CN114362505A - Control circuit, power supply device and electronic equipment - Google Patents
Control circuit, power supply device and electronic equipment Download PDFInfo
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- CN114362505A CN114362505A CN202210050804.7A CN202210050804A CN114362505A CN 114362505 A CN114362505 A CN 114362505A CN 202210050804 A CN202210050804 A CN 202210050804A CN 114362505 A CN114362505 A CN 114362505A
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- 238000010586 diagram Methods 0.000 description 12
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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
- H02M1/38—Means for preventing simultaneous conduction of switches
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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
- H02M1/08—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters
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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
- H02M1/08—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters
- H02M1/088—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters for the simultaneous control of series or parallel connected semiconductor devices
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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
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Abstract
An embodiment of the present invention provides a control circuit, a power supply device, and an electronic apparatus, where the control circuit includes: the detection module is used for detecting the relation between the voltage ringing area of the target switch element and a threshold value and outputting an enable signal; and the logic module is used for responding to the enable signal and controlling the target switch element to switch the working state. The detection module and the logic module work cooperatively, so that the secondary side of the transformer can be ensured to be conducted only when the primary side of the transformer is conducted; the switching working state of the target switch element is controlled by detecting the relation between the voltage ringing area of the target switch element and the threshold value, so that the target switch element can be prevented from being switched on by mistake due to ringing.
Description
Technical Field
The invention relates to the technical field of control, in particular to a control circuit, a power supply device and electronic equipment.
Background
In the synchronous rectification chip, after the secondary side switch tube is closed, two sides of the secondary side switch tube can generate ringing, the voltage ringing is related to the inductance, parasitic inductance and capacitance, output voltage and load, when the ringing touches the switch tube opening threshold value, the synchronous rectification switch tube can be mistakenly opened, the crossover phenomenon (the primary side switch tube and the secondary side switch tube are simultaneously conducted, so that the current of the switch tube is rapidly increased) is generated, light persons generate extra chip loss, and heavy persons burn the chip.
Disclosure of Invention
The invention aims to provide a control circuit, a power supply device and an electronic device, which can prevent a target switch element from being turned on by mistake.
In order to achieve the above purpose, the embodiment of the present invention adopts the following technical solutions:
in a first aspect, an embodiment of the present invention provides a control circuit, including:
the detection module is used for detecting the relation between the voltage ringing area of the target switch element and a threshold value and outputting an enable signal;
and the logic module is used for responding to the enabling signal and controlling the target switch element to switch the working state.
Further, the detection module includes:
the state detection unit is used for detecting the real-time voltage of the target switch element and outputting a first enabling signal, and when the real-time voltage is increased or decreased, the first enabling signal is turned over once;
and the comparison unit is controlled by the first enabling signal and outputs a second enabling signal when the voltage ringing area meets a threshold value.
Further, the state detection unit comprises a delay subunit and a first comparator;
the delay subunit is used for performing delay processing on the real-time voltage to obtain and output a delay voltage;
the first comparator is used for outputting the first enabling signal according to the real-time voltage and the delay voltage.
Further, the comparison unit includes:
the voltage-current conversion subunit is used for converting the real-time voltage into current and inputting the current to the integrating subunit;
the integrating subunit is configured to calculate the voltage ringing area according to the current and the first enable signal, and output the second enable signal when the voltage ringing area is greater than the threshold.
Further, the delay subunit includes a resistor and a capacitor, the target switch element is electrically connected to one end of the resistor and the first input end of the first comparator, one end of the capacitor is connected to the other end of the resistor and the second input end of the first comparator, and the other end of the capacitor is grounded.
Further, the voltage-current conversion subunit adopts a voltage-controlled current source, the real-time voltage is input to an input end of the voltage-controlled current source, and the current is output from an output end of the voltage-controlled current source.
Further, the integrator unit or the timer subunit uses a timer or an integrator, the current is input to a first input terminal of the timer or a first input terminal of the integrator, the threshold is input to a second input terminal of the timer or a second input terminal of the integrator, the first enable signal is input to an enable control terminal of the timer or an enable control terminal of the integrator, and the second enable signal is output to an output terminal of the timer or an output terminal of the integrator.
Further, the logic unit includes:
the second comparator is controlled by the enabling signal and outputs a control signal according to the relation between the real-time voltage of the target switching element and the threshold voltage;
and the control unit is used for receiving the control signal and outputting a control instruction of the target switch element.
In a second aspect, an embodiment of the present invention further provides a power supply apparatus, including a target switching element, a transformer, and the control circuit according to the first aspect, wherein the target switching element is disposed on a secondary side of the transformer, and the target switching element is electrically connected to the control circuit.
In a third aspect, an embodiment of the present invention further provides an electronic device, including the power supply apparatus according to the second aspect.
The control circuit, the power supply device and the electronic equipment provided by the embodiment of the invention have the beneficial effects that: the control circuit includes: the detection module is used for detecting the relation between the voltage ringing area of the target switch element and a threshold value and outputting an enable signal; and the logic module is used for responding to the enable signal and controlling the target switch element to switch the working state. The detection module and the logic module work cooperatively, so that the alternate conduction of the primary side and the secondary side of the transformer can be ensured; the relation between the voltage ringing area of the target switch element and the threshold value is used for controlling the target switch element to switch the working state, so that the target switch element can be prevented from being switched on by mistake due to ringing.
In order to make the aforementioned and other objects, features and advantages of the present invention comprehensible, preferred embodiments accompanied with figures are described in detail below.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.
Fig. 1 is a schematic structural diagram of a power supply apparatus according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of an electronic device according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of a control circuit according to an embodiment of the present invention;
FIG. 4 is a schematic diagram of another control circuit according to an embodiment of the present invention;
FIG. 5 is a schematic diagram of a control circuit according to another embodiment of the present invention;
FIG. 6 is a schematic diagram of a control circuit according to another embodiment of the present invention;
FIG. 7 is a circuit schematic diagram of a control circuit according to an embodiment of the present invention;
fig. 8 shows a waveform diagram of a control circuit according to an embodiment of the present invention.
Reference numerals: 10-an electronic device; 100-a power supply device; 110-a control circuit; 111-a detection module; 1111-a state detection unit; 1112-a comparison unit; 1113-delay subunit; 1114 — a first comparator; 1115-a voltage-to-current conversion subunit; 1116-an integrating subunit; 112-a logic module; 1121 — a second comparator; 1122-a control unit; 120-target switching element; 130-a transformer; 200-load; r1-resistance; c1-capacitance.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations. Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present invention without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures. Meanwhile, in the description of the present invention, the terms "first", "second", and the like are used only for distinguishing the description, and are not to be construed as indicating or implying relative importance.
Referring to fig. 1, a schematic structural diagram of a power supply apparatus 100 according to an embodiment of the present disclosure is shown, where the power supply apparatus 100 includes a target switch element 120, a transformer 130, and a control circuit 110, the target switch element 120 is disposed on a secondary side of the transformer 130, and the target switch element 120 is electrically connected to the control circuit 110.
The control circuit 110 is configured to control the target switching element 120 to be in a conducting state when the primary side of the transformer 130 is conducting; when the primary side of the transformer 130 is not conducted, the primary side is in an off state; it is possible to prevent the target switching element 120 from being turned on erroneously due to a ringing phenomenon.
Referring to fig. 2, a schematic structural diagram of an electronic device 10 according to an embodiment of the present disclosure is shown, where the electronic device 10 includes the power supply apparatus 100 shown in fig. 1, and the power supply apparatus 100 is used for supplying power to a load 200 of the electronic device 10.
Among them, the electronic device 10 may be a power supply device, a display driving device, and the like.
Referring to fig. 3, a schematic diagram of a structure of the control circuit 110 shown in fig. 1 is shown, where the control circuit 110 includes: a detection module 111, configured to detect a relationship between a voltage ringing area of the target switch element 120 and a threshold and output an enable signal; the logic module 112 controls the target switching element 120 to switch the operating state in response to the enable signal.
In the present embodiment, the voltage ringing area may be understood as an average value calculated when the voltage of the target switching element 120 is in a fluctuation period. The threshold value can be confirmed by the area formed by the voltage when the target switching element 120 is normally turned on, and the normal turning on of the target switching element 120 can be understood as: when the primary side of the transformer 130 is conducted, the target switching element 120 is normally conducted; if the primary side of the transformer 130 is not conducted, the target switching element 120 is conducted abnormally. The threshold value can be a specific numerical value or a range value; the threshold may be a value between a limit value at which the target switching element 120 is normally turned on and a limit value at which the target switching element 120 is turned off; for example, if the limit value of the target switching element 120 for normal on is 3V and the limit value of the target switching element 120 for off is 1V, the threshold value may be a value between more than 1V and less than or equal to 3V, such as 2V, 2.5V, or 3V.
Because the threshold is set to ensure that the voltage ringing generated by the target switching element 120 cannot exceed the threshold after the primary side of the transformer 130 is turned off, the logic module 112 controls the target switching element 120 to be in the off state under the condition that the voltage ringing generated by the target switching element 120 does not exceed the threshold, thereby ensuring that the target switching element 120 is not turned on by mistake. It is understood that the threshold value is confirmed by an area formed by a voltage when the target switching element 120 is normally turned on. When the primary side of the transformer 130 is not conducted, the voltage ringing area generated by the target switch tube is always smaller than the area formed by the voltage of the target switch tube when the primary side of the transformer 130 is conducted.
Therefore, the detection module 111 and the logic module 112 work cooperatively, so that the alternate conduction of the primary side and the secondary side of the transformer 130 can be ensured; by controlling the switching of the target switching element 120 to the operating state based on the relationship between the voltage ringing area of the target switching element 120 and the threshold value, the target switching element 120 can be prevented from being erroneously turned on due to ringing.
It should be understood that the detection module 111 is connected to the logic module 112, and the detection module 111 and the logic module 112 are also used to connect to the target switch element 120. In a case where the detection module 111 needs to detect the voltage ringing area of the target switch element 120, the detection module 111 is connected to the target switch element 120, and in a case where the logic module 112 controls the target switch element 120 to switch the operating state, the logic module 112 is connected to the target switch element 120. In the case where the detection module 111 and the logic module 112 are not in the operating state, the detection module 111 and the logic module 112 may be in a disconnected state from the target switching element 120. That is, the control circuit 110 may be designed as a separate module, and the control circuit 110 is disconnected from the target switching element 120 in case of non-operation or non-assembly.
Referring to fig. 4, a schematic structural diagram of the detection module 111 shown in fig. 3 is shown, where the detection module 111 includes: a state detection unit 1111 for detecting a real-time voltage of the target switching element 120 and outputting a first enable signal, which is inverted once when the real-time voltage increases or decreases; the comparing unit 1112 is controlled by the first enable signal, and outputs a second enable signal when the voltage ringing area satisfies the threshold.
It should be understood that the state detection unit 1111 is connected to the comparison unit 1112, and the comparison unit 1112 is connected to the logic module 112; in the case where the detection module 111 needs to detect the voltage ringing area of the target switching element 120, the state detection unit 1111 is in a connected state with the target switching element 120.
When the state detection unit 1111 detects that the real-time voltage of the target switching element 120 increases, the first enable signal may be output at a high level; when the state detection unit 1111 detects that the real-time voltage of the target switching element 120 decreases, the first enable signal may be output at a low level. That is, the first enable signal inversion indicates that the first enable signal in the case of the real-time voltage increase is at an opposite logic level than the first enable signal in the case of the real-time voltage decrease.
Referring to fig. 5, the state detection unit 1111 includes a delay sub-unit 1113 and a first comparator 1114; the delay subunit 1113 is configured to perform delay processing on the real-time voltage to obtain and output a delay voltage; the first comparator 1114 is configured to output a first enable signal according to the real-time voltage and the delay voltage.
The delay subunit 1113 is connected to the first comparator 1114, and the first comparator 1114 is connected to the comparing unit 1112; the delay sub-unit 1113 and the first comparator 1114 are in a connected state with the target switching element 120 in case of detecting the voltage ringing area of the target switching element 120.
It is to be understood that the second input of the first comparator 1114 may be connected to the target switching element 120, the first input of the first comparator 1114 is connected to the delay sub-unit 1113, and the output of the first comparator 1114 is connected to the comparing unit 1112.
The second input terminal of the first comparator 1114 receives the real-time voltage of the target switch element 120, the first input terminal of the first comparator 1114 receives the delay voltage generated by the delay sub-unit 1113, and the first comparator 1114 compares the real-time voltage with the delay voltage to obtain a first enable signal. Due to the hysteresis of the delay sub-unit 1113, the generated delay voltage is equivalent to the voltage generated at the last moment of the target switch element 120, i.e. the delay voltage is the voltage at the last moment of the real-time voltage. If the real-time voltage is greater than the delay voltage, the real-time voltage is increased; if the real-time voltage is smaller than the delay voltage, the real-time voltage is reduced.
The comparing unit 1112 determines whether the comparing unit 1112 is in an operating state according to the first enable signal, that is, the comparing unit 1112 can be controlled to be in the operating state by the first enable signal generated when the real-time voltage increases, and the comparing unit 1112 can be controlled to be in the non-operating state by the first enable signal generated when the real-time voltage decreases. When the comparing unit 1112 is in the operating state, the voltage ringing area is calculated and compared with the threshold, and when the voltage ringing area satisfies the threshold, the second enable signal is output to the logic module 112.
Referring to fig. 6, the comparing unit 1112 includes: a voltage-current conversion subunit 1115 for converting the real-time voltage into a current and inputting the current to the integrating subunit 1116; and an integrating unit 1116 for calculating a voltage ringing area according to the current and the first enable signal, and outputting a second enable signal when the voltage ringing area is greater than a threshold value.
It is to be understood that in the case where it is necessary to detect the voltage ringing area of the target switching element 120, the voltage-current converting subunit 1115 is connected to the target switching element 120; the voltage-to-current conversion subunit 1115 is further connected to the integrating subunit 1116, and the integrating subunit 1116 is further connected to the first comparator 1114 and the logic block 112.
The voltage-current converting subunit 1115 may adopt a voltage-controlled current source, an input end of the voltage-controlled current source is used for being connected with the target switch element 120, and an output end of the voltage-controlled current source is connected with the integrating subunit 1116; the input end of the voltage-controlled current source inputs the real-time voltage, and the output end of the voltage-controlled current source outputs the current, that is, the voltage-controlled current source generates the corresponding current by always detecting the real-time voltage of the target switch element 120.
The integrating subunit 1116 may be a timer or an integrator, a first input terminal of the timer or a first input terminal of the integrator inputs a current, a second input terminal of the timer or a second input terminal of the integrator inputs a threshold, an enable control terminal of the timer or an enable control terminal of the integrator inputs a first enable signal, and an output terminal of the timer or an output terminal of the integrator outputs a second enable signal. Namely, the timer or the integrator performs integral calculation according to the current and the first enabling signal to obtain the voltage ringing area. The magnitude of the current controls the timing speed of the timer or the integration speed of the integrator, and the first enable signal controls the timing speed or the on-time of the integrator.
Referring to fig. 7, in order to illustrate an implementation of the control circuit 110, the delay unit 1113 includes a resistor R1 and a capacitor C1, the target switch element 120 is electrically connected to one end of the resistor R1 and the first input terminal of the first comparator 1114, one end of the capacitor C1 is connected to the other end of the resistor R1 and the second input terminal of the first comparator 1114, and the other end of the capacitor C1 is grounded.
It should be appreciated that the real-time voltage of the target switch element 120 may be delayed by the hysteresis of the capacitor C1 to generate a delayed voltage.
Referring to fig. 7, the logic unit includes: a second comparator 1121 controlled by an enable signal and outputting a control signal according to the relationship between the real-time voltage of the target switching element 120 and the threshold voltage; the control unit 1122 is configured to receive the control signal and output a control command of the target switch element 120.
It should be understood that a first input terminal of the second comparator 1121 is connected to the integrating subunit 1116, a second input terminal of the second comparator 1121 is used for being connected to the target switching element 120, an output terminal of the second comparator 1121 is connected to an input terminal of the control unit 1122, and an output terminal of the control unit 1122 is used for being connected to the target switching element 120.
The second comparator 1121 receives the second enable signal generated by the integrating unit 1116 through a first input terminal thereof, the second comparator 1121 receives the real-time voltage of the target switching element 120 through a second input terminal thereof, and the second comparator 1121 outputs a control signal to the control unit 1122 through an output terminal thereof.
In the present embodiment, the threshold voltage is determined according to the turn-on threshold of the target switching element 120; the second comparator 1121 is in an operating state under the control of the second enable signal, and when the second comparator 1121 is in the operating state, the real-time voltage of the target switch element 120 is compared with the threshold voltage, and if the real-time voltage is greater than or equal to the threshold voltage, a first control signal is output, and the control unit 1122 generates a control instruction for controlling the target switch element 120 to switch to the on state according to the first control signal; if the real-time voltage is smaller than the threshold voltage, a second control signal is output, and the control unit 1122 generates a control command for controlling the switching of the target switching element 120 to the off state according to the second control signal.
For a clearer understanding of the operation principle of the control circuit 110, the description will be given with reference to fig. 8. Vds in fig. 8 represents a real-time voltage of the target switching element 120, I _ Vds represents a current, EN _ CNT represents a first enable signal, vref represents a threshold value, timer _ ready represents a second enable signal, SR _ ON represents a control signal, gate _ ON represents a control command, and gate _ off represents a reset signal.
In this embodiment, the target switching element 120 may be a switching transistor, such as a MOS transistor. The real-time voltage Vds is the voltage between the drain and the source of the switch tube, and the control command gate _ ON is provided to the gate of the switch tube.
When the control circuit 110 needs to detect the voltage ringing area of the target switch element 120, the delay subunit 1113 obtains the real-time voltage Vds, performs delay processing on the real-time voltage Vds to obtain a delay voltage, and provides the delay voltage to the second input end of the first comparator 1114; a first input end of the first comparator 1114 obtains a real-time voltage Vds, and compares the real-time voltage Vds with a delay voltage to obtain a first enable signal EN _ CNT; when the real-time voltage Vds is greater than the delay voltage, outputting a first enable signal EN _ CNT at a high level under the condition that the real-time voltage Vds is increased; when the real-time voltage Vds is smaller than the delay voltage, the real-time voltage Vds is reduced, and a first enable signal EN _ CNT with a low level is output; the integrating subunit 1116 is in a working state when the first enable signal EN _ CNT is at a high level, the integrating subunit 1116 performs an integration calculation on the current I _ vds generated by the voltage-current converting subunit 1115 and the first enable signal EN _ CNT to obtain a voltage ringing area, compares the voltage ringing area with a preset threshold vref, and outputs a second enable signal timer _ ready when the voltage ringing area is greater than the threshold vref; the current I _ Vds generated by the voltage-to-current conversion subunit 1115 is generated from the real-time voltage Vds. The second comparator 1121 is in an operating state under the control of the second enable signal timer _ ready, and when the second comparator 1121 is in the operating state, compares the real-time voltage Vds of the target switch element 120 with the threshold voltage, and outputs a first control signal SR _ ON (the first control signal SR _ ON at this time is at a high level) if the real-time voltage Vds is greater than or equal to the threshold voltage, and the control unit 1122 generates a control command gate _ ON for controlling the target switch element 120 to switch to the ON state according to the first control signal SR _ ON (the control command gate _ ON at this time is at a high level); if the real-time voltage Vds is smaller than the threshold voltage, the second control signal SR _ ON is output (the second control signal SR _ ON is at a low level at this time), and the control unit 1122 generates the control command gate _ ON for controlling the target switching element 120 to switch to the off state according to the second control signal SR _ ON (the control command gate _ ON is at a low level at this time).
In the present embodiment, the integrating sub-unit 1116 and the control unit 1122 both have a reset function, and when the integrating sub-unit 1116 and the control unit 1122 receive a reset signal gate _ off, reset processing is performed to restart the detection of the turn-on condition of the next target switching element 120. The integrating unit 1116 receives the reset signal gate _ off to be in the off state, and the control unit 1122 receives the reset signal gate _ off to control the target switching element 120 to be in the off state. Wherein the reset signal gate _ off is generated when the target switching element 120 reaches the off condition.
In summary, an embodiment of the present invention provides a control circuit, a power supply device, and an electronic apparatus, where the control circuit includes: the detection module is used for detecting the relation between the voltage ringing area of the target switch element and a threshold value and outputting an enable signal; and the logic module is used for responding to the enable signal and controlling the target switch element to switch the working state. Through the cooperation of the detection module and the logic module, the primary side of the transformer 130 can be ensured to be conducted, and the secondary side of the transformer 130 is ensured to be conducted; the relation between the voltage ringing area of the target switch element and the threshold value is used for controlling the target switch element to switch the working state, so that the target switch element can be prevented from being switched on by mistake due to ringing.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention. It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.
Claims (10)
1. A control circuit, comprising:
the detection module is used for detecting the relation between the voltage ringing area of the target switch element and a threshold value and outputting an enable signal;
and the logic module is used for responding to the enabling signal and controlling the target switch element to switch the working state.
2. The control circuit of claim 1, wherein the detection module comprises:
the state detection unit is used for detecting the real-time voltage of the target switch element and outputting a first enabling signal, and when the real-time voltage is increased or decreased, the first enabling signal is turned over once;
and the comparison unit is controlled by the first enabling signal and outputs a second enabling signal when the voltage ringing area meets a threshold value.
3. The control circuit of claim 2, wherein the state detection unit includes a delay subunit and a first comparator;
the delay subunit is used for performing delay processing on the real-time voltage to obtain and output a delay voltage;
the first comparator is used for outputting the first enabling signal according to the real-time voltage and the delay voltage.
4. The control circuit of claim 2, wherein the comparison unit comprises:
the voltage-current conversion subunit is used for converting the real-time voltage into current and inputting the current to the integrating subunit;
the integrating subunit is configured to calculate the voltage ringing area according to the current and the first enable signal, and output the second enable signal when the voltage ringing area is greater than the threshold.
5. The control circuit of claim 3, wherein the delay subunit includes a resistor and a capacitor, the target switch element is connected to one end of the resistor and the first input terminal of the first comparator, one end of the capacitor is connected to the other end of the resistor and the second input terminal of the first comparator, and the other end of the capacitor is connected to ground.
6. The control circuit of claim 4, wherein the voltage-to-current converting subunit employs a voltage-controlled current source, an input terminal of the voltage-controlled current source inputs the real-time voltage, and an output terminal of the voltage-controlled current source outputs the current.
7. The control circuit of claim 4, wherein the integrator unit is a timer or an integrator, a first input terminal of the timer or a first input terminal of the integrator inputs the current, a second input terminal of the timer or a second input terminal of the integrator inputs the threshold, an enable control terminal of the timer or an enable control terminal of the integrator inputs the first enable signal, and an output terminal of the timer or an output terminal of the integrator outputs the second enable signal.
8. The control circuit of claim 1, wherein the logic unit comprises:
the second comparator is controlled by the enabling signal and outputs a control signal according to the relation between the real-time voltage ringing area of the target switch element and the threshold voltage;
and the control unit is used for receiving the control signal and outputting a control instruction of the target switch element.
9. A power supply apparatus comprising a target switching element, a transformer, and the control circuit according to any one of claims 1 to 8, the target switching element being provided on a secondary side of the transformer, the target switching element being electrically connected to the control circuit.
10. An electronic device characterized by comprising the power supply apparatus according to claim 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210050804.7A CN114362505A (en) | 2022-01-17 | 2022-01-17 | Control circuit, power supply device and electronic equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202210050804.7A CN114362505A (en) | 2022-01-17 | 2022-01-17 | Control circuit, power supply device and electronic equipment |
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| CN114362505A true CN114362505A (en) | 2022-04-15 |
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| Application Number | Title | Priority Date | Filing Date |
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Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4599494A (en) * | 1984-10-10 | 1986-07-08 | Motorola, Inc. | Ring sense telephone tone ringer circuit |
| JP2008147786A (en) * | 2006-12-06 | 2008-06-26 | Denso Corp | Driving circuit of insulated gate transistor |
| GB201011081D0 (en) * | 2010-07-01 | 2010-08-18 | Macfarlane Alistair | Improved semi resonant switching regulator, power factor control and LED lighting |
| DE102015108822A1 (en) * | 2014-06-03 | 2015-12-03 | Infineon Technologies Ag | System and method for current sensing in a switched mode power supply |
| US20170033698A1 (en) * | 2015-07-31 | 2017-02-02 | Texas Instruments Incorporated | Flyback converter with secondary side regulation |
| US20210242783A1 (en) * | 2020-01-31 | 2021-08-05 | Dialog Semiconductor Inc. | System and method for determining a primary switching event in an isolated converter |
| US20210257922A1 (en) * | 2020-02-18 | 2021-08-19 | Infineon Technologies Austria Ag | Reliable communication through a flyback power transformer using a zero voltage switching pulse |
| US20210367512A1 (en) * | 2020-05-19 | 2021-11-25 | Qualcomm Incorporated | Adaptive Switch Driving |
-
2022
- 2022-01-17 CN CN202210050804.7A patent/CN114362505A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4599494A (en) * | 1984-10-10 | 1986-07-08 | Motorola, Inc. | Ring sense telephone tone ringer circuit |
| JP2008147786A (en) * | 2006-12-06 | 2008-06-26 | Denso Corp | Driving circuit of insulated gate transistor |
| GB201011081D0 (en) * | 2010-07-01 | 2010-08-18 | Macfarlane Alistair | Improved semi resonant switching regulator, power factor control and LED lighting |
| DE102015108822A1 (en) * | 2014-06-03 | 2015-12-03 | Infineon Technologies Ag | System and method for current sensing in a switched mode power supply |
| US20170033698A1 (en) * | 2015-07-31 | 2017-02-02 | Texas Instruments Incorporated | Flyback converter with secondary side regulation |
| US20210242783A1 (en) * | 2020-01-31 | 2021-08-05 | Dialog Semiconductor Inc. | System and method for determining a primary switching event in an isolated converter |
| US20210257922A1 (en) * | 2020-02-18 | 2021-08-19 | Infineon Technologies Austria Ag | Reliable communication through a flyback power transformer using a zero voltage switching pulse |
| US20210367512A1 (en) * | 2020-05-19 | 2021-11-25 | Qualcomm Incorporated | Adaptive Switch Driving |
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