CN112671245A - Control signal generating circuit and switching power supply - Google Patents
Control signal generating circuit and switching power supply Download PDFInfo
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- CN112671245A CN112671245A CN202011452126.4A CN202011452126A CN112671245A CN 112671245 A CN112671245 A CN 112671245A CN 202011452126 A CN202011452126 A CN 202011452126A CN 112671245 A CN112671245 A CN 112671245A
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Abstract
The scheme discloses a control signal generating circuit which is characterized by comprising a signal superposition unit, a switch unit, a comparator and a controller; the output end of the switch unit is connected with the input end of the signal superposition unit; the signal superposition unit is used for superposing the preprocessed current signal to be detected and a first path of adjusting signal transmitted by the switch unit and then outputting a first comprehensive signal; or the preprocessed current signal to be detected and the second path of adjusting signal transmitted by the switch unit are superposed to output a second comprehensive signal. By using the circuit of the scheme, the problems that the peak detection voltage is easily interfered by noise and the power output is unstable due to too small current detection resistance are solved; secondly because the resistance of the current detection resistor that uses is less, be favorable to improving the work efficiency of power, this scheme gathers together each compensation function module in addition, has simplified circuit structure.
Description
Technical Field
The invention relates to the technical field of current detection of a switching power supply, in particular to a control signal generating circuit and a switching power supply.
Background
The current control of the voltage-current mode switching power supply is a control method for fixed clock turn-on and peak current turn-off. When the current detection resistor senses that the peak current of the inductor exceeds a set value, the power switch tube of the controller is immediately closed to form cycle-by-cycle current limiting, so that the peak current of the power switch tube is controlled within a certain range when any input voltage and load change in a transient state, and the main switch tube is effectively protected during overload and short circuit. The peak current mode control has the advantages of fast transient closed loop response and fast transient response to changes in input voltage and changes in output load.
Current detection resistor RsWhen the power-saving switch works, power is inevitably consumed, and the larger the resistance value of the resistor is, the more power is consumed; if the resistance value of the resistor is too small, the current detection voltage is too low and is easily interfered by other signals, so that the peak current detection is misjudged, and the power supply works abnormally.
Disclosure of Invention
An object of this scheme is to provide a control signal generating circuit, detect and control the peak current of switching power supply through this control signal generating circuit, the circuit that uses this scheme can use the current detection resistance that the resistance value is littleer to improve the work efficiency of power, simplify circuit structure.
In order to achieve the purpose, the scheme is as follows:
a control signal generating circuit comprises a signal superposition unit, a switch unit, a comparator and a controller;
the output end of the switch unit is connected with the input end of the signal superposition unit;
the signal superposition unit is used for superposing the preprocessed current signal to be detected and a first path of adjusting signal transmitted by the switch unit and then outputting a first comprehensive signal; or
And the signal superposition unit superposes the preprocessed current signal to be detected and the second path of adjusting signal transmitted by the switch unit and then outputs a second comprehensive signal.
The output end of the signal superposition unit is connected with the positive input end of the comparator;
the negative input end of the comparator is connected with the reference voltage, and the output end of the comparator is connected with the input end of the controller;
the output end of the controller is used as the output end of the control circuit to output a control signal.
Preferably, the signal superimposing unit includes: the first signal input end, the second signal input end, the output end and the fourth resistor;
the first signal input end inputs a preprocessed current signal to be detected; the second signal input end is connected with the switch unit, the output end outputs a first comprehensive signal or a second comprehensive signal, one end of the fourth resistor is connected between the first signal input end and the second signal input end, and the other end of the fourth resistor is connected with a grounded positive voltage regulator.
Preferably, the switching unit includes: a first switch comprising a first switch input and a first switch output, and a second switch comprising a second switch input and a second switch output;
the first switch output end is connected with the second signal input end, and the first path of adjusting signal is input from the first switch input end and is transmitted to the signal superposition unit from the first switch output end;
the second switch output end is connected with the second signal input end, and the second path of adjusting signal is input from the second switch input end and transmitted to the signal superposition unit from the second switch output end.
Preferably, the device further comprises a signal amplifying circuit and a potential shifting circuit; the output end of the signal amplification circuit is connected with the input end of the potential translation circuit, and the output end of the potential translation circuit is connected with the first signal input end of the signal superposition unit.
Preferably, the signal amplifying circuit includes a first operational amplifier, a first resistor and a second resistor;
the positive input end of the first operational amplifier inputs a current signal to be detected, and the output end of the first operational amplifier is used as the output end of the signal amplification circuit;
one end of the first resistor is connected with the negative input end of the first operational amplifier, and the other end of the first resistor is grounded;
and two ends of the second resistor are respectively connected with the negative input end and the output end of the first operational amplifier.
Preferably, the potential shift circuit includes a second operational amplifier, a first transistor, a second transistor, a third transistor, and a third resistor;
the positive input end of the second operational amplifier is connected with the output end of the signal amplification circuit; the output end is connected with the base electrode of the first transistor, the collector electrode of the first transistor is connected with the collector electrode of the second transistor, the collector electrode of the first transistor is connected with the base electrode of the second transistor and the base electrode of the third transistor, the emitter electrode of the second transistor is connected with the emitter electrode of the third transistor, and the collector electrode of the third transistor is used as the output end of the potential translation circuit;
one end of the third resistor is connected with the negative input end of the second operational amplifier and the emitter of the first transistor, and the other end of the third resistor is grounded.
Preferably, the first path of adjustment signal is a periodic slope compensation current signal for compensating the current to be detected; the second path of adjusting signal is an amplitude modulation current signal for adjusting the amplitude of the current to be detected.
In a second aspect, a switching power supply is provided, which includes the control signal generating circuit and a power switching tube as described above, a gate of the power switching tube is connected to an output end of the control circuit, a control signal output by the control circuit controls the power switching tube to be turned off, and the current to be detected is a current of the power switching tube.
The scheme has the following beneficial effects:
by using the control signal generating circuit, the problems that the peak detection voltage is easily interfered by noise and the power output is unstable due to too small current detection resistance are solved; secondly because the resistance of the current detection resistor that uses is less, be favorable to improving the work efficiency of power, the circuit of this scheme gathers together each compensation function module in addition, has simplified circuit structure.
Drawings
In order to illustrate the implementation of the solution more clearly, the drawings that are needed in the description of the embodiments will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the solution, and that other drawings may be derived from these drawings by a person skilled in the art without inventive effort.
FIG. 1 is a schematic diagram of a control signal generating circuit and a power switch tube;
FIG. 2 is a schematic diagram of a signal amplification circuit, a potential shift circuit and a signal superposition unit;
FIG. 3 is a graph of a ramp compensation current waveform;
FIG. 4 is a circuit for generating an amplitude modulated current signal;
101-a signal driving stage; 102-a controller; 103-a comparator; 104-a signal amplification circuit; 105-a potential shift circuit; 106-a signal superposition unit; 107-a switching unit; 112-a first operational amplifier; 113-second operational amplifier.
Detailed Description
Embodiments of the present solution will be described in further detail below with reference to the accompanying drawings. It is clear that the described embodiments are only a part of the embodiments of the present solution, and not an exhaustive list of all embodiments. It should be noted that, in the present embodiment, features of the embodiment and the embodiment may be combined with each other without conflict.
The terms "first," "second," and the like in the description and in the claims, and in the drawings described above, if any, are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It will be appreciated that the data so used may be interchanged under appropriate circumstances such that the embodiments described herein may be practiced otherwise than as specifically illustrated or described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
It should be understood that the term "and/or" as used herein is merely one type of association that describes an associated object, meaning that three relationships may exist, e.g., a and/or B may mean: a exists alone, A and B exist simultaneously, and B exists alone. In addition, the character "/" herein generally indicates that the former and latter related objects are in an "or" relationship.
In order to solve the technical problems of large current detection resistance loss and system efficiency in the prior art, the scheme provides a circuit which can adopt a smaller current detection resistance to improve the anti-interference capability and the system efficiency; and secondly, the circuit control structure is simplified, and the control precision is improved.
Therefore, as shown in fig. 1, the switching power supply includes a control signal generating circuit provided by the present disclosure, and the control signal generating circuit controls the turn-off of the power switch tube in the switching power supply. The control signal generating circuit includes a signal superimposing unit 106, a switching unit 107, a comparator 103, and a controller 102.
Wherein, the output end of the switch unit 107 is connected with the second signal input end of the signal superposition unit 106; the signal superposition unit 106 superposes the preprocessed power switch tube current signal input through the first signal input end of the signal superposition unit 106 and the first path of adjusting signal transmitted through the switch unit 107, and then outputs a first comprehensive signal; or the signal superimposing unit 106 superimposes the preprocessed power switch tube current signal input through the first signal input end of the signal superimposing unit 106 and the second path of adjusting signal transmitted through the switch unit 107, and then outputs a second comprehensive signal.
The output end of the signal superposition unit 106 is connected with the positive input end of the comparator 103, and the output end of the comparator 103 is connected with the input end of the controller 102; the negative input of the comparator 103 is connected to a reference voltage; when the first integrated signal or the second integrated signal output by the signal superimposing unit 106 is greater than a preset threshold, the controller 102 connected to the comparator 103 outputs a control signal.
The gate of the power switch Q1 is connected to the output of the controller 102, and the control signal output by the controller 102 controls the turn-off of the power switch. Preferably, in order to better acquire the control signal output by the controller 102, a signal driving stage 101 is disposed between the controller 102 and the power switch Q1, and the signal driving stage 101 transmits the control signal of the controller 102 to the power switch Q1.
In one embodiment, the preset threshold in the comparator 103 may be a power switch peak current reference voltage.
In one embodiment, the control signal generating circuit may further include a signal amplifying circuit 104 and a potential shifting circuit 105 for preprocessing the current signal of the power switch tube; the output end of the signal amplification circuit 104 is connected to the input end of the level shift circuit 105, and the output end of the level shift circuit 105 is connected to the first signal input end of the signal superposition unit 106. The signal amplification circuit 104 detects the slave current detection resistor RsThe obtained voltage signal is amplified and then transmitted to the level shift circuit 105, and the level shift circuit 105 shifts up the voltage signal by a fixed positive potential and outputs the voltage signal to the first signal input end of the signal superposition unit 106.
As shown in fig. 2, in one embodiment, the signal amplification circuit 104 includes a first operational amplifier 112, a first resistor R1 and a second resistor R2; a positive input terminal of the first operational amplifier 112 inputs the current detection signal, and an output terminal thereof is connected to the level shift circuit 105; one end of the first resistor R1 is connected to the negative input terminal of the first operational amplifier 112, and the other end is grounded; the two ends of the second resistor R2 are connected to the negative input terminal and the output terminal of the first operational amplifier 112, respectively.
In one embodiment, the potential shift circuit 105 includes a second operational amplifier 113, a first transistor Q2, a second transistor Q3, a third transistor Q4, and a third resistor R3;
the positive input end of the second operational amplifier 113 is connected with the output end of the signal amplifying circuit 104; the output end is connected with the base of a first transistor Q2, the collector of the first transistor Q2 is connected with the collector of a second transistor Q3, the collector of the first transistor is connected with the base of a second transistor Q3 and the base of a third transistor Q4, the emitter of the second transistor Q3 is connected with the emitter of a third transistor Q3, and the collector of the third transistor Q4 is used as the output end of the potential shift circuit to output signals;
one end of the third resistor R3 is connected to the negative input terminal of the second operational amplifier 113 and the emitter of the first transistor Q2, and the other end is grounded.
In one embodiment, the signal superimposing unit 106 includes a first signal input terminal, a second signal input terminal, an output terminal, and a fourth resistor R4;
the first signal input terminal inputs the signal output by the level shift circuit 105; the second signal inputs the first or second adjusting signal transmitted by the switch unit 107, the output end outputs the first or second integrated signal, one end of the fourth resistor R4 is connected between the first and second signal input ends, and the other end is connected to the grounded positive voltage regulator VmAnd (4) connecting.
The switch unit 107 comprises a first switch k1, a first switch input end and a first switch output end, the first switch output end is connected with the second signal input end of the signal superposition unit 106, and the slope compensation current signal is input from the first switch input end and is transmitted to the signal superposition unit 106 from the first switch output end;
and the signal superposition unit 106 further comprises a second switch k2, a second switch input end and a second switch output end, wherein the second switch output end is connected with the second signal input end of the signal superposition unit 106, and the amplitude modulation current signal is input from the second switch input end and is transmitted to the signal superposition unit 106 from the second switch output end.
In one embodiment, as shown in fig. 3, the first adjusting signal is preferably a periodic slope compensation current signal for compensating the current flowing into the power switch tube; as shown in fig. 4, the second path of adjusting signal is an amplitude modulation current signal for adjusting the amplitude of the current flowing into the power switch tube.
As shown in fig. 1 and fig. 2, when the power supply system is powered on and the power supply control circuit is started to enter the operating state, the power switching transistor (power MOS transistor) Q1 is turned on at a fixed cycle time T, and R2/R1 of the signal amplification circuit 104 and the potential shift circuit 105 is (n-1), and R3 is R4. When Q1 is closed, current detection resistor RsVoltage V onsIs at zero potential; when the Q1 is turned on, the primary inductor current of the transformer T4 gradually rises, and the current detection resistor RsVoltage V onsGradually rises to generate a voltage Δ Vs, enters the signal amplifying circuit 104, is amplified by n times by the signal amplifying circuit 104, and then enters the signal amplifying circuit with the voltage n Δ VsInto the potential shift circuit 105; level shift circuit 105 shifts n Δ Vs up by a fixed positive potential VmAnd finally with Vm+n△VsThe voltage enters the signal superimposing unit 106.
The ramp compensation current signal enters the signal superposition unit 106 through the first switch k1, and the ramp compensation current waveform diagram is shown in fig. 3. When the duty ratio of the switching signal is less than 50%, signals transmitted to the switching unit 107 and generated by other circuits in the switching power supply are low-level signals, and the first switch k1 is not turned on; when the duty ratio of the switching signal is greater than 50%, the signal transmitted to the switching unit 107 generated by other circuits in the switching power supply is a high level signal, and the first switch k1 is turned on.
As shown in fig. 4, the amplitude modulation current signal is output from an adjustable constant current source, and when the load detection device disposed in the switching power supply detects that the load current is changed from large to small, the output voltage signal applied to both ends of the constant current source is also changed from large to small, and therefore, the current signal generated by the constant current source is changed from large to small. The amplitude modulation current signal is transmitted to the signal superposition unit 106 through the switch k2, when the duty ratio of the switching signal is greater than 50%, signals transmitted to the switching unit 107 and generated by other circuits in the switching power supply are high-level signals, and the second switch k2 is not turned on; when the duty ratio of the switching signal is less than 50%, the signal transmitted to the switching unit 107 generated by other circuits in the switching power supply is a low level signal, and the second switch k2 is turned on.
When the duty ratio of the switching signal is more than 50%, the average output current error is caused, and in order to prevent the error, the slope compensation current forces the average output current not to change along with the change of the duty ratio, so that the system is stabilized.
The amplitude modulation current gradually adjusts the current limit value along with the load current from large to small, so that the current amplitude is gradually reduced, and the system efficiency is improved.
As shown in fig. 2, the signal superimposing unit 106 may comprise a fixed resistor R4, wherein one end of the fourth resistor R4 is connected to the collector of the third transistor, and the other end is connected to the grounded positive voltage regulator VmConnecting; collector of the switching unit 107 and the third transistor Q4The pole is connected to the non-ground terminal of the fourth resistor R4. The current input by the slope compensation current or the amplitude modulation current is superimposed on the voltage input by the level shift circuit 105 at the fixed resistor R4 to generate a current-detected integrated voltage, and the generated integrated voltage is input to the comparator 103.
The comparator 103 compares the current detection integrated voltage with the peak current reference voltage, and if the current detection integrated voltage is greater than the peak current reference voltage, the comparator outputs a signal to the controller 102 through the input terminal a of the controller 102, the controller 102 outputs a shutdown signal to the signal driving stage 101 based on the signal, and the power switch Q1 is turned off based on the amplified shutdown signal.
The adjusting signal output circuit provided by the scheme extremely comprises a control signal generating circuit of the circuit, and a smaller current detection resistor can be adopted to improve the anti-interference capability and the system efficiency; and secondly, the circuit control structure is simplified, and the control precision is improved.
In this embodiment, the input terminal of the controller 102 inputs the output signal of the comparator 103, and based on this signal, the controller 102 sends out a control signal for turning off the power switch Q1. However, the input end of the controller 102 may also input a control signal for the controller 102 to send out a control signal for turning on the power switch Q1, and the turning on signal is not included in the embodiment, and therefore, not shown in the drawings but described in more detail in the embodiment.
It should be understood that the above-mentioned embodiments of the present invention are only examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention, and it will be obvious to those skilled in the art that other variations or modifications may be made on the basis of the above description, and all embodiments may not be exhaustive, and all obvious variations or modifications belonging to the technical solutions of the present invention are within the scope of the protection of the present invention.
Claims (8)
1. A control signal generating circuit is characterized by comprising a signal superposition unit, a switch unit, a comparator and a controller;
the output end of the switch unit is connected with the input end of the signal superposition unit;
the signal superposition unit is used for superposing the preprocessed current signal to be detected and a first path of adjusting signal transmitted by the switch unit and then outputting a first comprehensive signal; or
The signal superposition unit outputs a second comprehensive signal after superposing the preprocessed current signal to be detected and a second path of adjusting signal transmitted by the switch unit;
the output end of the signal superposition unit is connected with the positive input end of the comparator;
the negative input end of the comparator is connected with the reference voltage, and the output end of the comparator is connected with the input end of the controller;
the output end of the controller is used as the output end of the control circuit to output a control signal.
2. The control signal generating circuit according to claim 1, wherein the signal superimposing unit includes: the first signal input end, the second signal input end, the output end and the fourth resistor;
the first signal input end inputs a preprocessed current signal to be detected; the second signal input end is connected with the switch unit, the output end outputs a first comprehensive signal or a second comprehensive signal, one end of the fourth resistor is connected between the first signal input end and the second signal input end, and the other end of the fourth resistor is connected with a grounded positive voltage regulator.
3. The control signal generating circuit according to claim 2, wherein the switching unit includes: a first switch comprising a first switch input and a first switch output, and a second switch comprising a second switch input and a second switch output;
the first switch output end is connected with the second signal input end, and the first path of adjusting signal is input from the first switch input end and is transmitted to the signal superposition unit from the first switch output end;
the second switch output end is connected with the second signal input end, and the second path of adjusting signal is input from the second switch input end and transmitted to the signal superposition unit from the second switch output end.
4. The control signal generating circuit according to claim 1, further comprising a signal amplifying circuit and a potential shifting circuit for preprocessing a current signal to be detected; the output end of the signal amplification circuit is connected with the input end of the potential translation circuit, and the output end of the potential translation circuit is connected with the first signal input end of the signal superposition unit.
5. The control signal generating circuit according to claim 4, wherein the signal amplifying circuit includes a first operational amplifier, a first resistor and a second resistor;
the positive input end of the first operational amplifier inputs a current signal to be detected, and the output end of the first operational amplifier is used as the output end of the signal amplification circuit;
one end of the first resistor is connected with the negative input end of the first operational amplifier, and the other end of the first resistor is grounded;
and two ends of the second resistor are respectively connected with the negative input end and the output end of the first operational amplifier.
6. The control signal generation circuit according to claim 4, wherein the potential shift circuit includes a second operational amplifier, a first transistor, a second transistor, a third transistor, and a third resistor;
the positive input end of the second operational amplifier is connected with the output end of the signal amplification circuit; the output end is connected with the base electrode of the first transistor, the collector electrode of the first transistor is connected with the collector electrode of the second transistor, the collector electrode of the first transistor is connected with the base electrode of the second transistor and the base electrode of the third transistor, the emitter electrode of the second transistor is connected with the emitter electrode of the third transistor, and the collector electrode of the third transistor is used as the output end of the potential translation circuit;
one end of the third resistor is connected with the negative input end of the second operational amplifier and the emitter of the first transistor, and the other end of the third resistor is grounded.
7. The control signal generating circuit according to claim 1, wherein the first adjusting signal is a periodic slope compensation current signal for compensating the current to be detected; the second path of adjusting signal is an amplitude modulation current signal for adjusting the amplitude of the current to be detected.
8. A switching power supply, characterized by comprising the control signal generating circuit and a power switch tube according to any one of claims 1 to 7, wherein the gate of the power switch tube is connected to the output end of the control circuit, the control signal output by the control circuit controls the power switch tube to be turned off, and the current to be detected is the current of the power switch tube.
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| CN202011452126.4A CN112671245B (en) | 2020-12-10 | 2020-12-10 | Control signal generating circuit and switching power supply |
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| CN202011452126.4A CN112671245B (en) | 2020-12-10 | 2020-12-10 | Control signal generating circuit and switching power supply |
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| CN112671245B CN112671245B (en) | 2023-03-21 |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104333216A (en) * | 2014-11-28 | 2015-02-04 | 矽力杰半导体技术(杭州)有限公司 | Switching power supply controller and control method thereof |
| CN112054658A (en) * | 2020-09-16 | 2020-12-08 | 杰华特微电子（杭州）有限公司 | Control method and control circuit of switching power supply circuit and switching power supply |
| CN214045425U (en) * | 2020-12-10 | 2021-08-24 | 无锡市晶源微电子有限公司 | Adjusting signal output circuit, control signal generating circuit and switching power supply |
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2020
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104333216A (en) * | 2014-11-28 | 2015-02-04 | 矽力杰半导体技术(杭州)有限公司 | Switching power supply controller and control method thereof |
| US20160156259A1 (en) * | 2014-11-28 | 2016-06-02 | Silergy Semiconductor Technology (Hangzhou) Ltd. | Controller and controlling method of switching power supply |
| CN112054658A (en) * | 2020-09-16 | 2020-12-08 | 杰华特微电子（杭州）有限公司 | Control method and control circuit of switching power supply circuit and switching power supply |
| CN214045425U (en) * | 2020-12-10 | 2021-08-24 | 无锡市晶源微电子有限公司 | Adjusting signal output circuit, control signal generating circuit and switching power supply |
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