CN106160494A - A kind of feedback signal processing-type PWM inverse-excitation type switch power-supply - Google Patents
A kind of feedback signal processing-type PWM inverse-excitation type switch power-supply Download PDFInfo
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- CN106160494A CN106160494A CN201610626657.8A CN201610626657A CN106160494A CN 106160494 A CN106160494 A CN 106160494A CN 201610626657 A CN201610626657 A CN 201610626657A CN 106160494 A CN106160494 A CN 106160494A
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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
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
- H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
- H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
- H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
- H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/33569—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having several active switching elements
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Abstract
The invention discloses a kind of feedback signal processing-type PWM inverse-excitation type switch power-supply, it is characterized in that: main by control chip U2, transformator T2, it 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 transformer rectifier circuit being connected with constant-current source circuit, the output circuit being connected with the secondary of transformator T2, the feedback signal processing circuit being connected with output circuit etc. forms.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%.Feedback signal is processed by the present invention, it is to avoid feedback signal distortion, makes the present invention preferably can adjust the pulsewidth of output voltage according to feedback signal, makes output voltage more stable.
Description
Technical field
The present invention relates to a kind of power supply, specifically refer to a kind of feedback signal processing-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 feedback signal processing-type PWM inverse-excitation type switch power-supply.
The purpose of the present invention is by following technical proposals reality: a kind of feedback signal processing-type PWM inverse-excitation type switch power-supply,
Main by control chip U2, transformator T2, it is serially connected in the constant current between the VCC pin of control chip U2 and the former limit of transformator T2
Source circuit, the transformer rectifier circuit being connected with constant-current source circuit, the output circuit being connected with the secondary of transformator T2, with defeated
Go out the feedback signal processing circuit that circuit is connected, be serially connected in the feedback link between control chip U2 and feedback signal processing circuit
The RT/CT pin of road, the switch triggering circuit being serially connected between control chip U2 and constant-current source circuit, positive pole and control chip U2
Be connected, electric capacity C7, the P pole of minus earth is connected with the negative pole of electric capacity C7, N pole after resistance R11 with the positive pole of electric capacity C7
The diode D7 being connected, one end is connected with the CS pin of control chip U2, the other end is then connected with switch triggering circuit
Resistance R13, the electric capacity C6 that positive pole is connected with the CS pin of control chip U2, negative pole is then connected with switch triggering circuit,
Negative pole and the electric capacity C5 that COMP pin is connected, positive pole is connected with feedback link of control chip U2, be in parallel with electric capacity C5
Resistance R8, and one end is connected with the GND pin of control chip U2, the resistance R9 of the other end ground connection composition；Described control
The VCC pin of chip U2 is connected with constant-current source circuit, its FB pin and REF pin is all connected with feedback link, its OUT pipe
Foot is connected with switch triggering circuit；The N pole of described diode D7 is also connected with the REF pin of control chip U2.
Further, described feedback signal processing circuit is by audion VT7, audion VT8, audion VT9, amplifier
P1, amplifier P2, the electric capacity that positive pole is connected with the emitter stage of audion VT7, negative pole is connected with the base stage of audion VT8
C10, N pole positive pole with amplifier P2 after resistance R19 is connected, the diode D13 of P pole ground connection, and one end is with audion VT8's
The resistance R17 that base stage is connected, the other end is connected with the P pole of diode D13 after resistance R18, one end is with amplifier P2's
Negative pole is connected, the resistance R20 of other end ground connection, and negative pole is connected with the positive pole of amplifier P2, positive pole and resistance R17 and resistance
Electric capacity C12, the P pole that the junction point of R18 is connected is connected with the N pole of diode D13, the emitter stage phase of N pole and audion VT9
The diode D14 connected, the electric capacity that positive pole is connected with the N pole of diode D14, negative pole is connected with the positive pole of amplifier P1
C11, and N pole positive pole with amplifier P2 after resistance R21 is connected, P pole after resistance R16 with the base stage of audion VT9
The diode D15 composition being connected；The base stage of described audion VT7 is all connected with output circuit with emitter stage, its colelctor electrode
It is connected with the emitter stage of audion VT8；The colelctor electrode of described audion VT9 is connected with the emitter stage of audion VT8, its base
Pole is connected with the colelctor electrode of audion VT8；The negative pole of described amplifier P1 is connected with the outfan of amplifier P2, described in put
The big outfan of device P1 is all connected with feedback link with the outfan of amplifier P2；The positive pole of described electric capacity C12 and audion
The emitter stage of VT7 is connected.
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 constant-current source electricity
Road 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 defeated with the positive pole of diode rectifier U1
Go out that end is connected, its source electrode then colelctor electrode with audion VT2 is connected；The emitter stage of described audion VT2 is with electric capacity C2's
Negative pole is connected, its base stage then colelctor electrode with audion VT1 is connected, colelctor electrode then positive pole with electric capacity C3 is connected；Institute
State ground connection while the emitter stage of audion VT3 is connected with the non-same polarity of the former limit inductance coil L3 of transformator T2；Described
The former Same Name of Ends of limit inductance coil L3 of transformator T2 is connected with the positive pole of electric capacity C4；The former limit inductor wire of described transformator T2
The non-same polarity ground connection of circle L4；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 connected with the emitter stage of audion VT7, its N pole is connected with the base stage of audion VT7.
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 outfan of amplifier P2, its second input then outfan with amplifier P1 is connected.
Described control chip U2 is the integrated chip of UC3842.
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) feedback signal is processed by the present invention, it is to avoid feedback signal distortion, makes the present invention can be preferably according to anti-
Feedback signal adjusts the pulsewidth of output voltage, makes output voltage more stable.
Accompanying drawing explanation
Fig. 1 is the overall structure schematic diagram of the present invention.
Fig. 2 is the structure chart of the feedback signal processing 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 transformer rectifier circuit being connected with constant-current source circuit, with transformator T2's
The output circuit that secondary is connected, the feedback signal processing circuit being connected with output circuit, it is serially connected in control chip U2 with anti-
Feedback link between feedback signal process circuit, the switch triggering circuit being serially connected between control chip U2 and constant-current source circuit,
Positive pole is connected with the RT/CT pin of control chip U2, electric capacity C7, the P pole of minus earth is connected with the negative pole of electric capacity C7, N
The diode D7 that pole positive pole with electric capacity C7 after resistance R11 is connected, one end is connected, separately with the CS pin of control chip U2
The resistance R13 that one end is then connected with switch triggering circuit, positive pole is connected with the CS pin of control chip U2, negative pole then with open
Closing and trigger the electric capacity C6 that circuit is connected, negative pole is connected with the COMP pin of control chip U2, positive pole is connected with feedback link
The electric capacity C5 connect, the resistance R8 being in parallel with electric capacity C5, and one end is connected with the GND pin of control chip U2, the other end
The resistance R9 composition of ground connection.
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 and constant current
Source circuit 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 cathode output end of diode rectifier U1, its source electrode then with three poles
The colelctor electrode of pipe VT2 is connected.The emitter stage of described audion VT2 is connected with the negative pole of electric capacity C2, its base stage then with three poles
The colelctor electrode of pipe VT1 is connected, and colelctor electrode then positive pole with electric capacity C3 is connected.The emitter stage of described audion VT3 and transformation
The non-same polarity of the former limit inductance coil L3 of device T2 be connected while ground connection.The former limit inductance coil L3's of described transformator T2
Same Name of Ends is 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 control
The VCC pin of coremaking sheet U2 is 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 signal processing circuit 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 with and the second input all with feedback signal process
Circuit is connected.
As in figure 2 it is shown, this feedback signal processing circuit is by audion VT7, audion VT8, audion VT9, amplifier P1,
Amplifier P2, resistance R16, resistance R17, resistance R18, resistance R19, resistance R20, resistance R21, electric capacity C10, electric capacity C11, electric capacity
C12, diode D13, diode D14 and diode D15 form.
During connection, the positive pole of electric capacity C10 is connected with the emitter stage of audion VT7, the base stage phase of negative pole and audion VT8
Connect.The N pole of diode D13 positive pole with amplifier P2 after resistance R19 is connected, P pole ground connection.One end of resistance R17 with
The base stage of audion VT8 is connected, and other end P pole with diode D13 after resistance R18 is connected.One end of resistance R20 with
The negative pole of amplifier P2 is connected, other end ground connection.The negative pole of electric capacity C12 is connected with the positive pole of amplifier P2, positive pole and electricity
The junction point of resistance R17 and resistance R18 is connected.The P pole of diode D14 is connected with the N pole of diode D13, N pole and audion
The emitter stage of VT9 is connected.The positive pole of electric capacity C11 is connected with the N pole of diode D14, the positive pole phase of negative pole and amplifier P1
Connect.The N pole of diode D15 positive pole with amplifier P2 after resistance R21 is connected, P pole after resistance R16 with audion
The base stage of VT9 is connected.
The base stage of described audion VT7 is connected with the N pole of diode D10, the P pole phase of its emitter stage and diode D10
Connecting, its colelctor electrode is connected with the emitter stage of audion VT8.The colelctor electrode of described audion VT9 and the transmitting of audion VT8
Pole is connected, and its base stage is connected with the colelctor electrode of audion VT8.The negative pole of described amplifier P1 and the outfan of amplifier P2
Being connected, its outfan is then connected with second input of photoelectrical coupler A1.The outfan of described amplifier P2 and photoelectricity
The first input end of bonder A1 is connected.The positive pole of described electric capacity C12 is connected with the emitter stage of audion VT7.
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%.Feedback signal is processed by the present invention, it is to avoid feedback signal distortion,
Make the present invention preferably can adjust the pulsewidth of output voltage according to feedback signal, make output voltage more stable.
As it has been described above, just can well realize the present invention.
Claims (8)
1. a feedback signal processing-type PWM inverse-excitation type switch power-supply, it is characterised in that: main by control chip U2, 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, is connected with constant-current source circuit
The transformer rectifier circuit connect, the output circuit being connected with the secondary of transformator T2, the feedback signal being connected with output circuit
Process circuit, be serially connected in the feedback link between control chip U2 and feedback signal processing circuit, be serially connected in control chip U2 with
Switch triggering circuit between constant-current source circuit, positive pole is connected with the RT/CT pin of control chip U2, the electric capacity of minus earth
The diode D7 that 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, one end
Be connected with the CS pin of control chip U2, resistance R13 that the other end is then connected with switch triggering circuit, positive pole with control core
The COMP of the electric capacity C6 that the CS pin of sheet U2 is connected, negative pole is then connected with switch triggering circuit, negative pole and control chip U2
The electric capacity C5 that pin is connected, positive pole is connected with feedback link, the resistance R8 being in parallel with electric capacity C5, and one end and control
The GND pin of chip U2 is connected, the resistance R9 of other end ground connection composition；The VCC pin of described control chip U2 and constant-current source
Circuit is connected, its FB pin 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 is also connected with the REF pin of control chip U2.
A kind of feedback signal processing-type PWM inverse-excitation type switch power-supply the most according to claim 1, it is characterised in that: described
Feedback signal processing circuit is by audion VT7, audion VT8, audion VT9, amplifier P1, amplifier P2, positive pole and three poles
Electric capacity C10, the N pole that the emitter stage of pipe VT7 is connected, negative pole is connected with the base stage of audion VT8 after resistance R19 with amplification
The positive pole of device P2 is connected, the diode D13 of P pole ground connection, and one end is connected with the base stage of audion VT8, the other end is through resistance
The resistance R17 that is connected with the P pole of diode D13 after R18, one end is connected with the negative pole of amplifier P2, other end ground connection
Resistance R20, the electric capacity that negative pole is connected with the positive pole of amplifier P2, positive pole is connected with the junction point of resistance R17 and resistance R18
The diode D14 that C12, P pole is connected with the N pole of diode D13, N pole is connected with the emitter stage of audion VT9, positive pole with
The electric capacity C11 that the N pole of diode D14 is connected, negative pole is connected with the positive pole of amplifier P1, and N pole after resistance R21 with
The diode D15 composition that the positive pole of amplifier P2 is connected, P pole base stage with audion VT9 after resistance R16 is connected；Institute
The base stage stating audion VT7 is all connected with output circuit with emitter stage, its colelctor electrode is connected with the emitter stage of audion VT8
Connect；The colelctor electrode of described audion VT9 is connected with the emitter stage of audion VT8, the colelctor electrode phase of its base stage and audion VT8
Connect；The negative pole of described amplifier P1 is connected with the outfan of amplifier P2, the outfan of described amplifier P1 and amplifier
The outfan of P2 is all connected with feedback link；The positive pole of described electric capacity C12 is connected with the emitter stage of audion VT7.
A kind of feedback signal processing-type PWM inverse-excitation type switch power-supply the most according to claim 2, it is characterised in that: described
Transformer rectifier circuit is by transformator T1, diode rectifier U1, and positive pole and the former limit inductance coil L1's of transformator T1 is non-
The electric capacity C1 composition that Same Name of Ends is connected, negative pole then Same Name of Ends with the secondary inductance coil L2 of transformator T1 is connected；Described
The input of diode rectifier U1 respectively with Same Name of Ends and the secondary of transformator T1 of the former limit inductance coil L1 of transformator T1
The non-same polarity of inductance coil L2 is connected；The cathode output end of described diode rectifier U1 is connected with constant-current source circuit,
Its cathode output end ground connection.
A kind of feedback signal processing-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 field effect transistor MOS1, audion VT1, audion VT2, audion VT3, and negative pole is electric with the former limit of transformator T2
The Same Name of Ends of sense coil L4 is connected, the electric capacity C2 of plus earth, is just being serially connected in the drain electrode of field effect transistor MOS1 and electric capacity C2
The Zener diode 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 between pole
D1, is serially connected in the resistance R2 between emitter stage and the grid of field effect transistor MOS1 of audion VT1, and negative pole is with audion VT3's
The positive pole phase of electric capacity C3, the P pole that base stage is connected, positive pole base stage with audion VT1 after resistance R3 is connected and electric capacity C3
The Zener diode D2 that connection, N pole are connected with the grid of field effect transistor MOS1, is serially connected in the colelctor electrode of audion VT3 with steady
Pressure diode D2 N pole between resistance R4, P pole be connected with switch triggering circuit, N pole after resistance R5 with audion VT3
The diode D3 that is connected of colelctor electrode, and negative pole is connected with the N pole of diode D3, the N of positive pole and Zener diode D2
The electric capacity C4 composition that pole is connected；The grid of described field effect transistor MOS1 is connected with the cathode output end of diode rectifier U1
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.
A kind of feedback signal processing-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 is through inductance L6
N pole with diode D10 is collectively forming the Zener diode D11 of outfan, the resistance being in parallel with Zener diode D11 afterwards
R15, the electric capacity C9 that positive 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
The Zener diode D12 that N pole with Zener diode D11 is connected after inductance L6, P pole is connected with the N pole of diode D10
Composition；The Same Name of Ends of secondary inductance coil L5 of described transformator T2 is connected with the P pole of diode D10；Described diode D10
P pole be connected with the emitter stage of audion VT7, its N pole is connected with the base stage of audion VT7.
A kind of feedback signal processing-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 of control chip U2
Resistance R12, P pole between the grid of effect pipe MOS2 is connected with the source electrode of field effect transistor MOS2, N pole and audion VT5
The diode D8 that base stage is connected, positive pole is connected with the drain electrode of field effect transistor MOS2, negative pole after resistance R14 with audion
Electric capacity C8, the N pole that the emitter stage of VT6 is connected is connected with the grid of field effect transistor MOS2, the Zener diode of P pole ground connection
D6, 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
The grid of field effect transistor MOS2 CS pin with control chip U2 after resistance R13 is connected, its drain electrode the most respectively with electric capacity C6
Negative pole be connected with feedback link；The base stage phase of the grounded collector of described audion VT5, its emitter stage and audion VT6
Connect；The colelctor electrode of described audion VT6 is connected with the P pole of diode D3.
A kind of feedback signal processing-type PWM inverse-excitation type switch power-supply the most according to claim 6, it is characterised in that: described
Feedback link routing optocoupler A1, audion VT4, P pole second outfan with photoelectrical coupler A1 after resistance R10 is connected
Connect, diode D4 that N pole is connected with the positive pole of electric capacity C5, be serially connected in the REF pin of control chip U2 and the N pole of diode D4
Between resistance R6, and N pole is connected with the FB pin of control chip U2, P pole after resistance R7 with the current collection of audion VT4
The diode D5 composition that pole is connected；The emitter stage of described audion VT4 is connected with first outfan of photoelectrical coupler A1,
Its base stage is then connected with the drain electrode of field effect transistor MOS2；The first input end of described photoelectrical coupler A1 is defeated with amplifier P2's
Go out that end is connected, its second input then outfan with amplifier P1 is connected.
A kind of feedback signal processing-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.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610626657.8A CN106160494A (en) | 2016-08-02 | 2016-08-02 | A kind of feedback signal processing-type PWM inverse-excitation type switch power-supply |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109976439A (en) * | 2019-04-29 | 2019-07-05 | 苏州市职业大学 | High efficiency can multi-path flow equalizing constant-current source circuit |
| CN113030707A (en) * | 2021-03-12 | 2021-06-25 | 北京龙坤盛达科技有限公司 | Active trigger excitation signal fault positioning and diagnosis circuit device and method |
-
2016
- 2016-08-02 CN CN201610626657.8A patent/CN106160494A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109976439A (en) * | 2019-04-29 | 2019-07-05 | 苏州市职业大学 | High efficiency can multi-path flow equalizing constant-current source circuit |
| CN113030707A (en) * | 2021-03-12 | 2021-06-25 | 北京龙坤盛达科技有限公司 | Active trigger excitation signal fault positioning and diagnosis circuit device and method |
| CN113030707B (en) * | 2021-03-12 | 2023-06-06 | 北京龙坤盛达科技有限公司 | Active trigger excitation signal fault positioning and diagnosing circuit device and method |
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Effective date of registration: 20190417 Address after: 629200 Building No. 88 Hedong Avenue, Shehong County Economic Development Zone, Suining City, Sichuan Province Applicant after: Sichuan Pu Technology Co. Ltd. Address before: 610000 South Fourth Section of Second Ring Road, Chengdu High-tech Zone, Sichuan Province Applicant before: Chengdu zero or one wisdom Technology Co., Ltd. |
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Application publication date: 20161123 |