CN110212761A - A kind of a variety of output mode conversion control circuits of Switching Power Supply - Google Patents
A kind of a variety of output mode conversion control circuits of Switching Power Supply Download PDFInfo
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- CN110212761A CN110212761A CN201910541900.XA CN201910541900A CN110212761A CN 110212761 A CN110212761 A CN 110212761A CN 201910541900 A CN201910541900 A CN 201910541900A CN 110212761 A CN110212761 A CN 110212761A
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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
- H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
- H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
- H02M3/10—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M3/145—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M3/155—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/156—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators
- H02M3/157—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators with digital control
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Abstract
The invention discloses a kind of a variety of output mode conversion control circuits of Switching Power Supply, which includes power supply output module, Isobarically Control loop circuit, current constant control loop circuit, MCU, control chip, alternative module, two digital regulation resistances and current sensor.Input voltage is divided by digital regulation resistance, after error amplifier compares amplification, alternative module, which is controlled, by microcontroller (MCU) selects Isobarically Control loop circuit or current constant control loop circuit, the settable required voltage value under constant voltage mode, required current value is set under constant current mode, makes power supply that there is constant pressure, constant current mode.A variety of output modes of this power supply are applicable to a variety of electricity consumption occasions, improve flexibility and convenience that power supply uses.
Description
Technical field
The invention belongs to electronic power converter fields, and in particular to a kind of control circuit of Switching Power Supply.
Background technique
Switching Power Supply constantly develops to the direction of high frequency, high reliability and multi-operation mode, can export multiple voltage,
The power supply of current value has very big application value.
The method that constant voltage source is taken at present is to detect electric power output voltage by resistance pressure-dividing network, and by itself and needs
The voltage value of output carries out operation and generates corresponding driving pulse, and by adjusting pulse width, (power supply takes arteries and veins to the driving pulse
Wide modulating mode (PWM)) or pulse frequency (power supply takes pulse frequency modulated (PFM)), realize the stabilization of output voltage.
The method that constant-current supply is taken is examined by current sensor (such as Hall current sensor, current sense resistor)
It surveys electric power outputting current, and it is subjected to the corresponding driving pulse of operation generation, the driving pulse with the current value that exports is needed
By adjusting pulse width (power supply takes PWM mode (PWM)) or pulse frequency, (power supply takes pulse frequency modulated
(PFM)) stabilization of output electric current, is realized.
Power supply, which changes output voltage or current value, following several method: the first is can be by changing primary time
The turn ratio of grade carries out, and this method is used primarily in Industrial Frequency Transformer regulating circuit, and the major defect of this method is pressure regulation electricity
Volume source and weight are all very big, at present less.Second method is used in the Switching Power Supply of high frequency transformer composition, than
Switching Power Supply such as at PWM mode (PWM) can adjust output voltage or electric current by adjusting pulse width, in pulse
Switching Power Supply under frequency adjustment modes (PFM) can adjust output voltage or electric current by adjusting pulse frequency, but both
Mode can only adjust output voltage or electric current in range by a small margin, be used primarily in the occasion of constant pressure or constant current-supplying.If
It realizes large range of pressure regulation or adjusts stream, then the reference voltage value by changing power control circuit is just needed to realize power supply
Output voltage or the adjustment for exporting electric current, in common design, the change of reference voltage is to pass through tune in power control circuit
Potentiometer resistance in whole resistance pressure-dividing network is realized, by adjusting potentiometer resistance, changes electric power output voltage or electric current arrives
The value needed, since potentiometer has mechanical wear, being used for a long time will cause the reliability of power supply and reduces, influence using.
Summary of the invention
For overcome the deficiencies in the prior art, the present invention provides a kind of a variety of output mode conversion and controls electricity of Switching Power Supply
Road can make power supply have constant pressure, constant current mode, and settable under constant voltage mode with the operating mode of expansion of power supply
Required voltage value, is arranged required current value under constant current mode, and a variety of output modes of this power supply are applicable to a variety of
Electricity consumption occasion improves flexibility and convenience that power supply uses.
In order to achieve the above objectives, the invention adopts the following technical scheme:
A kind of a variety of output mode conversion control circuits of Switching Power Supply, including power supply output module, Isobarically Control ring electricity
Road, current constant control loop circuit, MCU, control chip, alternative module, the first digital regulation resistance, the second digital regulation resistance and electric current
Sensor；
The high-end connection of the input terminal and the first digital regulation resistance of the Isobarically Control loop circuit, and the input terminal passes through
4th resistance is connect with the first output end of power supply output module, the 4th resistance and the first digital regulation resistance composition supply voltage point
Pressure network network；The output end of Isobarically Control loop circuit is connect with the first input end of alternative module；For realizing the constant pressure of power supply
Output；
The high-end connection of the first input end and the second digital regulation resistance of the current constant control loop circuit, and the input terminal
It is connect by the 6th resistance with the second reference voltage, the 6th resistance and the second digital regulation resistance form reference voltage potential-divider network；
Second input terminal of current constant control loop circuit and the output end of current sensor connect；The output end of current constant control loop circuit and two
The second input terminal of a module is selected to connect；For realizing the constant current output of power supply；
The first control terminal of the MCU is connect with the control signal of alternative module, for controlling alternative module
Output mode；Its second control terminal is connect with the sliding end of the first digital regulation resistance, for controlling the resistance of the first digital regulation resistance
Value；Third control terminal is connect with the sliding end of the second digital regulation resistance, for controlling the resistance value of the second digital regulation resistance；
The input terminal of the control chip is connect with the output end of alternative module, according to the error signal of input output two
Road pwm signal, two-way pwm signal control electric power output voltage signal or current signal；
The first input end of the current sensor is connect with the second output terminal of power supply output module, current sensor
Second input end grounding, for detecting electric power outputting current；
Preferably, the Isobarically Control loop circuit includes first error amplifier and the one II type compensator；
The non-inverting input terminal of first error amplifier is connect with the first reference voltage；The anti-phase input of first error amplifier
The high-end connection at end and the first digital regulation resistance receives the voltage sample value of source voltage network output；First error is put
The output end of big device is connect by the 33rd resistance with the first input end of alternative module；First error amplifier is used for will
Rear output error signal V is compared and enlarged in first reference voltage and the voltage sample value of source voltage network outputea1；
The series circuit and the 52nd electricity that one II type compensator is made of the 47th capacitor and the 46th resistance
Appearance is formed in parallel；The homophase input that one end of one II type compensator passes through the 45th capacitance connection to first error amplifier
End, the other end are connect with the output end of first error amplifier；
One II type compensator and first error amplifier realize the constant voltage output of power good jointly；
Preferably, the current constant control loop circuit includes the second error amplifier and the 2nd II type compensator；
The high-end connection of the non-inverting input terminal of second error amplifier and the second digital regulation resistance receives reference voltage partial pressure
The voltage sample value of network output；Its inverting input terminal is connected with the output end of current sensor, and passes through the 58th capacitor
It is connect with the non-inverting input terminal of the second error amplifier；Its output end is second defeated by the 57th resistance and alternative module
Enter end connection；The electricity for electric signal and reference voltage the potential-divider network output that second error amplifier is used to export current sensor
Rear output error signal V is compared and enlarged in pressure sampled valueea2；
The series circuit and the 61st capacitor that 2nd II type compensator is made of the 59th capacitor and the 60th resistance
It is formed in parallel；One end of 2nd II type compensator is connected to the inverting input terminal of the second error amplifier, and the other end and second miss
The output end of poor amplifier connects；
2nd II type compensator and the second error amplifier realize the constant current output of power good jointly；
Preferably, the alternative module is alternative electronic switch or relay or single-ended multi-channel switch；
Preferably, it connects between the first output end of power supply output module and the second input terminal of current sensor negative
It carries.
The beneficial effects of the present invention are: controlling dual-loop control circuit (Isobarically Control by single-chip microcontroller or microcontroller (MCU)
Ring and current constant control ring), it realizes safe and reliable power supply output state switching, extends the operating mode of power supply, have power supply
There are constant pressure, constant current mode, and the settable required voltage value under constant voltage mode, needed for being arranged under constant current mode
Current value is suitable for a variety of electricity consumption occasions, improves flexibility and convenience that power supply uses.
Detailed description of the invention
Fig. 1 is power mode conversion circuit.
Fig. 2 is using the power principle figure with a variety of output modes of the invention.
Specific embodiment
Present invention will be further explained below with reference to the attached drawings and examples.
As shown in Figure 1, can be extended the present invention provides a kind of a variety of output mode conversion control circuits of Switching Power Supply
The operating mode of power supply makes power supply have constant pressure, constant current mode, and the settable required voltage under constant voltage mode
Value, is arranged required current value, a variety of output modes of this power supply are applicable to a variety of electricity consumption occasions, mention under constant current mode
The flexibility and convenience that high power supply uses.
In order to achieve the above objectives, the invention adopts the following technical scheme:
A kind of a variety of output mode conversion control circuits of Switching Power Supply, including power supply output module, Isobarically Control ring electricity
Road, current constant control loop circuit, MCU, control chip, alternative module, the first digital regulation resistance, the second digital regulation resistance and electric current
Sensor；
The high-end connection of the input terminal and the first digital regulation resistance of the Isobarically Control loop circuit, and the input terminal passes through
4th resistance is connect with the first output end of power supply output module, the 4th resistance and the first digital regulation resistance composition supply voltage point
Pressure network network；The output end of Isobarically Control loop circuit is connect with the first input end of alternative module；For realizing the constant pressure of power supply
Output；
The high-end connection of the first input end and the second digital regulation resistance of the current constant control loop circuit, and the input terminal
It is connect by the 6th resistance with the second reference voltage, the 6th resistance and the second digital regulation resistance form reference voltage potential-divider network；
Second input terminal of current constant control loop circuit and the output end of current sensor connect；The output end of current constant control loop circuit and two
The second input terminal of a module is selected to connect；For realizing the constant current output of power supply；
The first control terminal of the MCU is connect with the control signal of alternative module, for controlling alternative module
Output mode；Its second control terminal is connect with the sliding end of the first digital regulation resistance, for controlling the resistance of the first digital regulation resistance
Value；Third control terminal is connect with the sliding end of the second digital regulation resistance, for controlling the resistance value of the second digital regulation resistance；
The input terminal of the control chip is connect with the output end of alternative module, according to the error signal of input output two
Road pwm signal, two-way pwm signal control electric power output voltage signal or current signal；
The first input end of the current sensor is connect with the second output terminal of power supply output module, current sensor
Second input end grounding, for detecting electric power outputting current；
The Isobarically Control loop circuit includes first error amplifier and the one II type compensator；
The non-inverting input terminal of first error amplifier is connect with the first reference voltage；The anti-phase input of first error amplifier
The high-end connection at end and the first digital regulation resistance receives the voltage sample value of source voltage network output；First error is put
The output end of big device is connect by the 33rd resistance with the first input end of alternative module；First error amplifier is used for will
Rear output error signal V is compared and enlarged in first reference voltage and the voltage sample value of source voltage network outputea1；
The series circuit and the 52nd electricity that one II type compensator is made of the 47th capacitor and the 46th resistance
Appearance is formed in parallel；The homophase input that one end of one II type compensator passes through the 45th capacitance connection to first error amplifier
End, the other end are connect with the output end of first error amplifier；
One II type compensator and first error amplifier realize the constant voltage output of power good jointly；
The current constant control loop circuit includes the second error amplifier and the 2nd II type compensator；
The high-end connection of the non-inverting input terminal of second error amplifier and the second digital regulation resistance receives reference voltage partial pressure
The voltage sample value of network output；Its inverting input terminal is connected with the output end of current sensor, and passes through the 58th capacitor
It is connect with the non-inverting input terminal of the second error amplifier；Its output end is second defeated by the 57th resistance and alternative module
Enter end connection；The electricity for electric signal and reference voltage the potential-divider network output that second error amplifier is used to export current sensor
Rear output error signal V is compared and enlarged in pressure sampled valueea2；
The series circuit and the 61st capacitor that 2nd II type compensator is made of the 59th capacitor and the 60th resistance
It is formed in parallel；One end of 2nd II type compensator is connected to the inverting input terminal of the second error amplifier, and the other end and second miss
The output end of poor amplifier connects；
2nd II type compensator and the second error amplifier realize the constant current output of power good jointly；
The alternative module is alternative electronic switch or relay or single-ended multi-channel switch；
The series load between the first output end of power supply output module and the second input terminal of current sensor.
Embodiment:
As shown in Fig. 2, being the Switching Power Supply schematic diagram constituted using circuit of the present invention.It is that alternating current input passes through rectification first
At direct current after filter circuit, after EMI is filtered, it is sent into power factor correction circuit, using full bridge inverter, LLC
Resonant cavity is most exported through Circuit Fault on Secondary Transformer rectifying and wave-filtering afterwards.Full-bridge inverting network is made of four switching tubes in figure；LLC is humorous
Vibration chamber is made of a capacitor and two inductance；Output voltage passes through resistance R4The partial pressure constituted with digital regulation resistance 1 (X9315)
After network partial pressure, with reference voltage Vref1Compare amplification and generates error signal Vea1, Vea1It is transported to the end in1 of CD4051 chip
(12 feet of CD4051)；Reference voltage Vref2Through resistance R6The reference voltage potential-divider network constituted with digital regulation resistance 2 (X9315)
Partial pressure, output current signal is sampled through Hall sensor U2 to be amplified compared with the sampled voltage at the both ends digital regulation resistance 2 (X9315)
Error signal V is generated afterwardsea2, Vea2It is transported to the end in2 (1 foot of CD4051) of CD4051 chip；The address of CD4051 inputs
End A, B, C (9 feet, 10 feet, 11 feet of CD4051) is controlled by MCU；Under constant voltage output mode, MCU changes digital regulation resistance 1
(X9315) resistance value adjusts voltage sample value, and voltage sample value is compared with reference voltage Vref1 and puts by Isobarically Control ring
Greatly, the end in1 (12 feet of CD4051) of output error amplified signal Vab1 to CD4051, MCU control the output end of CD4051
(3 feet of CD4051) export in1 signal to control chip U1, and control chip U1 is according to the error signal of feeding output two-way PWM
Signal, two-way pwm signal export PWM1, PWM2, PWM3 and PWM4 after isolated drive circuit and respectively drive full-bridge inverting network
In four switching tubes, electric power output voltage is controlled with this；Under constant current output mode, MCU changes digital regulation resistance 2
(X9315) resistance value adjusts reference voltage sampled value, and current constant control ring is acquired reference voltage sampled value with Hall sensor
Current signal be compared and enlarged, the in2 foot (1 foot of CD4051) of output error amplified signal Vab2 to CD4051, MCU control
Output end (3 feet of CD4051) the output in2 signal of CD4051 processed controls chip U1 according to the error of feeding to control chip U1
Signal exports two-way pwm signal, and two-way pwm signal exports PWM1, PWM2, PWM3 and PWM4 after isolated drive circuit and drives respectively
Four switching tubes in dynamic full-bridge inverting network, control electric power outputting current with this.
The rated power of the Switching Power Supply is 4KW, input voltage is alternating current 220VAC, output voltage range are as follows: 100-
200VDC, output current scope are 5-20A.According to the requirement of the output mode of power supply, when need power work in constant pressure
When output mode, address signal is sent from MCU to CD4051, makes the input signal of CD4051 output in1, is i.e. constant pressure ring error is believed
Number Vea1.Reference voltage Vref1For 2.5V, when power work is in rated output voltage, output voltage is through R4With digital regulation resistance 1
(X9315) after the potential-divider network partial pressure constituted, partial pressure value 2.5V.If desired the output voltage values for increasing power supply, can pass through MCU
Reduce the resistance value of digital regulation resistance 1, so that the partial pressure value at the both ends digital regulation resistance 1 (X9315) is less than 2.5V, leads to error signal
Vea1Increase, control chip output pwm signal duty ratio increases, and switching tube turn-on time increases, and output voltage increases；If desired
Reduce the output voltage values of power supply, the resistance value of digital regulation resistance 1 (X9315) can be increased by MCU, so that digital regulation resistance 1
(X9315) partial pressure value at both ends is greater than 2.5V, leads to error signal Vea1Reduce, control chip output pwm signal duty ratio subtracts
Small, switching tube turn-on time reduces, and output voltage reduces.Under constant voltage output mode, the output voltage adjustable range of power supply is
100-200VDC。
When needing power work in constant current output mode, address signal is sent from MCU to CD4051, exports CD4051
The input signal of in2, i.e. constant current ring error signal Vea2.Reference voltage Vref2Through R6The base constituted with digital regulation resistance 2 (X9315)
After quasi- voltage network partial pressure, (X9315) both end voltage of digital regulation resistance 2 is 2.5V, when power work is in rated output electricity
When stream, Hall sensor U2 acquisition output electric current, it is 2.5V that current signal, which is converted to voltage signal magnitude,.If desired increase electricity
The output current value in source can increase the resistance value of digital regulation resistance 2 (X9315) by MCU, so that point at 2 both ends of digital regulation resistance
Pressure value is greater than 2.5V, leads to error signal Vea2Increase, control chip output pwm signal duty ratio increases, switching tube turn-on time
Increase, output electric current increases；If desired reduce the output current value of power supply, digital regulation resistance 2 (X9315) can be reduced by MCU
Resistance value so that the partial pressure value at the both ends digital regulation resistance 2 (X9315) be less than 2.5V, lead to error signal Vea2Reduce, controls core
Piece output pwm signal duty ratio reduces, and switching tube turn-on time reduces, and output electric current reduces.Under constant current output mode, power supply
Output current regulation scope is 5-20A.
By above-mentioned switching power circuit, it can be achieved that the wide scope of output voltage and electric current accurately adjusts.It is applicable in it
In a variety of electricity consumption occasions (such as charging pile, multi-purposed charger, experiment power supply), flexibility and convenience that power supply uses are improved
Property.
Claims (5)
1. a kind of a variety of output mode conversion control circuits of Switching Power Supply, which is characterized in that including power supply output module, constant pressure
Control loop circuit, current constant control loop circuit, MCU, control chip, alternative module, the first digital regulation resistance, the second digital current potential
Device and current sensor；
The high-end connection of the input terminal and the first digital regulation resistance of the Isobarically Control loop circuit, and the input terminal passes through the 4th
Resistance is connect with the first output end of power supply output module, and the 4th resistance and the first digital regulation resistance form source voltage net
Network；The output end of Isobarically Control loop circuit is connect with the first input end of alternative module；For realizing the constant voltage output of power supply；
The high-end connection of the first input end and the second digital regulation resistance of the current constant control loop circuit, and the input terminal passes through
6th resistance is connect with the second reference voltage, and the 6th resistance and the second digital regulation resistance form reference voltage potential-divider network；Constant current
The output end of the second input terminal and current sensor that control loop circuit connects；The output end and alternative of current constant control loop circuit
Second input terminal of module connects；For realizing the constant current output of power supply；
The first control terminal of the MCU is connect with the control signal of alternative module, for controlling the output of alternative module
Mode；Its second control terminal is connect with the sliding end of the first digital regulation resistance, for controlling the resistance value of the first digital regulation resistance；The
Three control terminals are connect with the sliding end of the second digital regulation resistance, for controlling the resistance value of the second digital regulation resistance；
The input terminal of the control chip is connect with the output end of alternative module, exports two-way according to the error signal of input
Pwm signal, two-way pwm signal control electric power output voltage signal or current signal；
The first input end of the current sensor is connect with the second output terminal of power supply output module, and the second of current sensor
Input end grounding, for detecting electric power outputting current.
2. a kind of a variety of output mode conversion control circuits of Switching Power Supply as described in claim 1, which is characterized in that described
Isobarically Control loop circuit includes first error amplifier and the one II type compensator；
The non-inverting input terminal of first error amplifier is connect with the first reference voltage；The inverting input terminal of first error amplifier with
The high-end connection of first digital regulation resistance receives the voltage sample value of source voltage network output；First error amplifier
Output end connect with the first input end of alternative module by the 33rd resistance；First error amplifier is used for first
Rear output error signal V is compared and enlarged in reference voltage and the voltage sample value of source voltage network outputea1；
The series circuit and the 52nd capacitor that one II type compensator is made of the 47th capacitor and the 46th resistance are simultaneously
Join；One end of one II type compensator by the 45th capacitance connection to first error amplifier non-inverting input terminal,
The other end is connect with the output end of first error amplifier；
One II type compensator and first error amplifier realize the constant voltage output of power good jointly.
3. a kind of a variety of output mode conversion control circuits of Switching Power Supply as described in claim 1, which is characterized in that described
Current constant control loop circuit includes the second error amplifier and the 2nd II type compensator；
The high-end connection of the non-inverting input terminal of second error amplifier and the second digital regulation resistance receives reference voltage potential-divider network
The voltage sample value of output；Its inverting input terminal is connected with the output end of current sensor, and passes through the 58th capacitor and the
The non-inverting input terminal of two error amplifiers connects；Its output end passes through the second input terminal of the 57th resistance and alternative module
Connection；Second error amplifier is for adopting the voltage that the electric signal that current sensor exports is exported with reference voltage potential-divider network
Rear output error signal V is compared and enlarged in sample valueea2；
The series circuit that 2nd II type compensator is made of the 59th capacitor and the 60th resistance is in parallel with the 61st capacitor
It forms；One end of 2nd II type compensator is connected to the inverting input terminal of the second error amplifier, and the other end is put with the second error
The output end connection of big device；
2nd II type compensator and the second error amplifier realize the constant current output of power good jointly.
4. a kind of a variety of output mode conversion control circuits of Switching Power Supply as described in claim 1, which is characterized in that described
Alternative module is alternative electronic switch or relay or single-ended multi-channel switch.
5. a kind of a variety of output mode conversion control circuits of Switching Power Supply as described in claim 1, which is characterized in that in electricity
Series load between first output end of source output module and the second input terminal of current sensor.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113224948A (en) * | 2021-07-08 | 2021-08-06 | 上海芯龙半导体技术股份有限公司 | Switching power supply circuit, switching power supply chip and switching power supply system |
| CN113991990A (en) * | 2021-12-28 | 2022-01-28 | 深圳市永联科技股份有限公司 | Method and device for adjusting switching power supply |
| WO2022088403A1 (en) * | 2020-10-27 | 2022-05-05 | 合肥科威尔电源系统股份有限公司 | Low-current wide-range adjustable pulse constant current source circuit |
| CN115224940A (en) * | 2022-07-22 | 2022-10-21 | 厦门英麦科芯集成科技有限公司 | Constant-current constant-voltage output circuit and power supply chip |
| CN115955090A (en) * | 2023-03-13 | 2023-04-11 | 季华实验室 | Control circuit of magnetron high-voltage power supply |
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