CN106208758A - A kind of instantaneous protection type PWM inverse-excitation type switch power-supply - Google Patents
A kind of instantaneous protection type PWM inverse-excitation type switch power-supply Download PDFInfo
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- CN106208758A CN106208758A CN201610630968.1A CN201610630968A CN106208758A CN 106208758 A CN106208758 A CN 106208758A CN 201610630968 A CN201610630968 A CN 201610630968A CN 106208758 A CN106208758 A CN 106208758A
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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
- H02M7/04—Conversion of ac power input into dc power output without possibility of reversal by static converters
- H02M7/12—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/21—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M7/217—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
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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
-
- 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
-
- 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
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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)
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Abstract
The invention discloses a kind of instantaneous protection type PWM inverse-excitation type switch power-supply; it is characterized in that: main by control chip U2; the compositions such as transformator T2, is serially connected in the constant-current source circuit between the VCC pin of control chip U2 and the former limit of transformator T2, the soft starting circuit being connected with constant-current source circuit.The present invention uses UC3842 as control chip, and combines the peripheral circuit of novelty, can effectively reduce the power consumption of self, make the efficiency of the present invention reach more than 95%.Meanwhile, the present invention can export constant voltage, it is possible to preferably for electricity consumption load supplying.The temporary impact electric current that energising momentary capacitance device can also effectively be produced by the present invention limits, thus protects electronic component to be not damaged by, and improves the service life of the present invention.
Description
Technical field
The present invention relates to a kind of power supply, specifically refer to a kind of instantaneous protection type PWM inverse-excitation type switch power-supply.
Background technology
Switching Power Supply is to utilize modern power electronics technology to control the time ratio that switching tube turns on and off, and remains stable
A kind of power supply of output voltage, it is widely used in the fields such as industrial automatic control, military industry equipment, research equipment.Along with
The development of society, improving constantly of the energy-conserving and environment-protective consciousness of people, the efficiency of Switching Power Supply is proposed higher by people
Requirement.But, the power consumption of current Switching Power Supply self is higher, causes its utilization rate of electrical too low, it is impossible to meet the need of people
Ask.
Summary of the invention
The power consumption that it is an object of the invention to solve current Switching Power Supply self is higher, causes its utilization rate of electrical too low
Defect, it is provided that a kind of instantaneous protection type PWM inverse-excitation type switch power-supply.
The purpose of the present invention is by following technical proposals reality: a kind of instantaneous protection type PWM inverse-excitation type switch power-supply, mainly
By control chip U2, transformator T2, the constant-current source being serially connected between the VCC pin of control chip U2 and the former limit of transformator T2 electricity
Road, the soft starting circuit being connected with constant-current source circuit, the transformer rectifier circuit being connected with soft starting circuit, with transformator T2
The output circuit that is connected of secondary, be serially connected in the feedback link between control chip U2 and output circuit, be serially connected in control core
Switch triggering circuit between sheet U2 and constant-current source circuit, positive pole is connected with the RT/CT pin of control chip U2, minus earth
The diode that electric capacity C7, P pole is connected with the negative pole of electric capacity C7, N pole positive pole with electric capacity C7 after resistance R11 is connected
D7, the resistance R13 that one end is connected with the CS pin of control chip U2, the other end is then connected with switch triggering circuit, positive pole
Be connected with the CS pin of control chip U2, electric capacity C6 that negative pole is then connected with switch triggering circuit, negative pole and control chip
The electric capacity C5 that COMP pin is connected, positive pole is connected with feedback link of U2, the resistance R8, Yi Jiyi being in parallel with electric capacity C5
End is connected with the GND pin of control chip U2, the resistance R9 of other end ground connection composition；The VCC pin of described control chip U2
Be connected with constant-current source circuit, its FB pin and REF pin is all connected with feedback link, its OUT pin and switch triggering electricity
Road is connected；The N pole of described diode D7 is also connected with the REF pin of control chip U2.
Further, described soft starting circuit is by processing chip U3, and audion VT7, N pole and the VCC processing chip U3 manage
Foot is connected, P pole as the Zener diode D13 of the input of this soft starting circuit, the P pole of negative pole and Zener diode D13
Be connected, electric capacity C10 that positive pole is connected with the DRI pin of process chip U3, negative pole after resistance R17 with process chip U3's
The electric capacity that VCC pin is connected, positive pole is sequentially connected with the SC pin processing chip U3 after resistance R18 through resistance R16
C11, P pole is connected with the SC pin processing chip U3, N pole as the Zener diode D15 of the outfan of this soft starting circuit,
The electric capacity C14 that positive pole is connected with the N pole of Zener diode D15, negative pole then colelctor electrode with audion VT7 is connected, with electricity
Resistance R19, the P pole that appearance C14 is in parallel is connected with the SE pin processing chip U3, N pole is connected with the base stage of audion VT7
Diode D14, positive pole and process chip U3 the electricity that TC pin is connected, negative pole is connected with the emitter stage of audion VT7
Hold C13, positive pole with process chip U3 FB pin be connected, negative pole sequentially after inductance L7 and resistance R21 with audion VT7's
The electric capacity C12 that emitter stage is connected, the resistance R22 being in parallel with resistance R21, and the GND pin of one end and process chip U3
Be connected, the resistance R20 of other end ground connection forms；The described IPK pin of process chip U3 is connected with the negative pole of electric capacity C11；
The input of described soft starting circuit is connected with transformer rectifier circuit, its outfan is then connected with constant-current source circuit.
Described transformer rectifier circuit is by transformator T1, diode rectifier U1, and positive pole is electric with the former limit of transformator T1
The electric capacity that the non-same polarity of sense coil L1 is connected, negative pole then Same Name of Ends with the secondary inductance coil L2 of transformator T1 is connected
C1 forms；The input of described diode rectifier U1 respectively with Same Name of Ends and the transformation of the former limit inductance coil L1 of transformator T1
The non-same polarity of the secondary inductance coil L2 of device T1 is connected；The cathode output end of described diode rectifier U1 and voltage stabilizing two pole
The P pole of pipe D13 is connected, its cathode output end ground connection.
Described constant-current source circuit is by field effect transistor MOS1, audion VT1, audion VT2, audion VT3, negative pole and transformation
The Same Name of Ends of the former limit inductance coil L4 of device T2 is connected, the electric capacity C2 of plus earth, is serially connected in the drain electrode of field effect transistor MOS1
With resistance R1, the N pole between the positive pole of electric capacity C2 is connected with the negative pole of electric capacity C2, P pole is connected with the base stage of audion VT2
Zener diode D1, be serially connected in the resistance R2 between emitter stage and the grid of field effect transistor MOS1 of audion VT1, negative pole with
The base stage of audion VT3 is connected, positive pole base stage with audion VT1 after resistance R3 is connected electric capacity C3, P pole and electric capacity
The Zener diode D2 that the positive pole of C3 is connected, N pole is connected with the grid of field effect transistor MOS1, is serially connected in audion VT3's
Resistance R4, P pole between the N pole of colelctor electrode and Zener diode D2 is connected with switch triggering circuit, N pole after resistance R5 with
The diode D3 that the colelctor electrode of audion VT3 is connected, and negative pole is connected with the N pole of diode D3, positive pole and voltage stabilizing two
The electric capacity C4 composition that the N pole of pole pipe D2 is connected；The grid of described field effect transistor MOS1 is extremely connected with the N of Zener diode D15
Connect, its source electrode then colelctor electrode with audion VT2 is connected；The emitter stage of described audion VT2 is connected with the negative pole of electric capacity C2
Connect, its base stage then colelctor electrode with audion VT1 is connected, colelctor electrode then positive pole with electric capacity C3 is connected；Described audion
The emitter stage of VT3 be connected with the non-same polarity of the former limit inductance coil L3 of transformator T2 while ground connection；Described transformator T2
The former Same Name of Ends of limit inductance coil L3 be connected with the positive pole of electric capacity C4；The former limit inductance coil L4's of described transformator T2 is non-
Same Name of Ends ground connection；The VCC pin of described control chip U2 is connected with the positive pole of electric capacity C2.
Described output circuit is connected by the non-same polarity of diode D10, P pole with the secondary inductance coil L5 of transformator T2
Connect, N pole with diode D10 after inductance L6, N pole is collectively forming the Zener diode D11 of outfan, with Zener diode D11
The resistance R15 being in parallel, the electricity that positive pole is connected with the P pole of Zener diode D11, negative pole is connected with the P pole of diode D10
Hold C9, and N pole with Zener diode D11 after inductance L6, N pole is connected, P pole is connected with the N pole of diode D10
Zener diode D12 forms；The Same Name of Ends of secondary inductance coil L5 of described transformator T2 is connected with the P pole of diode D10；
The P pole of described diode D10 is the most all connected with feedback link with N.
Described switch triggering circuit, by field effect transistor MOS2, audion VT5, audion VT6, is serially connected in control chip U2's
Resistance R12, P pole between OUT pin and the grid of field effect transistor MOS2 is connected with the source electrode of field effect transistor MOS2, N pole with
The diode D8 that the base stage of audion VT5 is connected, positive pole is connected with the drain electrode of field effect transistor MOS2, negative pole is through resistance R14
Electric capacity C8, the N pole that emitter stage with audion VT6 is connected afterwards is connected with the grid of field effect transistor MOS2, P pole ground connection steady
Pressure diode D6, and the diode D9 group that N pole is connected with the base stage of audion VT6, P pole is connected with the negative pole of electric capacity C8
Become；The grid of described field effect transistor MOS2 CS pin with control chip U2 after resistance R13 is connected, its drain electrode the most respectively with
The negative pole of electric capacity C6 is connected with feedback link；The grounded collector of described audion VT5, its emitter stage are with audion VT6's
Base stage is connected；The colelctor electrode of described audion VT6 is connected with the P pole of diode D3.
Described feedback link routing optocoupler A1, audion VT4, P pole after resistance R10 with the of photoelectrical coupler A1
The diode D4 that two outfans are connected, N pole is connected with the positive pole of electric capacity C5, be serially connected in control chip U2 REF pin and
Resistance R6 between the N pole of diode D4, and N pole is connected with the FB pin of control chip U2, P pole after resistance R7 with three
The diode D5 composition that the colelctor electrode of pole pipe VT4 is connected；The emitter stage of described audion VT4 and the first of photoelectrical coupler A1
Outfan is connected, its base stage is then connected with the drain electrode of field effect transistor MOS2；The first input end of described photoelectrical coupler A1
Be connected with the P pole of diode D10, its second input is then connected with the N pole of diode D10.
Described control chip U2 is the integrated chip of UC3842；Described process chip U3 is the integrated chip of H34063A.
The present invention compared with prior art has the following advantages and beneficial effect:
(1) present invention uses UC3842 as control chip, and combines the peripheral circuit of novelty, can effectively reduce from
The power consumption of body, makes the efficiency of the present invention reach more than 95%.
(2) present invention can export constant voltage, it is possible to preferably for electricity consumption load supplying.
(3) the temporary impact electric current that energising momentary capacitance device can effectively be produced by the present invention limits, thus protects
Protect electronic component to be not damaged by, improve the service life of the present invention.
Accompanying drawing explanation
Fig. 1 is the overall structure schematic diagram of the present invention.
Fig. 2 is the structure chart of the soft starting circuit of the present invention.
Detailed description of the invention
Below in conjunction with embodiment, the present invention is described in further detail, but embodiments of the present invention are not limited to
This.
Embodiment
As it is shown in figure 1, the present invention is mainly by control chip U2, transformator T2, be serially connected in control chip U2 VCC pin and
Constant-current source circuit between the former limit of transformator T2, the soft starting circuit being connected with constant-current source circuit, with soft starting circuit phase
The transformer rectifier circuit connected, the output circuit being connected with the secondary of transformator T2, it is serially connected in control chip U2 and output electricity
Feedback link between road, the switch triggering circuit being serially connected between control chip U2 and constant-current source circuit, positive pole and control core
The RT/CT pin of sheet U2 is connected, electric capacity C7, the P pole of minus earth is connected with the negative pole of electric capacity C7, N pole is after resistance R11
The diode D7 being connected with the positive pole of electric capacity C7, one end is connected with the CS pin of control chip U2, the other end then with switch
Trigger the resistance R13 that is connected of circuit, positive pole is connected with the CS pin of control chip U2, negative pole then with switch triggering circuit phase
The electric capacity C6 connected, the electric capacity C5 that COMP pin is connected, positive pole is connected with feedback link of negative pole and control chip U2, with
The resistance R8 that electric capacity C5 is in parallel, and one end is connected with the GND pin of control chip U2, the resistance R9 group of other end ground connection
Become.
The VCC pin of described control chip U2 is connected with constant-current source circuit, and its FB pin and REF pin are all and feedback link
Road is connected, and its OUT pin is connected with switch triggering circuit.The N pole of described diode D7 is also managed with the REF of control chip U2
Foot is connected.In order to preferably implement the present invention, described control chip U2 preferentially uses the integrated chip of UC3842 to realize.
Wherein, described transformer rectifier circuit is by transformator T1, diode rectifier U1, and positive pole and transformator T1's is former
The non-same polarity of limit inductance coil L1 is connected, negative pole then Same Name of Ends with the secondary inductance coil L2 of transformator T1 is connected
Electric capacity C1 forms.The input of described diode rectifier U1 respectively with the Same Name of Ends of the former limit inductance coil L1 of transformator T1 and
The non-same polarity of the secondary inductance coil L2 of transformator T1 is connected.The cathode output end of described diode rectifier U1 opens with soft
The input on galvanic electricity road is connected, its cathode output end ground connection.
This constant-current source circuit is by field effect transistor MOS1, audion VT1, audion VT2, audion VT3, resistance R1, resistance
R2, resistance R3, resistance R4, resistance R5, Zener diode D1, Zener diode D2, diode D3, electric capacity C2, electric capacity C3 and
Electric capacity C4 forms.
During connection, the negative pole of electric capacity C2 is connected with the Same Name of Ends of the former limit inductance coil L4 of transformator T2, plus earth.
Resistance R1 is serially connected between the drain electrode of field effect transistor MOS1 and the positive pole of electric capacity C2.The N pole of Zener diode D1 is with electric capacity C2's
Negative pole is connected, and P pole is connected with the base stage of audion VT2.Resistance R2 is serially connected in emitter stage and the field effect transistor of audion VT1
Between the grid of MOS1.The negative pole of electric capacity C3 is connected with the base stage of audion VT3, positive pole after resistance R3 with audion VT1
Base stage be connected.The P pole of Zener diode D2 is connected with the positive pole of electric capacity C3, the grid phase of N pole and field effect transistor MOS1
Connect.Resistance R4 is serially connected between the colelctor electrode of audion VT3 and the N pole of Zener diode D2.The P pole of diode D3 and switch
Triggering circuit is connected, and N pole colelctor electrode with audion VT3 after resistance R5 is connected.The negative pole of electric capacity C4 and diode D3
N pole be connected, positive pole is connected with the N pole of Zener diode D2.
The grid of this field effect transistor MOS1 is connected with the outfan of soft starting circuit, and its source electrode is then with audion VT2's
Colelctor electrode is connected.The emitter stage of described audion VT2 is connected with the negative pole of electric capacity C2, and its base stage is then with audion VT1's
Colelctor electrode is connected, and colelctor electrode then positive pole with electric capacity C3 is connected.The emitter stage of described audion VT3 is former with transformator T2's
The non-same polarity of limit inductance coil L3 be connected while ground connection.The Same Name of Ends of the former limit inductance coil L3 of described transformator T2 with
The positive pole of electric capacity C4 is connected.The non-same polarity ground connection of the former limit inductance coil L4 of described transformator T2.Described control chip U2
VCC pin be connected with the positive pole of electric capacity C2.
Described output circuit by diode D10, Zener diode D11, Zener diode D12, electric capacity C9, inductance L6 and
Resistance R15 forms.
During connection, the P pole of Zener diode D11 is connected with the non-same polarity of the secondary inductance coil L5 of transformator T2, N
N pole with diode D10 after inductance L6, pole is collectively forming outfan.Resistance R15 is in parallel with Zener diode D11.Electric capacity
The positive pole of C9 is connected with the P pole of Zener diode D11, and negative pole is connected with the P pole of diode D10.Zener diode D12's
N pole with Zener diode D11 after inductance L6, N pole is connected, and P pole is connected with the N pole of diode D10.Described transformator
The Same Name of Ends of secondary inductance coil L5 of T2 is connected with the P pole of diode D10.The P pole of described diode D10 and N the most all with
Feedback link is connected.
This switch triggering circuit is by field effect transistor MOS2, audion VT5, audion VT6, resistance R12, resistance R14, two poles
Pipe D8, diode D9 and electric capacity C8 form.
During connection, resistance R12 is serially connected between OUT pin and the grid of field effect transistor MOS2 of control chip U2.Two poles
The P pole of pipe D8 is connected with the source electrode of field effect transistor MOS2, and N pole is connected with the base stage of audion VT5.The positive pole of electric capacity C8 with
The drain electrode of field effect transistor MOS2 is connected, and negative pole emitter stage with audion VT6 after resistance R14 is connected.Zener diode
The N pole of D6 is connected with the grid of field effect transistor MOS2, P pole ground connection.The N pole of diode D9 is connected with the base stage of audion VT6
Connecing, P pole is connected with the negative pole of electric capacity C8.
Meanwhile, the grid of described field effect transistor MOS2 CS pin with control chip U2 after resistance R13 is connected, its leakage
Pole is connected with negative pole and the feedback link of electric capacity C6 the most respectively.The grounded collector of described audion VT5, its emitter stage and three
The base stage of pole pipe VT6 is connected.The colelctor electrode of described audion VT6 is connected with the P pole of diode D3.
It addition, this feedback link routing optocoupler A1, audion VT4, diode D4, diode D5, resistance R6, resistance
R7 and resistance R10 composition.
During connection, the P pole of diode D4 second outfan with photoelectrical coupler A1 after resistance R10 is connected, N pole with
The positive pole of electric capacity C5 is connected.Resistance R6 is serially connected between the REF pin of control chip U2 and the N pole of diode D4.Diode
The N pole of D5 is connected with the FB pin of control chip U2, and P pole colelctor electrode with audion VT4 after resistance R7 is connected.
The emitter stage of this audion VT4 is connected with first outfan of photoelectrical coupler A1, its base stage then with field effect
The drain electrode of pipe MOS2 is connected.The first input end of described photoelectrical coupler A1 is connected with the P pole of diode D10, and it is second years old
Input is then connected with the N pole of diode D10.
The structure of this soft starting circuit as in figure 2 it is shown, it is by processing chip U3, audion VT7, resistance R16, resistance R17,
Resistance R18, resistance R19, resistance R20, resistance R21, resistance R22, Zener diode D13, diode D14, Zener diode
D15, electric capacity C10, electric capacity C11, electric capacity C12, electric capacity C13, electric capacity C14 and inductance L7 form.
During connection, the N pole of Zener diode D13 is connected with the VCC pin processing chip U3, and P pole is as this soft start
The input of circuit is also connected with the cathode output end of diode rectifier U1.The negative pole of electric capacity C10 and Zener diode D13
P pole be connected, positive pole with process chip U3 DRI pin be connected.The negative pole of electric capacity C11 after resistance R17 with process core
The VCC pin of sheet U3 is connected, and positive pole is sequentially connected with the SC pin processing chip U3 after resistance R18 through resistance R16.Surely
Pressure diode D15 P pole with process chip U3 SC pin be connected, N pole as this soft starting circuit outfan and with field
The grid of effect pipe MOS1 is connected.The positive pole of electric capacity C14 is connected with the N pole of Zener diode D15, negative pole then with audion
The colelctor electrode of VT7 is connected.Resistance R19 is in parallel with electric capacity C14.The P pole of diode D14 and the SE pin phase processing chip U3
Connecting, N pole is connected with the base stage of audion VT7.The positive pole of electric capacity C13 is connected with the TC pin processing chip U3, negative pole
It is connected with the emitter stage of audion VT7.The positive pole of electric capacity C12 is connected with the FB pin processing chip U3, negative pole sequentially warp
After inductance L7 and resistance R21, the emitter stage with audion VT7 is connected.Resistance R22 is in parallel with resistance R21.The one of resistance R20
The GND pin held and process chip U3 is connected, other end ground connection.The IPK pin of described process chip U3 is negative with electric capacity C11's
Pole is connected.In order to preferably implement the present invention, the described process chip U3 integrated chip of preferred H34063A realizes.
The present invention uses UC3842 as control chip, and combines the peripheral circuit of novelty, can effectively reduce self
Power consumption, make the efficiency of the present invention reach more than 95%.Meanwhile, the present invention can export constant voltage, it is possible to is preferably
Electricity consumption load supplying.The temporary impact electric current that energising momentary capacitance device can also effectively be produced by the present invention limits, from
And protect electronic component to be not damaged by, improve the service life of the present invention.
As it has been described above, just can well realize the present invention.
Claims (8)
1. an instantaneous protection type PWM inverse-excitation type switch power-supply, it is characterised in that: mainly by control chip U2, transformator T2, string
It is connected on the constant-current source circuit between the VCC pin of control chip U2 and the former limit of transformator T2, is connected with constant-current source circuit
Soft starting circuit, the transformer rectifier circuit being connected with soft starting circuit, the output circuit being connected with the secondary of transformator T2,
It is serially connected in the feedback link between control chip U2 and output circuit, is serially connected in opening between control chip U2 and constant-current source circuit
Closing and trigger circuit, positive pole is connected with the RT/CT pin of control chip U2, electric capacity C7, the P pole of minus earth is negative with electric capacity C7's
The diode D7 that pole is connected, N pole positive pole with electric capacity C7 after resistance R11 is connected, the CS pipe of one end and control chip U2
The resistance R13 that foot is connected, the other end is then connected with switch triggering circuit, positive pole is connected with the CS pin of control chip U2
Connect, electric capacity C6 that negative pole is then connected with switch triggering circuit, negative pole is connected with the COMP pin of control chip U2, positive pole with
The electric capacity C5 that feedback link is connected, the resistance R8 being in parallel with electric capacity C5, and the GND pin phase of one end and control chip U2
Connect, the resistance R9 of other end ground connection forms；The VCC pin of described control chip U2 is connected with constant-current source circuit, its FB pipe
Foot is all connected with feedback link with REF pin, its OUT pin is connected with switch triggering circuit；The N pole of described diode D7
Also it is connected with the REF pin of control chip U2.
A kind of instantaneous protection type PWM inverse-excitation type switch power-supply the most according to claim 1, it is characterised in that: described soft open
Galvanic electricity route processing chip U3, audion VT7, N pole is connected with the VCC pin processing chip U3, P pole is electric as this soft start
The Zener diode D13 of the input on road, negative pole is connected with the P pole of Zener diode D13, positive pole and process chip U3
The electric capacity C10 that DRI pin is connected, negative pole is connected with the VCC pin processing chip U3 after resistance R17, positive pole sequentially warp
Electric capacity C11, the P pole being connected with the SC pin processing chip U3 after resistance R16 and resistance R18 and the SC pin processing chip U3
Be connected, N pole as the Zener diode D15 of the outfan of this soft starting circuit, the N pole phase of positive pole and Zener diode D15
Connect, electric capacity C14 that negative pole then colelctor electrode with audion VT7 is connected, resistance R19, the P pole being in parallel with electric capacity C14 with
Process the diode D14 that SE pin is connected, N pole is connected of chip U3, positive pole and process chip with the base stage of audion VT7
The electric capacity C13 that the TC pin of U3 is connected, negative pole is connected with the emitter stage of audion VT7, positive pole and the FB processing chip U3
The electric capacity C12 that pin is connected, negative pole is sequentially connected through inductance L7 emitter stage with audion VT7 after resistance R21, with electricity
The resistance R22 that resistance R21 is in parallel, and one end is connected with the GND pin of process chip U3, the resistance R20 of other end ground connection
Composition；The described IPK pin of process chip U3 is connected with the negative pole of electric capacity C11；The input of described soft starting circuit is with whole
Rheology volt circuit is connected, its outfan is then connected with constant-current source circuit.
A kind of instantaneous protection type PWM inverse-excitation type switch power-supply the most according to claim 2, it is characterised in that: described rectification
Transforming circuit is by transformator T1, diode rectifier U1, and positive pole and the former limit inductance coil L1's of transformator T1 is non-of the same name
The electric capacity C1 composition that end is connected, negative pole then Same Name of Ends with the secondary inductance coil L2 of transformator T1 is connected；Described two poles
The input of pipe commutator U1 respectively with Same Name of Ends and the secondary inductance of transformator T1 of the former limit inductance coil L1 of transformator T1
The non-same polarity of coil L2 is connected；The cathode output end of described diode rectifier U1 is extremely connected with the P of Zener diode D13
Connect, its cathode output end ground connection.
A kind of instantaneous protection type PWM inverse-excitation type switch power-supply the most according to claim 3, it is characterised in that: described constant current
Source circuit is by the former limit inductor wire of field effect transistor MOS1, audion VT1, audion VT2, audion VT3, negative pole and transformator T2
The Same Name of Ends of circle L4 is connected, the electric capacity C2 of plus earth, be serially connected in the drain electrode of field effect transistor MOS1 and electric capacity C2 positive pole it
Between the Zener diode D1 that resistance R1, N pole is connected with the negative pole of electric capacity C2, P pole is connected with the base stage of audion VT2,
It is serially connected in the base stage of the resistance R2 between emitter stage and the grid of field effect transistor MOS1 of audion VT1, negative pole and audion VT3
Be connected, electric capacity C3, P pole that positive pole base stage with audion VT1 after resistance R3 is connected is connected with the positive pole of electric capacity C3,
The Zener diode D2 that N pole is connected with the grid of field effect transistor MOS1, is serially connected in colelctor electrode and voltage stabilizing two pole of audion VT3
Resistance R4, P pole between the N pole of pipe D2 is connected with switch triggering circuit, N pole after resistance R5 with the current collection of audion VT3
The diode D3 that pole is connected, and negative pole is connected with the N pole of diode D3, positive pole is extremely connected with the N of Zener diode D2
The electric capacity C4 composition connect；The grid of described field effect transistor MOS1 is connected with the N pole of Zener diode D15, its source electrode is then with three
The colelctor electrode of pole pipe VT2 is connected；The emitter stage of described audion VT2 is connected with the negative pole of electric capacity C2, its base stage is then with three
The colelctor electrode of pole pipe VT1 is connected, colelctor electrode then positive pole with electric capacity C3 is connected；The emitter stage of described audion VT3 and change
The non-same polarity of the former limit inductance coil L3 of depressor T2 be connected while ground connection；The former limit inductance coil L3 of described transformator T2
Same Name of Ends be connected with the positive pole of electric capacity C4；The non-same polarity ground connection of the former limit inductance coil L4 of described transformator T2；Described
The VCC pin of control chip U2 is connected with the positive pole of electric capacity C2.
A kind of instantaneous protection type PWM inverse-excitation type switch power-supply the most according to claim 4, it is characterised in that: described output
Circuit is connected by the non-same polarity of diode D10, P pole with the secondary inductance coil L5 of transformator T2, N pole after inductance L6 with
The N pole of diode D10 is collectively forming the Zener diode D11 of outfan, the resistance R15 being in parallel with Zener diode D11, just
The electric capacity C9 that pole is connected with the P pole of Zener diode D11, negative pole is connected with the P pole of diode D10, and N pole is through inductance
The Zener diode D12 composition that after L6, the N pole with Zener diode D11 is connected, P pole is connected with the N pole of diode D10；
The Same Name of Ends of secondary inductance coil L5 of described transformator T2 is connected with the P pole of diode D10；The P pole of described diode D10
The most all it is connected with feedback link with N.
A kind of instantaneous protection type PWM inverse-excitation type switch power-supply the most according to claim 5, it is characterised in that: described switch
Triggering circuit, by field effect transistor MOS2, audion VT5, audion VT6, is serially connected in OUT pin and the field effect of control chip U2
Resistance R12, P pole between the grid of pipe MOS2 is connected with the source electrode of field effect transistor MOS2, the base stage of N pole and audion VT5
The diode D8 being connected, positive pole is connected with the drain electrode of field effect transistor MOS2, negative pole after resistance R14 with audion VT6's
Electric capacity C8, the N pole that emitter stage is connected is connected with the grid of field effect transistor MOS2, the Zener diode D6 of P pole ground connection, and
The diode D9 composition that N pole is connected with the base stage of audion VT6, P pole is connected with the negative pole of electric capacity C8；Described field effect transistor
The grid of MOS2 CS pin with control chip U2 after resistance R13 is connected, its drain electrode the most respectively with the negative pole of electric capacity C6 and
Feedback link is connected；The grounded collector of described audion VT5, its emitter stage are connected with the base stage of audion VT6；Described
The colelctor electrode of audion VT6 is connected with the P pole of diode D3.
A kind of instantaneous protection type PWM inverse-excitation type switch power-supply the most according to claim 6, it is characterised in that: described feedback
Chain routing optocoupler A1, audion VT4, P pole second outfan with photoelectrical coupler A1 after resistance R10 is connected, N
The diode D4 that pole is connected with the positive pole of electric capacity C5, is serially connected between the REF pin of control chip U2 and the N pole of diode D4
Resistance R6, and N pole is connected with the FB pin of control chip U2, P pole after resistance R7 with the colelctor electrode phase of audion VT4
The diode D5 composition connected；The emitter stage of described audion VT4 is connected with first outfan of photoelectrical coupler A1, its base
Pole is then connected with the drain electrode of field effect transistor MOS2；The P pole phase of the first input end of described photoelectrical coupler A1 and diode D10
Connect, its second input is then connected with the N pole of diode D10.
A kind of instantaneous protection type PWM inverse-excitation type switch power-supply the most according to claim 7, it is characterised in that: described control
Chip U2 is the integrated chip of UC3842, and described process chip U3 is the integrated chip of H34063A.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610630968.1A CN106208758A (en) | 2016-08-02 | 2016-08-02 | A kind of instantaneous protection type PWM inverse-excitation type switch power-supply |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610630968.1A CN106208758A (en) | 2016-08-02 | 2016-08-02 | A kind of instantaneous protection type PWM inverse-excitation type switch power-supply |
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| CN106208758A true CN106208758A (en) | 2016-12-07 |
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| CN201610630968.1A Withdrawn CN106208758A (en) | 2016-08-02 | 2016-08-02 | A kind of instantaneous protection type PWM inverse-excitation type switch power-supply |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108347179A (en) * | 2017-01-24 | 2018-07-31 | 苏州未来电器股份有限公司 | The external breaker control system of electric energy meter and its PSR reverse exciting switching voltage regulator circuits |
-
2016
- 2016-08-02 CN CN201610630968.1A patent/CN106208758A/en not_active Withdrawn
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108347179A (en) * | 2017-01-24 | 2018-07-31 | 苏州未来电器股份有限公司 | The external breaker control system of electric energy meter and its PSR reverse exciting switching voltage regulator circuits |
| CN108347179B (en) * | 2017-01-24 | 2021-06-11 | 苏州未来电器股份有限公司 | External circuit breaker control system of electric energy meter and PSR flyback switching power supply circuit thereof |
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Application publication date: 20161207 |