CN107086798B - Switching power supply circuit - Google Patents
Switching power supply circuit Download PDFInfo
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- CN107086798B CN107086798B CN201710203822.3A CN201710203822A CN107086798B CN 107086798 B CN107086798 B CN 107086798B CN 201710203822 A CN201710203822 A CN 201710203822A CN 107086798 B CN107086798 B CN 107086798B
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- 238000012937 correction Methods 0.000 claims abstract description 14
- 239000003990 capacitor Substances 0.000 claims description 103
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- 230000003750 conditioning effect Effects 0.000 claims description 10
- 238000007599 discharging Methods 0.000 claims description 5
- 102100024452 DNA-directed RNA polymerase III subunit RPC1 Human genes 0.000 claims description 2
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- 101000844751 Metallosphaera cuprina (strain Ar-4) DNA-binding protein 7 Proteins 0.000 description 17
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- 238000006243 chemical reaction Methods 0.000 description 1
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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
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/02—Conversion of ac power input into dc power output without possibility of reversal
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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
- H02M1/12—Arrangements for reducing harmonics from ac input or output
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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
- H02M1/42—Circuits or arrangements for compensating for or adjusting power factor in converters or inverters
- H02M1/4208—Arrangements for improving power factor of AC input
- H02M1/4225—Arrangements for improving power factor of AC input using a non-isolated boost converter
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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
- H02M1/12—Arrangements for reducing harmonics from ac input or output
- H02M1/123—Suppression of common mode voltage or current
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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)
- Rectifiers (AREA)
Abstract
The invention discloses a switching power supply circuit, which comprises a main power grid, an EMI filter and a rectifier bridge, wherein the output end of the main power grid is connected with the input end of the EMI filter, and the output end of the EMI filter is connected with the input end of the rectifier bridge, and the switching power supply circuit is characterized in that: the power factor correction module is connected with the load after passing through the isolation DC/DC module and the adjustable DC/DC module in sequence, the first acquisition module acquires output voltage data of the isolation DC/DC module, and the second acquisition module acquires voltage and current data output by the adjustable DC/DC module; the output end of the first acquisition module and the output end of the second acquisition module are both connected with the input end of the MCU, and the output ends of the MCU respectively control the output voltages of the isolation DC/DC module and the adjustable DC/DC module through the control circuit.
Description
Technical Field
The invention belongs to the field of circuit control, and particularly relates to a switching power supply circuit.
Background
At present, with the development of power electronics technology, great importance is paid to a power supply circuit as a heart of electronic equipment, and particularly, a switching power supply with high-efficiency energy-saving performance is provided. The switching power supply is typically composed of an input rectifying filter, a power switching tube, an output rectifying filter and a controller 4, which functions to convert an input ac voltage into a dc output voltage. The switch power supply is mainly developed to intelligent, high-frequency and miniaturized in order to meet the development requirements of modern electronic equipment, and especially the miniaturization of a small-power switch power supply.
The switching power supply is provided with a single direct current rectifying circuit in each user equipment, the rectifying circuits of each device are different in quality, the influence on a large circuit is different, and particularly, the harmonic suppression is realized. The reason why separate rectifying circuits are required for each device is that the requirements for direct current in the internal circuits of the devices are different, resulting in the need to separately design the respective rectifying circuits, which also increases the cost of the switching power supply. In view of this, it is important to design a multi-feedback switching power supply circuit with low cost and wide output range.
Disclosure of Invention
The present invention aims to solve at least one of the technical problems existing in the prior art. Therefore, the invention provides a switching power supply circuit, which aims to improve the direct current output range of a switching power supply and has a safety protection function and a harmonic suppression function.
In order to achieve the above purpose, the technical scheme adopted by the invention is as follows:
the utility model provides a switching power supply circuit, includes main electric wire netting, EMI wave filter, rectifier bridge, the EMI wave filter input is connected to main electric wire netting output, the input of rectifier bridge, its characterized in that are connected to the output of EMI wave filter: the system also comprises an isolation DC/DC module, an adjustable DC/DC module, an MCU, a first acquisition module, a second acquisition module and a control circuit, wherein the first acquisition module acquires output voltage data of the isolation DC/DC module, and the second acquisition module acquires voltage and current data output by the adjustable DC/DC module; the output end of the first acquisition module and the output end of the second acquisition module are both connected with the input end of the MCU, and the output ends of the MCU respectively control the output voltages of the isolation DC/DC module and the adjustable DC/DC module through the control circuit.
The MCU is respectively connected with the isolation DC/DC module and the adjustable DC/DC module through the first enabling circuit and the second enabling circuit.
Preferably, the control circuit is implemented using NCP 1397B.
The switching power supply circuit also comprises a signal conditioning circuit, wherein the input end of the signal conditioning circuit is connected with a main power grid, and the output end of the signal conditioning circuit is connected with the input end of the MCU.
And the input end of the MCU is provided with a clamping protection circuit which is used for limiting the voltage value of the input port of the MCU.
The EMI filter circuit comprises a capacitor C140, a capacitor C146, a capacitor C142, a common-mode inductor L15, a capacitor C150, a capacitor C151 and a capacitor C139, wherein a main power grid output signal is sequentially connected in series through the capacitor C140 and the capacitor C146 to form a common-mode interference suppression circuit, and the common-mode interference suppression circuit is formed by the differential-mode interference suppression capacitor C142, the common-mode inductor L15, the differential-mode interference suppression capacitor C142, the capacitor C139 and the capacitor C151 and then output.
The power factor correction module comprises a switch tube Q17, a follow current diode VD2 and a control chip, wherein the control chip adopts an NPC1654, two output ends of a rectifier bridge are connected with a capacitor C144 in parallel, one end of the capacitor C144 is connected with a source electrode of the Q17, the other end of the capacitor C144 is connected with a drain electrode of the Q17 through an inductor, a grid electrode of the Q17 is connected with a DRV pin of the control chip, the source electrode of the Q17 is grounded, the drain electrode of the Q17 is connected with an anode of a diode VD2, a cathode of the diode VD2 is respectively connected with one end of a capacitor C145 and a cathode of a diode VD1, the other end of the capacitor C145 is grounded, and the anode of the diode VD1 is connected between the capacitor C144 and the inductor L14; two ends of the capacitor C145 are respectively connected with a capacitor C147, a capacitor C143, a capacitor C149, a capacitor C141 and a capacitor C148 in parallel in sequence; the VCC end of the control chip inputs +12V power, the BO pin and the CS pin of the control chip are respectively connected with two output ends of the rectifier bridge, and the FB pin of the control chip is connected with the anode of the diode VD2 through a resistor R140 and a resistor R137 in sequence.
The invention has the advantages that the notification of the power factor correction circuit for suppressing harmonic wave improves the efficiency, and the power factor correction circuit is isolated
The operating frequency in the DC/DC module is at the resonant frequency to improve efficiency. Adjustable DC/DC power on the output side
The road meets the requirement of wide-range output. Specific voltage and electricity can be obtained according to different requirements of users
A flow value. The adopted topological structure has low complexity, is easy to realize and effectively controls the cost.
Drawings
The present specification includes the following drawings, the contents of which are respectively:
FIG. 1 is a block diagram of the principles of the construction of the present invention;
FIG. 2 is a schematic diagram of an EMI filter;
FIG. 3 is a schematic circuit diagram of a PFC module;
FIG. 4 is a schematic diagram of a first enabling circuit;
FIG. 5 is a second enable circuit diagram;
FIG. 6 is a schematic diagram of a control circuit;
FIG. 7 is a schematic diagram of a signal conditioning circuit;
FIG. 8 is a circuit diagram of a first acquisition module voltage acquisition;
FIG. 9 is a second acquisition unit voltage acquisition circuit diagram;
FIG. 10 is a circuit diagram of a second acquisition unit current acquisition;
FIG. 11 is a diagram of an MCU chip;
marked in the figure as: 1. a main grid; 2. an EMI filter; 3. a rectifier bridge; 4. a power factor correction module; 5. isolating the DC/DC module; 6. an adjustable DC/DC module; 7. an MCU; 8. a first acquisition module; 9. a second acquisition module; 10. a control circuit; 11. a first enabling circuit; 12. a second enabling circuit; 13. a signal conditioning circuit.
Detailed Description
The following detailed description of the embodiments of the invention, given by way of example only, is presented in the accompanying drawings to aid in a more complete, accurate and thorough understanding of the concepts and aspects of the invention, and to aid in its practice, by those skilled in the art.
As shown in fig. 1, a switching power supply includes a main power grid 1, an EMI filter 2, a rectifier bridge 3, an isolated DC/DC module 5, an adjustable DC/DC module 6, an MCU7, a first acquisition module 8, a second acquisition module 9, and a control circuit 10, wherein an output end of the main power grid 1 is connected with an input end of the EMI filter 2, an output end of the EMI filter 2 is connected with an input end of the rectifier bridge 3, an output end of the rectifier bridge 3 is connected with a power factor correction module, an output end of the power factor correction module is connected with the isolated DC/DC module 5, and an output end of the isolated DC/DC module 5 is connected with a load through the adjustable DC/DC output. The first acquisition module 8 acquires output voltage data of the isolation DC/DC module 5, and the second acquisition module 9 acquires voltage and current data output by the adjustable DC/DC module 6; the output end of the first acquisition module 8 and the output end of the second acquisition module 9 are both connected with the input end of the MCU7, and the output end of the MCU7 respectively controls the output voltages of the isolation DC/DC module 5 and the adjustable DC/DC module 6 through the control circuit 10. The MCU7 module is respectively connected with the isolation DC/DC module 5 and the adjustable DC/DC module 6 through a first enabling circuit 11 and a second enabling circuit 12. The MCU7 is implemented with NCP 1397B.
The output of the main power grid 1 is filtered by the EMI filter 2 and then is output to the rectifier bridge 3, the output of the rectifier bridge 3 is output to the power factor correction module for improving the power factor to more than 95%, the output end of the power factor correction module is sequentially output to a load after passing through the isolation DC/DC module 5 and the adjustable DC/DC module 6, meanwhile, the MCU7 is respectively connected with the adjustable DC/DC and the data information of the isolation DC/DC module 5 according to the first acquisition module 8 and the second acquisition module 9, and the work of the DC/DC module is respectively regulated through the enabling circuit and the control circuit 10 after analysis and processing. The MCU7 analyzes the acquired data and then sends out control signals to control the isolation DC/DC module 5 and the adjustable DC/DC module 6 so as to achieve the power corresponding to the load requirement of the output end. The signal conditioning circuit 13 is used for collecting voltage data of the main power grid 1, judging whether the main power grid 1 outputs normally, and controlling the working state of the adjustable DC/DC chip to be in a state of not performing voltage conversion or prohibiting work when the main power grid 1 outputs normally so as to reduce power consumption and meet the load by isolating DC/DC output.
For the safety of the voltage at the output end of the MCU7, a clamp protection circuit is arranged at the input end of the MCU7 for limiting the voltage value of the input port of the MCU7. The clamping protection circuit is composed of two diodes with anode and cathode connected in series in sequence, the anode of the diode D1 is connected with a-5V power supply, the cathode of the diode D1 is connected with the anode of the diode D2, the cathode of the diode D2 is connected with a +5V power supply, and the clamping protection circuit is connected between the cathode of the diode D1 and the anode of the diode D2 at the output end of the MCU7 and used for protecting an IO port from being damaged by overlarge voltage.
As shown in fig. 2, which is a schematic diagram of the EMI filter 2, an input terminal of the EMI filter 2 is connected to an output terminal of the main power grid 1, and an output terminal of the EMI filter 2 is connected to an output terminal of the rectifier bridge 3. The EMI filter 2 is configured to filter high-frequency interference, where the EMI filter circuit includes a capacitor C140, a capacitor C146, a capacitor C142, a common-mode inductor L15, a capacitor C150, a capacitor C151, and a capacitor C139, and an output signal of the main power grid 1 is sequentially connected in series through the capacitor C140 and the capacitor C146 to form a common-mode interference suppression circuit, and the common-mode interference suppression circuit is formed by the capacitor C142, the common-mode inductor L15, the common-mode interference suppression capacitor C142, the capacitor C139, and the capacitor C151 and then output. While being grounded between the capacitor C139 and the capacitor C151. An output terminal is led out from one end of the C139, the other end of the C139 is connected with one end of the C151, an output terminal is led out from the other end of the C151, and the two output terminals are respectively connected to the two input ends of the rectifier bridge 3. The rectifier bridge 3 is a schottky diode to form a bridge rectifier circuit. And outputting the output rectified half wave to a power factor correction module for improving and suppressing harmonic waves.
As shown in fig. 3, the power factor correction module includes a switch Q17, a freewheeling diode VD2, and a control chip, where the control chip uses NPC1654, two output ends of the rectifier bridge 3 are connected in parallel with a capacitor C144, one end of the capacitor C144 is connected to a source of the Q17, the other end of the capacitor C144 is connected to a drain of the Q17 through an inductor, a gate of the Q17 is connected to a DRV pin of the control chip, the source of the Q17 is grounded, the drain of the Q17 is connected to an anode of the diode VD2, a cathode of the diode VD2 is connected to one end of the capacitor C145 and a cathode of the diode VD1, the other end of the capacitor C145 is grounded, an anode of the diode VD1 is connected between the capacitor C144 and the inductor L14, and the VD1 protects the inductor from a consumption loop at an instantaneous reverse voltage without damaging hardware; two ends of the capacitor C145 are respectively connected with the capacitor C147, the capacitor C143, the capacitor C149, the capacitor C141 and the capacitor C148 in parallel in sequence, and two ends of the capacitor C148 are led out of the output end of the power factor correction module; the VCC end of the control chip inputs +12V power, the BO pin and the CS pin of the control chip are respectively connected with two output ends of the rectifier bridge 3, and the FB pin of the control chip is connected with the anode of the diode VD2 through a resistor R140 and a resistor R137 in sequence. The GND pin of the control chip is grounded, and the VM pin of the control chip is grounded through a resistor. The VCON pin of the control chip is grounded through a resistor R144 and a capacitor C155 in sequence, and a capacitor C158 is connected in parallel to two ends of a series circuit formed by the resistor R144 and the capacitor C155.
Referring to fig. 4, a schematic diagram of a first enabling circuit 11 is shown, which is composed of an optocoupler HCPL-817-500AE and a transistor Q16, wherein the source electrode of the transistor is grounded, the gate electrode is connected to a power source +15v through a resistor R115, the power source +15v is connected to one input end of the optocoupler through a resistor R107, the other input end of the optocoupler is connected to the drain electrode of the transistor Q16, the gate electrode is grounded through a capacitor C114 after passing through the resistor R115, and the output end of the optocoupler is connected to an isolated DC/DC module 5. As shown in fig. 5, in one circuit implementation manner of the second enabling module, the output end of the MCU7 is connected to the drain electrode of Q5, the source electrode of Q5 is grounded and connected to the drain electrode through a capacitor C47, the +15v power supply is connected to the drain electrode of Q5 through a resistor R35, the gate electrode is connected to the adjustable DC/DC module 6, and the gate electrode is connected to the +15v power supply through a resistor R36.
As shown in fig. 6, a control circuit 10 is provided for controlling the isolation DC/DC module 5 and the adjustable DC/DC module 6, and includes a chip HEF40106B and an operational amplifier, wherein an output signal of the MCU7 sequentially passes through the chip HEF40106B, a resistor R42 and a resistor R41 and then is connected with a non-inverting input end of the operational amplifier, and the non-inverting input end is grounded through a capacitor C50. The inverting input is connected to the output while the inverting input is connected between resistors R41 and R42 via capacitor C49. The output end of the operational amplifier is connected with the adjustable DC/DC module 6 or the isolation DC/DC module 5 through a resistor. Fig. 7 is a schematic diagram of the signal conditioning circuit 13, which is used for detecting the alternating current of the main power grid 1, collecting and inputting the alternating current into the MCU7, wherein two input ends of the alternating current are respectively connected with an N line and an L line of the main power grid 1, and then respectively connected with an in-phase input end and an anti-phase input end of the OP2A through resistors, the anti-phase input end is connected with an output end through a resistor R156, two ends of the resistor R156 are connected with a capacitor C156 in parallel, the output end of the OP2A is connected with the anti-phase input end of the OP3A through a resistor R161, the in-phase input end of the OP3A is grounded, the output end of the OP3A is connected with the anti-phase input end of the OP3A through a capacitor C160, and then connected with the output end of the optocoupler HCNR201 through a resistor, and the output end of the OP2A is input to the AD input end of the MCU7.
Fig. 8 is a circuit diagram of the first acquisition module 8 for acquiring voltage, wherein the rear end of the acquired signal classical group R93 is connected with one end of a resistor R95 and one end of a resistor R98, the other end of the resistor R98 is grounded, and the other end of the resistor R95 is connected with the MCU7. Resistor R98 is connected in parallel with capacitor C109. And a clamp protection circuit is arranged for preventing the excessive voltage. Fig. 9 and 10 are an implementation of a current and voltage acquisition circuit of the second acquisition unit for acquiring voltage and current data of the adjustable DC/DC module 6, respectively.
In the invention, as shown in fig. 11, the chip schematic diagram of the MCU7 is a NCP1397B chip for controlling the DC/DC module, wherein the CSS leg is grounded via a resistor R8 and a capacitor C107, the RT leg is grounded via a resistor R88 after being connected to the capacitor C107, the RT leg is grounded via a resistor R91, the Ctimer leg is grounded via a resistor R92, and the two ends of R92 are connected in parallel to the capacitor C106. The chip has an overcurrent protection function, a current source is formed by R79, R83, R87, C108, D21, D22 and R99, and the current is converted into voltage by using R102 through detecting the voltage of a resonance capacitor and is output to a filter capacitor C112 and then transmitted to a Fault port. When the Fault port voltage reaches a threshold of 1.04V, the CSS internal ground switch opens with C107 to start discharging, when the C107 voltage drops, the working frequency is increased, the Rt discharge current is increased, the output voltage of the circuit is increased, the current is decreased, and the purpose of protecting the switch tube is achieved. And when the C106 is full, namely overcurrent, the chip enters an overcurrent protection mode, the C106 is not charged, the C107 discharges through the R92, the chip is started when reaching 1V, the voltage of the Fault port is monitored again, and if the voltage is still at high voltage, the charging and discharging of the C107 are continued, and the periodic monitoring state is removed, similar to a scanning period.
The invention is described above by way of example with reference to the accompanying drawings. It will be clear that the invention is not limited to the embodiments described above. As long as various insubstantial improvements are made using the method concepts and technical solutions of the present invention; or the invention is not improved, and the conception and the technical scheme are directly applied to other occasions and are all within the protection scope of the invention.
Claims (1)
1. The switching power supply circuit comprises a main power grid, an EMI filter and a rectifier bridge, wherein the output end of the main power grid is connected with the input end of the EMI filter, and the output end of the EMI filter is connected with the input end of the rectifier bridge, and the switching power supply circuit is characterized in that: the power factor correction module is connected with the load after passing through the isolation DC/DC module and the adjustable DC/DC module in sequence, the first acquisition module acquires output voltage data of the isolation DC/DC module, and the second acquisition module acquires voltage and current data output by the adjustable DC/DC module; the output end of the first acquisition module and the output end of the second acquisition module are both connected with the input end of the MCU, and the output ends of the MCU respectively control the output voltages of the isolation DC/DC module and the adjustable DC/DC module through a control circuit;
the MCU is respectively connected with the isolation DC/DC module and the adjustable DC/DC module through the first enabling circuit and the second enabling circuit; the MCU is realized by NCP 1397B; the signal conditioning circuit is connected with the main power grid at the input end and the MCU at the output end;
the EMI filter comprises a capacitor C140, a capacitor C146, a capacitor C142, a common mode inductance L15, a capacitor C150, a capacitor C151 and a capacitor C139, the output signal of the main power grid is sequentially connected in series through a capacitor C140 and a capacitor C146 to form a common-mode interference suppression circuit, a differential-mode suppression capacitor C142, a common-mode inductor L15, a differential-mode suppression capacitor C150, a capacitor C139 and a common-mode interference suppression circuit formed by a capacitor C151 and then is output; the power factor correction module comprises a switch tube Q17, a follow current diode VD2 and a control chip, wherein the control chip adopts an NPC1654, two output ends of a rectifier bridge are connected with a capacitor C144 in parallel, one end of the capacitor C144 is connected with a source electrode of the Q17, the other end of the capacitor C144 is connected with a drain electrode of the Q17 through an inductor, a grid electrode of the Q17 is connected with a DRV pin of the control chip, the source electrode of the Q17 is grounded, the drain electrode of the Q17 is connected with an anode of a diode VD2, a cathode of the diode VD2 is respectively connected with one end of a capacitor C145 and a cathode of a diode VD1, the other end of the capacitor C145 is grounded, and the anode of the diode VD1 is connected between the capacitor C144 and the inductor L14; two ends of the capacitor C145 are respectively connected with a capacitor C147, a capacitor C143, a capacitor C149, a capacitor C141 and a capacitor C148 in parallel in sequence; the VCC end of the control chip inputs a +12V power supply, the BO pin and the CS pin of the control chip are respectively connected with two output ends of the rectifier bridge, and the FB pin of the control chip is connected with the cathode of the diode VD2 through a resistor R140 and a resistor R137 in sequence;
the input end of the MCU is provided with a clamping protection circuit which is used for limiting the voltage value of the input port of the MCU; the clamping protection circuit is composed of two diodes with anode and cathode connected in series in sequence, the anode of the diode D1 is connected with a-5V power supply, the cathode of the diode D1 is connected with the anode of the diode D2, the cathode of the diode D2 is connected with a +5V power supply, and the clamping protection circuit is connected between the cathode of the diode D1 and the anode of the diode D2 at the output end of the MCU to protect an IO port from being damaged by overlarge voltage;
the first enabling circuit consists of an optocoupler HCPL-817-500AE and a transistor Q16, wherein the source electrode of the transistor is grounded, the grid electrode of the transistor is connected with a power supply +15V through a resistor R115, the power supply +15V is connected with one input end of the optocoupler through a resistor R107, the other input end of the optocoupler is connected with the drain electrode of the transistor Q16, the grid electrode of the optocoupler is grounded through a capacitor C114 after passing through the resistor R115, and the output end of the optocoupler is connected with an isolation DC/DC module;
one circuit implementation of the second enabling module: the MCU output end is connected to the drain electrode of the Q5, the source electrode of the Q5 is grounded, the source electrode is connected to the drain electrode through a capacitor C47, a +15V power supply is connected to the drain electrode of the Q5 through a resistor R35, the grid electrode is connected to the adjustable DC/DC module, and the grid electrode is connected to the +15V power supply through a resistor R36;
the signal conditioning circuit is used for detecting alternating current of the main power grid 1, acquiring and inputting the alternating current into the MCU, wherein two input ends of the signal conditioning circuit are respectively connected with an N line and an L line of the main power grid 1, respectively connected with an in-phase input end and an opposite-phase input end of the operational amplifier OP2A after being respectively connected with a resistor, the opposite-phase input end is connected with an output end through a resistor R156, two ends of the resistor R156 are connected with a capacitor C156 in parallel, the output end of the operational amplifier OP2A is connected with the opposite-phase input end of the operational amplifier OP3A through a resistor R161, the in-phase input end of the operational amplifier OP3A is grounded, the output end of the operational amplifier OP3A is connected with the opposite-phase input end of the operational amplifier through a capacitor C160, the input end of the optical coupler HCNR201 is connected with the output end of the optical coupler HCNR201 through the operational amplifier OP4A, and then the output end of the optical coupler HCNR201 is input to the AD input end of the MCU;
the MCU chip is NCP1397B chip, which is used for controlling DC/DC module, its CSS foot is grounded through resistor R85, capacitor C107, RT foot is grounded through resistor R88 after connecting capacitor C107, RT foot is grounded through resistor R91, ctiner foot is grounded through resistor R92, both ends of R92 are connected with capacitor C106 in parallel; the chip has an overcurrent protection function, a current source is formed by R79, R83, R87, C108, D21, D22 and R99, the voltage of a resonance capacitor is detected, the current is converted into voltage by using R102, the voltage is output to a filter capacitor C112, and the voltage is transmitted to a Fault port; the power supply is connected to one end of a capacitor C108 through resistors R79, R83 and R87 which are sequentially connected in series, the other end of the capacitor C109 is respectively connected to the anode of a diode D21 and the cathode of a diode D22, the anode of the diode D22 is grounded, and the cathode of the diode D21 is connected to a Fault port through the resistor R99; the Fault port is grounded through a capacitor C112, and a resistor R102 is connected in parallel with two ends of the capacitor C112;
when the voltage of the Fault port reaches a threshold value of 1.04V, the internal grounding switch of the CSS is opened to start discharging from C107, when the voltage of the C107 is reduced, the working frequency is increased, the Rt discharging current is increased, the output voltage of the circuit is increased, the current is reduced, and the purpose of protecting the switching tube is achieved; meanwhile, the CTIMER charges the C106, when the C106 is full and still in the condition of Fault high voltage, namely overcurrent, the chip enters an overcurrent protection mode, at the moment, the C106 is not charged again, the C107 discharges through the R91, the chip is started when reaching 1V, the Fault port voltage is monitored again, and if the C106 is still in the condition of high voltage, the charging and discharging of the C107 are continued, and the state is periodically monitored.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
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| US8184455B2 (en) * | 2008-12-30 | 2012-05-22 | Fsp Technology Inc. | Power adapter having power factor correction circuit, switch voltage regulation circuit and voltage stabilization circuit controlled by feedback signal |
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| CN102905417A (en) * | 2011-07-25 | 2013-01-30 | 全汉企业股份有限公司 | Load driving device and method thereof |
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