CN108418404B - Circuit capable of controlling intermittent point entering and method thereof - Google Patents
Circuit capable of controlling intermittent point entering and method thereof Download PDFInfo
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- CN108418404B CN108418404B CN201810272678.3A CN201810272678A CN108418404B CN 108418404 B CN108418404 B CN 108418404B CN 201810272678 A CN201810272678 A CN 201810272678A CN 108418404 B CN108418404 B CN 108418404B
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- 238000000034 method Methods 0.000 title claims abstract description 12
- 238000002955 isolation Methods 0.000 claims description 24
- 239000003990 capacitor Substances 0.000 claims description 10
- 230000003287 optical effect Effects 0.000 claims description 3
- 230000008878 coupling Effects 0.000 claims description 2
- 238000010168 coupling process Methods 0.000 claims description 2
- 238000005859 coupling reaction Methods 0.000 claims description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
Classifications
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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
- H02M1/092—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 the control signals being transmitted optically
-
- 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
- H02M1/36—Means for starting or stopping 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
- H02M1/0048—Circuits or arrangements for reducing losses
- H02M1/0054—Transistor switching losses
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Dc-Dc Converters (AREA)
Abstract
The invention relates to a controllable circuit for entering an intermittent point and a method thereof, wherein the circuit comprises a current setting unit, a processing unit, a frequency modulation unit and a soft start unit; the current setting unit is used for setting current according to requirements and converting a current signal into a voltage signal; the processing unit is used for receiving the voltage signal and processing the voltage signal to form an output signal; the frequency modulation unit is used for performing frequency modulation according to the voltage in the output signal; the soft start unit is used for cutting off or conducting according to the frequency modulation processing result so as to enable the control chip U3 to be turned off or started. The invention utilizes the processing unit to process the voltage signal, outputs the high-level or low-level output signal, carries out frequency modulation processing by the frequency modulation unit according to the output signal, drives the soft start unit to be conducted or cut off according to the frequency modulation result, drives the control chip U3 to be turned off or started, realizes the controllability of entering an intermittent point, enhances the reliability of a circuit, reduces the switching loss and improves the light load efficiency.
Description
Technical Field
The invention relates to a power supply, in particular to an intermittent point entering controllable circuit and a method thereof.
Background
The LED driving power supply is a power converter that converts power supply into specific voltage and current to drive the LED to emit light, and in general, the input of the LED driving power supply includes high-voltage power frequency ac (i.e., mains supply), low-voltage dc, high-voltage dc, low-voltage high-frequency ac (e.g., output of an electronic transformer), and the like; at present, the LED driving power supply in the market is increasingly miniaturized and developed, and the switching frequency is higher and higher, so that the LED driving power supply needs to be controlled to enter an intermittent state so as to ensure the service life of the LED driving power supply.
Because LLC control chips in different LED driving power supplies enter intermittent points uncontrollably, as shown in figure 1, the LLC control chips can enter intermittent operation only by reaching very high switching frequency, so that the switching loss of the MOS tube is very large, even the phenomenon of damaging the MOS tube is likely to occur, and the light load efficiency is low; hard switching is easy to occur.
Therefore, it is necessary to design a circuit with controllable entering intermittent points, so as to enhance the reliability of the circuit, reduce the switching loss and improve the light load efficiency.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a controllable circuit for entering an intermittent point and a method thereof.
In order to achieve the above purpose, the present invention adopts the following technical scheme: a controllable circuit for entering an intermittent point comprises a current setting unit, a processing unit, a frequency modulation unit and a soft start unit; the current setting unit is used for setting current according to requirements and converting a current signal into a voltage signal; the processing unit is used for receiving the voltage signal and processing the voltage signal to form an output signal; the frequency modulation unit is used for performing frequency modulation according to the voltage in the output signal; the soft start unit is used for cutting off or conducting according to the frequency modulation processing result so as to enable the control chip U3 to be turned off or started.
The further technical scheme is as follows: the soft start unit comprises a capacitor C29.
The further technical scheme is as follows: the frequency modulation unit comprises divider resistors R10, R12 and R15, a pull-up resistor R13 and triodes Q4 and Q2; when the voltage in the output signal is insufficient for the triode Q4 to be conducted, the triode Q2 is conducted, the soft starting unit is cut off, and the control chip U3 is turned off; when the voltage in the output signal is enough to be conducted by the triode Q4, the triode Q2 is cut off, the soft start unit is conducted, and the control chip U3 is started.
The further technical scheme is as follows: the current setting unit includes a voltage dividing resistor R100, a sliding resistor R52, and resistors R56, R55.
The further technical scheme is as follows: the processing unit comprises a current loop control module and an optical coupler isolation module, wherein the current loop control module is used for performing signal processing on a current signal; the optical coupling isolation module is used for conducting and cutting off according to the processing result of the current loop control module to form an output signal.
The further technical scheme is as follows: the current loop control module includes a voltage comparator U2B.
The further technical scheme is as follows: the optocoupler isolation module comprises an optocoupler isolation chip OC1.
The further technical scheme is as follows: the circuit also comprises a frequency setting unit, wherein the frequency setting unit is used for adjusting the switching frequency so as to adjust the magnitude of the set current.
The further technical scheme is as follows: the frequency setting unit includes a transistor Q14 and a voltage dividing resistor R41.
The invention also provides a control method for entering the intermittent point controllable circuit, which comprises the following steps:
setting current according to the requirement, and converting a current signal into a voltage signal;
receiving the voltage signal, and processing the voltage signal to form an output signal;
performing frequency modulation according to the voltage in the output signal;
cut-off or turn-on is performed according to the frequency modulation processing result, so that the control chip U3 is turned off or started.
Compared with the prior art, the invention has the beneficial effects that: according to the circuit capable of controlling the intermittent point, the current setting unit, the processing unit, the frequency modulation unit and the soft start unit are arranged, the processing unit is used for processing the voltage signal, the high-level or low-level output signal is output, the frequency modulation unit is used for carrying out frequency modulation processing according to the output signal, the soft start unit is driven to be conducted or cut off according to the frequency modulation result, the control chip U3 is further driven to be turned off or started, the controllability of the intermittent point is achieved, the reliability of the circuit is enhanced, the switching loss is reduced, and the light load efficiency is improved.
The invention is further described below with reference to the drawings and specific embodiments.
Drawings
FIG. 1 is a block diagram of a controllable circuit for entering an intermittent point according to an embodiment of the present invention;
fig. 2 is a schematic circuit diagram of a controllable circuit for entering an intermittent point according to an embodiment of the present invention.
Detailed Description
In order to more fully understand the technical content of the present invention, the following technical solutions of the present invention will be further described and illustrated with reference to specific embodiments, but are not limited thereto.
As shown in the specific embodiments of fig. 1 to 2, the circuit with controllable entering intermittent points provided in this embodiment can be applied to power circuits such as a switching power supply and an LED driving power supply, so as to enhance the reliability of the circuit, reduce the switching loss, and improve the light load efficiency.
As shown in fig. 1, the present embodiment provides an entry intermittent point controllable circuit, which includes a current setting unit 1, a processing unit 2, a frequency modulation unit 3, and a soft start unit 4; the current setting unit 1 is used for setting current according to requirements and converting a current signal into a voltage signal; a processing unit 2, configured to receive the voltage signal, and process the voltage signal to form an output signal; the frequency modulation unit 3 is used for performing frequency modulation according to the voltage in the output signal; and the soft start unit 4 is used for cutting off or conducting according to the frequency modulation processing result so as to enable the control chip U3 to be turned off or started.
Preferably, the soft start unit 4 includes a capacitor C29, and the capacitor C29 is connected to the driving terminal pin of the control chip U3 to drive the control chip U3 to be turned off or started normally.
In addition, for some embodiments, the frequency modulation unit 3 includes voltage dividing resistors R10, R12, R15, a pull-up resistor R13, and transistors Q4, Q2; when the voltage in the output signal is insufficient for the triode Q4 to be conducted, the triode Q2 is conducted, the soft starting unit 4 is cut off, and the control chip U3 is turned off; when the voltage in the output signal is enough to be conducted by the triode Q4, the triode Q2 is cut off, the soft start unit 4 is conducted, and the control chip U3 is started.
Specifically, for fig. 2, the voltage in the output signal is also the base voltage in transistor Q4, and the circuit is in operation divided into two states:
state one: when the voltage of the base level in the triode Q4 is less than that of the triode Q4, the base level of the triode Q2 is conducted through a pull-up R13 resistor, so that the SS pin of a control chip U3 connected with the soft start unit 4 is pulled down, the control chip U3 is further turned off, and the current is reduced to enter a second state;
state two: the processing result of the processing unit 2 is affected after the current drops, so that the base level voltage in the triode Q4 is divided by the resistors R10, R12 and R13, the triode Q4 is conducted, the voltage of the base level in the triode Q2 is also pulled down, the triode Q2 is not conducted, the soft starting unit 4 is conducted, the chip U3 is further controlled to start normally, the state I is returned, and the intermittent purpose is achieved.
The voltage is judged and selected through the frequency modulation unit 3, so that the influence on the soft start unit 4 is achieved, and then the control chip U3 is driven to be turned off or started, and the effect of controllable entering of the intermittent point is achieved.
Further, for some embodiments, the current setting unit 1 includes a voltage dividing resistor R100, a sliding resistor R52, and resistors R56, R55. The voltage signal is formed by converting the current signal through the voltage dividing resistor R100, the sliding resistor R52 and the resistors R56 and R55, so that the frequency modulation unit 3 can be driven to work subsequently.
In addition, in the above embodiment, the processing unit 2 includes the current loop control module 21 and the optocoupler isolation module 22, where the current loop control module 21 is configured to perform signal processing on a current signal; the optocoupler isolation module 22 is configured to conduct and intercept according to a processing result of the current loop control module 21, so as to form an output signal.
Preferably, the current loop control module 21 includes a voltage comparator U2B.
Preferably, the optocoupler isolation module 22 includes an optocoupler isolation chip OC1.
The current loop control module 21 further includes a bypass capacitor C32, a bypass capacitor C3, and a resistor R31 connected between the inverting input terminal and the output terminal of the voltage comparator U2B, where the bypass capacitor C3 and the resistor R31 are connected in parallel with the bypass capacitor C32, and the interference in the input signal is used as a filtering object to prevent the interference signal from returning to the power supply.
The inverting input terminal of the voltage comparator U2B is connected to capacitors C23 and C52, and the capacitors C23 and C52 are grounded to form a zero-crossing comparator circuit to determine the voltage change.
In addition, an anti-reverse diode D2 is connected between the output ends of the voltage comparator U2B and the optocoupler isolation chip OC1.
And a resistor R2 is also connected between the pin 1 and the pin 2 of the optocoupler isolation chip OC1.
In addition, in the above embodiment, the above circuit further includes a frequency setting unit 5, and the frequency setting unit 5 is used for adjusting the switching frequency to adjust the magnitude of the set current.
Specifically, the frequency setting unit 5 includes a transistor Q14 and a voltage dividing resistor R41, and the control chip U3 controls the transistor Q14 and the voltage dividing resistor R41 to adjust the switching frequency and the setting current.
As shown in fig. 2, the voltage in the output signal is also the base voltage in transistor Q4, and the circuit is in operation divided into two states:
state one: the current setting unit 1 sets that the current is smaller, the positive end voltage of the voltage comparator U2B is smaller than the negative end voltage, the voltage comparator U2B outputs a low level according to the operational amplifier characteristic, the differential pressure between the pin 1 and the pin 2 of the optocoupler isolation chip OC1 reaches the optocoupler conducting voltage through the optocoupler isolation module 22, the pin 3 and the pin 4 of the optocoupler isolation chip OC1 are conducted and correspond to the voltage dividing resistor R12 and the voltage dividing resistor R13, and the voltage dividing resistor R15 is arranged on the voltage dividing resistor, so that the base level voltage in the triode Q4 is smaller than the conduction of the triode Q4, the base level of the triode Q2 is conducted through the pull-up R3, the SS pin of the soft starting unit 4 is pulled down, the soft starting unit 4 is cut off, the driving control chip U3 is turned off, and the current is reduced to enter a second state;
state two: through the regulation of the circuit, the current drops, and then, the negative terminal voltage of the voltage comparator U2B is smaller than the positive terminal voltage, according to the operational amplifier characteristic, the output of the voltage comparator U2B is high level, the differential pressure between the pin 1 and the pin 2 of the optocoupler isolation chip OC1 does not reach the optocoupler conducting voltage, the optocoupler isolation chip OC1 is not conducted, the base level voltage in the triode Q4 is divided by the voltage dividing resistor R10, the voltage dividing R12 and the voltage dividing R13, the triode Q4 is conducted, the base level in the triode Q2 is pulled down, the triode Q2 is not conducted, the soft starting unit 4 is conducted, the driving control U3 is further started normally, the first state is entered, the intermittent purpose is achieved, the switching loss is reduced, and the light load efficiency is improved.
According to the intermittent point entering controllable circuit, the current setting unit 1, the processing unit 2, the frequency modulation unit 3 and the soft start unit 4 are arranged, the processing unit 2 is used for processing a voltage signal, a high-level or low-level output signal is output, the frequency modulation unit 3 carries out frequency modulation processing according to the output signal, the soft start unit 4 is driven to be conducted or cut off according to a frequency modulation result, and then the control chip U3 is driven to be turned off or started, so that the controllability of entering an intermittent point is realized, the reliability of the circuit is enhanced, the switching loss is reduced, and the light load efficiency is improved.
In addition, the invention also provides a control method for entering the intermittent point controllable circuit, which comprises the following steps:
setting current according to the requirement, and converting a current signal into a voltage signal;
receiving the voltage signal, and processing the voltage signal to form an output signal;
performing frequency modulation according to the voltage in the output signal;
cut-off or turn-on is performed according to the frequency modulation processing result, so that the control chip U3 is turned off or started.
Specifically, state one: the current setting unit 1 sets that the current is smaller, the positive end voltage of the voltage comparator U2B is smaller than the negative end voltage, the voltage comparator U2B outputs a low level according to the operational amplifier characteristic, the differential pressure between the pin 1 and the pin 2 of the optocoupler isolation chip OC1 reaches the optocoupler conducting voltage through the optocoupler isolation module 22, the pin 3 and the pin 4 of the optocoupler isolation chip OC1 are conducted and correspond to the voltage dividing resistor R12 and the voltage dividing resistor R13, and the voltage dividing resistor R15 is arranged on the voltage dividing resistor, so that the base level voltage in the triode Q4 is smaller than the conduction of the triode Q4, the base level of the triode Q2 is conducted through the pull-up R3, the SS pin of the soft starting unit 4 is pulled down, the soft starting unit 4 is cut off, the driving control chip U3 is turned off, and the current is reduced to enter a second state;
state two: through the regulation of the circuit, the current drops, and then, the negative terminal voltage of the voltage comparator U2B is smaller than the positive terminal voltage, according to the operational amplifier characteristic, the output of the voltage comparator U2B is high level, the voltage difference between the pin 1 and the pin 2 of the optocoupler isolation chip OC1 does not reach the optocoupler conducting voltage, the optocoupler isolation chip OC1 is not conducted, the base level voltage in the triode Q4 is divided by the voltage dividing resistor R10, the voltage dividing R12 and the voltage dividing R13, the triode Q4 is conducted, the base level in the triode Q2 is pulled down, the triode Q2 is not conducted, the soft starting unit 4 is conducted, the driving control U3 is started normally, and the first state is entered, so that the intermittent purpose is achieved.
According to the method for controlling the intermittent point, the voltage signal is processed, the high-level or low-level output signal is output, the frequency modulation processing is carried out according to the output signal, the soft start unit 4 is driven to be conducted or cut off according to the frequency modulation result, and then the control chip U3 is driven to be turned off or started, so that the controllability of the intermittent point is achieved, the reliability of a circuit is enhanced, the switching loss is reduced, and the light load efficiency is improved.
The foregoing examples are provided to further illustrate the technical contents of the present invention for the convenience of the reader, but are not intended to limit the embodiments of the present invention thereto, and any technical extension or re-creation according to the present invention is protected by the present invention. The protection scope of the invention is subject to the claims.
Claims (9)
1. The circuit capable of controlling the intermittent point entering is characterized by comprising a current setting unit, a processing unit, a frequency modulation unit and a soft start unit; the current setting unit is used for setting current according to requirements and converting a current signal into a voltage signal; the processing unit is used for receiving the voltage signal and processing the voltage signal to form an output signal; the frequency modulation unit is used for performing frequency modulation according to the voltage in the output signal; the soft start unit is used for cutting off or conducting according to the frequency modulation processing result so as to enable the control chip U3 to be turned off or started;
the frequency modulation unit comprises divider resistors R10, R12 and R15, a pull-up resistor R13 and triodes Q4 and Q2; when the voltage in the output signal is insufficient to enable the triode Q4 to be conducted, the triode Q2 is conducted, the soft starting unit is cut off, and the control chip U3 is turned off; when the voltage in the output signal is enough to make the triode Q4 conduct, the triode Q2 is cut off, the soft start unit is conducted, and the control chip U3 is started.
2. An entry point controllable circuit according to claim 1, wherein said soft start unit comprises a capacitor C29.
3. An entry point controllable circuit according to claim 1, wherein said current setting unit comprises a voltage dividing resistor R100, a sliding resistor R52, and resistors R56, R55.
4. An entry point controllable circuit according to any one of claims 1 to 3, wherein said processing unit comprises a current loop control module and an optocoupler isolation module, wherein said current loop control module is configured to perform signal processing on a current signal; the optical coupling isolation module is used for conducting and cutting off according to the processing result of the current loop control module to form an output signal.
5. An entry point controllable circuit according to claim 4, wherein said current loop control module comprises a voltage comparator U2B.
6. An entry point controllable circuit according to claim 5, wherein said optocoupler isolation module comprises an optocoupler isolation chip OC1.
7. The entry point controllable circuit of claim 4, further comprising a frequency setting unit for adjusting a switching frequency to adjust a magnitude of the set current.
8. An entry point controllable circuit according to claim 7, wherein said frequency setting unit comprises a transistor Q14 and a voltage dividing resistor R41.
9. A control method of an entry point controllable circuit according to any one of claims 1 to 8, characterized in that the method comprises:
setting current according to the requirement, and converting a current signal into a voltage signal;
receiving the voltage signal, and processing the voltage signal to form an output signal;
performing frequency modulation according to the voltage in the output signal;
cut-off or turn-on is performed according to the frequency modulation processing result, so that the control chip U3 is turned off or started.
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| CN201810272678.3A CN108418404B (en) | 2018-03-29 | 2018-03-29 | Circuit capable of controlling intermittent point entering and method thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810272678.3A CN108418404B (en) | 2018-03-29 | 2018-03-29 | Circuit capable of controlling intermittent point entering and method thereof |
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| CN108418404B true CN108418404B (en) | 2024-01-30 |
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| CN108418404A (en) | 2018-08-17 |
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