for connecting the supply port of the pulse modulation controller
Module, the startup voltage limits module include a triode, emitter grounding, and colelctor electrode connects input mother by pull-up resistor
Line voltage signal, colelctor electrode are also connected with supply port；The inlet highway voltage signal connects by the partial pressure of resistance and voltage-stabiliser tube
It is connected to the base stage of the triode.
A kind of inverse-excitation type switch power-supply of the present invention, including transformer, in addition to led for exporting PWM with driving switch pipe
The logical pulse modulation controller with shut-off, the output of the comparison port connection adjustment control module of the pulse modulation controller
End, the adjustment control module include controllable accurate source of stable pressure, and the sampling end of the controllable accurate source of stable pressure, which is used to connect, to be exported
Voltage signal, in addition to overload protection module, the overload protection module include first comparator, the first comparator it is same
Phase input is used to connect output current signal, inverting input connection first reference value, and output end connects the controllable accurate
The sampling end of source of stable pressure.
Further, the sampling end of the controllable accurate source of stable pressure passes through the first capacitance connection output voltage signal, output
The primary side of the first isolation optocoupler of end connection, the secondary of the first isolation optocoupler connect the comparison port of the pulse modulation controller.
Further, in addition to output voltage overvoltage protective module, the output voltage overvoltage protective module include second
Comparator, the in-phase input end of second comparator are used to connect output voltage signal, and inverting input connects the second benchmark
Value, output end connect the primary side of the second isolation optocoupler, and the secondary of the second isolation optocoupler connects the ratio of the pulse modulation controller
Compared with port.
Further, in addition to input voltage protection module, the input voltage protection module include connection inlet highway
The resistor voltage divider circuit of voltage signal, the partial pressure end for dividing pulse modulation controller described in press bond of the resistor voltage divider circuit
Mouthful.
Further, the startup voltage limit module of the supply port of the connection pulse modulation controller, institute are included
Stating startup voltage limits module includes a triode, emitter grounding, and colelctor electrode passes through pull-up resistor and connects inlet highway voltage
Signal, colelctor electrode are also connected with supply port；The inlet highway voltage signal is connected to institute by the partial pressure of resistance and voltage-stabiliser tube
State the base stage of triode.
Beneficial effects of the present invention：
The inverse-excitation type switch power-supply control circuit of the present invention, can be applied to inverse-excitation type switch power-supply, existing to output
On the basis of voltage carries out the control of secondary opto-coupled feedback loop, overload protection module is added, i.e., according to output voltage and electric current
Overload signal come by adjustment control module to change adjustment control module output current size, pulse modulation controller according to
The size of the electric current adjusts output signal dutycycle, finally changes output voltage, so as to reach the purpose of voltage stabilizing.The present invention
Output voltage is controlled according to the change of both output voltage and current overload signal, electricity is exported relative to single pass
When pressure is to be controlled, reliability is high, improves dynamic responding speed, so as to be precisely controlled switching frequency, adjusts dutycycle.And
And the controling circuit structure is simple, cost is low, and small volume, use range is wide, and the control and driving force to circuit are higher.
Further, inverse-excitation type switch power-supply and its control circuit, devise including output voltage overvoltage protection, input electricity
Press the multilayer protection circuit including overvoltage protection so that the security of the inverse-excitation type switch power-supply and its control circuit, reliability
Higher, electromagnetic interference is small, strong antijamming capability so that circuit is more stable.
Brief description of the drawings
Fig. 1 is the secondary opto-coupled feedback loop control method circuit diagram of prior art；
Fig. 2 is the switching power source control circuit figure of the present invention.
Embodiment
To make the objects, technical solutions and advantages of the present invention clearer, below in conjunction with the accompanying drawings and embodiment, to the present invention
It is described in further detail.
The inverse-excitation type switch power-supply of the present invention, including the electricity of the input filter for being filtered to the high pressure of dc bus
Road, by two series connection metal-oxide-semiconductor, transformer, output filter circuit and control circuits form.Transformer drive control two
The conducting of metal-oxide-semiconductor is discharged with shut-off with entering line transformer charging with inverse-excitation type.Wherein, control circuit is as shown in Figure 2.
Generally, the control circuit forms adjustment control module to output voltage and electric current by controllable accurate source of stable pressure U5
Control is adjusted in overload signal, is realized by isolation optocoupler U1, U2 and primary side, the isolation of secondary, U3 are controlled for impulse modulation
Device, PWM ripples are exported, carrying out branch synchronization by high-frequency drive transformer T1, drive signal is transported into power MOS pipe is carried out
Driving.
UC3843 can be selected in general controllable accurate source of stable pressure U5, its biggest advantage is that extraneous component is few, periphery electricity
Road assembling is simple.
Controllable accurate source of stable pressure U5 peripheral circuit includes resistance R5, resistance R6, electric capacity C3, C2 and resistance R10, specifically connects
The mode of connecing is shown in Fig. 2.Connected after resistance R6 and electric capacity C3 series connection with electric capacity C2, be connected in parallel on controllable accurate source of stable pressure U5 sampling
End and negative terminal both sides；Controllable accurate source of stable pressure U5 positive ending grounding, the negative electrode of negative terminal connection isolation optocoupler U2 light emitting diode
(U2 2 pins), anode (U2 1 pin) the connection output voltage signal of light emitting diode, isolation optocoupler U2 light-emitting diodes
The both ends of pipe are parallel with resistance R5, and output voltage signal is connected by resistance R9 with controllable accurate source of stable pressure U5 sampling end, can
Control precision voltage regulator U5 sampling end is also connected to the ground by resistance R10；U5 sampling end is connected with output current signal connection
Operational amplifier U4B in-phase end (U4B 5 pins), backward end (U4B 6 pins) connection Vcc, output end (U4B 7 pipes
Pin) connection U5 sampling end；Emitter stage (the isolation optocoupler U2 3 pins) ground connection of isolation optocoupler U2 phototriode, isolation
Colelctor electrode (isolation optocoupler U2 4 pins) the connection pulse modulation controller U3 of optocoupler U2 phototriode comparison port
(U3 7 pins) and pulse modulation controller U3 current potential port (U3 6 pins), and be grounded by electric capacity C1.
The colelctor electrode (U2 4 pins) of isolation optocoupler U2 phototriode is also controlled by resistance R7 connections impulse modulation
Device U3 clock port (U3 5 pins), pulse modulation controller U3 clock port (U3 5 pins) are also connect by electric capacity C4
Ground.Pulse modulation controller U3 inspection flow port (U3 3 pins) passes through the sampling branch road of resistance R8 connection input currents.Pulse
The Same Name of Ends (T1 1 interface) of modulation controller U3 driving port (U3 2 pins) connection high-frequency drive transformer T1 primary sides,
The other end (T1 2 interfaces) is grounded.
The control circuit also includes the output voltage overvoltage protection mould being made up of operational amplifier U4A and isolation optocoupler U1
Block.Output voltage signal concatenation operation amplifier U4A in-phase end (U4A 3 pins), Vcc (U4A 2 pins) is reversely terminated,
The anode (U1 1 pin) of output end (U4A 1 pin) connection isolation optocoupler U2 light emitting diode, negative electrode (U1 2 pins)
Ground connection；Colelctor electrode (U1 4 pins) the connection pulse modulation controller U3 of isolation optocoupler U2 phototriode comparison port
(U3 7 pins), emitter stage (U1 3 pins) ground connection.
The control circuit also includes the input voltage overvoltage protective module being made up of resistance R1 and resistance R3.Input voltage is adopted
Sample branch road is grounded by resistance R1, the resistance R3 of series connection, and resistance R1 connects pulse modulation controller U3 with resistance R3 tie point
Over-pressed port (U3 8 pins).
The control circuit also includes starting voltage limit module.The moon that inlet highway passes through resistance R11 connection voltage-stabiliser tubes D1
Pole and triode Q1 base stage, D1 plus earths.Inlet highway also passes through resistance R2 connecting triodes Q1 colelctor electrode, repellel
Ground connection, the colelctor electrode that electric capacity C5, Q1 are parallel between Q1 colelctor electrode and repellel are also connected with pulse modulation controller U3 electricity
Source port (U3 1 pin).
The function and operation principle of the control circuit be：
Resistance R7, electric capacity C4 control the PWM frequency of output by pulse modulation controller U3, by high-frequency drive transformer
T1 amplifications arrange increase load capacity, are conveyed to power tube.
Resistance R8 samples to primary circuit, and electric current, which exceedes setting value, can close pulse modulation controller U3.
When busbar voltage is begun setting up, Q1 collector voltage is relatively low, Q1 cut-offs, pulse modulation controller U3 power supply
Voltage is inlet highway voltage；When inlet highway voltage is larger, during stable voltage more than D1, Q1 conductings, input is female
Line voltage is after resistance R2 partial pressures, the supply voltage to pulse modulation controller U3.So that pulse modulation controller U3
Supply voltage be unlikely to too big and U3 damaged.
Meanwhile whether resistance R1 and the real-time monitoring input voltages of resistance R3 are over-pressed.When occur it is over-pressed when, resistance R3 partial pressures compared with
Greatly, pulse modulation controller U3 over-pressed port samples the information, and pulse modulation controller U3 carries out internal logic control meter
Calculate and carry out respective handling.
When the overload occurs, i.e., output current raises, after a reference value of U4B 6 pins of 5 pins more than U4B, the 7 of U4B
Pin exports high level；When not overloading, i.e., when output current is in normal range (NR), U4B 7 pins export low level.
Controllable accurate source of stable pressure U5 sampling end can be according to the output situation of output voltage and U4B, when sampling terminal voltage liter
Gao Shi, controllable accurate source of stable pressure U5 absorption electric current become big, and the electric current for flowing through isolation optocoupler U2 becomes big, isolation optocoupler U2 output
Also direct proportion becomes big to the electric current at end, i.e. the electric current of the 4 pins output of U2 becomes big；When sampling end voltage reduces, controllable accurate is steady
Potential source U5 output current diminishes, and the electric current by isolation optocoupler U2 diminishes, and the electric current of isolation optocoupler U2 output end also diminishes,
That is the electric current of the 4 pins output of U2 diminishes.
When output voltage, which continues rise, reaches certain value, i.e. the benchmark of its 2 pin more than U4A of 3 pin voltages of U4A
After voltage vcc, U4A 1 pin output high level so that isolation optocoupler U1 LEDs ON, lumination of light emitting diode,
Phototriode turns on, U1 4 pins output low level, U1 4 pin output currents.When 2 pipes of the output voltage not less than U4A
During the reference voltage V cc of pin, U4A 1 pin output low level, light emitting diode is not lighted, and phototriode is not turned on, U1's
4 pins do not have electric current output.
Then, pulse modulation controller U3 comparison port (U3 7 pins) is according to the size of electric current, regulation U3 output letters
Number dutycycle, changes output voltage.When electric current change is big, output control makes the dutycycle of the Switching Power Supply of primary side diminish, this
Energy of the sample by high-frequency drive transformer T1 outputs diminishes so that the output voltage of flyback transformer Switching Power Supply drops to defeated
Go out voltage preset value；When electric current change is small, output control makes the dutycycle of the Switching Power Supply of primary side become big, is so driven by high frequency
The energy quantitative change of dynamic transformer T1 outputs is big so that the output voltage of inverse-excitation type switch power-supply rises to output voltage preset value.This
A kind of dynamic feedback regulation of sample, so as to reach the purpose of voltage stabilizing, complete to output voltage, the dynamic control of load and regulation.
The present invention can be applied to double-transistor flyback converter, and it can control two switches in the input range of non-constant width
The quick of pipe is opened, turned off, and so as to realize the conversion of energy and transmission, solves the problems, such as that single switching transistor is pressure-resistant insufficient, is improved
The accurate ability of control, whole control circuit fast response time, energy consumption are small, PCB fabric swatch small volumes.
Although present disclosure is discussed in detail by above preferred embodiment, but it should be appreciated that above-mentioned
Description is not considered as limitation of the present invention.After those skilled in the art have read the above, for the present invention's
A variety of modifications and substitutions all will be apparent.Therefore, protection scope of the present invention should be limited to the appended claims.
Claims (10)
1. a kind of inverse-excitation type switch power-supply control circuit, including the pulse for turning on and turning off with driving switch pipe for exporting PWM
Modulation controller, the output end of the comparison port connection adjustment control module of the pulse modulation controller, the adjustment control
Module includes controllable accurate source of stable pressure, and the sampling end of the controllable accurate source of stable pressure is used to connect output voltage signal, its feature
Be, in addition to overload protection module, the overload protection module includes first comparator, the first comparator it is same mutually defeated
Enter end to be used to connect output current signal, inverting input connection first reference value, output end connects the controllable accurate voltage stabilizing
The sampling end in source.
2. inverse-excitation type switch power-supply control circuit according to claim 1, it is characterised in that controllable accurate source of stable pressure is adopted
Sample end connects the primary side of the first isolation optocoupler by the first capacitance connection output voltage signal, output end, the first isolation optocoupler
Secondary connects the comparison port of the pulse modulation controller.
3. inverse-excitation type switch power-supply control circuit according to claim 1, it is characterised in that control circuit also includes output
Electric voltage over press protection module, the output voltage overvoltage protective module include the second comparator, the same phase of second comparator
Input is used to connect output voltage signal, and inverting input connects the second a reference value, and output end connects the second isolation optocoupler
Primary side, the secondary of the second isolation optocoupler connect the comparison port of the pulse modulation controller.
4. inverse-excitation type switch power-supply control circuit according to claim 1, it is characterised in that control circuit also includes input
Voltage protection module, the input voltage protection module includes the resistor voltage divider circuit of connection inlet highway voltage signal, described
The partial pressure port for dividing pulse modulation controller described in press bond of resistor voltage divider circuit.
5. inverse-excitation type switch power-supply control circuit according to claim 1, it is characterised in that control circuit also includes connection
The startup voltage limit module of the supply port of the pulse modulation controller, the startup voltage limits module include one three
Pole pipe, emitter grounding, colelctor electrode connect inlet highway voltage signal by pull-up resistor, and colelctor electrode is also connected with supply port；Institute
Partial pressure of the inlet highway voltage signal by resistance and voltage-stabiliser tube is stated, is connected to the base stage of the triode.
6. a kind of inverse-excitation type switch power-supply, including transformer, in addition to turned on and shut-off with driving switch pipe for exporting PWM
Pulse modulation controller, the output end of the comparison port connection adjustment control module of the pulse modulation controller, the regulation
Control module includes controllable accurate source of stable pressure, and the sampling end of the controllable accurate source of stable pressure is used to connect output voltage signal, its
Be characterised by, in addition to overload protection module, the overload protection module includes first comparator, the first comparator it is same
Phase input is used to connect output current signal, inverting input connection first reference value, and output end connects the controllable accurate
The sampling end of source of stable pressure.
7. inverse-excitation type switch power-supply according to claim 6, it is characterised in that the sampling end of the controllable accurate source of stable pressure
By the first capacitance connection output voltage signal, output end connects the primary side of the first isolation optocoupler, the secondary of the first isolation optocoupler
Connect the comparison port of the pulse modulation controller.
8. inverse-excitation type switch power-supply according to claim 6, it is characterised in that also including output voltage overvoltage protection mould
Block, the output voltage overvoltage protective module include the second comparator, and the in-phase input end of second comparator is used to connect
Output voltage signal, inverting input connect the second a reference value, and output end connects the primary side of the second isolation optocoupler, the second isolation light
The secondary of coupling connects the comparison port of the pulse modulation controller.
9. inverse-excitation type switch power-supply according to claim 6, it is characterised in that also including input voltage protection module, institute
Stating input voltage protection module includes the resistor voltage divider circuit of connection inlet highway voltage signal, point of the resistor voltage divider circuit
The partial pressure port of pulse modulation controller described in press bond.
10. inverse-excitation type switch power-supply according to claim 6, it is characterised in that also include connecting the impulse modulation control
The startup voltage limit module of the supply port of device processed, the startup voltage limits module include a triode, emitter grounding,
Colelctor electrode connects inlet highway voltage signal by pull-up resistor, and colelctor electrode is also connected with supply port；The inlet highway voltage
Signal passes through the partial pressure of resistance and voltage-stabiliser tube, is connected to the base stage of the triode.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710661157.2A CN107579648A (en) | 2017-08-04 | 2017-08-04 | A kind of inverse-excitation type switch power-supply and its control circuit |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710661157.2A CN107579648A (en) | 2017-08-04 | 2017-08-04 | A kind of inverse-excitation type switch power-supply and its control circuit |
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| CN108736706A (en) * | 2018-08-01 | 2018-11-02 | 杭州老板电器股份有限公司 | Controllable switch power supply and purification water tank comprising the power supply |
| CN110943734A (en) * | 2019-12-12 | 2020-03-31 | 中环天仪股份有限公司 | Isolation pulse output circuit with overload protection function and implementation method |
| CN114268216A (en) * | 2022-03-01 | 2022-04-01 | 合肥博雷电气有限公司 | Starting control system and method for auxiliary power supply of ultrahigh-voltage input type switching power supply |
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| CN110943734A (en) * | 2019-12-12 | 2020-03-31 | 中环天仪股份有限公司 | Isolation pulse output circuit with overload protection function and implementation method |
| CN114268216A (en) * | 2022-03-01 | 2022-04-01 | 合肥博雷电气有限公司 | Starting control system and method for auxiliary power supply of ultrahigh-voltage input type switching power supply |
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Application publication date: 20180112 |