CN102148572A - Fixed voltage-second product feedback-free forward power module with multiplexed output - Google Patents
Fixed voltage-second product feedback-free forward power module with multiplexed output Download PDFInfo
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- CN102148572A CN102148572A CN 201110101747 CN201110101747A CN102148572A CN 102148572 A CN102148572 A CN 102148572A CN 201110101747 CN201110101747 CN 201110101747 CN 201110101747 A CN201110101747 A CN 201110101747A CN 102148572 A CN102148572 A CN 102148572A
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Abstract
The invention relates to a fixed voltage-second product feedback-free forward power module with multiplexed output, which belongs to the field of power supplies. The module is provided with an input circuit, and is characterized in that: the output end of the input circuit is connected with a starting circuit, a forward power conversion circuit, a fixed voltage-second product circuit and a control circuit; the output end of the starting circuit is connected with the fixed voltage-second product circuit and the control circuit; the control circuit controls the forward power conversion circuit; and the forward power conversion circuit is electrically connected with a first output circuit, a second output circuit and a third output circuit respectively. The module has a simple circuit structure, replaces a feedback loop by the fixed voltage-second product circuit for regulation, and greatly improves the reliability of the power supply.
Description
Technical field
The present invention relates to field of power supplies, at length say be a kind ofly be used to communicate by letter, the fixedly voltagesecond product in field such as computer do not have feedback multichannel output ortho-exciting electric source module.
Background technology
As everyone knows, along with science and technology development, to power supply no matter from electromagnetic compatibility still from aspects such as high reliability, more and more higher requirement is all arranged, wherein high reliability is extremely important for the customer, and optic coupling element occupies higher ratio as its failure rate of critical elements of feedback control loop, is to calculate the MTBF(mean free error time) time one of failure rate higher element.
Summary of the invention
In order to overcome the deficiencies in the prior art, the invention provides a kind of fixedly voltagesecond product does not have feedback multichannel output ortho-exciting electric source module, replaces the adjusting of feedback control loop with fixing voltagesecond product circuit, has improved the reliability of power supply greatly.
The technical solution adopted for the present invention to solve the technical problems is: a kind of fixedly voltagesecond product does not have feedback multichannel output ortho-exciting electric source module, be provided with input circuit, it is characterized in that the output termination start-up circuit, normal shock circuit for power conversion of input circuit, fixedly voltagesecond product circuit and control circuit, the output termination of start-up circuit is voltagesecond product circuit and control circuit fixedly, control circuit control normal shock circuit for power conversion, the normal shock circuit for power conversion is electrically connected with output circuit one, output circuit two and output circuit three respectively.
The present invention can realize that also input circuit is connected to 1 pin of main power transformer T1, C1 ground connection by following measure after the LC of L1, C1 filtering.
Start-up circuit does startup usefulness for the IC1 chip of model UC3842 from input through R1, R2, Q1 and voltage-stabiliser tube ZD1 output VCC voltage, and the 7 pin VCC end of IC1, voltage-stabiliser tube ZD1, C2, C3 ground connection are arrived in process C2, the smooth connection of C3 capacitor filtering.
Fixedly the input voltage of voltagesecond product circuit compares through the voltage 2.5V that R10, R11 divide through the 8 pin 5V end of resistance R 9 magnitude of voltage that charging obtains to C8 and IC1, control the size of duty ratio then through R46, C30, Q5, D3, C8, R11, C30 and Q5 grounded emitter, 4 pin, the 5 pin ground connection of the two voltage comparator LM393 of U1.
The R6 of control circuit is connected to 4 pin of IC1, again by 4 foot meridian capacitor C5 to the frequency of oscillation of IC1 is provided, 2 pin of C5 and IC1,5 pin ground connection, 6 pin of IC1 connect R5, D2, Q3, Q4, R4 formation totem is exported to MOSFET pipe Q2 provides drive signal, and the Q3 collector electrode meets VCC, Q4 grounded collector, over-current detection connects R47 by the L9 current transformer, be connected to 3 pin of IC1 through R8, C6, LC filtering, detect overcurrent, 1 pin of C6, R47 and L9,3 pin ground connection.
The normal shock power transfer is made of T1, Q2, L9, C4, and the drain electrode of C4 connection metal-oxide-semiconductor Q2 connects 5 pin of transformer T1 simultaneously, and the C4 other end connects 1 pin of transformer T1.
The L2 of output circuit one is a magnetic amplifier; D5; D14 is two Schottky diodes; D5 is used for rectification; D14 is used for afterflow; L3 is the normal shock inductance; C10; L4; C11 constitutes the filtering of ∏ type; C25 is used for filter away high frequency noise, C10; the minus earth of C11, C25 are ceramic disc capacitors; can any end ground connection; R13 is that a detection resistance is used to detect overcurrent protection, R14; R15; R16 forms voltage sampling circuit, adopt from the upper end of R15 voltage signal; be connected to 2 pin of U2A operational amplifier; with with auxiliary winding power supply through R18 current-limiting resistance and model be the 2.5V reference voltage that constitutes of the voltage-reference U3 of TL431 relatively, the plus earth of U3, R15; the end ground connection of R16; C12; R17 is a loop compensation network, constitutes a negative feedback.R19 one end ground connection, the upper end is connected to inverting input 6 pin of U2B, in-phase input end 5 pin of U2B are connected to output 1 pin of U2A by resistance R 21,5 pin of U2B are also received the left end of R13 by a resistance R 20 simultaneously, this road is used to detect the pressure reduction at the two ends of R13, and and the voltage that output 1 pin of U2A is come is superimposed, 6 pin with U2B compare then, 6 pin and 7 pin that R22 is connected to U2B constitute positive feedback, and Q6 is a PNP triode, and boost voltage is through the R25 current limliting, be connected to the emitter of Q6, be connected to the base stage of Q6 through resistance R 24, the Q6 collector electrode is connected to the right-hand member of magnetic amplifier L2 through D6, and another road is connected to the left end of R13 through D7.
The L5 of output circuit two is a magnetic amplifier; D8 is that a Schottky is to diode; one of them diode is rectification; another diode is afterflow; L6 is the normal shock inductance; C14; C31; L7; C15 constitutes the filtering of ∏ type; C14; the C31 parallel connection; C26 is used for filter away high frequency noise; C14; C31; the minus earth of C15; C26 is a ceramic disc capacitor; can any end ground connection; R44 is that a detection resistance is used to detect overcurrent protection; R26; R27; R28 forms voltage sampling circuit; adopt from the upper end of R27 voltage signal; be connected to 2 pin of U5A operational amplifier; with power through R30 current-limiting resistance and model with auxiliary winding is that the 2.5V reference voltage that TL431 voltage-reference U4 constitutes compares; the plus earth of U4; R27; the end ground connection of R28; C16; R29 is a loop compensation network, constitutes a negative feedback, R33 one end ground connection; the upper end is connected to 6 pin of the inverting input of U5B; 5 pin of the in-phase input end of U5B are connected to output 1 pin of U5A by resistance R 31, and 5 pin of U5B are also received the left end of R44 by a resistance R 32 simultaneously, and this road is used to detect the pressure reduction at the two ends of R44; and and the voltage that 1 pin of the output of U5A is come is superimposed; 6 pin with U5B compare then, and R34 is connected to 6 pin and 7 pin of U5B, constitute positive feedback; Q7 is a PNP triode; boost voltage is connected to the emitter of Q7 through the R37 current limliting, is connected to the base stage of Q7 through resistance R 36; collector electrode is connected to the right-hand member of magnetic amplifier L5 through D9, and another road is connected to the left end of R44 through D10.
Output circuit three is a synchronous BUCK circuit, model is that 12 pin of LM5115 limit adjustment controller IC 2 are the output of VCC voltage, the anode that connects D11 through C22 filtering then, the D11 negative electrode is connected to 15 pin of IC2, connect 13 pin of C23 then to IC2, this part is a boostrap circuit, 9 pin of IC2 are connected to 9 pin of T1 transformer by a resistance R 45, this road is a synchronous circuit, 8 pin of IC2 are by C18 ground connection, obtain a ramp voltage, model is that 7 pin of the IC2 of LM5115 pass through a capacitor C 19 ground connection, be soft starting circuit, 4 pin of IC2 and 5 pin link to each other, output for 6 pin and the 7 pin comparative voltages of IC2, R38, C21 is a compensating network, 5 pin and 6 pin that connect IC2, be the output pin and the feedback pin of internal amplifier, R39, R40 is the current-limiting resistance that height drives, connect 14 pin of IC2 and the grid of metal-oxide-semiconductor Q8 respectively, 11 pin of IC2 and the grid of metal-oxide-semiconductor Q9, L8 is the normal shock inductance, R41 is an over-current detection resistance, is connected respectively to 1 pin and 2 pin of IC2, C24, L10, C32 constitutes the filtering of ∏ type, the C27 filter away high frequency noise, R42, R43 is a sampling resistor, adopts to such an extent that voltage signal is connected to the 6 pin feedback ends of IC2 then from the resistance of R43 upper end, is used for the output of regulation voltage.
The invention has the beneficial effects as follows that circuit structure is simple, replace the adjusting of feedback control loop, improved the reliability of power supply greatly with fixing voltagesecond product circuit.
Description of drawings
The present invention is further described below in conjunction with drawings and Examples.
Fig. 1 is a schematic block circuit diagram of the present invention.
Fig. 2 is circuit theory diagrams of the present invention.
Fig. 3 is the A partial enlarged drawing one of Fig. 2 of the present invention.
Fig. 4 is the B partial enlarged drawing two of Fig. 2 of the present invention.
Fig. 5 is the C partial enlarged drawing three of Fig. 2 of the present invention.
1. start-up circuits among the figure, 2. normal shock circuit for power conversion, 3. output circuit one, and 4. output circuit two, and 5. output circuit three, 6. control circuit, 7. fixedly voltagesecond product circuit, 8. input circuit.
Embodiment
Among Fig. 1, the present invention is provided with input circuit 8, the output termination start-up circuit 1 of input circuit 8, normal shock circuit for power conversion 2, fixedly voltagesecond product circuit 7 and control circuit 6, the output termination of start-up circuit 1 is voltagesecond product circuit 7 and control circuit 6 fixedly, control circuit 6 control normal shock circuit for power conversion 2, normal shock circuit for power conversion 2 is electrically connected with output circuit 1, output circuit 24 and output circuit 35 respectively.
Among Fig. 2, input circuit of the present invention is made of L1, C1; Fixedly the voltagesecond product circuit is made of R9, C8, D3, D13, R10, R11, C9, R46, C30, Q5, U1; Control circuit is made of IC1, R6, C5, C6, C7, R5, D2, Q3, Q4, R4, R47, R8, the model of IC1 is UC3842, control circuit chips start-up circuit is made of R1, R2, Q1, C2, C3, ZD1, and self-powered circuit is made of D1, R3 and transformer self-powered winding; The normal shock power transfer is made of T1, Q2, L9, and clamp circuit is made of C4; Output circuit one is made of L2, D5, D14, L3, C10, L4, C11, C25, and the protective circuit of output circuit one (voltage stabilizing and overcurrent protection) is made of R13, R14, R15, R16, R17, C12, U2, R21, R19, R22, R23, Q6, D6, D7, R24, R25; Output circuit two is made of L5, D8, L6, C14, C31, L7, C15, C26, and the protective circuit of output circuit two (voltage stabilizing and overcurrent protection) is made of R26, R27, R28, R29, C16, R31, R33, R34, R35, Q7, R36, R37, D9, D10, R44, U5; Output circuit three and protective circuit thereof are made of R45, IC2, D11, C23, C22, C18, C19, C20, C21, R38, R39, R40, Q8, Q9, L8, R41, C24, L10, C32, C27, R42, R43; Secondary auxiliary power supply circuit is made of D12, C28, U6, C29, and the TC2 model is LM5115.
Input circuit is connected to 1 pin of main power transformer T1, C1 ground connection after the LC of L1, C1 filtering.Start-up circuit does startup usefulness for IC1 chip current model PWM controller UC3842CM from input through R1, R2, Q1 and voltage-stabiliser tube ZD1 output VCC voltage, and the 7 pin VCC end of IC1, voltage-stabiliser tube ZD1, C2, C3 ground connection are arrived in process C2, the smooth connection of C3 capacitor filtering.Fixedly voltagesecond product circuit input voltage compares through the voltage 2.5V that R10, R11 divide through the 8 pin 5V end of resistance R 9 magnitude of voltage that charging obtains to C8 and IC1, control the size of duty ratio then through R46, C30, Q5, D3, C8, R11, C30, Q5 grounded emitter, the two voltage comparators of U1B are one group of comparator among the LM393, form voltage follower and disturb 4 pin, the 5 pin ground connection of the two voltage comparator LM393 of U1 to avoid extraneous noise.4 pin that control circuit R6 is connected to IC1 connect the frequency of oscillation that IC1 is provided by the 4 foot meridian capacitor C5 of IC1 again, 2 pin of C5, IC1 and 5 pin ground connection, the IC16 pin connects R5, D2, Q3, Q4, R4 formation totem is exported to MOSFET pipe Q2 provides drive signal, the Q3 collector electrode meets VCC, Q4 grounded collector.Over-current detection connects R47 by the L9 current transformer, is connected to 3 pin of IC1 through R8, C6, LC filtering, detects overcurrent, 1 pin of C6, R47 and L9,3 pin ground connection.Magnetic reset adopts voltage clamp, and the drain electrode of C4 connection metal-oxide-semiconductor Q2 connects 5 pin of transformer T1 simultaneously, and the C4 other end connects 1 pin of transformer T1.
The L2 of output circuit one is a magnetic amplifier, D5, D14 are two Schottky diodes, D5 is used for rectification, D14 is used for afterflow, and L3 is the normal shock inductance, and C10, L4, C11 constitute the filtering of ∏ type, C25 is used for filter away high frequency noise, the minus earth of C10, C11, C25 are ceramic disc capacitors, can any end ground connection.R13 is that a detection resistance is used to detect overcurrent protection.R14, R15, R16 form voltage sampling circuit, adopt from the upper end of R15 voltage signal, be connected to 2 pin of U2A operational amplifier, with power through R18 current-limiting resistance and model with auxiliary winding is that the 2.5V reference voltage that TL431 voltage-reference U3 constitutes compares, the plus earth of TL431, the end ground connection of R15, R16.C12, R17 are loop compensation networks, constitute a negative feedback.R19 one end ground connection; the upper end is connected to inverting input 6 pin of U2B; in-phase input end 5 pin of U2B are connected to output 1 pin of U2A by resistance R 21; simultaneously 5 pin of U2B are also received the left end of R13 by a resistance R 20, and this road is used to detect the pressure reduction at the two ends of R13, and and output 1 pin of the U2A voltage of coming superimposed; 6 pin with U2B compare then; effect has two: the one, be used for overcurrent protection, and the 2nd, it also participates in the adjusting of magnetic amplifier simultaneously, is its part.R22 is connected to 6 pin and 7 pin of U2B, constitutes positive feedback, and Q6 is a PNP triode, boost voltage is connected to the emitter of Q6 through the R25 current limliting, is connected to the base stage of Q6 through resistance R 24, collector electrode is connected to the right-hand member of magnetic amplifier L2 through D6, and another road is connected to the left end of R13 through D7.On the whole, this part plays voltage stabilizing U2A, and this part plays the effect of overcurrent protection U2B.
The L5 of output circuit two is a magnetic amplifier, D8 is that a Schottky is to diode, one of them diode is rectification, and another diode is afterflow, and L6 is the normal shock inductance, C14, C31, L7, C15 constitute the filtering of ∏ type, C14, C31 parallel connection, C26 is used for filter away high frequency noise, the minus earth of C14, C31, C15, C26 is a ceramic disc capacitor, can any end ground connection.R44 is that a detection resistance is used to detect overcurrent protection.R26, R27, R28 form voltage sampling circuit, adopt from the upper end of R27 voltage signal, be connected to 2 pin of U5A operational amplifier, with power through R30 current-limiting resistance and model with auxiliary winding is that the 2.5V reference voltage that TL431 voltage-reference U4 constitutes compares, the plus earth of TL431, the end ground connection of R27, R28.C16, R29 are loop compensation networks, constitute a negative feedback.R33 one end ground connection; the upper end is connected to 6 pin of the inverting input of U5B; in-phase input end 5 pin of U5B are connected to 1 pin of the output of U5A by resistance R 31; simultaneously 5 pin of U5B are also received the left end of R44 by a resistance R 32, and this road is used to detect the pressure reduction at the two ends of R44, and and output 1 pin of the U5A voltage of coming superimposed; 6 pin with U5B compare then; effect has two: the one, be used for overcurrent protection, and the 2nd, it also participates in the adjusting of magnetic amplifier simultaneously, is its part.R34 is connected to 6 pin and 7 pin of U5B, constitutes positive feedback, and Q7 is a PNP triode, boost voltage is connected to the emitter of Q7 through the R37 current limliting, is connected to the base stage of Q7 through resistance R 36, collector electrode is connected to the right-hand member of magnetic amplifier L5 through D9, and another road is connected to the left end of R44 through D10.On the whole, this part plays voltage stabilizing U5A, and this part plays the effect of overcurrent protection U5B.
Output circuit three is a synchronous BUCK circuit, model is that 12 pin of LM5115 limit adjustment controller IC 2 are the output of VCC voltage, the anode that connects D11 through C22 filtering then, the D11 negative electrode is connected to 15 pin of IC2, connect 13 pin of C23 then to IC2, this part is a boostrap circuit, 9 pin of IC2 are connected to 9 pin of T1 transformer by a resistance R 45, this road is a synchronous circuit, 8 pin of IC2 arrive ground by C18, obtain a ramp voltage, 7 pin of IC2 to ground, are soft starting circuit by a capacitor C 19,4 pin of IC2 and 5 pin link to each other, 6 pin for IC2, the output of 7 pin comparative voltages, R38, C21 is a compensating network, connects 5 pin of IC2,6 pin, be the output pin and the feedback pin of internal amplifier, R39, R40 is the current-limiting resistance that height drives, and connects 14 pin of IC2 and the grid of metal-oxide-semiconductor Q8 respectively, 11 pin of IC2 and the grid of metal-oxide-semiconductor Q9.L8 is the normal shock inductance, R41 is an over-current detection resistance, be connected respectively to 1 pin, 2 pin of IC2, C24, L10, C32 constitute the filtering of ∏ type, the C27 filter away high frequency noise, R42, R43 are sampling resistor, adopt to such an extent that voltage signal is connected to the 6 pin feedback ends of IC2 then from the resistance of R43 upper end, are used for the output of regulation voltage.
The D12 rectification of auxiliary power supply circuit, by the C28 capacitor filtering, U6 is a three terminal regulator then, voltage stabilizing 12V then through the C29 filter away high frequency noise, obtains stable 12V, the minus earth of C28, " GND " pin of U6 connects ground.
Claims (9)
- One kind fixedly voltagesecond product do not have feedback multichannel output ortho-exciting electric source module, be provided with input circuit, it is characterized in that the output termination start-up circuit, normal shock circuit for power conversion of input circuit, fixedly voltagesecond product circuit and control circuit, the output termination of start-up circuit is voltagesecond product circuit and control circuit fixedly, control circuit control normal shock circuit for power conversion, the normal shock circuit for power conversion is electrically connected with output circuit one, output circuit two and output circuit three respectively.
- 2. do not have feedback multichannel output ortho-exciting electric source module according to the described fixedly voltagesecond product of claim 1, it is characterized in that said input circuit is connected to 1 pin of main power transformer T1, C1 ground connection after the LC of L1, C1 filtering.
- 3. there is not feedback multichannel output ortho-exciting electric source module according to the described fixedly voltagesecond product of claim 1, it is characterized in that said start-up circuit is done for the IC1 chip to start through R1, R2, Q1 and voltage-stabiliser tube ZD1 output VCC voltage from input uses, hold voltage-stabiliser tube ZD1, C2, C3 ground connection through C2, the smooth connection of C3 capacitor filtering to the 7 pin VCC of the IC1 of model UC3842.
- 4. there is not feedback multichannel output ortho-exciting electric source module according to the described fixedly voltagesecond product of claim 1, the input voltage that it is characterized in that said fixedly voltagesecond product circuit compares through the voltage 2.5V that R10, R11 divide through the 8 pin 5V end of resistance R 9 magnitude of voltage that charging obtains to C8 and IC1, control the size of duty ratio then through R46, C30, Q5, D3, C8, R11, C30 and Q5 grounded emitter, 4 pin, the 5 pin ground connection of the two voltage comparator LM393 of U1.
- 5. there is not feedback multichannel output ortho-exciting electric source module according to the described fixedly voltagesecond product of claim 1, it is characterized in that the R6 of said control circuit is connected to 4 pin of IC1, again by 4 foot meridian capacitor C5 to the frequency of oscillation of IC1 is provided, 2 pin of C5 and IC1,5 pin ground connection, 6 pin of IC1 connect R5, D2, Q3, Q4, R4 formation totem is exported to MOSFET pipe Q2 drive signal is provided, the Q3 collector electrode meets VCC, Q4 grounded collector, over-current detection connects R47 by the L9 current transformer, through R8, C6, LC filtering is connected to 3 pin of IC1, detect overcurrent, C6,1 pin of R47 and L9,3 pin ground connection.
- 6. there is not feedback multichannel output ortho-exciting electric source module according to the described fixedly voltagesecond product of claim 1, it is characterized in that said normal shock power transfer is made of T1, Q2, L9, C4, the drain electrode of C4 connection metal-oxide-semiconductor Q2 connects 5 pin of transformer T1 simultaneously, and the C4 other end connects 1 pin of transformer T1.
- 7. there is not feedback multichannel output ortho-exciting electric source module according to the described fixedly voltagesecond product of claim 1; the L2 that it is characterized in that said output circuit one is a magnetic amplifier; D5; D14 is two Schottky diodes; D5 is used for rectification; D14 is used for afterflow; L3 is the normal shock inductance; C10; L4; C11 constitutes the filtering of ∏ type; C25 is used for filter away high frequency noise; C10; the minus earth of C11; C25 is a ceramic disc capacitor; can any end ground connection; R13 is that a detection resistance is used to detect overcurrent protection; R14; R15; R16 forms voltage sampling circuit; adopt from the upper end of R15 voltage signal; be connected to 2 pin of U2A operational amplifier; with with auxiliary winding power supply through R18 current-limiting resistance and model be the 2.5V reference voltage that constitutes of the voltage-reference U3 of TL431 relatively; the plus earth of U3; R15; the end ground connection of R16; C12; R17 is a loop compensation network; constitute a negative feedback; R19 one end ground connection; the upper end is connected to inverting input 6 pin of U2B; in-phase input end 5 pin of U2B are connected to output 1 pin of U2A by resistance R 21; 5 pin of U2B are also received the left end of R13 by a resistance R 20 simultaneously; this road is used to detect the pressure reduction at the two ends of R13; and and the voltage that output 1 pin of U2A is come is superimposed; 6 pin with U2B compare then; 6 pin and 7 pin that R22 is connected to U2B constitute positive feedback, and Q6 is a PNP triode, and boost voltage is through the R25 current limliting; be connected to the emitter of Q6; be connected to the base stage of Q6 through resistance R 24, the Q6 collector electrode is connected to the right-hand member of magnetic amplifier L2 through D6, and another road is connected to the left end of R13 through D7.
- 8. there is not feedback multichannel output ortho-exciting electric source module according to the described fixedly voltagesecond product of claim 1; the L5 that it is characterized in that said output circuit two is a magnetic amplifier; D8 is that a Schottky is to diode; one of them diode is rectification; another diode is afterflow; L6 is the normal shock inductance; C14; C31; L7; C15 constitutes the filtering of ∏ type; C14; the C31 parallel connection; C26 is used for filter away high frequency noise; C14; C31; the minus earth of C15; C26 is a ceramic disc capacitor; can any end ground connection; R44 is that a detection resistance is used to detect overcurrent protection; R26; R27; R28 forms voltage sampling circuit; adopt from the upper end of R27 voltage signal; be connected to 2 pin of U5A operational amplifier; with power through R30 current-limiting resistance and model with auxiliary winding is that the 2.5V reference voltage that TL431 voltage-reference U4 constitutes compares; the plus earth of U4; R27; the end ground connection of R28; C16; R29 is a loop compensation network; constitute a negative feedback; R33 one end ground connection; the upper end is connected to 6 pin of the inverting input of U5B; 5 pin of the in-phase input end of U5B are connected to output 1 pin of U5A by resistance R 31; 5 pin of U5B are also received the left end of R44 by a resistance R 32 simultaneously; this road is used to detect the pressure reduction at the two ends of R44, and and 1 pin of the output of the U5A voltage of coming superimposed, then with 6 pin of U5B relatively; R34 is connected to 6 pin and 7 pin of U5B; constitute positive feedback, Q7 is a PNP triode, and boost voltage is through the R37 current limliting; be connected to the emitter of Q7; be connected to the base stage of Q7 through resistance R 36, collector electrode is connected to the right-hand member of magnetic amplifier L5 through D9, and another road is connected to the left end of R44 through D10.
- 9. there is not feedback multichannel output ortho-exciting electric source module according to the described fixedly voltagesecond product of claim 1, it is characterized in that said output circuit three is a synchronous BUCK circuit, model is that 12 pin of LM5115 limit adjustment controller IC 2 are the output of VCC voltage, the anode that connects D11 through C22 filtering then, the D11 negative electrode is connected to 15 pin of IC2, connect 13 pin of C23 then to IC2, this part is a boostrap circuit, 9 pin of IC2 are connected to 9 pin of T1 transformer by a resistance R 45, this road is a synchronous circuit, 8 pin of IC2 are by C18 ground connection, obtain a ramp voltage, 7 pin of IC2 are by a capacitor C 19 ground connection, be soft starting circuit, 4 pin of IC2 and 5 pin link to each other, output for 6 pin and the 7 pin comparative voltages of IC2, R38, C21 is a compensating network, 5 pin and 6 pin that connect IC2, be the output pin and the feedback pin of internal amplifier, R39, R40 is the current-limiting resistance that height drives, connect 14 pin of IC2 and the grid of metal-oxide-semiconductor Q8 respectively, 11 pin of IC2 and the grid of metal-oxide-semiconductor Q9, L8 is the normal shock inductance, R41 is an over-current detection resistance, be connected respectively to 1 pin and 2 pin of IC2, C24, L10, C32 constitutes the filtering of ∏ type, C27 filter away high frequency noise, R42, R43 is a sampling resistor, adopt to such an extent that voltage signal is connected to the 6 pin feedback ends of IC2 then from the resistance of R43 upper end, be used for the output of regulation voltage.
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| Application Number | Priority Date | Filing Date | Title |
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| CN 201110101747 CN102148572A (en) | 2011-04-22 | 2011-04-22 | Fixed voltage-second product feedback-free forward power module with multiplexed output |
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| Application Number | Priority Date | Filing Date | Title |
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| CN 201110101747 CN102148572A (en) | 2011-04-22 | 2011-04-22 | Fixed voltage-second product feedback-free forward power module with multiplexed output |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103197557A (en) * | 2013-03-27 | 2013-07-10 | 首都师范大学 | Real-time monitoring closed-loop control system and working method thereof |
| CN104901560A (en) * | 2015-06-24 | 2015-09-09 | 航天长峰朝阳电源有限公司 | High-frequency switch power supply converter employing magnetic amplification technology |
| CN104917403A (en) * | 2015-05-25 | 2015-09-16 | 张家港市华为电子有限公司 | Automatic switching circuit in power supply applicable to 220V and 110V power grids |
-
2011
- 2011-04-22 CN CN 201110101747 patent/CN102148572A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103197557A (en) * | 2013-03-27 | 2013-07-10 | 首都师范大学 | Real-time monitoring closed-loop control system and working method thereof |
| CN104917403A (en) * | 2015-05-25 | 2015-09-16 | 张家港市华为电子有限公司 | Automatic switching circuit in power supply applicable to 220V and 110V power grids |
| CN104901560A (en) * | 2015-06-24 | 2015-09-09 | 航天长峰朝阳电源有限公司 | High-frequency switch power supply converter employing magnetic amplification technology |
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Application publication date: 20110810 |