CN104811045A - Direct current-direct current switching converter - Google Patents
Direct current-direct current switching converter Download PDFInfo
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- CN104811045A CN104811045A CN201510198938.3A CN201510198938A CN104811045A CN 104811045 A CN104811045 A CN 104811045A CN 201510198938 A CN201510198938 A CN 201510198938A CN 104811045 A CN104811045 A CN 104811045A
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Abstract
The invention provides a direct current-direct current switching converter. When the first voltage drops, a converter control adjusting circuit can reduce the second current corresponding to a secondary side circuit according to changes of the duty ratio so that the output power of the secondary side circuit can be reduced. When the first voltage drops, the maximum current of a converter output load can be reset by the converter control adjusting circuit according to the changes of the duty ratio so as to reduce the load current, and therefore the output power of the converter is reduced, the input current of a primary side circuit is forced to be not increased under the condition that the input voltage drops, a switching tube of the primary side circuit is protected and cannot be burnt out due to the high current, and the service life of the direct current-direct current switching converter is effectively prolonged.
Description
Technical field
The present invention relates to converter technology, particularly relate to a kind of DC-DC switch converter.
Background technology
Due to DC-to-DC (Direct Current-Direct Current, referred to as: when DC-DC) switch converters normally works, the voltage of bus input has normal voltage and under-voltage, when the voltage of bus input is normal voltage, DC-DC switch converters normally works, and Maximum Power Output, when the voltage of busbar voltage input is under-voltage, can be protected by under-voltage protecting circuit, also be, when voltage low to certain value time, disconnect bus, thus reach the effect of protection DC-DC switch converters, when DC-DC switching converter operation bus input voltage be normal voltage and under-voltage between time, just need to limit power output, because if do not limit the power output of DC-DC switch converters, DC-DC switch converters still needs Maximum Power Output, input current will be caused to raise, long-time logical excessive current will make device for power switching caloric value raise, such as: metal oxide semiconductor field effect tube (Metal-Oxide-Semiconductor Field-Effect Transistor, referred to as: MOSFET) or insulated gate bipolar transistor ((Insulated Gate Bipolar Transistor, referred to as: IGBT) etc., thus cause excess temperature to burn out switching device, DC-DC switch converters is caused to damage.
At present mostly DC-DC switch converters limit power is completed by software, microprocessor detect bus voltage signal, if the condition single-chip microcomputer that busbar voltage meets limit power is given an order do rising limit power operation.
But the detection signal of single-chip microcomputer is easily disturbed and causes software to be judged by accident, thus the electric current causing DC-DC switch converters to pass through is still too high electric current, finally causes DC-DC switch converters to damage.
Summary of the invention
The embodiment of the present invention provides a kind of DC-DC switch converter, to overcome in prior art, and the problem that the electric current passed through in the DC-DC switch converter that the signal of microprocessor detect is interfered and causes is excessive.
First aspect present invention provides a kind of DC-DC switch converter, comprising:
Former limit circuit, for exporting the first corresponding for electrokinetic cell voltage to translation circuit;
Described translation circuit, for described first voltage drop being low to moderate the second voltage corresponding to secondary circuit according to default step-down ratio and duty ratio, and exporting described second voltage to described secondary circuit, described second voltage is the output voltage of described DC-DC switch converter;
Described secondary circuit, for exporting described second voltage received to accumulator load, to make described accumulator load charge, and export charge current sample signal corresponding for the charging current of the second corresponding for described second voltage voltage sampling signal and described accumulator load to convertor controls regulating circuit;
Described convertor controls regulating circuit, for when described first voltage drop, the first electric current corresponding to described former limit circuit is reduced, to reduce the power output of described former limit circuit according to described second voltage sampling signal received and described charge current sample signal.
In conjunction with first aspect, in the first possible implementation of first aspect, described convertor controls regulating circuit, comprising:
Convertor controls chip,
The Voltage Feedback pin of described convertor controls chip is for receiving described second voltage sampling signal, and the duty ratio of output pulse bandwidth technology PWM ripple according to the change regulation output pin of described second voltage signal.
In conjunction with the first possible implementation of first aspect, in the implementation that the second of first aspect is possible, described convertor controls regulating circuit, also comprises:
Current sample transducer, described current sample transducer obtains described charge current sample signal for described charging current of sampling, described charge current sample signal is converted to tertiary voltage, described tertiary voltage is exported to the current sampling pin of described convertor controls chip by operational amplifier.
In conjunction with the implementation that the second of first aspect is possible, in the third possible implementation of first aspect, described convertor controls regulating circuit also comprises:
Discharge circuit and the first regulating circuit,
The in-phase input end of described discharge circuit is connected with supply voltage, the inverting input of described discharge circuit is connected with the output of the output of described current sampler and described discharge circuit, for described tertiary voltage is carried out negative feedback, the output of described discharge circuit is connected with the current sampling pin of described convertor controls chip, for the negative feedback result of described tertiary voltage being exported to the current sampling pin of described convertor controls chip.
The input of described first regulating circuit connects the output pin of convertor controls chip, and the output of described first regulating circuit is connected with described discharge circuit in-phase input end, for regulating the voltage of the in-phase input end of described discharge circuit.
In conjunction with the third possible implementation of first aspect, in the 4th kind of possible implementation of first aspect, described discharge circuit comprises:
The output of operational amplifier is connected with the current sampling pin of described convertor controls chip, the in-phase end of described operational amplifier is connected with the first regulating circuit respectively and supply voltage connects, and the end of oppisite phase of described operational amplifier is connected with the output of described current sample transducer and the output of described operational amplifier respectively.
In conjunction with the 4th kind of possible implementation of first aspect, in the 5th kind of possible implementation of first aspect, described discharge circuit comprises:
The in-phase end of described operational amplifier is connected with one end of the first resistance and one end of the second resistance respectively, and the other end of described first resistance is connected with supply voltage, the other end ground connection of described second resistance;
The end of oppisite phase of described operational amplifier is connected with one end of the 3rd resistance and one end of the 4th resistance respectively, and the other end of described 3rd resistance is connected with the output of current sensor;
The output of described operational amplifier is connected with the other end of described 4th resistance and one end of the 5th resistance respectively, the described other end of the 5th resistance is connected with the current sampling pin of convertor controls chip, one end of 6th resistance is connected with the other end of described 5th resistance, the other end ground connection of described 6th resistance.
In conjunction with the 5th kind of possible implementation of first aspect, in the 6th kind of possible implementation of first aspect, described first regulating circuit comprises:
The negative electrode of diode is connected with the output pin of described convertor controls chip, the anode of described diode is connected with one end of one end of electric capacity, the 7th resistance and one end of the 8th resistance, the other end of described 7th resistance is connected with supply voltage, the other end of described 8th resistance is connected with one end of one end of described first resistance and described second resistance, the other end ground connection of described electric capacity.
In conjunction with any one the possible implementation in first to the 6th kind of possibility implementation of first aspect, first aspect, in the 7th kind of possible implementation of first aspect, described convertor controls chip is UC3844 chip.
In the present invention, former limit circuit exports the first corresponding for electrokinetic cell voltage to translation circuit, first voltage drop is low to moderate the second voltage corresponding to secondary circuit according to default step-down ratio and duty ratio by translation circuit, and export the second voltage to secondary circuit, second voltage is the output voltage of DC-DC switch converter, then secondary circuit exports the second voltage received to accumulator load, charge to make accumulator load, and export charge current sample signal corresponding for the charging current of the second corresponding for the second voltage voltage sampling signal and accumulator load to convertor controls regulating circuit, last convertor controls regulating circuit reduces the first electric current corresponding to former limit circuit when the first voltage drop according to the second voltage sampling signal received and charge current sample signal, to reduce the power output of former limit circuit.Wherein, when the first voltage drop, convertor controls regulating circuit can force the input current of former limit circuit to reduce according to the signal collected, thus reduces the electric current flowed through in DC-DC switch converter, effectively improves the useful life of DC-DC switch converter.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, accompanying drawing in the following describes is some embodiments of the present invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
Figure 1 shows that the structural representation of the DC-DC switch converter that the embodiment of the present invention provides;
Figure 2 shows that the schematic diagram of UC3844 chip;
The structural representation of the DC-DC switch converters that another embodiment of the present invention shown in Fig. 3 provides;
Figure 4 shows that the concrete structure schematic diagram of discharge circuit;
Figure 5 shows that the concrete structure schematic diagram of the first regulating circuit;
Figure 6 shows that the overall structure schematic diagram of convertor controls regulating circuit;
Figure 7 shows that the topological diagram of the DC-DC switch converters that another embodiment of the present invention provides.
Embodiment
For making the object of the embodiment of the present invention, technical scheme and advantage clearly, below in conjunction with the accompanying drawing in the embodiment of the present invention, technical scheme in the embodiment of the present invention is clearly and completely described, obviously, described embodiment is the present invention's part embodiment, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, belong to the scope of protection of the invention.
Figure 1 shows that the structural representation of the DC-DC switch converter that the embodiment of the present invention provides, as shown in Figure 1, this DC-DC switch converter comprises:
Former limit circuit 101, for exporting the first corresponding for electrokinetic cell voltage to translation circuit 102;
Translation circuit 102, for according to the second voltage presetting step-down ratio and duty ratio and the first voltage drop to be low to moderate secondary circuit 103 correspondence, and export the second voltage to secondary circuit, second voltage is that (Direct Current-Direct Current, referred to as the DC-DC) output voltage of switch converters for DC-to-DC;
Secondary circuit 103, for exporting the second voltage received to accumulator load 104, to make accumulator load 104 charge, and export charge current sample signal corresponding for the charging current of the second corresponding for the second voltage voltage sampling signal and accumulator load 104 to convertor controls regulating circuit 105;
Convertor controls regulating circuit 105, for reducing the first electric current of former limit circuit 101 correspondence when the first voltage drop according to the second voltage sampling signal received and charge current sample signal, to reduce the power output of former limit circuit 101.
The DC-DC switch converter that the embodiment of the present invention provides, comprise: former limit circuit exports the first corresponding for electrokinetic cell voltage to translation circuit, first voltage drop is low to moderate the second voltage corresponding to secondary circuit according to default step-down ratio and duty ratio by translation circuit, and export the second voltage to secondary circuit, second voltage is the output voltage of DC-DC switch converter, then secondary circuit exports the second voltage received to accumulator load, charge to make accumulator load, and export charge current sample signal corresponding for the charging current of the second corresponding for the second voltage voltage sampling signal and accumulator load to convertor controls regulating circuit, last convertor controls regulating circuit reduces by first electric current corresponding to secondary circuit according to the second voltage sampling signal received and charging current through oversampled signals when the first voltage drop, to reduce the power output of former limit circuit.Wherein, when the first voltage drop; convertor controls regulating circuit can reset DC-DC switch converter according to change in duty cycle and export the maximum current of accumulator load to reduce charging current corresponding to accumulator load; thus reduce the power output of DC-DC switch converter; thus force the input current of former limit circuit not increase when input voltage declines; protect the switching tube (MOSFET in the circuit of former limit; IGBT etc.) do not burn out because of big current, effectively improve the useful life of DC-DC switch converter.
Further; because UC3844 is a kind of high-performance Single-end output formula current control mode pulse width modulator chip, the advantages such as the switching power supply be made up of this integrated circuit has compared with general voltage-controlled type Pulsewidth modulating swith power stabilizer that peripheral circuit is simple, voltage regulation good, good frequency response, amplitude of stablizing are large, have that overcurrent limits, overvoltage protection and under-voltage locking.Therefore, reduce the function of the first electric current to realize convertor controls regulating circuit 105, preferably, the convertor controls chip selection UC3844 chip in convertor controls regulating circuit 105, Figure 2 shows that the schematic diagram of UC3844 chip.
1 pin of UC3844 is compensation pins COMP, and this pin is that error amplifier exports, and can be used for loop compensation.
2 pins of UC3844 are Voltage Feedback pin Vfb, and this pin is the inverting input of error amplifier, are usually connected to Switching Power Supply by a resitstance voltage divider and export.
3 pins of UC3844 are current sampling pin Isense, and the voltage being proportional to inductor current is connected to this input, and pulse width modulator uses this information to stop the conducting of output switch.
4 pins of UC3844 are R
t/ C
tpin, by by resistance R
tthe reference being connected to 8 pins of UC3844 exports Vref and electric capacity C
tbe connected to ground, make oscillator frequency and maximum output duty cycle adjustable.Operating frequency can reach 1MHZ.
5 pins of UC3844 are ground pin GND, this pin be control circuit and power supply publicly.
6 pins of UC3844 are output pin OUT, the grid of this output Direct driver power MOSFET, and drawing through this pin up to the peak current of 1A and fill with, output switch frequency is the half of oscillator frequency.
7 pins of UC3844 are supply voltage pin Vcc, and this pin is the positive supply of control integration circuit.
8 pins of UC3844 are with reference to output pin Vref, and it is by resistance R
tto electric capacity C
tcharging current is provided.
Further, the structural representation of the DC-DC switch converters that another embodiment of the present invention shown in Fig. 3 provides, as shown in Figure 3, for above-mentioned DC-DC switch converters, the Voltage Feedback pin of UC3844 chip is for receiving the second voltage sampling signal, and the output pulse width modulation technique of small signal variation regulation output pin according to the second voltage (Pulse Width Modulation, referred to as: the PWM) duty ratio of ripple.
Further, convertor controls regulating circuit 105 also comprises: current sample transducer, current sample transducer obtains charge current sample signal for charging current of sampling, charge current sample signal is converted to tertiary voltage, tertiary voltage is exported to the current sampling pin of UC3844 chip by operational amplifier.
Further, as shown in Figure 3, convertor controls regulating circuit also comprises:
Discharge circuit and the first regulating circuit,
The in-phase input end of discharge circuit is connected with supply voltage, the inverting input of discharge circuit is connected with the output of the output of current sampler and discharge circuit, for tertiary voltage is carried out negative feedback, the output of discharge circuit is connected with the current sampling pin of UC3844 chip, for the negative feedback result of tertiary voltage being exported to the current sampling pin of UC3844 chip.
The input of the first regulating circuit connects the output pin of UC3844 chip, and the output of the first regulating circuit is connected with discharge circuit in-phase input end, for regulating the voltage of the in-phase input end of discharge circuit.
Further, discharge circuit comprises: the output of operational amplifier is connected with the current sampling pin of UC3844 chip, the in-phase end of operational amplifier is connected with the first regulating circuit respectively and supply voltage connects, and the end of oppisite phase of operational amplifier is connected with the output of current sample transducer and the output of operational amplifier respectively.
Concrete, Figure 4 shows that the concrete structure schematic diagram of discharge circuit, as shown in Figure 4, discharge circuit comprises:
First resistance R1, the second resistance R2, the 3rd resistance R3, the 4th resistance R4, the 5th resistance R5, the 6th resistance R6, operational amplifier, the operational amplifier in the present embodiment adopts LM358,
Concrete annexation is: the in-phase end of operational amplifier LM358 is connected with one end of the first resistance R1 and one end of the second resistance R2 respectively, and the other end of the first resistance R1 is connected with supply voltage VCC, the other end ground connection GND of the second resistance R2;
The end of oppisite phase of operational amplifier LM358 connects with one end of the 3rd resistance R3 and one end of the 4th resistance R4 respectively, and the other end of the 3rd resistance R3 is connected with the output Vi of current sensor;
The output of operational amplifier LM358 is connected with the other end of the 4th resistance R4 and one end of the 5th resistance R5 respectively, the other end of the 5th resistance R5 is connected with the current sampling pin of UC3844 chip, one end of 6th resistance R6 is connected with the other end of the 5th resistance, the other end ground connection GND of the 6th resistance R6.
Concrete, Figure 5 shows that the concrete structure schematic diagram of the first regulating circuit, as shown in Figure 5, the first regulating circuit comprises:
Diode D1, the 7th resistance R7, the 8th resistance R8, electric capacity C1,
Concrete annexation is: the negative electrode of diode D1 is connected with the output pin of UC3844 chip, the anode of diode D1 is connected with one end of one end of electric capacity C1, the 7th resistance R7 and one end of the 8th resistance R8, the other end of the 7th resistance R7 is connected with supply voltage VCC, the other end of the 8th resistance R8 is connected with one end of one end of the first resistance R1 and the second resistance R2, the other end ground connection GND of electric capacity C1.
Wherein, it is the thin-film capacitor that high frequency characteristics is good that C1 requires, D1 requires fast recovery diode.
Further, Figure 6 shows that the overall structure schematic diagram of convertor controls regulating circuit, as shown in Figure 6,
Suppose DC-DC switch converters provided by the invention, bus input voltage range 200V-400V, normal working voltage is 320V, under-voltage lower than 200V bus.When inlet highway voltage is between 200V-320V, convertor controls regulating circuit can regulate the output current of former limit circuit, thus the power output of restriction DC-DC switch converters.
Suppose that DC-DC switch converters is forward converter, then the input voltage of forward converter and the relational expression of output voltage are:
V
out＝V
in×N×D
Wherein, V
infor bus input voltage, V
outfor output voltage, N is transformer voltage ratio, and D is PWM duty ratio.
In the present embodiment, when normal working bus bar is input as 320V, electric current when current sampling pin voltage is 1V is the peak current of switch converters.According to above-mentioned formula, as inlet highway input voltage 200V-320V, be also V
inreduce, for keeping output voltage V
outconstant, duty ratio will be caused to become large.
Adopt TI company power management chip UC3844 control DC-DC switch converters, adopt peak current algorithm to control to DC-DC switch converters.The current sample pin of UC3844 is the output peak current of restriction converter, and output pin is that to export certain frequency amplitude be the duty ratio of VCC adjustable PWM cycle is T square-wave signal (frequency size is configured by 4 pin).The voltage signal of UC3844 chip service manual display current sample pin is more than 1V, and output voltage pin can seal ripple, and the electric current when voltage of current sample pin is IV is the peak current of DC-DC switch converters.
Wherein, V
cCfor 12V, V
ifor the voltage signal of current sensor and Vi increase with the output current of UC3844 chip and linearly reduce.In Fig. 6, A point voltage is Va, B point voltage is Vref.When UC3844 exports as high level (amplitude is Vcc, and the time is D*T), the reverse-biased cut-off of diode D1.
A point voltage Va is:
Wherein, V
afor a point voltage, V
ccfor supply voltage, R
7for the resistance of resistance R7, D is PWM duty ratio, and T is PWM adjustment cycle.
Continue according to above-mentioned citing, when duty ratio becomes large, be also that the duty ratio of output pin output square wave in a switch periods rises, in Fig. 6, diode D1 raises deadline, and A point voltage Va rises as shown from the above formula.
B point voltage V
+for:
Wherein, V
+for B point voltage, V
ccfor supply voltage, R
1for the resistance of resistance R1, R
2for the resistance of resistance R2, R
7for the resistance of resistance R7, R
8for the resistance of resistance R8, V
afor a point voltage.
Continue according to above-mentioned citing, when A point voltage Va rises, according to above formula, B point voltage V
+raise.
The current sampling pin voltage V of UC3844
3for:
Wherein, V
3for the current sampling pin voltage of UC3844, R
3for the resistance of resistance R3, R
4for the resistance of resistance R4, R
5for the resistance of resistance R5, R
6for the resistance of resistance R6, Vi is the voltage corresponding to accumulator load charging current of current sampler sampling, V
+for B point voltage.
Continuing according to above-mentioned citing, for keeping output pin not by envelope ripple, also, the voltage V of current sample pin must be kept
3be less than or equal to 1V, Vi linearly increases, therefore B point voltage V with the reduction of the output current of output pin
+during rising, only has Vi rising guarantee V
3be less than or equal to 1V, export maximum current relative to having reset load like this, also namely reducing output current.The power that converter exports will reduce, and because the electric current in MOSFET or IGBT does not increase, thus serves the effect of protection MOSFET or IGBT.So just avoid problem excessive by the electric current of MOSFET or IGBT in prior art from hardware circuit.
Further, Figure 7 shows that the topological diagram of the DC-DC switch converters that another embodiment of the present invention provides, as shown in Figure 7, that the present embodiment provides is 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 inputs to voltage sampling signal corresponding to the output voltage of variator control chip 2 pin, it should be noted that, the charge current sample signal that accumulator load is corresponding can be exported before outputting inductance L, and (current regulating circuit comprises the current sample transducer in above-described embodiment this signal to be exported to current regulating circuit, discharge circuit and the first regulating circuit), variator control chip is exported to after current regulating circuit processes described charge current sample signal, also voltage sampling signal corresponding for output voltage can be exported to variator control chip, variator control chip regulates duty ratio according to receiver voltage sampled signal, according to duty ratio adjustment maximum output current, owing to resetting the maximum current that two-transistor forward converter exports accumulator load to according to duty ratio, thus reduce charging current corresponding to accumulator load, thus reduce the power output of two-transistor forward converter, and then force the input current of two-transistor forward converter not increase when input voltage reduces, VT1 and VT2 protected in two-transistor forward converter does not burn out because of big current.
Last it is noted that above each embodiment is only in order to illustrate technical scheme of the present invention, be not intended to limit; Although with reference to foregoing embodiments to invention has been detailed description, those of ordinary skill in the art is to be understood that: it still can be modified to the technical scheme described in foregoing embodiments, or carries out equivalent replacement to wherein some or all of technical characteristic; And these amendments or replacement, do not make the essence of appropriate technical solution depart from the scope of various embodiments of the present invention technical scheme.
Claims (8)
1. a DC-DC switch converter, is characterized in that, comprising:
Former limit circuit, for exporting the first corresponding for electrokinetic cell voltage to translation circuit;
Described translation circuit, for described first voltage drop being low to moderate the second voltage corresponding to secondary circuit according to default step-down ratio and duty ratio, and exporting described second voltage to described secondary circuit, described second voltage is the output voltage of described DC-DC switch converter;
Described secondary circuit, for exporting described second voltage received to accumulator load, to make described accumulator load charge, and export charge current sample signal corresponding for the charging current of the second corresponding for described second voltage voltage sampling signal and described accumulator load to convertor controls regulating circuit;
Described convertor controls regulating circuit, for when described first voltage drop, the first electric current corresponding to described former limit circuit is reduced, to reduce the power output of described former limit circuit according to described second voltage sampling signal received and described charge current sample signal.
2. converter according to claim 1, is characterized in that, described convertor controls regulating circuit, comprising:
Convertor controls chip,
The Voltage Feedback pin of described convertor controls chip is for receiving described second voltage sampling signal, and the duty ratio of output pulse bandwidth technology PWM ripple according to the change regulation output pin of described second voltage signal.
3. converter according to claim 2, is characterized in that, described convertor controls regulating circuit, also comprises:
Current sample transducer, described current sample transducer obtains described charge current sample signal for described charging current of sampling, described charge current sample signal is converted to tertiary voltage, described tertiary voltage is exported to the current sampling pin of described convertor controls chip by operational amplifier.
4. converter according to claim 3, is characterized in that, described convertor controls regulating circuit also comprises:
Discharge circuit and the first regulating circuit,
The in-phase input end of described discharge circuit is connected with supply voltage, the inverting input of described discharge circuit is connected with the output of the output of described current sampler and described discharge circuit, for described tertiary voltage is carried out negative feedback, the output of described discharge circuit is connected with the current sampling pin of described convertor controls chip, for the negative feedback result of described tertiary voltage being exported to the current sampling pin of described convertor controls chip.
The input of described first regulating circuit connects the output pin of convertor controls chip, and the output of described first regulating circuit is connected with described discharge circuit in-phase input end, for regulating the voltage of the in-phase input end of described discharge circuit.
5. converter according to claim 4, is characterized in that, described discharge circuit comprises:
The output of operational amplifier is connected with the current sampling pin of described convertor controls chip, the in-phase end of described operational amplifier is connected with the first regulating circuit respectively and supply voltage connects, and the end of oppisite phase of described operational amplifier is connected with the output of described current sample transducer and the output of described operational amplifier respectively.
6. converter according to claim 5, is characterized in that, described discharge circuit comprises:
The in-phase end of described operational amplifier is connected with one end of the first resistance and one end of the second resistance respectively, and the other end of described first resistance is connected with supply voltage, the other end ground connection of described second resistance;
The end of oppisite phase of described operational amplifier is connected with one end of the 3rd resistance and one end of the 4th resistance respectively, and the other end of described 3rd resistance is connected with the output of current sensor;
The output of described operational amplifier is connected with the other end of described 4th resistance and one end of the 5th resistance respectively, the described other end of the 5th resistance is connected with the current sampling pin of convertor controls chip, one end of 6th resistance is connected with the other end of described 5th resistance, the other end ground connection of described 6th resistance.
7. interchanger according to claim 6, is characterized in that, described first regulating circuit comprises:
The negative electrode of diode is connected with the output pin of described convertor controls chip, the anode of described diode is connected with one end of one end of electric capacity, the 7th resistance and one end of the 8th resistance, the other end of described 7th resistance is connected with supply voltage, the other end of described 8th resistance is connected with one end of one end of described first resistance and described second resistance, the other end ground connection of described electric capacity.
8. the converter according to claim 1-7, is characterized in that, described convertor controls chip is UC3844 chip.
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| CN106571743A (en) * | 2016-09-13 | 2017-04-19 | 南昌大学 | Two-transistor forward switching power supply circuit |
| CN106571743B (en) * | 2016-09-13 | 2023-07-28 | 南昌大学 | Double-tube forward switch power supply circuit |
| CN107046276A (en) * | 2017-03-03 | 2017-08-15 | 广东欧珀移动通信有限公司 | Switch power supply voltage protection circuit and voltage conversion apparatus |
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| Publication number | Publication date |
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| CN104811045B (en) | 2017-10-13 |
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