TWM254821U - Synchronous rectification circuit having static adjustment - Google Patents

Description

M254821 IV. Creation Description α) [Technical Field of New Type] A synchronous rectifier circuit with static time adjustment (2), especially about the same + rectifier circuit with static time adjustment used in flyback power supply . 7 [Previous technology] According to the current known DC power supply devices, such as AC To DC SWlitching Power Supply, to reduce the size of the J transformer, most of them use high-frequency pulse width modulation. (Λ system DC output voltage, as shown in the first figure, is a schematic circuit diagram of a conventional flyback circuit. The transformer T 丨 divides the circuit into a 4, and the preceding circuit 1 〇 丨 and the secondary side Level circuit 丨 〇2, the primary side 1 〇 ^ spot, the secondary side 1 〇 2 is connected with a photoelectric crystal i 丨 丨 and a photodiode [= 忒: secondary side 1 〇1 and the secondary side i 〇2's electrical signal, but it can benefit 77 to feedback the secondary side ’s voltage or current output change signal to 5 arms at a time ^ Same as ΐ Adjust this—the voltage and current changes of the secondary side 101 and the secondary side 102 ' Li or f is used as the feedback signal for overcurrent and short-circuit protection. In the conventional art, the flyback voltage is converted into the first circuit, which is the circuit of the voltage output of the direct current machine. The principle is as follows: the energy of the ^% effect transistor Q 丨 when it is turned on is caused by the primary and secondary ^ poles of the transformer. The field effect transistor Q2 of the secondary side 102 cannot be turned on, and the stored phase S = Γ. After the field effect transistor Q1 is turned on, the transformer t uA at ^ = the secondary side i Q2 of the field effect transistor Q2 continues to turn on. The stored energy stored in the transformer T1 is generated and released. The conventional flyback power supply, which is known in the above description, is caused by the pulse.

M254821 Creation Instructions (2) The duty cycle of PWM width control (such as seven cycles) for controlling the DC output voltage is not fixed, causing the field effect transistor Q1 and the field effect transistor 117 to have a dead time at the time of cutoff. Fixed, making the utilization of crystal Q2 poor. At the same time, the field-effect transistor Q1 and the field-effect transistor Q2 are switched on and off lately, which makes the field-effect transistor Q1 and the field-effect transistor Q2 to produce two 'two =' simultaneous conduction (ON), resulting in circuit switching. Loss, and its switching loss is greater at the output voltage, causing the field-effect transistor Q 2 毁 to burn out. Do n’t U ..., therefore, a simple synchronous rectifier power supply ’disclosed in the Republic of China Patent 5 1 9 78 9’ can be connected to

The secondary side is used to obtain the output load current, and then two = two L. The current comparison action of the comparator is used to drive the synchronous switching power. The simple flyback synchronous rectifier power supply, The gate ^ ^ said that the dead time (Dead Time) will change with the input voltage of the transformer, and it is quite unstable. When the voltage is low, the dead time is short. When the voltage is high, the dead time is long. So, the utilization rate of the synchronous switch under high voltage will be τι. Because the current ratior is composed of iron core and coil. Therefore, the helmet method & ° is integrated. New content of wind biting circuit product] In view of this, this creation provides a Tongniu Road No. 6 with static time adjustment (2), which can adjust the dead time, and the dead time after v mechanical and electrical (Dead Time) is Fixed, can be used to improve ^ =

M254821 Electric Regeneration, Electric Setting, and Creation Instructions (3) _ The influence of the road due to the instability of the static time (.: This work has the static time Ti me). The formation-control product synchronous rectification circuit can also be used to reduce the size of the product. (IC), in order to reduce the cost of the industry, this production has a static time adjustment. The synchronous supply rectification of the source supplier is a two-volt integrated circuit. It is used in the flyback secondary side, a capacitor, and the two production systems are connected to one. Transformers include: rectifier circuit, charger: power supply and -th-electronic switch, circuit and logic circuit. The voltage regulator circuit, trigger circuit, and comparator 1 and 2 are connected to the transformer. The secondary voltage rectifier wheel on the second side is connected to the secondary side. The transformer is connected to the rectifier circuit to generate half-cycle voltage. . Charging circuit $ voltage. The voltage stabilizing circuit is connected to the charging voltage and the second charging J! For generating a reference voltage. Touch ::, and with the first-charge :: rush signal] and match the second; with a half-cycle voltage to generate I alum number. The comparison circuit is connected to the voltage regulator to output a dead-time adjustment, which compares the reference voltage with the dead-time adjustment, the charging circuit, and the triggering date: the dimming signal. The logic circuit is connected to the Bierhan signal, which is used to output a static adjustment signal and the positive half-cycle voltage, and the circuit and rectifier circuit will be a logical operation that will output a first drive signal to control the first electric ND). Using the above description, this creation has the opening and closing of the time adjustment switch. In order to adjust the R and slave of the charging circuit, the synchronous rectifier circuit with r can be dead time, and a fixed number can be used to adjust the time of the circuit switch operation (D ead ΐ ime M254821 IV. Creation instructions (4 )). At the same time, the dead time (Dead T i me) will not be affected by the instability of the duty cycle of the DC output voltage controlled by the PWM, which will improve the dead time of the conventional circuit. The instability caused by the first electronic switch is low and easy to burn. [Embodiment] Please refer to the second figure, which is a circuit diagram of the flyback power supply device used in this creation. The creation is connected to the secondary side Tr1 of a transformer Tr, a capacitor C3, an output power Vo and a first electronic switch SW1, including: a rectifier circuit 10, a charging circuit 1 2, a voltage regulator Circuit 14, a trigger circuit 16, a comparison circuit 18, and a logic circuit 17. Please refer to the second figure, where the rectifier circuit 10 is connected to the secondary side T r 1 terminal of the transformer Tr, and the alternating voltage provided by the secondary side T r 1 terminal is rectified to output a positive half-cycle voltage HV. The half-cycle voltage Η V is transmitted to the charging circuit 12 connected to the rectifying circuit 10. The charging circuit 12 includes a first charging unit 120 and a second charging unit 122. The first charging unit 120 is connected to the rectifying circuit 1. 0, and the charging operation is performed by the positive half-cycle voltage Η V to output a first charging voltage CV1. The second charging unit 122 is connected to the first charging unit 120 and performs a charging operation by the first charging voltage CV1 to output a second charging voltage CV2. In the above description, the charging circuit 12 is an RC charging circuit, and the rectifying circuit 10 is composed of at least one diode. As described above, the voltage stabilization circuit 14 is connected to the charging circuit 12 and receives the first charging voltage CV1 and performs the voltage stabilization operation according to the first charging voltage CV1.

Page 9 M254821 4. Creation Instructions (5) | Works to generate a stable reference voltage VR1. The trigger circuit 16 is connected to the rectifier circuit 10 and the charging circuit 12 and performs a trailing edge trigger action based on the positive half-cycle voltage to output a pulse signal ps. The pulse signal ps is used to drive a transistor switch to be turned on, so that the voltage potential of the second charging voltage c v 2 drops to zero potential. By comparing the pulse signal ps with the second charging voltage CV2, the comparison signal s 丨 is output as a static adjustment. The comparison circuit 丨 8 (+) is connected to the voltage stabilization circuit 14, the negative input terminal (-) is connected to j and the signal si, and H6 'is connected, and the reference voltage VR1 is compared with the static adjustment | 0CS. The comparison is different, it is used to output a static adjustment signal, and ~ Μ I 1 0 is used to connect the T, shape circuit 1 3 to the output power source Vo and the rectifier circuit Lei 17 to k half-cycle voltage M shaping output Into a shaping voltage DV. Logic | No. Ocs disk shaping fast comparison circuit 18 and shaping circuit 13 are the logical operation of AND between the first and the second driving voltage DV of the static adjustment signal to output the _ Gong number and send it to the connection logic One of the driving circuits 15 of the circuit 17 receives the first driving signal and generates a control signal CS1 ′ to control the opening and closing of the first electronic switch SW1. The same H: diagram, refer to the third diagram 'This is a schematic diagram of the circuit with the M2 e Γ body adjusted at rest for this creation. It is the voltage regulator circuit H, the trigger circuit =; 18, the shaping circuit 13, the logic circuit 17, and the driver. Electricity = I to ^ includes: · 'Integrated Circuit (iC) 2. As shown in the third figure, its pins, two power pins v to the first power pin Vcc, a ground pin GND, a first GATEy cc2, a charging input pin R / C, and a first output pin

Page 10 M254821

Please refer to No.-.. ^ Figure of the Chi-type power supply for library installation, refer to the fourth figure, which is used for the creation of the return axis t, and the vertical axis is the ± circuit waveform diagram of the electric scale. Among them, the horizontal axis system is the time Trl end system of the secondary side ί J = = V. At time, when the transformer Tr 2 is 踗 1 fi 祎, the positive potential voltage is given to the rectifier circuit 10, and then, after the autumn, the potential voltage is rectified to output a positive half-cycle voltage of high potential. To the shaping circuit 13, the shaping voltage is equal to the shaping voltage logic potential. Please refer to the charging voltage? 2 ^: The reference voltage VR1 output from the circuit 14 has a potential greater than "” 比较 Comparison of the static time generated by the trigger voltage · 16 output: = So the reference voltage VR1 adjusts the comparison signal with the static time; after the comparison operation of the comparison circuit No. 18, the comparison circuit ⑽ output-high power is set; the adjustment signal is 0CS. The static adjustment signal 0cs and the shaping circuit 丨 the shaping voltage DV is transmitted to the logic circuit i7, and the logic circuit i7 is a logical operation of the AND operation of the static, integer, signal oc and the shaping circuit DV, and the adjustment A high-potential first driving signal controls the driving circuit 5 and the driving circuit generates a first potential-controlling signal cs 丨 which is used to drive the first electrical 5-series SW1 to be turned on. In addition, because the primary and secondary sides of the transformer Tr 1 have opposite polarities, the induced voltages on the two sides have opposite polarities. Therefore, at this time, the second electronic switch SW2 on the primary side receives a low potential second Control = 'CS2, is off. . Blindly please cooperate with the second picture 'Refer to the fourth picture, at time 11-12, the positive side of Tr 1 of the secondary side of r Qing device Tr still provides a positive potential voltage to the rectifier circuit M254821, creative instructions (7) 1 0' Therefore, the rectified current @! 〇 is the positive half-cycle voltage HV that sets the positive voltage, and then the high-potential positive half-cycle voltage shaping circuit 13, at this time, the shaping circuit ⑽ outputs-a stable and high-voltage shaping voltage DV, And the shaping voltage Dv is transferred to the logic circuit 1. At this time, the reference voltage VR1 output by the voltage stabilization circuit i 4 is charged by the charging circuit 12 with the trigger voltage. The static time adjustment ratio generated by the output is: The voltage VR1 is the same as the static adjustment comparison signal si. After the comparison operation of the comparison circuit 18, the comparison circuit i 8 outputs a low-broadband adjustment signal ocs. The timing adjustment signal 0cs and the shaping voltage of the whole circuit-recognition signal DV are transmitted to the logic circuit 1 7 乂 circuit 1 3 rounds of the shaping signal OCS and the shaping voltage Dv and (aND) logic operation ^ will know the timing adjustment A low-potential first driving signal controls the driving circuit i 5, 2 to generate a low-potential first driving signal CS1 to drive the thunder '. The 15 series SW1 is turned off. The sub-switch also has the opposite polarity of the voltage induced on both sides due to the polarity of the primary side and the secondary side of the transformer Tr1. Therefore, the second electronic switch SW2 on the opposite side receives a second low-potential w Γ ~ secondary system. Still off. C S 2. In the above description, at time t2, the trigger voltage @ 16 series voltage HV is used for trailing edge triggering 'to generate a pulse signal ps. 2 positive half cycle The impulse signal PS is to step down the second charging voltage CV2 to zero electricity% instant 'pulse. Adjust the comparison signal S1 to zero potential. " ‘When it ’s quiet, please cooperate with the second picture’ and refer to the fourth picture. At time ΐ2_, the secondary side of the voltage transformer Tr provides a negative potential voltage to the rectifier circuit.

M254821

IV. Creation Note (8) Therefore, the rectifier circuit 10 rectifies and outputs the negative potential voltage to a low positive half-cycle voltage HV, and then, the low-potential positive half-cycle voltage HV is transmitted to the circuit 13, and at the same time, the shaping circuit 13 series outputs a stable output. And it is a low-shaped voltage DV, and transmits the shaped voltage DV to the logic circuit 17. At this time, at time t2, the pulse signal ps # steps down the static signal si to a potential of zero. Therefore, the voltage VR1 output by the voltage stabilization circuit 14 is charged? It is higher than the static time adjustment comparison signal S1 generated by the charging circuit 12 and the trigger circuit ′ output. The reference voltage VRl is adjusted with the static time. After the comparison signal is strictly compared with the comparison voltage @ 18, the comparison circuit 18 = input = the same time adjustment signal OCS. The reshaping voltage output by the OCS disk shaping circuit 13 in the static time adjustment signal is the transmission circuit 17 and the logic adjustment is performed in the static time adjustment signal Ω Γ Γ ε r 中 广 η 电 丨 丨 料 料 料 料 料 料 料 料 料 料 料 料 料 料 （（and AND ) Of 15, 'Drive circuit 15 is generated: dynamic = control drive circuit to drive the first control signal csi of the-electronic switch m wearing stop potential, so the polarity of the primary side and secondary side of the voltage transformer Tr1 is opposite', so that The voltages sensed on both sides of the polarities are on the second wide electronic switch ㈣ receiving a high potential for the second time = 2 'is in the on state. Then, the author adjusts it at rest: ^ The waveform of each end of the circuit, in time t3_t =

The waveform of time is as described above in order.卩 Repeated though! Day to day tO-U First ^: Refer to the fourth picture 'where at time tl-t2, ㈣swi and the second electronic switch SW2 are sad, so at this time ask the total & & ap Dead time is the dead time of the circuit (Dead Time M254821 IV. Creation Note (9) The "Dead Time" in the above description as shown in Figure 4) is the reference voltage VR1 and the dead time adjustment comparison signal S1 Related. Therefore, with the reference voltage VR1 fixed, the R and c values of the second charging unit 122 are adjusted to adjust the charging time of the second charging voltage CV2, and at the same time, the slope of the comparative signal si is adjusted at rest. Dead time 〇 As mentioned above, this creative system can adjust the dead time τ of the circuit switch by adjusting the R and C values of the second charging unit ΐ22 'and fix the dead time (Dead Time ). At the same time, the static time (IT, will not be affected by the instability of the pulse width modulation (PWM) control DC input nii: nt (dUtyCyCle)), and then the utilization of the sub-switch is low and the (-H Jlme) is unstable. Causes the shortcomings of the first electric low and easy to burn. Ten 隹, using the huhujin ;, detailed description and figure < The spirit of the scope of the patent is not to be acquainted with the artist in this book: "Yi should be included in the scope of this creation. Any decoration can be covered in the following works, and changes or revisions can be easily considered. The scope of patents.

Page 25 M254821 Brief Description of the Schematic Diagram (1) Schematic Diagram The first diagram is a circuit diagram of a conventional flyback power supply device; the second diagram is a circuit diagram of a creative flyback power supply device; the third The figure is the schematic diagram of the synchronous rectifier integrated circuit with static adjustment; and the fourth figure is the circuit waveform of the flyback power supply device.

(2) Description of drawing number Know: T1 transformer 1 0 1 pre-stage circuit 1 0 2 post-stage circuit 111 photoelectric crystal 1 1 2 photodiode Q1 field effect transistor Q 2 field effect transistor

Tr transformer

Tr 1 Transformer Tr secondary side 1 0 Rectifier circuit 1 2 Charging circuit 120 First charging unit 122 Second charging unit

Page 15 M254821 Simple diagram description 1 3 Shaping circuit 1 4 Voltage regulator circuit 1 5 Drive circuit 1 6 Trigger circuit 1 7 Logic circuit 1 8 Comparison circuit Vo output power C3 capacitor

SW1 first electronic switch SW2 second electronic switch CV1 first charging voltage CV2 second charging voltage PS pulse signal S 1 adjustment signal at rest VR1 reference voltage 0CS adjustment signal at rest DV shaping voltage HV positive half cycle voltage CS1 first control signal CS 2 second control signal Vcc first power pin GND ground pin Vcc2 second power pin R / C charging input pin

P.16 M254821 Schematic description of GATE first output pin 2 Control integrated circuit (I C) mill P.17

Claims (1)

M254821 V. Application scope 1. A synchronous rectifier circuit with static time adjustment (2), which is connected to the secondary side of a transformer, a capacitor, an output power source and a first electronic switch, including: a rectifier The circuit is connected to the secondary side of the transformer and rectifies and outputs the alternating voltage of the secondary side of the transformer into a positive half-cycle voltage; a charging circuit connected to the rectifying circuit generates a first charging voltage and a first Two charging voltages; a voltage stabilizing circuit connected to the charging circuit to receive the first charging voltage to generate a reference voltage; a trigger circuit connected to the rectifying circuit and the charging circuit to generate a pulse signal, And the pulse signal is matched with the second charging voltage to output a comparison signal for static adjustment; a comparison circuit connected to the voltage stabilization circuit, the charging circuit and the trigger circuit compares the reference voltage with the static adjustment; A signal for generating a static adjustment signal; a logic circuit connected to the comparison circuit and the rectifier circuit, Signal and the adjustment voltage for the positive half cycle and (AND) of the logic operation, outputting a first driving signal for controlling opening and closing of the first electronic switch. 2. The synchronous rectification circuit with static time adjustment as described in item 1 of the scope of patent application (2), wherein the charging circuit includes: a first charging unit connected to the rectification circuit for outputting the first Charging voltage; and a second charging unit connected to the first charging unit for outputting Page 18 M254821 V. Patent application scope The second charging voltage. 3. The synchronous rectification circuit (2) with static time adjustment as described in item 1 of the scope of patent application, which further includes a shaping circuit connected to the rectification circuit and the logic circuit, and the positive half-cycle voltage shaping output is converted into one. The voltage is shaped and transmitted to the logic circuit. 4. The synchronous rectifier circuit (2) with static time adjustment as described in item 1 of the scope of patent application, which further includes a driving circuit connected to the logic circuit and the first electronic switch to receive the first driving signal. A first control signal is generated to control the opening and closing of the first electronic switch. 5. The synchronous rectifier circuit with static adjustment as described in item 1 of the scope of patent application (2), wherein the charging circuit is an RC charging circuit. 6. The synchronous rectifier circuit with static adjustment as described in item 1 of the scope of patent application (2), wherein the rectifier circuit is composed of at least one diode. 7. The synchronous rectifier circuit with static time adjustment as described in item 1 of the scope of patent application (2), wherein the voltage stabilization circuit, the trigger circuit, the comparison circuit and the logic circuit can be packaged into a control product. Circuit (IC), the control integrated circuit (IC) includes at least the following pins: a first power pin, a ground pin, a second power pin, a charging input pin, and a first output pin foot. 8 · — A synchronous rectifier circuit (2) with static time adjustment, which is connected to the secondary side of a transformer, an output power source and a first electronic switch, and includes a rectifier circuit connected to the secondary side of the transformer. The output is a positive half-cycle voltage; Page 25 M254821 V. Patent application scope A charging circuit connected to the rectifier circuit; a voltage stabilization circuit connected to the charging circuit to output a reference voltage; a trigger circuit connected to the rectifier circuit and the charging circuit To generate a pulse signal; a comparison circuit connected to the voltage stabilization circuit, the charging circuit and the trigger circuit to generate a static adjustment signal; and a logic circuit connected to the comparison circuit and the rectification circuit For outputting a first driving signal to control the opening and closing of the first electronic switch. 9. The synchronous rectifier circuit (2) with static time adjustment as described in item 8 of the scope of patent application, wherein the logic circuit performs a logical operation (AND) between the static time adjustment signal and the positive half-cycle voltage. 10. The synchronous rectifier circuit with static time adjustment as described in item 8 of the scope of patent application (2), wherein the voltage stabilization circuit, the trigger circuit, the comparison circuit and the logic circuit can be packaged into a control product. Body circuit (IC), the control integrated circuit (IC) includes at least the following pins: a first power pin, a ground pin, a second power pin, a charging input pin, a first Output pin. Page 20