CN104460812B - The output commutation diode temperature-compensation circuit of a kind of former limit feedback converter - Google Patents

The output commutation diode temperature-compensation circuit of a kind of former limit feedback converter Download PDF

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CN104460812B
CN104460812B CN201410852284.7A CN201410852284A CN104460812B CN 104460812 B CN104460812 B CN 104460812B CN 201410852284 A CN201410852284 A CN 201410852284A CN 104460812 B CN104460812 B CN 104460812B
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resistance
former limit
circuit
discharge circuit
commutation diode
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CN104460812A (en
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朱樟明
吴强
过伟
刘帘曦
杨银堂
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Xidian University
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Xidian University
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Abstract

The invention provides the output commutation diode temperature-compensation circuit of a kind of former limit feedback converter, comprising: unit buffer, the first resistance be directly proportional to temperature coefficient, current source and filtering circuit; Wherein, the input end of unit buffer connects a standard voltage source, and output terminal is connected with one end of the first resistance, and unit buffer is connected with the positive pole of a logic power; The other end of the first resistance is connected with one end of filtering circuit with the positive pole of current source respectively, the minus earth of current source, and be connected with the other end of filtering circuit, and filtering circuit is provided with a bucking voltage output terminal be connected for the in-phase end of the error amplifier with former limit feedback switch power-supply controller of electric.The solution of the present invention is applied in the switch power supply system of former limit feedback system, can improve the temperature characterisitic of output voltage.

Description

The output commutation diode temperature-compensation circuit of a kind of former limit feedback converter
Technical field
The present invention relates to basic electronic circuit technical field, particularly relate to the output commutation diode temperature-compensation circuit of a kind of former limit feedback converter.
Background technology
In recent years, along with the update of significantly increase and the various electronic product of consumption electronic product demand, the requirement of people to power supply is also more and more higher.Adopt the anti exciting converter of former limit feedback system due to its structure simple, with low cost, the advantages such as electrical separation is good, and volume is little, are widely used in small-power power at present.Adopt the transducer of flyback topologies structure, more easily realize low standby power loss, it is more and more extensive that this makes it apply under the slogan of current promotion green energy conservation type society.But, due to the difference of feedback system, in the transducer that former limit is fed back, need to carry out sampling to obtain feedback voltage to auxiliary winding.The pressure drop exporting commutation diode is contained in auxiliary winding samples the voltage that obtains.When the temperature is changed, the pressure drop of output diode can change along with the change of temperature, therefore causes the voltage of sampling inaccurate, and affects the precision of output voltage.
Summary of the invention
The technical problem to be solved in the present invention is to provide the output commutation diode temperature-compensation circuit of a kind of former limit feedback converter, is applied in the switch power supply system of former limit feedback system, can improves the temperature effect of output voltage.
In order to solve the problems of the technologies described above, the present invention adopts following technical scheme:
According to one aspect of the present invention, provide the output commutation diode temperature-compensation circuit of a kind of former limit feedback converter, comprising:
Unit buffer, the first resistance be directly proportional to temperature coefficient, current source and filtering circuit;
Wherein, the input end of described unit buffer connects a standard voltage source, and output terminal is connected with one end of described first resistance, and described unit buffer is connected with the positive pole of a logic power;
The other end of described first resistance is connected with one end of filtering circuit with the positive pole of described current source respectively, the minus earth of described current source, and be connected with the other end of filtering circuit, and described filtering circuit is provided with a bucking voltage output terminal be connected for the in-phase end of the error amplifier with former limit feedback switch power-supply controller of electric.
Wherein, described unit buffer comprises the first discharge circuit and the second discharge circuit, and the input end of described first discharge circuit connects a standard voltage source, the output terminal of described first discharge circuit is connected with the input end of the second discharge circuit, and the second discharge circuit is connected with the positive pole of a logic power, the output terminal of the second discharge circuit is connected with one end of described first resistance.
Wherein, described first discharge circuit is integrated operational amplifier, the in-phase end of described integrated operational amplifier connects a standard voltage source, and end of oppisite phase is connected with one end of described first resistance, and the output terminal of described integrated operational amplifier is connected with the input end of described second discharge circuit.
Wherein, described second discharge circuit comprises the first electric capacity, the second resistance and P-type mos field effect (MOS) pipe;
Wherein, the output terminal of described first discharge circuit is connected with the grid of described P type metal-oxide-semiconductor, and the source electrode of described P type metal-oxide-semiconductor is connected with the positive pole of a logic power, described first electric capacity and the second resistant series and be attempted by P type metal-oxide-semiconductor grid and drain electrode, and described drain electrode is connected with one end of described first resistance.
Wherein, described current source is constant current source.
Wherein, described filtering circuit comprises the 3rd resistance and the second electric capacity, and one end of described 3rd resistance is connected with the positive pole of described current source, the other end is connected with one end of described second electric capacity, the other end of described second electric capacity is connected with the negative pole of described current source, and the other end of described 3rd resistance is the bucking voltage output terminal be connected for the in-phase end of the error amplifier with former limit feedback switch power-supply controller of electric.
The invention has the beneficial effects as follows:
The output commutation diode temperature-compensation circuit of former limit of the present invention feedback converter, comprises a unit buffer, the first resistance of a positive temperature coefficient (PTC) and a current source and a filtering circuit.When the temperature increases, the resistance of the first resistance increases with the rising of temperature, and the electric current flowing through the first resistance is constant, then the first ohmically voltage drop increases.Again because the normal voltage of input is maintained steady state value by unit buffer, and the output voltage in the solution of the present invention equals standard voltage value deducts the first ohmically voltage drop, so can draw, output voltage in the solution of the present invention reduces with the rising of temperature, compensates export the commutation diode detection low voltage caused when temperature raises with this.In like manner, the detection voltage that the output voltage of the present invention program can raise to compensate output commutation diode caused when temperature reduces when the temperature decreases raises.
Accompanying drawing explanation
Fig. 1 represents the schematic diagram of the output commutation diode temperature-compensation circuit of the former limit feedback converter of the embodiment of the present invention;
Fig. 2 represents the feedback control loop schematic diagram of former limit feedback switch power-supply controller of electric.
Wherein in figure: 101, unit buffer; 102, filtering circuit; R1, the first resistance; I, current source; Vref0, standard voltage source; The positive pole of VDD, logic power; Vref, bucking voltage output terminal; Op, integrated operational amplifier; C1, the first electric capacity; R2, the second resistance; P1, P type metal-oxide-semiconductor; G, grid; S, source electrode; D, drain electrode; R3, the 3rd resistance; C2, the second electric capacity; 103, feedback voltage testing circuit; 104, error amplifier; 105, logic control element; 106, flyback transformer; R6, the 6th resistance; R7, the 7th resistance; D1, output commutation diode; Co, output capacitance; R4, the 4th resistance; R5, the 5th resistance.
Embodiment
Below with reference to accompanying drawings exemplary embodiment of the present disclosure is described in more detail.Although show exemplary embodiment of the present disclosure in accompanying drawing, however should be appreciated that can realize the disclosure in a variety of manners and not should limit by the embodiment set forth here.On the contrary, provide these embodiments to be in order to more thoroughly the disclosure can be understood, and complete for the scope of the present disclosure can be conveyed to those skilled in the art.
According to an aspect of the embodiment of the present invention, provide the output commutation diode temperature-compensation circuit of a kind of former limit feedback converter, as shown in Figure 1, this circuit comprises: unit buffer 101, the the first resistance R1 be directly proportional to temperature coefficient, current source I and filtering circuit 102;
Wherein, the input end of described unit buffer 101 connects a standard voltage source Vref0, and output terminal is connected with one end of described first resistance R1, and described unit buffer 101 is connected with the positive pole VDD of a logic power;
The other end of described first resistance R1 is connected with one end of filtering circuit 102 with the positive pole of described current source I respectively, the minus earth of described current source I, and be connected with the other end of filtering circuit 102, and described filtering circuit 102 is provided with a bucking voltage output terminal Vref be connected for the in-phase end of the error amplifier with former limit feedback switch power-supply controller of electric.
Alternatively, current source I is constant current source, and the current constant that flows through in the first resistance R1 can be made constant.
As shown in Figure 1, in the output commutation diode temperature-compensation circuit of the former limit feedback converter of the embodiment of the present invention, unit buffer 101 makes the voltage constant of first resistance R1 one end be the magnitude of voltage V of standard voltage source Vref0 i.The magnitude of voltage Vo exported due to bucking voltage output terminal Vref again equals the magnitude of voltage V of standard voltage source Vref0 ideduct the voltage drop of the first resistance R1, i.e. Vo=V i-r 1i, wherein r 1represent the resistance value of the first resistance R1, i represents the current value flowing through the first resistance R1, V irepresent the magnitude of voltage of standard voltage source Vref0.Because R1 is the resistance of positive temperature coefficient (PTC), so when the temperature increases, r 1increase, thus Vo reduces; When the temperature decreases, r 1reduce, thus Vo increases.
Alternatively, described unit buffer 101 comprises the first discharge circuit and the second discharge circuit, and the input end of described first discharge circuit connects a standard voltage source Vref0, the output terminal of described first discharge circuit is connected with the input end of the second discharge circuit, and the second discharge circuit is connected with the positive pole VDD of a logic power, the output terminal of the second discharge circuit is connected with one end of described first resistance R1.
The output commutation diode temperature-compensation circuit of former limit of the present invention feedback converter, be applied in the switch power supply system of former limit feedback system, bucking voltage output terminal Vref in the embodiment of the present invention is connected to the normal phase input end of error amplifier 104 as shown in Figure 2, the temperature characterisitic of output voltage can be improved.
As shown in Figure 2, chip periphery, feedback control loop includes divider resistance, i.e. the 6th resistance R6 and the 7th resistance R7, flyback transformer 106, exports commutation diode D1 and output capacitance Co.Output voltage V outthe divider resistance external by anti exciting converter 106 detects, then feedback voltage V fbcomputing formula be:
V fb = r 6 r 6 + r 7 · N aux N sec · ( V out + V d 1 )
Wherein, r 6be the resistance value of the 6th resistance R6, r 7be the resistance value of the 7th resistance R7, N auxfor flyback transformer 106 assists the number of turn of winding, N secfor the number of turn of flyback transformer 106 secondary winding, V outfor output voltage, V d1for exporting the conduction voltage drop of commutation diode D1.In above formula, r 6, r 7, N aux, N auxand V outbe definite value, so, feedback voltage V fbwith the conduction voltage drop V exporting commutation diode D1 d1relevant.
Due to when the temperature increases, export the conduction voltage drop V of commutation diode D1 d1can reduce, so can feedback voltage V be caused fbreduce; When the temperature decreases, the conduction voltage drop V of commutation diode D1 is exported d1can raise, so can feedback voltage V be caused fbraise.It can thus be appreciated that the rising of temperature or reduction, will cause feedback voltage V fbcorrespondingly reduce or raise.
At chip internal, comprise feedback voltage testing circuit 103, error amplifier 104, logic control element 105, the 4th resistance R4 and the 5th resistance R5.Chip adjusts output voltage according to feedback voltage by the error amplifier 104 of inside.The output voltage V of feedback voltage testing circuit 103 in the ideal case fb_detequal V fb.The output voltage V of error amplifier 104 eafor:
V ea = Vref 1 + r 4 r 5 ( Vref 1 - V fb )
Wherein, Vref1 represents the voltage of the normal phase input end of error amplifier 104, r 4represent the resistance value of the 4th resistance R4, r 5represent the resistance value of the 5th resistance R5.Do not taking output voltage V outwhen carrying out temperature compensation measure, what the normal phase input end of error amplifier 104 connected is a standard voltage source.So Vref1 is now definite value, due to r 5and r 4also be definite value, therefore, the output voltage V of error amplifier 104 eawith feedback voltage V fbrelevant.Again because V fbreduce with the rising of temperature, the reduction of temperature and increasing, so do not taking output voltage V outwhen carrying out temperature compensation measure, V eareduce with the rising of temperature, the reduction of temperature and increasing.In addition, the V that exported by error amplifier 104 of logic control circuit 105 easize generate modulation signal adjustment output voltage, work as V eaoutput voltage all can be caused time bigger than normal or less than normal to depart from setting value.
When the output commutation diode temperature-compensation circuit of the former limit feedback converter of the embodiment of the present invention as shown in Figure 1, when being connected to the normal phase input end of error amplifier 104 as shown in Figure 2 by bucking voltage output terminal Vref, Vref1 equals the output voltage Vo of bucking voltage output terminal Vref, and the rising due to temperature causes reduction and the V of Vo fbreduction, then according to formula:
V ea = Vo + r 4 r 5 ( Vo - V fb )
Can draw, when the temperature increases, V eacan remain unchanged.In like manner, when the temperature decreases, V earemain unchanged.
Alternatively, as shown in Figure 1, described first discharge circuit is integrated operational amplifier op, the in-phase end of described integrated operational amplifier op connects a standard voltage source Vref0, end of oppisite phase is connected with one end of described first resistance R1, and the output terminal of described integrated operational amplifier op is connected with the input end of described second discharge circuit.
Alternatively, as shown in Figure 1, described second discharge circuit comprises the first electric capacity C1, the second resistance R2 and P type metal-oxide-semiconductor P1;
Wherein, the output terminal of described first discharge circuit is connected with the grid G of described P type metal-oxide-semiconductor P1, and the source S of described P type metal-oxide-semiconductor P1 is connected with the positive pole VDD of a logic power, described first electric capacity C1 connect with the second resistance R2 and be attempted by P type metal-oxide-semiconductor P1 grid G and drain D, and described drain D is connected with one end of described first resistance R1.
Alternatively, described filtering circuit 102 comprises the 3rd resistance R3 and the second electric capacity C2, and one end of described 3rd resistance R3 is connected with the positive pole of described current source I, the other end is connected with one end of described second electric capacity C2, the other end of described second electric capacity C2 is connected with the negative pole of described current source I, and the other end of described 3rd resistance R3 is the bucking voltage output terminal Vref be connected for the in-phase end of the error amplifier with former limit feedback switch power-supply controller of electric.
It is appreciated of course that, the output commutation diode temperature-compensation circuit of the former limit feedback converter of the embodiment of the present invention, for the physical circuit form of the first discharge circuit, the second discharge circuit and filtering circuit 102, be not limited thereto, as long as the first discharge circuit and the second discharge circuit can be made can to form unit buffer 101, filtering circuit 102 can ensure the stable of the voltage that bucking voltage output terminal Vref exports.
Above-described is the preferred embodiment of the present invention; should be understood that the ordinary person for the art; can also make some improvements and modifications not departing under principle prerequisite of the present invention, these improvements and modifications are also in protection scope of the present invention.

Claims (6)

1. an output commutation diode temperature-compensation circuit for former limit feedback converter, is characterized in that, comprising: unit buffer, the first resistance be directly proportional to temperature coefficient, current source and filtering circuit;
Wherein, the input end of described unit buffer connects a standard voltage source, and output terminal is connected with one end of described first resistance, and described unit buffer is connected with the positive pole of a logic power;
The other end of described first resistance is connected with one end of filtering circuit with the positive pole of described current source respectively, the minus earth of described current source, and be connected with the other end of filtering circuit, and described filtering circuit is provided with a bucking voltage output terminal be connected for the in-phase end of the error amplifier with former limit feedback switch power-supply controller of electric;
Wherein, the feedback voltage of the anti-phase termination commutation diode of the error amplifier of former limit feedback switch power-supply controller of electric.
2. the output commutation diode temperature-compensation circuit of former limit as claimed in claim 1 feedback converter, it is characterized in that, described unit buffer comprises the first discharge circuit and the second discharge circuit, and the input end of described first discharge circuit connects a standard voltage source, the output terminal of described first discharge circuit is connected with the input end of the second discharge circuit, and the second discharge circuit is connected with the positive pole of a logic power, the output terminal of the second discharge circuit is connected with one end of described first resistance.
3. the output commutation diode temperature-compensation circuit of former limit as claimed in claim 2 feedback converter, it is characterized in that, described first discharge circuit is integrated operational amplifier, the in-phase end of described integrated operational amplifier connects a standard voltage source, end of oppisite phase is connected with one end of described first resistance, and the output terminal of described integrated operational amplifier is connected with the input end of described second discharge circuit.
4. the output commutation diode temperature-compensation circuit of former limit as claimed in claim 2 feedback converter, is characterized in that, described second discharge circuit comprises the first electric capacity, the second resistance and P-type mos field effect metal-oxide-semiconductor;
Wherein, the output terminal of described first discharge circuit is connected with the grid of described P type metal-oxide-semiconductor, and the source electrode of described P type metal-oxide-semiconductor is connected with the positive pole of a logic power, described first electric capacity and the second resistant series and be attempted by P type metal-oxide-semiconductor grid and drain electrode, and described drain electrode is connected with one end of described first resistance.
5. the output commutation diode temperature-compensation circuit of former limit as claimed in claim 1 feedback converter, is characterized in that, described current source is constant current source.
6. the output commutation diode temperature-compensation circuit of former limit as claimed in claim 1 feedback converter, it is characterized in that, described filtering circuit comprises the 3rd resistance and the second electric capacity, and one end of described 3rd resistance is connected with the positive pole of described current source, the other end is connected with one end of described second electric capacity, the other end of described second electric capacity is connected with the negative pole of described current source, and the other end of described 3rd resistance is the bucking voltage output terminal be connected for the in-phase end of the error amplifier with former limit feedback switch power-supply controller of electric.
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US10684634B1 (en) * 2019-01-30 2020-06-16 Quanta Computer Inc. Method and system for compensating for temperature rise effects
CN110739917B (en) * 2019-11-12 2023-09-26 苏州华太电子技术股份有限公司 Temperature compensation circuit based on radio frequency power amplifier

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