CN112736851B - Voltage detection and processing circuit and method, switching power supply circuit and driving chip - Google Patents
Voltage detection and processing circuit and method, switching power supply circuit and driving chip Download PDFInfo
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- CN112736851B CN112736851B CN202011611886.5A CN202011611886A CN112736851B CN 112736851 B CN112736851 B CN 112736851B CN 202011611886 A CN202011611886 A CN 202011611886A CN 112736851 B CN112736851 B CN 112736851B
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- 238000001514 detection method Methods 0.000 title claims abstract description 94
- 238000000034 method Methods 0.000 title abstract description 9
- 239000003990 capacitor Substances 0.000 claims description 13
- 238000003672 processing method Methods 0.000 claims description 13
- 230000009467 reduction Effects 0.000 claims description 8
- 230000010354 integration Effects 0.000 claims description 6
- 230000005347 demagnetization Effects 0.000 claims description 3
- 230000007274 generation of a signal involved in cell-cell signaling Effects 0.000 claims description 2
- 238000004804 winding Methods 0.000 abstract description 8
- 238000010586 diagram Methods 0.000 description 8
- 230000008569 process Effects 0.000 description 6
- 238000005070 sampling Methods 0.000 description 5
- 230000009286 beneficial effect Effects 0.000 description 4
- 230000008859 change Effects 0.000 description 3
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- 230000007704 transition Effects 0.000 description 3
- 239000000463 material Substances 0.000 description 2
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/10—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
- H02H9/04—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess voltage
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/32—Means for protecting converters other than automatic disconnection
Abstract
The application discloses a voltage detection and processing circuit and method, a switching power supply circuit and a driving chip, wherein the voltage detection and processing circuit comprises an output voltage acquisition unit and a processing unit, the output voltage acquisition unit is provided with a first receiving end, a second receiving end and an output end, the first receiving end is used for receiving a first related signal used for representing the negative terminal voltage of the switching power supply circuit, the second receiving end is used for receiving a second related signal used for representing the positive terminal voltage of the switching power supply circuit, the output voltage acquisition unit is used for acquiring a third related signal used for representing the output voltage of the switching power supply, and the output end is used for outputting the third related signal. According to the technical scheme, the voltage signal representing the output voltage of the switching power supply is obtained based on the drain voltage of the transistor, and additional chip pins and transformer winding detection are not needed, so that the functions of high-precision output voltage detection and overvoltage protection are realized. Meanwhile, the structure can be simplified, and the cost is reduced.
Description
Technical Field
The present invention relates to the field of integrated circuit switching power supply technologies, and in particular, to a voltage detection and processing circuit, a switching power supply circuit, and a driving chip.
Background
A switching power supply is widely used in terms of its high efficiency, and various protection functions are generally required in the application to prevent damage caused by abnormal operation, wherein an overvoltage protection function is used to prevent damage caused by breakdown of a chip or a device due to an excessively high output voltage.
The voltage detection schemes related to overvoltage protection in the prior art generally include: the inductor demagnetizing time detection and the volt-second balance or auxiliary winding detection are carried out, wherein the inductor demagnetizing time detection and the volt-second balance scheme have higher requirements on the inductor current and the switching frequency, the misdetection phenomenon is easy to occur when the inductor demagnetizing time detection and the volt-second balance scheme are not suitable for matching, the auxiliary winding detection mode needs to be detected by using an additional transformer winding, the cost is higher, and the structure is complex.
Therefore, a solution with high universality and simple structure needs to be proposed.
Disclosure of Invention
The invention aims to provide a voltage detection and processing circuit, a switching power supply circuit and a driving chip, which are used for solving the problems of low universality and complex structure of a voltage detection scheme in the prior art.
In order to solve the above-mentioned problems, the present invention provides a voltage detection and processing circuit for a switching power supply circuit, the switching power supply circuit has a transistor, the voltage detection and processing circuit is connected to a drain of the transistor, the voltage detection and processing circuit includes:
the output voltage acquisition unit is provided with a first receiving end, a second receiving end and an output end, wherein the first receiving end is used for receiving a first related signal, the first related signal is used for representing negative terminal voltage of the switching power supply circuit, the second receiving end is used for receiving a second related signal, the second related signal is used for representing positive terminal voltage of the switching power supply circuit, the output voltage acquisition unit is used for acquiring a third related signal based on the first related signal and the second related signal, the output end is used for outputting the third related signal, and the third related signal is used for representing output voltage of the switching power supply circuit;
and the processing unit is used for judging whether the switching power supply circuit fails or not based on the third related signal, and performing protection processing when the switching power supply circuit fails.
Optionally, a second receiving terminal of the output voltage acquiring unit is connected to a drain of the transistor, and acquires the second related signal during a demagnetizing period in which the transistor is turned off.
Optionally, the output voltage acquisition unit includes an integration unit and a subtraction unit;
the integrating unit is used for carrying out integrating processing on the first related signal and outputting the first related signal to the subtracting unit;
the subtracting unit is used for subtracting the output of the integrating unit and the second correlation signal and outputting the third correlation signal.
Optionally, the output voltage acquisition unit includes an integration unit and a subtraction unit;
the subtracting unit is used for subtracting the first correlation signal and the second correlation signal and outputting the first correlation signal and the second correlation signal to the integrating unit.
The integrating unit is used for integrating the output of the subtracting unit and outputting the third correlation signal.
Optionally, the voltage detection and processing circuit includes a first voltage reduction circuit, and one end of the first voltage reduction circuit is used for being connected with the drain electrode of the transistor and is used for performing voltage reduction processing on the drain electrode voltage of the transistor.
Optionally, the voltage detection and processing circuit further comprises a sample-and-hold circuit;
one end of the sample-and-hold circuit is connected with the drain electrode of the transistor, and the other end of the sample-and-hold circuit is connected with the output voltage acquisition unit and outputs the second related signal based on the drain voltage of the transistor.
Optionally, the sample-and-hold circuit is further connected to a drive control unit, and the drive control unit is configured to output a control pulse signal to the sample-and-hold circuit and the transistor.
Optionally, the sample-and-hold circuit includes a switch circuit, a delay circuit, a pulse signal generating circuit, and a first capacitor;
the first end of the switching circuit is connected with the drain electrode of the transistor, the second end of the switching circuit is connected with one end of the first capacitor at a second intersection point, and the third end of the switching circuit is connected with the output end of the pulse signal generating circuit;
the input end of the pulse signal generating circuit is connected with the output end of the delay circuit, and the input end of the delay circuit is connected with the drive control unit;
the other end of the first capacitor is grounded, and the second intersection point is used for outputting the second correlation signal.
Optionally, a second receiving end of the output voltage acquisition unit is connected with a positive end of the switching power supply circuit, and receives the second related signal.
Optionally, the voltage detection and processing circuit further includes a second voltage reduction circuit, one end of the second voltage reduction circuit is connected to the positive end of the switching power supply circuit, and the other end of the first receiving end is used for outputting the second related signal.
Optionally, the processing unit includes a comparator and a fault handling circuit;
the first input end of the comparator is used for being connected with the output voltage acquisition unit to receive the third related signal, the second input end of the comparator is used for receiving a threshold voltage, and the output end of the comparator is used for outputting a comparison result to the fault processing circuit;
the fault processing circuit is used for judging whether the switching power supply circuit has faults or not based on the comparison result and triggering a protection signal when the faults occur;
wherein the threshold voltage is preconfigured.
Based on the same inventive concept, the invention also provides a voltage detection and processing method for a switching power supply circuit, wherein the switching power supply circuit is provided with a transistor, and the voltage detection and processing method comprises the following steps:
acquiring a first related signal based on the drain voltage of the transistor, wherein the first related signal is used for representing the negative terminal voltage of the switching power supply circuit;
acquiring a second related signal, wherein the second related signal is used for representing the positive terminal voltage of the switching power supply circuit;
acquiring a third correlation signal based on the first correlation signal and the second correlation signal, wherein the third correlation signal is used for representing the output voltage of the switching power supply;
And judging whether the switching power supply circuit fails or not based on the third related signal, and triggering a protection signal when the switching power supply circuit fails.
Based on the same inventive concept, the application also provides a switching power supply circuit, which comprises the voltage detection and processing circuit of any one of the above characteristic descriptions.
Based on the same inventive concept, the application also provides a driving chip, which comprises the voltage detection and processing circuit of any one of the above feature descriptions.
Compared with the prior art, the technical scheme provided by the application has the following beneficial effects:
the application provides a voltage detection and processing circuit which is used for a switching power supply circuit, and the voltage detection and processing circuit comprises an output voltage acquisition unit and a processing unit, wherein the output voltage acquisition unit is provided with a first receiving end, a second receiving end and an output end, the first receiving end is used for receiving a first correlation signal, the first correlation signal is used for representing negative terminal voltage of the switching power supply circuit, the second receiving end is used for receiving a second correlation signal, the second correlation signal is used for representing positive terminal voltage of the switching power supply circuit, the output voltage acquisition unit is used for acquiring a third correlation signal based on the first correlation signal and the second correlation signal, the output end is used for outputting the third correlation signal, and the third correlation signal is used for representing output voltage of the switching power supply. The processing unit is used for judging whether the switching power supply circuit fails or not based on the third related signal, and performing protection processing when the switching power supply circuit fails. According to the technical scheme, the voltage signal representing the output voltage of the switching power supply is obtained based on the drain voltage of the transistor, and additional chip pins and transformer winding detection are not needed, so that the functions of high-precision output voltage detection and overvoltage protection are realized. Meanwhile, the structure can be simplified, and the cost is reduced. In addition, the application can be used for different switching operation modes, including CCM (Continuous Conduction Mode ), BCM (Boundary Conduction Mode, boundary or borderline conduction mode), DCM (Discontinuous Conduction Mode ), QR (Quasi-resonance), and the like, and can also be used for different switching power supply topologies, including BUCK, BUCK-BOOST, flyback, boost, and the like. Therefore, the voltage detection and processing circuit provided by the application has high universality.
The invention also provides a voltage detection and processing method, a switching power supply circuit and a driving chip, which belong to the same invention conception as the voltage detection and processing circuit, so that the voltage detection and processing circuit has the same beneficial effects.
Drawings
FIG. 1 is a schematic diagram of a voltage detecting and processing circuit according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of voltage waveforms at each node in FIG. 1;
FIG. 3 is a schematic diagram of a circuit structure of the voltage detection and processing circuit applied to a switching power supply topology of a BUCK-BOOST architecture;
FIG. 4 is a schematic diagram of a circuit structure of the voltage detection and processing circuit applied to a switching power supply topology of a BUCK architecture;
fig. 5 is a schematic circuit diagram of the voltage detection and processing circuit applied to a Flyback switching power supply topology;
FIG. 6 is a schematic diagram of a specific structure of a voltage detecting and processing circuit according to an embodiment of the present invention;
FIG. 7 is a schematic diagram of a voltage detection and processing circuit according to another embodiment of the present invention;
FIG. 8 is a flowchart of a voltage detecting and processing method according to another embodiment of the present invention;
the device comprises a 10-voltage detection and processing circuit, an A-first receiving end, a B-second receiving end, a C-output end, an 11-first voltage reduction circuit, a 110-first follower, a 12-sample and hold circuit, a 120-switch circuit, a 121-delay circuit, a 122-pulse signal generation circuit, a 123-second follower, a 13-output voltage acquisition unit, a 130-integration unit, a 131-subtraction unit, a 14-processing unit, a 140-fault processing circuit, an R1-first resistor, an R2-second resistor, an R3-third resistor, an R4-fourth resistor, an R5-fifth resistor, an R6-sixth resistor, a C1-first capacitor, a CMP-comparator and an M1-transistor.
Detailed Description
Specific embodiments of the present invention will be described in more detail below with reference to the drawings. The advantages and features of the present invention will become more apparent from the following description. It should be noted that the drawings are in a very simplified form and are all to a non-precise scale, merely for convenience and clarity in aiding in the description of embodiments of the invention.
In the description of the present invention, it should be understood that the directions or positional relationships indicated by the terms "center", "upper", "lower", "left", "right", etc., are based on the directions or positional relationships shown in the drawings, are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present invention.
Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present invention, the meaning of "plurality" means at least two, for example, two, three, etc., unless specifically defined otherwise. "coupled" may be directly coupled or indirectly coupled.
Before describing the specific design of the voltage detection and processing circuit 10 of the present invention in detail, we will first describe the design principle of the voltage detection and processing circuit 10 of the present invention with reference to fig. 1 to 7, specifically as follows:
referring to fig. 3 to 7, the voltage detection and processing circuit 10 of the present invention is disposed in a topology structure of a switching power supply of a BUCK, a BUCK-BOOST, flyback or a Boost, and is configured to collect a voltage of a drain, the switching power supply circuit has a transistor, the voltage detection and processing circuit 10 is connected to the drain of the transistor, the voltage detection and processing circuit includes an output voltage acquisition unit 13 and a processing unit 14, the output voltage acquisition unit 13 includes a first receiving end a, a second receiving end B, and an output end C, the first receiving end a is configured to receive a first correlation signal, the first correlation signal is configured to represent a negative voltage of the switching power supply circuit, the second receiving end B is configured to receive a second correlation signal, the second correlation signal is configured to represent a positive voltage of the switching power supply circuit, the output voltage acquisition unit 13 is configured to acquire a third correlation signal based on the first correlation signal and the second correlation signal, and the output end C is configured to output the third correlation signal, and the third correlation signal is configured to represent an output voltage of the switching power supply; the processing unit 14 is configured to determine whether the switching power supply circuit fails based on the third correlation signal, and perform protection processing when the switching power supply circuit fails.
Based on the above principle, the voltage detecting and processing circuit 10 provided by the application is used for a switching power supply circuit, and the technical scheme of the application obtains a voltage signal representing the output voltage of the switching power supply based on the drain voltage of a transistor, so as to realize the functions of detecting the output voltage and protecting overvoltage. The switching power supply can be used for different switching operation modes, including CCM (Continuous Conduction Mode ), BCM (Boundary Conduction Mode, boundary or borderline conduction mode), DCM (Discontinuous Conduction Mode ), QR (Quasi-resonance), and the like, and can also be used for different switching power supply topologies, including BUCK, BUCK-BOOST, flyback, boost, and the like. Therefore, the voltage detecting and processing circuit 10 of the present application has high universality.
The specific circuit design and the resulting technical effects of the voltage detection and processing circuit 10 of the present application are described in detail below in conjunction with the specific embodiments shown in fig. 1-7.
Example 1
Referring to fig. 1, the present embodiment proposes a voltage detection and processing circuit 10 for a switching power supply circuit, where the switching power supply circuit has a transistor M1, the voltage detection and processing circuit 10 is connected to a drain of the transistor, the voltage detection and processing circuit includes an output voltage acquisition unit 13 and a processing unit 14, the output voltage acquisition unit 13 includes a first receiving end a, a second receiving end B, and an output end C, the first receiving end a is used for receiving a first correlation signal, the first correlation signal is used for characterizing a negative terminal voltage of the switching power supply circuit, the second receiving end B is used for receiving a second correlation signal, the second correlation signal is used for characterizing a positive terminal voltage of the switching power supply circuit, the output voltage acquisition unit 13 is used for acquiring a third correlation signal based on the first correlation signal and the second correlation signal, and the output end C is used for outputting the third correlation signal, and the third correlation signal is used for characterizing an output voltage of the switching power supply circuit; the processing unit 14 is configured to determine whether the switching power supply circuit fails based on the third correlation signal, and trigger a protection signal when the switching power supply circuit fails.
The difference from the prior art is that, in the voltage detecting and processing circuit 10 provided in this embodiment, for a switching power supply circuit, a first receiving terminal a obtains a first correlation signal related to a negative terminal voltage of the switching power supply circuit, a second receiving terminal B obtains a second correlation signal related to a positive terminal voltage of the switching power supply circuit, the output voltage obtaining unit 13 is configured to obtain a third correlation signal for characterizing an output voltage of the switching power supply based on the first correlation signal and the second correlation signal, and an output terminal C outputs the third correlation signal, and finally, the processing unit 14 is utilized to determine whether the switching power supply circuit has a fault, and perform a corresponding protection process when the fault occurs. According to the technical scheme, the output voltage of the switching power supply is obtained based on the drain voltage of the transistor, so that the output voltage detection and overvoltage protection functions are realized. The switching power supply can be used for different switching operation modes, including CCM (Continuous Conduction Mode ), BCM (Boundary Conduction Mode, boundary or borderline conduction mode), DCM (Discontinuous Conduction Mode ), QR (Quasi-resonance), and the like, and can also be used for different switching power supply topologies, including BUCK, BUCK-BOOST, flyback, boost, and the like. Therefore, the voltage detecting and processing circuit 10 of the present application has high universality.
Specifically, the second receiving end of the output voltage obtaining unit 13 is connected to the drain electrode of the transistor, and obtains the second correlation signal during the demagnetizing period when the transistor is turned off, and the first correlation signal and the second correlation signal can be obtained based on the drain voltage of the transistor, so that no additional voltage dividing resistor, chip pin and transformer winding detection are needed, the structure is simple, the cost is low, and the production is simplified.
Optionally, the output voltage acquisition unit 13 includes an integration unit and a subtraction unit; the integrating unit is used for carrying out integrating processing on the first related signal and outputting the first related signal to the subtracting unit; the subtracting unit is used for subtracting the output of the integrating unit and the second correlation signal and outputting the third correlation signal. It will be appreciated by those skilled in the art that the integration unit may be implemented using a low pass filter and the subtraction unit may be implemented using an operational amplifier embodiment.
In addition to the above-mentioned integrating process performed on the first correlation signal by the integrating unit and outputting the integrated signal to the subtracting unit, and then performing a subtracting process on the output of the integrating unit and the second correlation signal by the subtracting unit and outputting the third correlation signal, the third correlation signal may be obtained in other manners. For example, the positions of the subtracting unit and the integrating unit may be adjusted. Specifically, referring to fig. 6, the output voltage acquiring unit 13 includes an integrating unit 130 and a subtracting unit 131; the subtracting unit 131 is configured to perform a subtraction process on the first correlation signal and the second correlation signal, and output the subtraction result to the integrating unit. The integrating unit 130 is configured to integrate the output of the subtracting unit 131 and output the third correlation signal.
With continued reference to fig. 6, the voltage detecting and processing circuit further includes a first voltage-reducing circuit 11, one end of the first voltage-reducing circuit 11 is connected to the drain of the transistor M1, and the other end of the first voltage-reducing circuit 11 is configured to output the first related signal. Since the drain of the transistor M1 outputs the negative voltage of the switching power supply circuit, the value of the negative voltage tends to be relatively large, so that the negative voltage needs to be subjected to a step-down process when being collected, and the primary function of the first step-down circuit 11 is to convert the negative voltage into a low voltage that can be borne by the voltage detection and processing circuit 10. It can be understood that the first voltage-reducing circuit 11 may be implemented by a voltage-dividing circuit formed by resistors, or by a voltage-dividing circuit formed by MOS transistors, and many other types of structures are not described herein. In order to facilitate understanding, in the embodiment of the present invention, the voltage dividing circuit formed by the resistor through the first voltage reducing circuit 11 is implemented, and other situations are the same.
Specifically, referring to fig. 6, the first voltage-reducing circuit 11 includes a first resistor R1 and a second resistor R2. One end of the first resistor R1 is connected to the drain of the transistor M1, the other end of the first resistor R1 is connected to one end of the second resistor R2 at a first intersection point, and the other end of the second resistor R2 is grounded. The first intersection is used for outputting the first correlation signal.
Preferably, referring to fig. 6, the first step-down circuit 11 may further include a first follower 110; an input end of the first follower 110 is connected to the first intersection point, and an output end of the first follower 110 is configured to output the first correlation signal. The first follower 110 is a voltage follower, so that the voltage values of the input end and the output end of the voltage follower are constant and equal, the first voltage-reducing circuit 11 and the subsequent sampling circuit 12 or the output voltage acquisition unit 13 can be effectively isolated by using the first follower 110, and the change of the voltage value of the negative end sampled by the first voltage-reducing circuit 11 due to the abrupt change of the output or input of the sampling circuit 12 or the output voltage acquisition unit 13 is avoided, so that the anti-interference performance and the accuracy of the detection result are effectively ensured.
Referring to fig. 1, the voltage detection and processing circuit 10 may further include a sample-and-hold circuit 12, one end of the sample-and-hold circuit 12 is connected to the drain of the transistor, the other end of the sample-and-hold circuit 12 is connected to the output voltage acquisition unit 13 and outputs the second correlation signal based on the drain voltage of the transistor, specifically, the output voltage acquisition unit 13 acquires the second correlation signal during the demagnetizing period in which the transistor is turned off. The sample-and-hold circuit 12 is further connected to a drive control unit for outputting control pulse signals to the sample-and-hold circuit 12 and the transistor M1.
Specifically, referring to fig. 6, the sample-hold circuit 12 includes a switch circuit 120, a delay circuit 121, a pulse signal generating circuit 122, and a first capacitor C1. The first end of the switch circuit 120 is connected to the first receiving end a, the second end of the switch circuit 120 is connected to one end of the first capacitor C1 at a second intersection point, and the third end of the switch circuit 120 is connected to the output end of the pulse signal generating circuit 122. An input end of the pulse signal generating circuit 122 is connected to an output end of the delay circuit 121, and an input end of the delay circuit 121 is connected to the drive control unit. The other end of the first capacitor C1 is grounded, and the second intersection point is used for outputting the second correlation signal. In the embodiment of the present invention, the pulse signal generating circuit 122 may output a single pulse signal, and the pulse signal generating circuit 122 may be a single pulse signal generating circuit, for example, a signal such as a switch contact may be used to reset a digital signal, or a shutdown signal may be formed, and the single pulse signal generating circuit may be an asynchronous differential circuit. The timing of the pulse signal generating circuit 122 may be provided by the drive control unit, which is further configured to provide a drive timing signal to the transistor M1 in the switching power supply circuit, which may ensure that the signal sampled at the sample-and-hold circuit 12 is the drain voltage during the demagnetization period when the transistor M1 is turned off. The switch circuit 120 is controlled by the pulse signal generating circuit 122, the pulse signal sent by the pulse signal generating circuit 122 is used for controlling the on-off of the switch circuit 120, for example, when the pulse signal is at a high level, the switch circuit 120 is turned on, the sample hold circuit 12 finishes the sampling operation at this time, and the capacitor C1 is used for holding the sampled voltage; when the pulse signal is at a low level, the switching circuit 120 is turned off. Of course, there are many other similar situations, which are not described in detail herein, and may be selected according to actual needs, which are not limited herein. In the embodiment of the present invention, when the pulse signal is at the high level, the switch circuit 120 is turned on, and the sample-hold circuit 12 performs sampling at this time; and when the pulse signal is at a low level, the switch circuit 120 is turned off for example to specifically explain the other cases similarly.
Preferably, the input end of the sample-hold circuit 12 is connected to the first voltage-reducing circuit 11, and the first correlation signal and the second correlation signal are obtained by sharing the same voltage-reducing circuit, so that an additional voltage-dividing circuit is not required, the structure is simple, and the production is simplified.
Preferably, referring to fig. 6, the sample-and-hold circuit 12 further includes a second follower 123; an input terminal of the second follower 123 is connected to the second intersection, and an output terminal of the second follower 123 is connected to the second input terminal B and is configured to output the second correlation signal. The second follower 123 is a voltage follower, so that the voltage values of the input end and the output end of the second follower are constant and equal, and the second follower 123 can effectively isolate the sample hold circuit 12 from the subsequent output voltage acquisition unit 13, so that the influence on the sample hold circuit 12 caused by the abrupt change of the output or input of the output voltage acquisition unit 13 is avoided, and the anti-interference performance and the accuracy of the detection result are effectively ensured.
Referring to fig. 6, the output voltage obtaining unit 13 includes a third resistor R3, a fourth resistor R4, a fifth resistor R5, a sixth resistor R6, and an operational amplifier OP (i.e. the subtracting unit 131). The first input end of the operational amplifier OP is connected to one end of the third resistor R3 and one end of the fourth resistor R4, the other end of the third resistor R3 is connected to the second receiving end B to receive the second related signal, and the other end of the fourth resistor R4 is grounded. The second input end of the operational amplifier OP is connected to one end of the fifth resistor R5 and one end of the sixth resistor R6, the other end of the fifth resistor R5 is connected to the first receiving end a to receive the first related signal, and the other end of the sixth resistor R6 is connected to the output end of the operational amplifier OP. The output terminal of the operational amplifier OP is further connected to the processing unit 14 to output the third correlation signal.
With continued reference to fig. 6, the processing unit 14 includes a comparator CMP, a fault handling circuit 140; a first input terminal of the comparator CMP is configured to be connected to the output terminal C of the output voltage acquiring unit 13 to receive the third correlation signal, a second input terminal of the comparator CMP is configured to receive a threshold voltage, and an output terminal of the comparator CMP is configured to output a comparison result to the fault processing circuit 140. The fault processing circuit 140 is configured to determine whether the switching power supply circuit has a fault based on the comparison result, and perform protection processing to avoid damage to a device of the switching power supply circuit when the fault occurs. Wherein the threshold voltage is preconfigured. When the comparison result is that the third related signal exceeds the range of the threshold voltage, the comparator CMP triggers an overvoltage signal, and the fault processing circuit 140 receives the overvoltage signal and then performs validity judgment and other comprehensive judgment to determine whether the switching power supply circuit has a fault.
The protection process may include: the fault handling circuit 140 outputs a protection signal to the switching power supply circuit to turn off the switching power supply circuit or to reduce the on time or the on frequency of the switching power supply. For example, when the fault handling circuit 140 determines that the switching power supply circuit has an overvoltage fault, the fault handling circuit 140 may send a fault command to the gate of the transistor M1 in the switching power supply circuit or to the driving control unit of the transistor M1, so that the transistor M1 is turned off or the on time/frequency is reduced. It should be understood by those skilled in the art that the main function of the fault handling circuit 140 is to output a corresponding instruction based on the comparison result, so that the fault handling circuit 140 may be implemented by some logic gates, which are not limited herein, and may be specifically selected according to actual needs.
The output voltage obtaining unit may further include an integrating unit 130, and the integrating unit may be a low-pass filter circuit LPF, and it should be noted that the types of filter circuits in the low-pass filter circuit LPF include, but are not limited to, a filter circuit formed by a resistor and a capacitor, a filter circuit formed by a resistor and a inductor, and filtering is implemented only by using a capacitor, and the specific type of the filter circuit in the low-pass filter circuit LPF is not limited and may be specifically selected according to actual needs. In the embodiment of the present invention, the low-pass filter LPF may use a first-order RC low-pass filter, but is not limited to use of a first-order RC low-pass filter, and may use other types of low-pass filters, for example, a second-order RC low-pass filter, or a third-order RC low-pass filter, which is specifically selected according to practical needs. But it should be noted that the higher the order (number of elements) of the low-pass filter, the shorter the transition band thereof. Determining the transition zone may generally be performed in the following manner: the transition zone is required to be short in both cases, one being: when the frequency of the interference signal is close to the frequency of the working signal; for example, the useful signal has a frequency of 10-50MHz, the interference has a frequency of 100MHz, and the interference needs to be suppressed by 20dB (which is a lower requirement), and the order of the filter is required to be at least 4. Another case is: the interference intensity is strong, and the required inhibition amount is large; for example, if the frequency of the useful signal is 10MHz or less and the frequency of the interference is 100MHz, and it is necessary to suppress the interference by 60dB, the order of the filter is required to be at least 3.
Fig. 3 shows a circuit configuration of the voltage detection and processing circuit 10 in the present embodiment applied to a switching power supply topology of a BUCK-BOOST architecture, fig. 4 shows a circuit configuration of the voltage detection and processing circuit 10 in the present embodiment applied to a switching power supply topology of a BUCK architecture, and fig. 5 shows a circuit configuration of the voltage detection and processing circuit 10 in the present embodiment applied to a switching power supply topology of a Flyback architecture. There are many other examples of application scenarios, such as a Boost architecture, a switching power topology, etc., which are not shown here, and may be specifically selected according to actual needs.
Example two
Referring to fig. 7, the present embodiment provides a voltage detection and processing circuit 10, the switching power supply circuit has a transistor M1, the voltage detection and processing circuit 10 is connected to a drain of the transistor, the voltage detection and processing circuit includes an output voltage acquisition unit and a processing unit 14, the output voltage acquisition unit has a first receiving end a, a second receiving end B, and an output end C, the first receiving end a is used for receiving a first correlation signal, the first correlation signal is used for representing a negative terminal voltage of the switching power supply circuit, the second receiving end B is used for receiving a second correlation signal, the second correlation signal is used for representing a positive terminal voltage of the switching power supply circuit, the output voltage acquisition unit is used for acquiring a third correlation signal based on the first correlation signal and the second correlation signal, the output end C is used for outputting the third correlation signal, and the third correlation signal is used for representing an output voltage of the switching power supply; the processing unit 14 is configured to determine whether the switching power supply circuit fails based on the third correlation signal, and trigger a protection signal when the switching power supply circuit fails. The specific circuit structures and connection relationships of the first receiving terminal a, the output terminal C, and the processing unit 14 may be referred to the description in the first embodiment, and will not be described herein.
The voltage detecting and processing circuit 10 of the present embodiment is different from the voltage detecting and processing circuit 10 of the first embodiment in that, in the first embodiment, the second receiving terminal B is connected to the drain of the transistor M1, and the second correlation signal is obtained during the demagnetizing period when the transistor is turned off. In this embodiment, the second receiving terminal B is connected to the positive terminal of the switching power supply circuit, so as to obtain the positive terminal voltage of the output voltage, that is, the second related signal is obtained from a different source, and the following processing may refer to the previous embodiment.
Specifically, referring to fig. 7, the second receiving end B includes a second voltage-reducing circuit, one end of the second voltage-reducing circuit is connected to the positive end of the switching power supply circuit, and the other end of the second voltage-reducing circuit is used for outputting the second related signal. The second step-down circuit has a similar structure to the first step-down circuit 11, and is mainly used for converting the positive terminal voltage into a low voltage value that can be borne by the voltage detection and processing circuit 10. It can be understood that the second voltage-reducing circuit may be implemented by a voltage-dividing circuit formed by resistors, or by a voltage-dividing circuit formed by MOS transistors, and many other types of structures are not described herein. The first related signal in this embodiment may be obtained based on the drain voltage of the transistor, without requiring an additional chip pin and an additional transformer winding detection, and has a simple structure, low cost, and simplified production.
Example III
Referring to fig. 8, the present embodiment provides a voltage detecting and processing method for a switching power supply circuit, wherein the switching power supply includes a transistor, and the voltage detecting and processing method includes the following steps:
s1: acquiring a first related signal based on the drain voltage of the transistor, wherein the first related signal is used for representing the negative terminal voltage of the switching power supply circuit;
s2: acquiring a second related signal, wherein the second related signal is used for representing the positive terminal voltage of the switching power supply circuit;
s3: acquiring a third correlation signal based on the first correlation signal and the second correlation signal, wherein the third correlation signal is used for representing the output voltage of the switching power supply;
s4: and judging whether the switching power supply circuit fails or not based on the third related signal, and triggering a protection signal when the switching power supply circuit fails. Specifically, as can be seen from the voltage waveform diagram in fig. 2, the drain voltage of the transistor has an average value (indicated by a dotted line in the figure) equal to Vout (i.e., the difference between vout+ and Vo) in one period T, and has a value equal to vout+ during the demagnetization period in which the transistor is turned off. For the flyback frame, the proportion relation may be specifically referred to the drain voltage portion of fig. 5, so in the step S2, the second correlation signal may be obtained by sampling and holding the drain voltage of the transistor during the demagnetizing period when the transistor is turned off, based on the drain voltage of the transistor. In addition, the second related signal can be obtained by connecting the positive terminal of the switching power supply circuit, and can be specifically selected according to actual needs.
The voltage detecting and processing method provided by the embodiment is used for a switching power supply circuit, a first receiving end A firstly obtains a first related signal used for representing the negative terminal voltage of the switching power supply circuit, a second receiving end B obtains a second related signal used for representing the positive terminal voltage of the switching power supply circuit, an output voltage obtaining unit is used for obtaining a third related signal based on the first related signal and the second related signal, an output end C is used for outputting the third related signal, and finally a processing unit 14 is used for judging whether the switching power supply circuit has a fault or not and performing corresponding protection processing when the switching power supply circuit has the fault. According to the technical scheme, the voltage signal representing the output voltage of the switching power supply is obtained based on the drain voltage of the transistor, so that the output voltage detection and overvoltage protection functions are realized. The switching power supply can be used for different switching operation modes, including CCM (Continuous Conduction Mode ), BCM (Boundary Conduction Mode, boundary or borderline conduction mode), DCM (Discontinuous Conduction Mode ), QR (Quasi-resonance), and the like, and can also be used for different switching power supply topologies, including BUCK, BUCK-BOOST, flyback, boost, and the like. Therefore, the voltage detection and processing method provided by the application has high universality.
Example IV
Referring to fig. 3 to 5, the present embodiment further provides a switching power supply circuit, which includes the voltage detecting and processing circuit 10 described in any of the above features. The structure of the voltage detection and processing circuit 10 can refer to the descriptions in the first embodiment and the second embodiment, and will not be described herein.
The structure of a BUCK-BOOST switching power supply circuit is shown in fig. 3, the structure of a BUCK switching power supply circuit is shown in fig. 4, and the structure of a Flyback switching power supply circuit is shown in fig. 5. There are many other switching power supply circuit configurations, such as a Boost architecture switching power supply topology, etc., not shown here, and may be specifically selected according to actual needs.
Based on the same inventive concept, an embodiment of the present application also proposes a driving chip, including the voltage detection and processing circuit 10 described in any of the above feature descriptions.
In summary, the technical scheme provided by the application has the following beneficial effects:
the application provides a voltage detection and processing circuit which is used for a switching power supply circuit, and the voltage detection and processing circuit comprises an output voltage acquisition unit and a processing unit, wherein the output voltage acquisition unit is provided with a first receiving end, a second receiving end and an output end, the first receiving end is used for receiving a first correlation signal, the first correlation signal is used for representing negative terminal voltage of the switching power supply circuit, the second receiving end is used for receiving a second correlation signal, the second correlation signal is used for representing positive terminal voltage of the switching power supply circuit, the output voltage acquisition unit is used for acquiring a third correlation signal based on the first correlation signal and the second correlation signal, the output end is used for outputting the third correlation signal, and the third correlation signal is used for representing output voltage of the switching power supply. The processing unit is used for judging whether the switching power supply circuit fails or not based on the third related signal, and performing protection processing when the switching power supply circuit fails. According to the technical scheme, the voltage signal representing the output voltage of the switching power supply is obtained based on the drain voltage of the transistor, and additional chip pins and transformer winding detection are not needed, so that the functions of high-precision output voltage detection and overvoltage protection are realized. Meanwhile, the structure can be simplified, and the cost is reduced. In addition, the application can be used for different switching operation modes, including CCM (Continuous Conduction Mode ), BCM (Boundary Conduction Mode, boundary or borderline conduction mode), DCM (Discontinuous Conduction Mode ), QR (Quasi-resonance), and the like, and can also be used for different switching power supply topologies, including BUCK, BUCK-BOOST, flyback, boost, and the like. Therefore, the voltage detection and processing circuit provided by the application has high universality. The application also provides a voltage detection and processing method, a switching power supply circuit and a driving chip, which belong to the same application conception as the voltage detection and processing circuit, so that the voltage detection and processing circuit has the same beneficial effects.
In the description of the present specification, a description of the terms "one embodiment," "some embodiments," "examples," or "particular examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics may be combined in any suitable manner in any one or more embodiments. Further, one skilled in the art can engage and combine the different embodiments or examples described in this specification.
The foregoing is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Any person skilled in the art will make any equivalent substitution or modification to the technical solution and technical content disclosed in the invention without departing from the scope of the technical solution of the invention, and the technical solution of the invention is not departing from the scope of the invention.
Claims (14)
1. A voltage detection and processing circuit for a switching power supply circuit having a transistor, the voltage detection and processing circuit being connected to a drain of the transistor, the voltage detection and processing circuit comprising:
The output voltage acquisition unit is used for acquiring a third correlation signal based on the first correlation signal and the second correlation signal, and the output end is used for outputting the third correlation signal, and the third correlation signal is used for representing the output voltage of the switching power supply, wherein the output voltage acquisition unit enables the first correlation signal to be subjected to integral processing and then subjected to subtraction processing with the second correlation signal to obtain the third correlation signal, or enables the first correlation signal to be subjected to subtraction processing and then subjected to integral processing with the second correlation signal to obtain the third correlation signal;
and the processing unit is used for judging whether the switching power supply circuit fails or not based on the third related signal, and performing protection processing when the switching power supply circuit fails.
2. The voltage detection and processing circuit according to claim 1, wherein a second receiving terminal of the output voltage acquisition unit is connected to a drain of the transistor, and acquires the second correlation signal during demagnetization when the transistor is turned off.
3. The voltage detection and processing circuit according to claim 1, wherein the output voltage acquisition unit includes an integration unit and a subtraction unit;
the integrating unit is used for carrying out integrating processing on the first related signal and outputting the first related signal to the subtracting unit;
the subtracting unit is used for subtracting the output of the integrating unit and the second correlation signal and outputting the third correlation signal.
4. The voltage detection and processing circuit according to claim 1, wherein the output voltage acquisition unit includes an integration unit and a subtraction unit;
the subtracting unit is used for subtracting the first correlation signal and the second correlation signal and outputting the first correlation signal and the second correlation signal to the integrating unit;
the integrating unit is used for integrating the output of the subtracting unit and outputting the third correlation signal.
5. The voltage detection and processing circuit according to claim 1, wherein the voltage detection and processing circuit includes a first voltage reduction circuit having one end connected to a drain of the transistor for voltage reduction of a drain voltage of the transistor.
6. The voltage detection and processing circuit of claim 1, wherein the voltage detection and processing circuit further comprises a sample-and-hold circuit;
one end of the sample-and-hold circuit is connected with the drain electrode of the transistor, and the other end of the sample-and-hold circuit is connected with the output voltage acquisition unit and outputs the second related signal based on the drain voltage of the transistor.
7. The voltage detection and processing circuit of claim 6, wherein the sample-and-hold circuit is further coupled to a drive control unit for outputting control pulse signals to the sample-and-hold circuit and the transistor.
8. The voltage detection and processing circuit of claim 7, wherein the sample-and-hold circuit comprises a switching circuit, a delay circuit, a pulse signal generation circuit, and a first capacitor;
the first end of the switching circuit is connected with the drain electrode of the transistor, the second end of the switching circuit is connected with one end of the first capacitor at a second intersection point, and the third end of the switching circuit is connected with the output end of the pulse signal generating circuit;
the input end of the pulse signal generating circuit is connected with the output end of the delay circuit, and the input end of the delay circuit is connected with the drive control unit;
The other end of the first capacitor is grounded, and the second intersection point is used for outputting the second correlation signal.
9. The voltage detection and processing circuit of claim 1, wherein a second receiving terminal of the output voltage acquisition unit is connected to a positive terminal of the switching power supply circuit and receives the second correlation signal.
10. The voltage detection and processing circuit of claim 9, further comprising a second voltage step-down circuit, one end of the second voltage step-down circuit being configured to be connected to a positive terminal of the switching power supply circuit, and the other end of the first receiving terminal being configured to output the second correlation signal.
11. The voltage detection and processing circuit of claim 1, wherein the processing unit comprises a comparator and a fault handling circuit;
the first input end of the comparator is used for being connected with the output voltage acquisition unit to receive the third related signal, the second input end of the comparator is used for receiving a threshold voltage, and the output end of the comparator is used for outputting a comparison result to the fault processing circuit;
the fault processing circuit is used for judging whether the switching power supply circuit has faults or not based on the comparison result and triggering a protection signal when the faults occur;
Wherein the threshold voltage is preconfigured.
12. A voltage detection and processing method for a switching power supply circuit having a transistor, the voltage detection and processing method comprising the steps of:
acquiring a first related signal based on the drain voltage of the transistor, wherein the first related signal is used for representing the negative terminal voltage of the switching power supply circuit;
acquiring a second related signal, wherein the second related signal is used for representing the positive terminal voltage of the switching power supply circuit;
acquiring a third correlation signal based on the first correlation signal and the second correlation signal, wherein the third correlation signal is used for representing the output voltage of the switching power supply, and the third correlation signal is obtained by integrating the first correlation signal and then subtracting the first correlation signal from the second correlation signal, or is obtained by subtracting the first correlation signal from the second correlation signal and then integrating the first correlation signal from the second correlation signal;
and judging whether the switching power supply circuit fails or not based on the third related signal, and triggering a protection signal when the switching power supply circuit fails.
13. A switching power supply circuit comprising a voltage detection and processing circuit according to any one of claims 1-11 or utilising a voltage detection and processing method according to claim 12.
14. A driver chip comprising a voltage detection and processing circuit according to any one of claims 1-11 or using a voltage detection and processing method according to claim 12.
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101212134A (en) * | 2006-12-28 | 2008-07-02 | 华润矽威科技（上海）有限公司 | Over-voltage protection circuit for boosting-type switching power supply |
| CN103391010A (en) * | 2013-07-25 | 2013-11-13 | 深圳市明微电子股份有限公司 | Switching power supply driving chip and switching power supply driving circuit |
| CN103887770A (en) * | 2013-12-13 | 2014-06-25 | 上海新进半导体制造有限公司 | Overvoltage protective circuit in LED driving power supply without auxiliary winding |
| CN204497985U (en) * | 2015-04-13 | 2015-07-22 | 杭州士兰微电子股份有限公司 | LED drive circuit and switch power controller thereof |
| CN106941314A (en) * | 2017-03-27 | 2017-07-11 | 广东美芝精密制造有限公司 | The overvoltage crowbar of compressor control system and Switching Power Supply |
| CN111130330A (en) * | 2019-12-30 | 2020-05-08 | 杭州士兰微电子股份有限公司 | Switching power supply and control circuit and control method thereof |
-
2020
- 2020-12-30 CN CN202011611886.5A patent/CN112736851B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101212134A (en) * | 2006-12-28 | 2008-07-02 | 华润矽威科技（上海）有限公司 | Over-voltage protection circuit for boosting-type switching power supply |
| CN103391010A (en) * | 2013-07-25 | 2013-11-13 | 深圳市明微电子股份有限公司 | Switching power supply driving chip and switching power supply driving circuit |
| CN103887770A (en) * | 2013-12-13 | 2014-06-25 | 上海新进半导体制造有限公司 | Overvoltage protective circuit in LED driving power supply without auxiliary winding |
| CN204497985U (en) * | 2015-04-13 | 2015-07-22 | 杭州士兰微电子股份有限公司 | LED drive circuit and switch power controller thereof |
| CN106941314A (en) * | 2017-03-27 | 2017-07-11 | 广东美芝精密制造有限公司 | The overvoltage crowbar of compressor control system and Switching Power Supply |
| CN111130330A (en) * | 2019-12-30 | 2020-05-08 | 杭州士兰微电子股份有限公司 | Switching power supply and control circuit and control method thereof |
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