CN104811045B - DC switch converters - Google Patents
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- CN104811045B CN104811045B CN201510198938.3A CN201510198938A CN104811045B CN 104811045 B CN104811045 B CN 104811045B CN 201510198938 A CN201510198938 A CN 201510198938A CN 104811045 B CN104811045 B CN 104811045B
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Abstract
The present invention provides a kind of DC switch converters, and convertor controls regulation circuit can reduce corresponding second electric current of secondary circuit, to reduce the power output of secondary circuit when first voltage declines according to the change of dutycycle.Wherein, when first voltage declines; convertor controls regulation circuit can reset the maximum current of converter output loading according to change in duty cycle to reduce load current; so as to reduce converter power output; the input current of primary circuit is forced not increase in the case where input voltage declines; protect the switching tube of primary circuit not burnt out because of high current, effectively increase the service life of DC switch converters.
Description
Technical field
The present invention relates to converter technology, more particularly to a kind of DC-DC switch converter.
Background technology
Due to DC-to-dc, (Direct Current-Direct Current are referred to as：DC-DC) switch converters are being just
Often in the case of work, the voltage of bus input has normal voltage and under-voltage, when the voltage that bus is inputted is normal voltage,
DC-DC switch converters normal works, and Maximum Power Output, when the voltage that busbar voltage is inputted is under-voltage, can pass through
Under-voltage protecting circuit is protected, that is, when voltage it is low arrive certain value when, disconnect bus so that reach protection DC-DC switch become
The effect of parallel operation, when between DC-DC switching converter operations are normal voltage and are under-voltage in bus input voltage, it is necessary to limit
Power output processed, because if not limiting the power output of DC-DC switch converters, DC-DC switch converters need for defeated
Go out peak power, input current will be caused to raise, will raise device for power switching caloric value by high current for a long time, than
Such as：Metal oxide semiconductor field effect tube (Metal-Oxide-Semiconductor Field-Effect
Transistor, referred to as：) or insulated gate bipolar transistor ((Insulated Gate Bipolar MOSFET
Transistor, referred to as：IGBT) etc., so as to cause excess temperature to burn out switching device, cause DC-DC switch converters to damage.
DC-DC switch converters limit power is completed by software mostly at present, monolithic machine testing bus voltage signal, if female
The condition single-chip microcomputer of line voltage satisfaction limit power sends order and does rising limit power operation.
But the detection signal of single-chip microcomputer is easily disturbed and causes software to be judged by accident, so as to cause DC-DC switch converters to lead to
The electric current crossed is still too high electric current, ultimately results in the damage of DC-DC switch converters.
The content of the invention
The embodiment of the present invention provides a kind of DC-DC switch converter, to overcome in the prior art, monolithic machine testing
The problem of electric current passed through caused by signal is interfered in DC-DC switch converter is excessive.
First aspect present invention provides a kind of DC-DC switch converter, including：
Primary circuit, for the corresponding first voltage of electrokinetic cell to be exported to translation circuit；
The translation circuit, for the first voltage to be reduced into secondary circuit pair according to default step-down ratio and dutycycle
The second voltage answered, and the second voltage is exported to the secondary circuit, the second voltage is that the DC-to-dc is opened
Close the output voltage of converter；
The secondary circuit, for the second voltage of reception to be exported to accumulator load, so that the battery
Load charging, and by the corresponding second voltage sampled signal of the second voltage and the charging current pair of the accumulator load
The charge current sample signal output answered to convertor controls adjust circuit；
The convertor controls adjust circuit, for when the first voltage declines, according to second electricity of reception
Sampled signal and the charge current sample signal is pressed to reduce corresponding first electric current of the primary circuit, to reduce the primary side
The power output of circuit.
With reference in a first aspect, in the first possible implementation of first aspect, the convertor controls regulation is electric
Road, including：
Convertor controls chip,
The Voltage Feedback pin of the convertor controls chip is used to receive the second voltage sampled signal, and according to institute
State the dutycycle of the output pulse bandwidth technology PWM ripples of the change regulation output pin of second voltage signal.
With reference to the first possible implementation of first aspect, in second of possible implementation of first aspect
In, the convertor controls adjust circuit, in addition to：
Current sample sensor, the current sample sensor obtains the charging current for the charging current of sampling
Sampled signal, tertiary voltage is converted to by the charge current sample signal, and the tertiary voltage is defeated by operational amplifier
Go out to the current sampling pin of the convertor controls chip.
With reference to second of possible implementation of first aspect, in the third possible implementation of first aspect
In, the convertor controls regulation circuit also includes：
Discharge circuit and the first regulation circuit,
The in-phase input end of the discharge circuit is connected with supply voltage, the inverting input of the discharge circuit with it is described
The output end of current sampler and the connection of the output end of the discharge circuit, for the tertiary voltage to be carried out into negative-feedback, institute
The output end for stating discharge circuit is connected with the current sampling pin of the convertor controls chip, for by the tertiary voltage
Negative-feedback result is exported to the current sampling pin of the convertor controls chip.
The input of the first regulation circuit connects the output pin of convertor controls chip, the first regulation circuit
Output end be connected with the discharge circuit in-phase input end, the voltage of the in-phase input end for adjusting the discharge circuit.
With reference to the third possible implementation of first aspect, in the 4th kind of possible implementation of first aspect
In, the discharge circuit includes：
The output end of operational amplifier is connected with the current sampling pin of the convertor controls chip, the operation amplifier
The in-phase end of device be connected and supply voltage connection with the first regulation circuit respectively, the end of oppisite phase of the operational amplifier respectively with institute
State the output end of current sample sensor and the output end connection of the operational amplifier.
With reference to the 4th kind of possible implementation of first aspect, in the 5th kind of possible implementation of first aspect
In, the discharge circuit includes：
The in-phase end of the operational amplifier is connected with one end of first resistor and one end of second resistance respectively, and described
The other end of one resistance is connected with supply voltage, the other end ground connection of the second resistance；
The end of oppisite phase of the operational amplifier is connected with one end of 3rd resistor and one end of the 4th resistance respectively, and described
The other end of three resistance and the output end of current sensor are connected；
The output end of the operational amplifier is connected with the other end of the 4th resistance and one end of the 5th resistance respectively,
The other end of 5th resistance is connected with the current sampling pin of convertor controls chip, one end of the 6th resistance and described the
The other end connection of five resistance, the other end ground connection of the 6th resistance.
With reference to the 5th kind of possible implementation of first aspect, in the 6th kind of possible implementation of first aspect
In, the first regulation circuit includes：
The negative electrode of diode is connected with the output pin of the convertor controls chip, the anode and electric capacity of the diode
One end, one end connection of one end of the 7th resistance and the 8th resistance, the other end of the 7th resistance is connected with supply voltage,
The other end of 8th resistance is connected with one end of the first resistor and one end of the second resistance, the electric capacity it is another
One end is grounded.
With reference to the possible realization side of any of first aspect, first to the 6th kind of possible implementation of first aspect
Formula, in the 7th kind of possible implementation of first aspect, the convertor controls chip is UC3844 chips.
In the present invention, primary circuit exports the corresponding first voltage of electrokinetic cell to translation circuit, translation circuit according to
First voltage is reduced to the corresponding second voltage of secondary circuit by default step-down ratio and dutycycle, and second voltage is exported to pair
Side circuit, second voltage is the output voltage of DC-DC switch converter, and then secondary circuit is defeated by the second voltage of reception
Go out to accumulator load, so that accumulator load charges, and by the corresponding second voltage sampled signal of second voltage and electric power storage
The corresponding charge current sample signal output of charging current of pond load to convertor controls adjust circuit, last convertor controls
Adjust circuit reduces primary side when first voltage declines according to the second voltage sampled signal of reception and charge current sample signal
Corresponding first electric current of circuit, to reduce the power output of primary circuit.Wherein, when first voltage declines, convertor controls
Regulation circuit can force the input current of primary circuit to reduce according to the signal collected, so as to reduce DC-DC switch
The electric current flowed through in converter, effectively increases the service life of DC-DC switch converter.
Brief description of the drawings
In order to illustrate more clearly about the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing
There is the accompanying drawing used required in technology description to be briefly described, it should be apparent that, drawings in the following description are this hairs
Some bright embodiments, for those of ordinary skill in the art, without having to pay creative labor, can be with
Other accompanying drawings are obtained according to these accompanying drawings.
Fig. 1 show the structural representation of DC-DC switch converter provided in an embodiment of the present invention；
Fig. 2 show the schematic diagram of UC3844 chips；
The structural representation for the DC-DC switch converters that another embodiment of the present invention shown in Fig. 3 is provided；
Fig. 4 show the concrete structure schematic diagram of discharge circuit；
Fig. 5 show the concrete structure schematic diagram of the first regulation circuit；
Fig. 6 show the overall structure diagram that convertor controls adjust circuit；
Fig. 7 show the topological diagram of the DC-DC switch converters of another embodiment of the present invention offer.
Embodiment
To make the purpose, technical scheme and advantage of the embodiment of the present invention clearer, below in conjunction with the embodiment of the present invention
In accompanying drawing, the technical scheme in the embodiment of the present invention is clearly and completely described, it is clear that described embodiment is
A part of embodiment of the present invention, rather than whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art
The every other embodiment obtained under the premise of creative work is not made, belongs to the scope of protection of the invention.
Fig. 1 show the structural representation of DC-DC switch converter provided in an embodiment of the present invention, as shown in figure 1,
The DC-DC switch converter includes：
Primary circuit 101, for the corresponding first voltage of electrokinetic cell to be exported to translation circuit 102；
Translation circuit 102, for first voltage to be reduced into the correspondence of secondary circuit 103 according to default step-down ratio and dutycycle
Second voltage, and second voltage is exported to secondary circuit, second voltage is DC-to-dc (Direct Current-
Direct Current, referred to as：DC-DC) the output voltage of switch converters；
Secondary circuit 103, for the second voltage of reception to be exported to accumulator load 104, so that accumulator load 104
Charging, and by the corresponding charging of charging current of the corresponding second voltage sampled signal of second voltage and accumulator load 104
Current sampling signal exports to convertor controls and adjusts circuit 105；
Convertor controls adjust circuit 105, for the second voltage sampled signal when first voltage declines according to reception
Corresponding first electric current with charge current sample signal reduction primary circuit 101, to reduce the power output of primary circuit 101.
DC-DC switch converter provided in an embodiment of the present invention, including：Primary circuit is by electrokinetic cell corresponding
First voltage is reduced to secondary circuit pair by one voltage output to translation circuit, translation circuit according to default step-down ratio and dutycycle
The second voltage answered, and second voltage is exported to secondary circuit, second voltage is electric for the output of DC-DC switch converter
Pressure, then secondary circuit exports the second voltage of reception to accumulator load, so that accumulator load charges, and it is electric by second
Press corresponding second voltage sampled signal and the corresponding charge current sample signal output of the charging current of accumulator load extremely
Convertor controls adjust circuit, and last convertor controls regulation circuit is adopted when first voltage declines according to the second voltage of reception
Sample signal and charging current reduce corresponding first electric current of secondary circuit through oversampled signals, to reduce the output work of primary circuit
Rate.Wherein, when first voltage declines, convertor controls regulation circuit can reset DC-to-dc according to change in duty cycle
Switch converters are exported to the maximum current of accumulator load to reduce the corresponding charging current of accumulator load, so as to reduce straight
The power output of stream-DC Switching Converter, so as to force the input current of primary circuit in the case where input voltage declines
Do not increase, protect the switching tube (MOSFET, IGBT etc.) in primary circuit not burnt out because of high current, effectively increase straight
The service life of stream-DC Switching Converter.
Further, because UC3844 is a kind of high-performance Single-end output formula current control mode pulse width modulator chip, by
The switching power supply that the integrated circuit is constituted has outer compared with general voltage-controlled type Pulsewidth modulating swith power stabilizer
Enclose that circuit is simple, voltage regulation factor is good, good frequency response, stable amplitude are big, with excessively stream limitation, overvoltage protection and under-voltage locking
The advantages of.Therefore, the function of the first electric current is reduced in order to realize that convertor controls adjust circuit 105, it is preferred that convertor controls
The convertor controls chip selection UC3844 chips in circuit 105 are adjusted, Fig. 2 show the schematic diagram of UC3844 chips.
UC3844 1 pin is compensation pins COMP, and the pin exports for error amplifier, and available for loop compensation.
UC3844 2 pins are Voltage Feedback pin Vfb, and the pin is the inverting input of error amplifier, generally logical
Cross a resitstance voltage divider and be connected to Switching Power Supply output.
UC3844 3 pins are current sampling pin Isense, and it is defeated that the voltage for being proportional to inductor current is connected to this
Enter, pulse width modulator stops the conducting of output switch using this information.
UC3844 4 pins are RT/CTPin, by by resistance RTIt is connected to the reference output Vref of UC3844 8 pins
And electric capacity CTIt is connected to the ground, makes oscillator frequency and maximum output dutycycle adjustable.Working frequency is up to 1MHZ.
UC3844 5 pins are ground pin GND, and the pin is to control circuit and power supply publicly.
UC3844 6 pins are output pin OUT, up to output direct drive power MOSFET grid, 1A peak
It is worth electric current to draw and fill through this pin, output switch frequency is the half of oscillator frequency.
UC3844 7 pins are supply voltage pin Vcc, and the pin is the positive supply for controlling integrated circuit.
UC3844 8 pins are to refer to output pin Vref, and it passes through resistance RTTo electric capacity CTCharging current is provided.
Further, the structural representation for the DC-DC switch converters that another embodiment of the present invention shown in Fig. 3 is provided, such as
Shown in Fig. 3, for above-mentioned DC-DC switch converters, the Voltage Feedback pin of UC3844 chips is adopted for receiving second voltage
Sample signal, and according to the output pulse width modulation technique (Pulse of the small signal variation of second voltage regulation output pin
Width Modulation, referred to as：PWM) the dutycycle of ripple.
Further, convertor controls regulation circuit 105 also includes：Current sample sensor, current sample sensor is used
Charge current sample signal is obtained in sampling charging current, charge current sample signal is converted into tertiary voltage, by the 3rd electricity
Pressure is exported to the current sampling pin of UC3844 chips by operational amplifier.
Further, as shown in figure 3, convertor controls regulation circuit also includes：
Discharge circuit and the first regulation circuit,
The in-phase input end of discharge circuit is connected with supply voltage, the inverting input of discharge circuit and current sampler
Output end and the connection of the output end of discharge circuit, for tertiary voltage to be carried out into negative-feedback, the output end of discharge circuit with
The current sampling pin connection of UC3844 chips, for the negative-feedback result of tertiary voltage to be exported to the electric current of UC3844 chips
Sample pin.
The input of first regulation circuit connects the output pin of UC3844 chips, the output end and fortune of the first regulation circuit
The road in-phase input end that discharges is connected, the voltage of the in-phase input end for adjusting discharge circuit.
Further, discharge circuit includes：The output end of operational amplifier connects with the current sampling pin of UC3844 chips
Connect, the in-phase end of operational amplifier is connected respectively with the first regulation circuit and supply voltage is connected, the end of oppisite phase of operational amplifier
It is connected respectively with the output end of current sample sensor and the output end of operational amplifier.
Specifically, Fig. 4 show the concrete structure schematic diagram of discharge circuit, as shown in figure 4, discharge circuit includes：
First resistor R1, second resistance R2,3rd resistor R3, the 4th resistance R4, the 5th resistance R5, the 6th resistance R6, fortune
The operational amplifier calculated in amplifier, the present embodiment uses LM358,
Specifically annexation is：Operational amplifier LM358 in-phase end respectively with first resistor R1 one end and second
Resistance R2 one end connection, the first resistor R1 other end is connected with supply voltage VCC, second resistance R2 other end ground connection
GND；
Operational amplifier LM358 end of oppisite phase is connected with 3rd resistor R3 one end and the 4th resistance R4 one end respectively
Connect, the output end Vi connections of 3rd resistor the R3 other end and current sensor；
Operational amplifier LM358 output end connects with the 4th resistance R4 other end and the 5th resistance R5 one end respectively
Connect, the 5th resistance R5 other end is connected with the current sampling pin of UC3844 chips, the 6th resistance R6 one end and the 5th electricity
The other end connection of resistance, the 6th resistance R6 other end ground connection GND.
Specifically, Fig. 5 show the concrete structure schematic diagram of the first regulation circuit, as shown in figure 5, the first regulation circuit bag
Include：
Diode D1, the 7th resistance R7, the 8th resistance R8, electric capacity C1,
Specifically annexation is：Diode D1 negative electrode is connected with the output pin of UC3844 chips, diode D1's
Anode is connected with electric capacity C1 one end, the 7th resistance R7 one end and the 8th resistance R8 one end, the 7th resistance R7 other end
It is connected with supply voltage VCC, the 8th resistance R8 other end is connected with one end of first resistor R1 one end and second resistance R2,
Electric capacity C1 other end ground connection GND.
Wherein, C1 requirements are the good thin-film capacitors of high frequency characteristics, and D1 requires fast recovery diode.
Further, Fig. 6 show the overall structure diagram that convertor controls adjust circuit, as shown in fig. 6,
Assuming that the DC-DC switch converters that the present invention is provided, bus input voltage range 200V-400V, normal work electricity
Press as 320V, it is under-voltage less than 200V buses.When inlet highway voltage is between 200V-320V, convertor controls regulation circuit
The output current of primary circuit can be adjusted, so as to limit the power output of DC-DC switch converters.
Assuming that DC-DC switch converters are the pass of forward converter, the then input voltage of forward converter and output voltage
It is that formula is：
Vout=Vin×N×D
Wherein, VinFor bus input voltage, VoutFor output voltage, N is transformer voltage ratio, and D is PWM duty cycle.
In the present embodiment, when the input of normal work bus is 320V, electric current when current sampling pin voltage is 1V is to open
Close the peak point current of converter.It can be seen from above-mentioned formula, as inlet highway input voltage 200V-320V, namely VinReduce,
To keep output voltage VoutIt is constant, dutycycle will be caused to become big.
DC-DC switch converters are controlled using TI companies power management chip UC3844, DC-DC switch converters are used
Peak point current algorithm is controlled.UC3844 current sample pin is the output peak point current for limiting converter, and output pin is defeated
It is T square-wave signals to go out the adjustable PWM cycle of dutycycle that certain frequency amplitude is VCC (frequency size is configured by 4 pin).UC3844
Chip service manual shows the voltage signal of current sample pin more than 1V, and output voltage pin can seal ripple, current sample pin
Electric current of voltage when being IV be DC-DC switch converters peak point current.
Wherein, VCCFor 12V, ViFor current sensor voltage signal and Vi with UC3844 chips output current increase and
It is linear to reduce.A points voltage is Va in Fig. 6, and B points voltage is Vref.When UC3844 is output as high level, (amplitude is Vcc, and the time is
When D*T), the reverse-biased cut-offs of diode D1.
A point voltages Va is：
Wherein, VaFor a point voltages, VccFor supply voltage, R7For resistance R7 resistance, D is PWM duty cycle, and T adjusts for PWM
Complete cycle.
Continue according to the example above, when dutycycle becomes big, namely in a switch periods, output pin output square wave is accounted for
Sky is than rising, and diode D1 deadlines raise in Fig. 6, and A point voltages Va rises as shown from the above formula.
B point voltages V+For：
Wherein, V+For B point voltages, VccFor supply voltage, R1For resistance R1 resistance, R2For resistance R2 resistance, R7For electricity
Hinder R7 resistance, R8For resistance R8 resistance, VaFor a point voltages.
Continue according to the example above, when A point voltages Va rises, according to above formula, B point voltages V+Rise.
UC3844 current sampling pin voltage V3For：
Wherein, V3For UC3844 current sampling pin voltage, R3For resistance R3 resistance, R4For resistance R4 resistance, R5
For resistance R5 resistance, R6For resistance R6 resistance, Vi is that the accumulator load charging current that current sampler is sampled is corresponding
Voltage, V+For B point voltages.
Continue according to the example above, to keep output pin not by envelope ripple, that is, the voltage of current sample pin must be kept
V3Linearly increase with the reduction of the output current of output pin less than or equal to 1V, Vi, therefore B point voltages V+During rising, only Vi
Rising just can guarantee that V3Less than or equal to 1V, so relative to having reset load output maximum current, namely output current is reduced.
The power of converter output will be reduced, because the electric current in MOSFET or IGBT does not increase, so as to serve protection MOSFET
Or IGBT effect.Thus avoid and asked in the prior art by the way that MOSFET or IGBT electric current is excessive from hardware circuit
Topic.
Further, Fig. 7 show the topological diagram of the DC-DC switch converters of another embodiment of the present invention offer, such as Fig. 7
It is shown, the present embodiment provide for two-transistor forward converter circuit topology figure,
Wherein, the main circuit of two-transistor forward converter is identical with two-transistor forward converter of the prior art, wherein, Uf is
Input to the corresponding voltage sampling signal of output voltage of the pin of variator control chip 2, it is notable that in outputting inductance
The corresponding charge current sample signal of accumulator load can be exported before L, and (electric current is adjusted by this signal output to current regulating circuit
Economize on electricity road includes current sample sensor, discharge circuit and the first regulation circuit in above-described embodiment), adjust electricity through overcurrent
Road is exported after handling the charge current sample signal to variator control chip, can also be by the corresponding electricity of output voltage
Pressure sampled signal is exported to variator control chip, and variator control chip adjusts dutycycle according to receiving voltage sampled signal,
Maximum output current is adjusted according to dutycycle, exported due to resetting two-transistor forward converter according to dutycycle to storage battery negative
The maximum current of load, so that the corresponding charging current of accumulator load is reduced, so as to reduce the output work of two-transistor forward converter
Rate, and then force the input current of two-transistor forward converter not increase in the case where input voltage is reduced, protect it is two-tube just
VT1 and VT2 in exciting converter are not burnt out because of high current.
Finally it should be noted that：Various embodiments above is merely illustrative of the technical solution of the present invention, rather than its limitations；To the greatest extent
The present invention is described in detail with reference to foregoing embodiments for pipe, it will be understood by those within the art that：Its according to
The technical scheme described in foregoing embodiments can so be modified, or which part or all technical characteristic are entered
Row equivalent substitution；And these modifications or replacement, the essence of appropriate technical solution is departed from various embodiments of the present invention technology
The scope of scheme.
Claims (5)
1. a kind of DC-DC switch converter, it is characterised in that including：
Primary circuit, for the corresponding first voltage of electrokinetic cell to be exported to translation circuit；
The translation circuit, it is corresponding for the first voltage to be reduced into secondary circuit according to default step-down ratio and dutycycle
Second voltage, and the second voltage is exported to the secondary circuit, the second voltage becomes for the DC-DC switch
The output voltage of parallel operation；
The secondary circuit, for the second voltage of reception to be exported to accumulator load, so that the accumulator load
Charging, and the charging current of the corresponding second voltage sampled signal of the second voltage and the accumulator load is corresponding
Charge current sample signal output to convertor controls adjust circuit；
The convertor controls adjust circuit, for when the first voltage declines, being adopted according to the second voltage of reception
Sample signal and the charge current sample signal reduce corresponding first electric current of the primary circuit, to reduce the primary circuit
Power output；
The convertor controls adjust circuit, including：
Convertor controls chip,
The Voltage Feedback pin of the convertor controls chip is used to receive the second voltage sampled signal, and according to described the
The dutycycle of the output pulse bandwidth technology PWM ripples of the change regulation output pin of two voltage sampling signals；
The convertor controls adjust circuit, in addition to：
Current sample sensor, the current sample sensor obtains the charge current sample for the charging current of sampling
Signal, tertiary voltage is converted to by the charge current sample signal, by the tertiary voltage by operational amplifier export to
The current sampling pin of the convertor controls chip；
The convertor controls regulation circuit also includes：
Discharge circuit and the first regulation circuit,
The in-phase input end of the discharge circuit is connected with supply voltage, the inverting input of the discharge circuit and the electric current
The output end of sampling sensor and the connection of the output end of the discharge circuit, for the tertiary voltage to be carried out into negative-feedback, institute
The output end for stating discharge circuit is connected with the current sampling pin of the convertor controls chip, for by the tertiary voltage
Negative-feedback result is exported to the current sampling pin of the convertor controls chip；
The input of the first regulation circuit connects the output pin of convertor controls chip, and described first adjusts the defeated of circuit
Go out end to be connected with the discharge circuit in-phase input end, the voltage of the in-phase input end for adjusting the discharge circuit.
2. converter according to claim 1, it is characterised in that the discharge circuit includes：
The output end of operational amplifier is connected with the current sampling pin of the convertor controls chip, the operational amplifier
In-phase end be connected and supply voltage connection with the first regulation circuit respectively, the end of oppisite phase of the operational amplifier respectively with the electricity
Flow the output end of sampling sensor and the output end connection of the operational amplifier.
3. converter according to claim 2, it is characterised in that the discharge circuit includes：
The in-phase end of the operational amplifier is connected with one end of first resistor and one end of second resistance respectively, first electricity
The other end of resistance is connected with supply voltage, the other end ground connection of the second resistance；
The end of oppisite phase of the operational amplifier is connected with one end of 3rd resistor and one end of the 4th resistance respectively, the 3rd electricity
The other end of resistance is connected with the output end of current sample sensor；
The output end of the operational amplifier is connected with the other end of the 4th resistance and one end of the 5th resistance respectively, described
The other end of 5th resistance is connected with the current sampling pin of convertor controls chip, one end of the 6th resistance and the described 5th electricity
The other end connection of resistance, the other end ground connection of the 6th resistance.
4. converter according to claim 3, it is characterised in that the first regulation circuit includes：
The negative electrode of diode is connected with the output pin of the convertor controls chip, the anode of the diode and the one of electric capacity
One end connection at end, one end of the 7th resistance and the 8th resistance, the other end of the 7th resistance is connected with supply voltage, described
The other end of 8th resistance is connected with one end of one end of the first resistor and the second resistance, the other end of the electric capacity
Ground connection.
5. the converter according to claim any one of 1-4, it is characterised in that the convertor controls chip is UC3844
Chip.
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| US9964599B2 (en) * | 2016-06-20 | 2018-05-08 | Lg Chem, Ltd. | Diagnostic system for a DC-DC voltage converter |
| CN106571743B (en) * | 2016-09-13 | 2023-07-28 | 南昌大学 | Double-tube forward switch power supply circuit |
| CN107046276B (en) * | 2017-03-03 | 2019-03-15 | Oppo广东移动通信有限公司 | Supply voltage switch protects circuit and voltage conversion apparatus |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102386778A (en) * | 2010-09-03 | 2012-03-21 | 株式会社村田制作所 | Dc-dc converter |
| CN102891605A (en) * | 2011-07-20 | 2013-01-23 | 三垦电气株式会社 | Switching power supply apparatus |
| CN103151910A (en) * | 2013-03-25 | 2013-06-12 | 矽力杰半导体技术(杭州)有限公司 | Undervoltage protection circuit, under-voltage protection method and switching power supply |
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| CN104811045A (en) | 2015-07-29 |
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