CN207559856U - A kind of ON-OFF control circuit - Google Patents
A kind of ON-OFF control circuit Download PDFInfo
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- CN207559856U CN207559856U CN201721709529.6U CN201721709529U CN207559856U CN 207559856 U CN207559856 U CN 207559856U CN 201721709529 U CN201721709529 U CN 201721709529U CN 207559856 U CN207559856 U CN 207559856U
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Abstract
The utility model discloses a kind of ON-OFF control circuit, suitable for BOOST circuits, including：Input voltage detection circuit, input voltage compare and control circuit and output voltage detecting circuit；Input voltage detection circuit detects the input voltage of BOOST circuits, output-input voltage signal；Input voltage compares the size of input voltage signal and reference voltage signal compared with control circuit, and whether control output voltage detecting circuit works；Output voltage detecting circuit performs related instruction, when its work, detect the output voltage of BOOST circuits, and output voltage signal to the feedback pin of BOOST circuit PWM controllers, whether control BOOST circuits work, the utility model pre-processes wide input voltage by the method for Discrete control, and the problem of Wen Sheng is difficult to take into account is closed so as to dissolve high input voltage no-load voltage ratio.
Description
Technical field
It is more particularly to a kind of suitable for Boost circuit the utility model is related to ON-OFF control circuit and its control method
ON-OFF control circuit and its control method.
Background technology
High-voltage suppling power is a kind of switch converters, for for photovoltaic solar, wind-power electricity generation, reactive power compensator
SVG, central air-conditioning dispatch control system, heating system provide stable, reliable DC voltage.At present, more high input voltage, it is wider
The power supply requirement of input voltage range increases severely, and industry development is rapid.Such as input voltage variation is 7.5:1 200V-1500VDC
45W or input voltage no-load voltage ratio be 10:The 15W power supply market demand cumulative year after year of 1 120V-1200VDC, it is shown that good
Prospect.
For the above-mentioned market demand, engineers and technicians frequently with single-stage normal shock or flyback topologies as main circuit topology,
As input voltage no-load voltage ratio is more and more wider, using also more and more apparent the shortcomings that single-level circuit.Master power switch pipe duty ratio becomes
Changing range synchronization increases, and leads to following two problems：
1) duty is smaller under full load conditions during high input voltage, but converter general work, in discontinuous mode, main power becomes
Depressor Wen Sheng is difficult to handle；
2) when low pressure inputs, model machine is fully loaded with work, needs compared with big space rate, and it is big to be easy to cause switching tube loss, Wen Sheng compared with
It is high.
For the challenge that reply wide input voltage range is brought, two-stage type power circuit can be used, concrete thought is the first order
The high voltage raising for inputting wide scope is the relatively narrow high voltage of variation range by Boost circuit.The second level uses soft switch technique
The circuit of DC/DC both overcomes the shortcomings that resonance soft switch circuit is not suitable for wide input voltage range, while realizes switch
Pipe ZVS, and improve overall efficiency.
Boost of boosting is one of three kinds of prime power topologys, which can realize output voltage higher than input
The rectification and transformation of voltage, circuit diagram as shown in Figure 1, including inductance L1, metal-oxide-semiconductor Q1, diode D1 capacitances C1, resistance
The output voltage detecting circuit 4 of the BOOST circuits 1 and resistance R7 and resistance R8 compositions of R4 and PWM controller composition, base
This operation principle refers to the second edition that People's Telecon Publishing House publishes《It is proficient in Switching Power Supply design》Page 37, the book ISBN is
9787115367952, due to for those skilled in the art common knowledge, not being described in detail herein.
The control technology of existing Boost circuit faces larger challenge in practical application, with reference to concrete application, technology
Parameter declaration.
Certain vehicle control syetem requires 150~1000VDC of input voltage range, and output DC voltage includes 24V, 220V
It it is hundreds of watts Deng, general power.Prime control circuit main thought is：Input voltage is adjusted to using first order Boost circuit
Input voltage raising is by 600V~1000V by first order Boost circuit when input voltage is between 150V~600V
600V.When input voltage is 600V~1000V, the switching tube of BOOST circuits is normally opened, and the boosted inductance of input voltage is directly defeated
Enter to the circuit of second level soft switch technique DC/DC.
Above-mentioned control mode there are the problem of：It, can according to input, output voltage and duty cycle relationship for BOOST circuits
Directly calculate duty ratio size.When input voltage less than output voltage but is closer to defeated for 580V~600V, that is, input voltage
When going out voltage, for input voltage value closer to output voltage, duty ratio is smaller, at this time BOOST contactors pipe open, turn-off power loss
Abruptly increase at double, Wen Sheng are difficult to handle.
For above-mentioned current demand, this patent utility model people carries out in-depth analysis innovation to the control logic of circuit, this
Thus case generates.
Utility model content
Have in view of that, in order to cope with above-mentioned challenge, the utility model provides a kind of switch suitable for BOOST circuits and controls
Circuit and its control method realize that control program is simple, reliable, and actual circuit is flexible, practical.
Including BOOST main power circuits and PWM controller, BOOST inputs, output voltage detecting circuit, input voltage ratio
Compared with, control circuit, sampled signal control circuit.
The ON-OFF control circuit technical solution of the utility model is as follows：
A kind of ON-OFF control circuit suitable for including the BOOST circuits of BOOST main power circuits and PWM controller, wraps
It includes：Input voltage detection circuit, input voltage compare and control circuit and output voltage detecting circuit；
Input voltage detection circuit, for detecting the input voltage of BOOST circuits, and output-input voltage signal extremely inputs
Voltage compares and control circuit；
Input voltage compares and control circuit, for input voltage signal and reference voltage signal to be compared；When than
When relatively result is higher than the first preset value, control BOOST circuits work and input voltage are boosted to the first rated voltage；When comparing
When being as a result higher than the second preset value, control BOOST circuits work and input voltage are boosted to the second rated voltage；
Output voltage detecting circuit for detecting the output voltage of BOOST circuits, and outputs voltage signal to
The feedback pin of BOOST circuit PWM controllers, PWM controller control whether BOOST circuits work according to output voltage signal.
Preferably, input voltage compares also has N preset values with control circuit, and N is the integer more than 2；Work as input voltage
When the comparison result of signal and reference voltage signal is higher than N-1 preset values, control BOOST circuits work and by input voltage liter
It is depressed into N-1 rated voltages；When the comparison result of input voltage signal and reference voltage signal is higher than N preset values, control
BOOST circuits do not work, and input voltage signal exports after BOOST circuits.
Preferably, the first rated voltage, the second rated voltage successively increase.
A kind of specific embodiment of input voltage detection circuit is composed in series by resistance R1, resistance R2 and resistance R3,
One end after series connection for connecting input voltage vin, the other end after series connection for connect input voltage vin-.
Compare the first specific embodiment with control circuit as input voltage, by comparator U1A, reference voltage
Signal Vref, resistance R5 and NPN type triode Q3 compositions；The noninverting input connection resistance R1 and resistance R2's of comparator U1A
Series connection node, the reverse input end connection reference voltage signal Vref of comparator U1A, the output terminal of comparator U1A is through resistance R5
Connect afterwards with output voltage detecting circuit, resistance R5 also successively through the collector of triode Q3, triode Q3 emitter after with
Public earth signal connection, the series connection node of the base stage connection resistance R2 and resistance R3 of triode Q3.
Compare second of specific embodiment with control circuit as input voltage, by comparator U1A, reference voltage
Signal Vref, comparator U2A, reference voltage signal Vref2, resistance R5 and diode D2 compositions；The input in the same direction of comparator U1A
The series connection node of end connection resistance R1 and resistance R2, the reverse input end connection reference voltage signal Vref of comparator U1A, compares
The output terminal of device U1A is connect after resistance R5 as output terminal with output voltage detecting circuit, and resistance R5 is also successively through diode
It is connect after the anode of D2, the cathode of diode D2 with the output terminal of comparator U2A, the reverse input end connection electricity of comparator U2A
Hinder the series connection node of R2 and resistance R3, the noninverting input connection reference voltage signal Vref2 of comparator U2A.
As a kind of specific embodiment of output voltage detecting circuit, by resistance R6, resistance R7, resistance R8 and N ditch
Road metal-oxide-semiconductor Q2 is formed；One end exports for connecting output voltage Vo+, the other end for connecting after resistance R7 and resistance R8 series connection
The tie point of voltage Vo-, resistance R7 and resistance R8 are used to connect the feedback pin of BOOST circuit PWM controllers, resistance R7 and electricity
The tie point of resistance R8 is also connected with one end of resistance R6, the drain electrode successively through metal-oxide-semiconductor Q2 of the other end of resistance R6, metal-oxide-semiconductor Q2 source
Extremely afterwards for being connect with public earth signal, the grid connection input voltage of metal-oxide-semiconductor Q2 compares and control circuit.
The corresponding control method technical solution of ON-OFF control circuit of the utility model is as follows：
A kind of method of controlling switch suitable for including the BOOST circuits of BOOST main power circuits and PWM controller, wraps
Include following steps：
(1) input voltage of input voltage detection circuit detection BOOST circuits, and output-input voltage signal is to inputting electricity
Pressure ratio compared with control circuit；
(2) input voltage, which compares, is compared input voltage signal and reference voltage signal with control circuit, and according to
Whether comparison result control output voltage detecting circuit works；
(3) output voltage detecting circuit performs input voltage and compares instruction with control circuit, when input voltage compare with
When control circuit indicates its work, output voltage detecting circuit detects the output voltage of BOOST circuits, and exports output voltage letter
Number to BOOST circuit PWM controllers feedback pin, PWM controller according to output voltage signal control BOOST circuits whether work
Make.
Preferably, the input voltage of BOOST circuits is divided into N number of section from small to large, N is the integer more than 2；For
BOOST circuit configuration N-1 target boost values are given in N number of input voltage section, are respectively defined as the first rated voltage, the second specified electricity
Pressure, N rated voltages；When input voltage is located at first interval, input voltage is boosted to the first volume by the work of BOOST circuits
Constant voltage；When input voltage is located at second interval, input voltage is boosted to the second rated voltage by the work of BOOST circuits；When
When input voltage is located at N sections, BOOST circuits do not work.
Preferably, the first load voltage value is equal to the maximum voltage value of second interval, and the second load voltage value is located at third
Between section, N-1 load voltage values are located within N sections.
The utility model is total to be contemplated that：For the application demand of wide input voltage range, pass through the method for Discrete control
Wide input voltage is pre-processed, dissolves the problem of high input voltage no-load voltage ratio and Wen Sheng are difficult to take into account, the course of work will be
Specific embodiment part carries out detailed analysis.Compared with prior art, the utility model has following beneficial the utility model
Effect：
1) this programme solves BOOST circuits and works in pressure-increasning state, when input voltage connects less than output voltage but more
During nearly output voltage, switching tube is opened, abruptly increase, temperature rise reluctant problem to turn-off power loss at double.
2) the BOOST circuit reliabilities of high input voltage no-load voltage ratio are improved.
3) this programme circuit components number is few, simple in structure, there is cost advantage.
Description of the drawings
Fig. 1 quotes schematic diagram for background technology；
Fig. 2 is the utility model first embodiment schematic diagram；
Fig. 3 is the utility model second embodiment schematic diagram.
Specific embodiment
In order to illustrate more clearly of the technical solution of the utility model, introduced in detail below in conjunction with attached drawing, show and
Easy insight, the accompanying drawings in the following description are only the embodiment of the utility model, for those of ordinary skill in the art,
Under the premise of not making the creative labor, other attached drawings can also be obtained according to the attached drawing of offer.
First embodiment
Fig. 2 shows the functional block diagram of the utility model first embodiment ON-OFF control circuit, by the defeated of BOOST circuits
Enter that voltage is ascending to be divided into 3 sections, 3 preset values of setting are defined and illustrated for 2 rated voltages.In order to embody
It is applied, and BOOST circuits 1 is also drawn, the ON-OFF control circuit of the present embodiment includes：Input voltage detection circuit 2,
Input voltage compares and control circuit 3 and output voltage detecting circuit 4.
Input voltage detection circuit, for detecting the input voltage of BOOST circuits, and output-input voltage signal extremely inputs
Voltage compares and control circuit；
Input voltage compares and control circuit, for input voltage signal and reference voltage signal to be compared, when than
When relatively result is higher than the first preset value, control BOOST circuits work and input voltage are boosted to the first rated voltage；When comparing
When being as a result higher than the second preset value, control BOOST circuits work and input voltage are boosted to the second rated voltage；
Output voltage detecting circuit for detecting the output voltage of BOOST circuits, and outputs voltage signal to
The feedback pin of BOOST circuit PWM controllers, PWM controller control whether BOOST circuits work according to output voltage signal.
Input voltage compares also has third preset value with control circuit, when input voltage signal and the ratio of reference voltage signal
When relatively result is higher than third preset value, control BOOST circuits do not work, and input voltage signal exports after BOOST circuits；Wherein
First rated voltage, the second rated voltage successively increase.
Wherein, BOOST circuits 1 are identical with Fig. 1 of background technology, by power inductance L1, diode D1, N-channel MOS pipe
Q1, filter capacitor C1, PWM controller and driving resistance R4 are formed；The sun of input voltage vin+after inductance L1 with diode D1
Extremely it is connected, the cathode of diode D1 is connected with the anode of capacitance C1, and the cathode of capacitance C1 connects after being connected with the source electrode of metal-oxide-semiconductor Q1
To public earth signal；PWM controller (for common control IC such as UC3842, only drawing schematic diagram principle of specification herein) is internal
Error operational amplifier reverse input end FB pins be connected to output voltage detecting circuit, particularly, error operational amplifier noninverting input is
Internal reference level；
The driving output pin drv of PWM controller is connected through resistance R4 with the grid of metal-oxide-semiconductor Q1, and the drain electrode of metal-oxide-semiconductor Q1 connects
It is connected to the common node of inductance L1 and diode D1；
Particularly, input voltage vin-and BOOST outputs Vo-, public earth signal are isopotential point.
Wherein, input voltage detection circuit 2 is made of resistance R1, R2, R3, wherein one end of resistance R1 and input voltage
Vin+ is connected, and the other end is connected through resistance R2 with resistance R3, and the other end of resistance R3 connection input voltage vin-.
Wherein, input voltage compares with control circuit 3 by comparator U1A, reference voltage signal Vref, resistance R5, NPN type
Triode Q3 is formed.Wherein, reference voltage signal Vref is connected to the reverse input end of comparator U1A, and comparator U1A's is in the same direction
Input terminal is connected with the common node of resistance R1 and resistance R2, collection of the output pin through resistance R5, triode Q3 of comparator U1A
The base stage that output voltage Vo-, triode Q3 are connected to after the emitter of electrode and triode Q3 is connected to resistance R1 and resistance R2
Common node.
Wherein, output voltage detecting circuit 4 is made of resistance R6, R7, R8 and N-channel MOS pipe Q2, BOOST circuits 1 it is defeated
Go out the one end of voltage Vo+ with resistance R8 after resistance R7 to be connected, the other end of resistance R8 is connected to the output electricity of BOOST circuits 1
Press Vo-；The FB pins of the PWM controller of BOOST circuits 1 are additionally coupled to resistance R7 and resistance R8 after being connected with one end of resistance R6
Common node, the other end of resistance R6 is connected with the drain electrode of metal-oxide-semiconductor Q2, and the source level of metal-oxide-semiconductor Q2 is connected to output voltage Vo-.
The control control method of the present embodiment is as follows：
According to the input specification of customer demand, the input voltage range of BOOST circuits 1 is chosen A, B from small to large, C,
Input voltage range is divided into three operation intervals, i.e. A~B, B~C and C~D by tetra- voltage values of D, this four voltage values；
Further, BOOST circuits 1 is given to set two target boost values for input voltage range, is respectively defined as the
One rated voltage and the second rated voltage, particularly, the first load voltage value are equal to the voltage value of C, the second load voltage value position
Between C, D；
When input voltage is located at A~B sections, BOOST circuits 1 work, and input voltage is boosted to the first rated voltage；
When input voltage is located at B~C sections, BOOST circuits 1 work, and input voltage is boosted to the second rated voltage；When input electricity
When pressure is located at C~D sections, BOOST circuits 1 do not work, and metal-oxide-semiconductor Q1 is off, and input voltage is through BOOST circuits 1
It is exported after the filter circuit filtering of inductance L1 and output capacitance C1 compositions.
Its specific work process is expanded on further below in conjunction with above-mentioned physical circuit and control method：
When input voltage is located at A~B sections, the base stage of the sampled voltage less than triode Q3 at resistance R3 both ends opens electricity
Pressure, the reverse-biased cut-off of emitter of triode Q3, the collector and emitter of triode Q3 it is separated；At this point, BOOST circuits 1
Pressure-increasning state is worked in, the output voltage Vo+ after boosting is determined by output sample circuit 4, specially：
Comparator U1A compares the input voltage signal of sampling with reference voltage signal Vref, when the input electricity of sampling
When pressing signal less than reference voltage signal Vref, then comparator U1A exports low level signal, and the grid of metal-oxide-semiconductor Q2 is low level
Signal, metal-oxide-semiconductor Q2 shutdowns, the branch that the hourglass source electrode of resistance R6 and metal-oxide-semiconductor Q2 forms disconnect, the output voltage Vo of BOOST circuits 1
+ will export sampled signal after resistance R7 and resistance R8 series connection partial pressures and be transmitted to the FB feet of PWM controller, in PWM controller
The error operational amplifier reverse input end datum in portion compares, and then adjusts PWM pin duty ratio sizes, further indirect control
The output voltage amplitude of BOOST circuits 1；
Remember the error operational amplifier reverse input end internal reference level inside PWM controller for Vref1, then BOOST circuits 1
Output voltage Vboost1 can be calculated by equation below；
Particularly, the voltage value that C values represent is equal with the voltage value that Vboost1 is represented.
When input voltage is located at B~C sections, the base stage of the sampled voltage less than triode Q3 at resistance R3 both ends opens electricity
Pressure, the reverse-biased cut-off of emitter junction of triode Q3, the collector and emitter of triode Q3 it is separated；At this point, BOOST circuits 1
Pressure-increasning state is worked in, the output voltage Vo+ after boosting is determined by output sample circuit 4, specially：
Comparator U1A compares the input voltage signal of sampling with reference voltage signal Vref, when sampled voltage signal
Higher than reference voltage signal Vref, then comparator U1A exports high level signal, and the grid of metal-oxide-semiconductor Q2 is high level signal, MOS
Pipe Q2 saturation conductions, the branch of the hourglass source electrode composition of resistance R6 and metal-oxide-semiconductor Q2 are in parallel with resistance R8；
It should be noted that metal-oxide-semiconductor Q2 saturation conductions, the conducting voltage at metal-oxide-semiconductor Q2 both ends can be neglected, resistance R6 with
The branch of metal-oxide-semiconductor Q2 hourglass source electrodes composition can be equivalent to R6 and R8 and be in parallel；
The output voltage Vo+ of BOOST circuits 1 through resistance R7, resistance R6 and resistance R8 connection in series-parallel partial pressure after with PWM controller
Internal error operational amplifier reverse input end datum compares, then the output voltage Vboost2 of BOOST circuits 1 can be by such as
Lower formula calculates；
Particularly, the voltage value that Vboost2 is represented is located between the voltage value that C values and D values represent.
When input voltage is located at C~D sections, the base stage of the sampled voltage higher than triode Q3 at resistance R3 both ends opens electricity
Pressure, the equal positively biased of emitter junction and collector junction of triode Q3 are connected, the conducting voltage between the collector and emitter of triode Q3
It ignores.Comparator U1A output high level signals are output to publicly through resistance R5 is equivalent, and the grid of metal-oxide-semiconductor Q2 is low electricity
Ordinary mail number, metal-oxide-semiconductor Q2 shutdowns, the branch that the hourglass source electrode of resistance R6 and metal-oxide-semiconductor Q2 forms disconnect, the output voltage of BOOST circuits 1
The error operational amplifier that output sampled signals of the Vo+ after resistance R7 and resistance R8 series connection partial pressures is consistently higher than inside PWM controller is anti-
To input terminal datum, PWM pins output duty cycle is 0, and metal-oxide-semiconductor Q1 is held off；At this point, the not work of BOOST circuits 1
Make, output is Vo+ after the filter circuit filtering for input voltage vin+formed through inductance L1, capacitance, Vin+ phases approximate with Vo+ at this time
Deng.
Second embodiment
Fig. 3 shows the utility model second embodiment functional block diagram, compared with first embodiment shown in Fig. 2, difference
Be only that input voltage compare with control circuit 2, by the triode Q3 in first embodiment by reference voltage signal Vref2, ratio
It is second embodiment, reference voltage signal Vref2, comparator U2A and diode D2 compositions to be replaced compared with device U2A and diode D2
Circuit function with triode Q3 in circuit the effect of it is consistent.
Input voltage range will be equally divided into three operation intervals：A~B, B~C and C~D.
When input voltage is located at A~B sections, comparator U1A output low level signal, the working condition of metal-oxide-semiconductor Q2 with
Embodiment one is identical；The sampled voltage at resistance R3 both ends is less than reference voltage signal Vref2, comparator U2A output high level letters
Number, the reverse-biased cut-offs of diode D2.BOOST circuits 1 work in pressure-increasning state, working condition and one corresponding input voltage area of embodiment
Between it is identical.
When input voltage is located at B~C sections, U1A output high level signals, the working condition and embodiment of metal-oxide-semiconductor Q2
One is identical；The sampled voltage at resistance R3 both ends is less than reference voltage signal Vref2, comparator U2A output high level signals, two poles
The equally reverse-biased cut-offs of pipe D2.BOOST circuits 1 work in pressure-increasning state, working condition and one corresponding input voltage section of embodiment
It is identical.
When input voltage is located at C~D sections, comparator U1A output high level signals, the sampled voltage at resistance R3 both ends
Higher than reference voltage signal Vref2, comparator U2A output low level signals, the conducting of diode D2 positively biaseds；Comparator U1A is exported
High level signal pulls down to ground after resistance R5, diode D2, and metal-oxide-semiconductor Q2 grid source voltage is low level, at this point, BOOST is electric
Road 1 does not work, and working condition is identical with the correspondence input voltage of embodiment one section.
3rd embodiment
It unlike first embodiment and second embodiment, is adjusted in control method, by the input of BOOST circuits
Voltage range segmentation is multiple operation intervals, and A~B is as first interval, B~C as second interval and C~D as third area
Between, also N sections, N are more than or equal to 3.
Its operation principle is identical with first embodiment and second embodiment, when input voltage is located at first interval, BOOST
Circuit works, and input voltage is boosted to the first rated voltage；When input voltage is located at second interval, the work of BOOST circuits,
Input voltage is boosted into the second rated voltage；When input voltage is located at N sections, BOOST circuits do not work.
It the above is only the preferred embodiment of the utility model, it is noted that above-mentioned preferred embodiment should not regard
For the limitation to the utility model, for those skilled in the art, in the essence for not departing from the utility model
In god and range, several improvements and modifications can also be made, these improvements and modifications also should be regarded as the protection model of the utility model
It encloses, is no longer repeated here with embodiment, the scope of protection of the utility model should be subject to claim limited range.
Claims (7)
1. a kind of ON-OFF control circuit suitable for including the BOOST circuits of BOOST main power circuits and PWM controller, wraps
It includes：Input voltage detection circuit, input voltage compare and control circuit and output voltage detecting circuit；
Input voltage detection circuit, for detecting the input voltage of BOOST circuits, and output-input voltage signal is to input voltage
Compare and control circuit；
Input voltage compares and control circuit, for input voltage signal and reference voltage signal to be compared；It is tied when comparing
When fruit is higher than the first preset value, control BOOST circuits work and input voltage are boosted to the first rated voltage；Work as comparison result
During higher than the second preset value, control BOOST circuits work and input voltage are boosted to the second rated voltage；
Output voltage detecting circuit for detecting the output voltage of BOOST circuits, and outputs voltage signal to BOOST electricity
The feedback pin of road PWM controller, PWM controller control whether BOOST circuits work according to output voltage signal.
2. ON-OFF control circuit according to claim 1, it is characterised in that：The input voltage compares and control circuit
Also N preset values, N are the integer more than 2；When the comparison result of input voltage signal and reference voltage signal is higher than N-1
During preset value, control BOOST circuits work and input voltage are boosted to N-1 rated voltages；When input voltage signal and ginseng
When examining the comparison result of voltage signal higher than N preset values, control BOOST circuits do not work, and input voltage signal is through BOOST electricity
It is exported behind road.
3. ON-OFF control circuit according to claim 2, it is characterised in that：First rated voltage, described
Two rated voltages successively increase.
4. ON-OFF control circuit according to claim 1, it is characterised in that：Input voltage detection circuit is by resistance R1, electricity
Resistance R2 and resistance R3 is composed in series, and one end and the input voltage vin after wherein resistance R1 series connection+be connected, the other end is through resistance R2
It connects with resistance R3, the other end connection input voltage vin after resistance R3 series connection-.
5. ON-OFF control circuit according to claim 4, it is characterised in that：Input voltage compares with control circuit compared with
Device U1A, reference voltage signal Vref, resistance R5 and NPN type triode Q3 compositions；The noninverting input connection electricity of comparator U1A
The series connection node of R1 and resistance R2 is hindered, the reverse input end of comparator U1A connects reference voltage signal Vref, comparator U1A's
Output terminal is connect after resistance R5 as output terminal with output voltage detecting circuit, current collections of the resistance R5 also successively through triode Q3
Pole, triode Q3 emitter after connect with public earth signal, the base stage of triode Q3 connection resistance R2's and resistance R3 connects
Node.
6. ON-OFF control circuit according to claim 4, it is characterised in that：Input voltage compares with control circuit compared with
Device U1A, reference voltage signal Vref, comparator U2A, reference voltage signal Vref2, resistance R5 and diode D2 compositions；Compare
The series connection node of the noninverting input connection resistance R1 and resistance R2 of device U1A, the reverse input end connection of comparator U1A is with reference to electricity
Signal Vref is pressed, the output terminal of comparator U1A is connect after resistance R5 as output terminal with output voltage detecting circuit, resistance R5
Also successively through the anode of diode D2, diode D2 cathode after connect with the output terminal of comparator U2A, comparator U2A's is anti-
To the series connection node of input terminal connection resistance R2 and resistance R3, the noninverting input connection reference voltage signal of comparator U2A
Vref2。
7. ON-OFF control circuit according to claim 1, it is characterised in that：Output voltage detecting circuit is by resistance R6, electricity
Hinder R7, resistance R8 and N-channel MOS pipe Q2 compositions；BOOST circuit output voltages Vo+ after resistance R7 with one end phase of resistance R8
Even, the other end of resistance R8 is connected to BOOST circuit outputs Vo-；After the FB pins of PWM controller are connected with one end of resistance R6
The further common node for being connected to R7, R8, the other end of resistance R6 are connected with the drain electrode of N-channel MOS pipe Q2, N-channel MOS
The source level of pipe Q2 is connected to BOOST circuit outputs Vo-；, N-channel MOS pipe Q2 source electrode after for being connect with public earth signal, N
The grid connection input voltage of channel MOS tube Q2 compares the output terminal with control circuit.
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| CN107968565A (en) * | 2017-12-07 | 2018-04-27 | 广州金升阳科技有限公司 | A kind of ON-OFF control circuit and its control method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107968565A (en) * | 2017-12-07 | 2018-04-27 | 广州金升阳科技有限公司 | A kind of ON-OFF control circuit and its control method |
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