TWI344746B - Driving circuit and power converter having the driving circuit - Google Patents

Description

1344746 IX. Description of the Invention: [Technical Field] The present invention relates to a driving circuit and a power converter including the same, and particularly to an active correction driving circuit and a power converter including the same . [Prior Art] Driving Synchronous Rectifier Thunder Referring to FIG. 1, a conventional self-driven synchronous rectification power converter includes a main transformer 71, a driving switch 72, a rectifying switch 73, a circulating current switch 74, an inductor 75 and a Capacitor 76. And the main transformer 71 includes a first coil 711 and a second coil 712. A first end of the first coil 711 receives an input power source 77. A control terminal of the driving switch 72 receives a driving signal, and an external load 78 is connected in parallel with the capacitor. When the driving switch 72 is controlled to be turned on by the driving signal, the first end of the second coil 712 can sense the input power π' through the first coil 711 to cause the rectifying switch 73 to be in an on state. At this time, the loop switch 截止 turns off the '-switching current flows from a first end of the second coil 712 toward the inductor 75 to store energy to the inductor 75, and further transmits energy to the capacitor 76. External load 78. Then, the animal drive switch (5) 72 is turned off by the drive signal control, and the rectifier switch 73 is controlled by the first end of the second coil 712 to exhibit a cutoff performance. At this time, the circulating current switch 74 is turned on, and the current direction of the switching current flows from the capacitor 76 to the inductor 75 and the circulating current switch 74, and the inductor 75 enters 5 1344746 rows to release energy. Until the driving switch 72 is again controlled by the driving signal, the rectifying switch 73 is in an on state, and when the circulating current switch 74 is kept on, the switching current still flows from the capacitor 76 to the inductor 75, and the absolute value of the switching current The value gradually decreases. At this time, a part of the switching current flows from the inductor 75 through the circulating current switch 74 and the rectifying switch 73 to the second coil 712, and the first coil 711 senses a reverse current that is sent back to the input power source 71, so-called countercurrent. phenomenon. • When the absolute value of the current flowing from the capacitor 76 to the inductor 75 drops to zero, the loop switch 74 is turned off, and the current direction is changed from the second coil 712 to the inductor 75, the energy can be transferred again to the external connection. Load 78. In the conventional self-driven synchronous rectification power converter, when the drive switch 72 is switched from the off state to the on state, the loop switch 74 cannot immediately switch to the off state synchronously, resulting in a reverse flow phenomenon, thereby causing power loss and power conversion. Reduced efficiency. • Known that the synchronous rectifier power supply controlled by current transformer is referred to Figure 2'. Refer to the Republic of China Patent No. 22〇〇84. It is known as a synchronous rectifier power converter controlled by current transformer. It is suitable for non-continuous power. The weight includes a switch crystal 82, a flyback variable pressure state 81, a current transformer 87, a control circuit 84, a switch drive unit 85, a synchronous rectification switch 83, and a capacitor 86. The flyback transformer 81 includes a first coil 811 and a second coil 812. The current transformer 87 includes a second coil 871 and a fourth coil 872. A first end of the delta first coil 811 receives an input power supply 88. The control terminal of the open crystal 82 receives a drive signal, and the capacitor 86 is connected in parallel with an external load 89. When a control terminal of the switch crystal 82 receives a drive signal, the fourth coil 872 of the current transformer 87 can sense an induced voltage corresponding to the input power source 88 through the retway voltage state 81. The control circuit 84 receives the induced voltage from both ends of the fourth coil 872 to control the switch driving unit 85' to determine the conduction state of the synchronous rectification switch 83, thereby determining whether to transfer energy to the external load 89. When the current direction sensed by the second coil 812 is reversed from the capacitor 86 to the second coil 812 and the switch crystal 82 is in an on state, it is conventional to use a current transformer to control the synchronous | current power converter to ensure the The synchronous rectification switch 83 is in an off state, which does not cause current to flow back to the input power source, causing a backflow phenomenon. The switch driving unit 85 cannot synchronously control its control terminal according to the first end of the synchronous rectifier switch 83, so the circuit synchronization situation is not good. The above problems with the power converter in terms of driving capability, switching reverse current, and circuit synchronization can be solved by a general driver chip. However, the cost of driving the Japanese film is too high, and at the same time, the overall price of the power converter is increased: Because of &, how to provide a power converter that has low driving cost while having high driving capability and avoiding road synchronization is an important goal at present. SUMMARY OF THE INVENTION In addition to increasing the cost of driving while reducing the cost of the circuit, it is an object of the present invention to provide a driving circuit for 1344746 and a power converter including the same, which provide a force to prevent backflow and improve circuit synchronism. Thus, the power converter of the present invention is adapted to receive an input power source and a driving signal having two steady-state levels and electrically connect an external load, the power converter comprising a main switch, a main transformer, and a switching circuit And a drive circuit. The main switch is controlled by the drive signal to change the conduction state. The main transformer has a first coil on the primary side and a second coil on the secondary side

a coil, the first coil being electrically connected to the main switch and receiving the input power via the main switch. The switching circuit is electrically connected between the second coil of the main transformer and the external load and includes a switch that switchably changes an on state to change a power receiving state of the external load, and the second coil and the A synchronization signal is output on the loop formed by the switching circuit. The driving circuit comprises: a dead time controller having a second switch and a fourth switch, the fourth switch being controlled by the synchronization signal to control

An on state of the second switch; and an inverting generator having a first switch and a fifth switch, the first switch being controlled by the driving signal, and the fifth switch being subjected to the first switch and the second The control of the switch controls a conduction state of the switch of the switching circuit by outputting a switching signal that is inverted with the driving signal. When the driving signal is turned from a high potential to a low potential, and the synchronization signal is stepped down to a low level that cannot turn on the second switch, the switching signal is turned to a high potential, the fifth switch is turned on and the synchronization signal is The distance between the falling edge b and the switching time 8g is maintained at a dead time 8 1344746 when the driving signal is turned from a low potential to a high potential, and the synchronization signal is raised to a high potential for turning the second switch on, The fifth switch is worn, so that the switching signal is turned to a low potential, and the rising edge of the synchronization signal can maintain a dead time interval β between the switching signals. The driving circuit of the present invention is adapted to control a switch and receive-synchronize The signal and a driving signal include: a dead-time controller having a second switch and a fourth switch, the fourth switch being controlled by the synchronization signal to control an on state of the first switch; and an inversion generation And having a first switch and a fifth switch, the first switch being controlled by the drive signal, and the fifth switch being controlled by the first switch and the second switch to output a switching signal that is inverted with the driving signal to control an on state of the switch. When the driving signal is turned from a high potential to a low power & and the synchronous signal is stepped down to a low potential that cannot be turned on by the second switch When the fifth switch is turned on, the switching signal is turned to a high potential, and the falling edge of the synchronization signal can maintain a dead time interval from the switching signal. When the driving signal is turned from a low level to a high level, and the synchronization signal is raised to a high level at which the second switch is turned on, the fifth switch is turned off, so that the switching signal is turned to a low-丄i and the path k is The rising edge of the chirp can maintain a dead time interval between the switching signals. The driving circuit of the invention and the power converter including the driving package of the driving circuit can actively correct the switching signal, so that the poles F...k and the switching signal maintain a dead time interval to ensure no The occurrence number synchronizes the circuit and uses the section "' and cooperates with the effect of the invention. (four) circuit (four) drive capability 'to achieve this 9

[Embodiment] The following referenced drawings of the present invention are clearly shown. The foregoing and other technical contents, features and effects, in the detailed description of the eight preferred embodiments, will be: before the present invention is described in detail, it is noted that in the following description, a similar element is The same number is used to indicate. The cover 2 is preferably placed on the shoulder 3'. The first preferred embodiment of the power converter of the present invention is adapted to receive an input power signal 61 having two steady-state levels of the first drive signal d^vel 'and An external load 62 is connected, and in the preferred embodiment, the signal is pulse width modulation (pulse width mQdulatiQn, referred to as the stomach number, but not the first embodiment of the power converter of the present invention) The example includes an input circuit 1, a main transformer 21, a driving circuit 3, a first switching circuit 41, and a first output circuit 51. The driving circuit 3 receives the first driving signal ddvel and the - synchronization signal, and Sending-switching signal. In the present embodiment, the switching signal is a third driving signal (5), the input circuit 1 receives and outputs the input power source 61, and outputs a main control voltage according to the first driving signal drivel. The main switch u includes a first end, a second end and a control end. The second end of the main switch n is grounded, and the main switch 11 is The control terminal can receive the first driving signal drivei, Determining the voltage of the first end of the main switch 11, that is, the main control voltage. When the first driving signal drivel is in a low potential state, the main control voltage exhibits a high potential state. The first driving signal of the Hetian is driven to a high potential state, and the main control The voltage assumes a low potential of 10 1344746. The magnetic reset unit 12 is electrically coupled between the input power source 61 and the first end of the main switch 11.

The main transformer 21 determines an operating state based on the main control voltage. The main transformer 21 is a forward transformer including a first coil 211 on the primary side and a second coil 212 on the secondary side. The first end of the first coil 211 receives the input power source 61, and the second end of the first coil 211 receives the main control voltage. When the main control voltage is in a low potential state, the first end of the second coil 212 can sense a pair of coupling signals that should be input to the power source 61. § If the main control voltage is in the potential state, it cannot be sensed.

The first switching circuit 41 determines whether to transfer energy to the external load 62, including a detector 411 and an inverting switch 412. The detector 411 has an anode and a cathode. The inverter switch 412 has a first end, a second end and a control end. The anode of the detector 411 is electrically coupled to the first end of the second coil 212, the cathode of the detector 411 is electrically coupled to the first end of the inverting switch 412, and thereby the synchronization signal sync is output at the electrical connection. And the second end of the inverting switch 412 is grounded. That is to say, the synchronization signal is called to correspond to the cross voltage between the first end and the second end of the inverting switch 4U @. The control terminal of the inverting switch 412 receives the third driving signal from the driving circuit 3. In the preferred embodiment, the detector 411 is a diode and is not limited thereto. The first output circuit 51 includes an output inductor 511, an output resistor 5Π, and an output capacitor 512. The output inductor 511 and the output resistor 513 are connected in series between the first end and the second end of the inverting switch 412, and the output resistor 513 and the external load 62 are mutually connected/output 11 , see FIG. 4 , The driving circuit 3 receives the first driving signal drive1, and accordingly sends a first driving number drive3 (such as ®1 5) that maintains a dead time (dead) with the synchronization signal sync. The driving circuit 3 includes an isolator 31, a one-bit regulator 32, an inversion generating n 33, a dead-time controller 34, and an accelerating unit 35. The isolator 3 1 causes the first drive signal drive 1 to isolate the noise and output the γ first drive signal drive2. The level adjuster ^ can perform DC bias isolation and voltage level control processing on the third (four) signal dnve2 to output a level after signal adj_ve, the inverting generator 33 receives the level after signal adj_v To output an inverted signal irw that is inverted from the level-after signal. The acceleration unit 35 outputs the third drive signal drive3' according to the inverted signal inv and speeds up the discharge speed of the first switching circuit 41. The dead time controller 34 can ensure that there is a dead time between the synchronization signal _ and the third drive nickname drive3, reaching zero voltage switching. Voltage Switch ‘ZVS for short and zero current switching (Zer〇 Cu

Switch, referred to as ZCS). The isolator 31 is used to avoid noise and has a first isolation coil 311 and a first isolation coil 312. The first end of the first isolation coil 311 receives the first drive h drive 1, and the first end of the second isolation coil 312 outputs the second drive signal drive2. And the second ends of the first and second isolation coils 311, 312 are respectively grounded. In the preferred embodiment, the isolator 31 is a transformer, but may be an optical coupler, and is not limited thereto. The level adjuster 32 can perform DC bias isolation and voltage level control processing on the second drive signal drive2. The level adjuster 32 has a first capacitor ci, a first valley C2, a first resistor R1, a second resistor R2, and a first -b*-pole D1. The first capacitor C1 receives the second driving signal drive2, and the first resistor valley C1, the first resistor Ri and the second resistor R2 are sequentially connected in series to the first isolation coil 312. Between one end and the second end. The second capacitor C2 蛊哕Μ ～ the first resistor R2 is connected in parallel and the first diode D1

The anode is grounded, and the cathode of the first __is: a*... L body D1 is electrically connected to the first resistor R Ά the first resistor R2 Μ ' and thereby outputs the level post signal adj_v. 〆Inverting generator 33 receives - DC power supply DC and the post-level signal

Query -V to output an inverted signal inv which is inverted from the level signal adj-v. The inverting generator 33 and the right_eight have a first switch Q1, a fifth switch Q5, a third resistor R3, a fourth resistor R4, a second diode D2, and a first pole D3H. The control terminal of the switch Q1 receives the level signal j- and the second terminal of the switch Q1 is grounded. The first end of the first switch Q1 is electrically connected to the cathode of the third diode D3 and the control of the fifth switch Q5

System end. The third resistor R3 and the fourth resistor R4 are sequentially connected in series between the control end of the fifth switch Q5 and the first end. The cathode of the second diode d2 is electrically connected between the second resistor R3 and the fourth resistor R4. The anode of the second diode receives the DC power source DC and is connected to the anode of the third diode. In the preferred embodiment, the DC power source DC is the voltage transmitted to the external load 62, but may also be an external power source. The dead-end time controller 34 can maintain the rising edge and the falling edge (faUing edge) of the third driving signal ddVe3 with the synchronization signal Syne according to the synchronization signal sync, and the dead-time is not allowed to be simultaneously 13 two potential state and ♦ secret 4 Λ second switch Q2, - second:. The dead time controller 34 has - (four) - seventh electric = 7 Γ: fifth electric " 5, a sixth electric eighth resistor R8, a fourth diode D4 and a fifth diode D5. The fifth resistor R5, the third resistor, the seventh resistor, and the first terminal of the switch Q2 are electrically connected to the first switch Q1. The fifth resistor (four) The control terminal of the Dijon Thunder switch is electrically connected to the two ends. And the second terminal of the second switch Q2 is electrically connected to the fourth diode D4: the first end of the fourth switch Q4 is electrically connected to the fourth diode 4 The second end of the fourth switch Q4 is electrically connected between the fifth power 5 and the seventh resistor R7 and grounded. The eighth resistor is electrically connected between the control terminal of the =four switch Q4 and the cathode of the fifth diode D5. And the synchronization signal sync from the first switching circuit 41 is received by the anode of the fifth diode D5. The temperature acceleration of the first switching circuit 41 can be accelerated by the acceleration of the temperature. Having a third switch Q3, a ninth resistor R9, and a sixth diode (10), the ninth resistor R9 is electrically connected to a control terminal of the third switch Q3, and the second terminal body The cathode of D6 is electrically connected to the first end of the third switch Q3. Receiving the inverted signal from an electrical connection between the sixth diode D6 (four) pole and the control terminal of the third switch Q3, and the first terminal of the third switch Q3 outputs the third driving signal drive3, the third switch The second end of Q3 is grounded. When the second driving signal drive3 is cut to a low potential, the third switch Q3 leads 14 1344746 =, at which time the parasitic capacitance of the inverting switch 412 can be turned on via the third open power to speed up the inverting switch 412 into the cut-off bear. The operation of the drive circuit 3 will be described below with respect to the four potential conversion patterns of the first drive signal drive1. That is, the high potential is changed from: the potential to the low potential, the low potential, and the low potential to the high potential. ask

=4 and FIG. 5 'When the first driving signal _ is at a high potential', the high potential of the synchronization signal s can turn on the second switch Q2, and the high potential of the signal adj_v after the level makes the _th switch When the qi is turned on, at this time, the fourth switch Q4 is turned on and the third diode 〇3 and the third switch Q3 are turned on, and the fifth switch Q5 is turned off, so that the third driving signal (4) is low.

Drive (four) drivel from high potential to low potential 'and the synchronous signal is stepped down to the (ie, falling edge) can not make the second open _ such as the low level of conduction, and the level signal adj_v also drops to the first switch qi When the low level is turned on, the fourth switch Q4 is turned on, and the fifth switch Q5 and the sixth diode D6 are turned on, and the third switch Q3 is turned off, so that the third driving signal d-3 is turned to a high potential. Therefore, the falling edge of the sync money_ can be held at a distance from the second drive letter E dHve3 m for a dead time, that is, zero voltage switching can be achieved. When the first driving signal drive1 is at a low potential, the low potential of the synchronization signal sync cannot turn on the second switch q2, and the low potential of the signal adj_v after the level cannot make the first _ φ turn on, at this time, the fourth On: Q4 is turned on, the fifth switch Q5 and the sixth diode 〇6 are turned on, and the third switch Q3 is turned off, so that the third driving signal 丨3 is at a high potential. 15 1344746 When the first-drive signal drivel is turned from a low potential to a high potential, and the synchronization signal sync is boosted to (ie, the rising edge) is sufficient to make the second open_none turn on the two potentials' and the level is after the signal 坤_¥ When the high potential of the first turn-on is turned on, the 'fourth switch q4 is turned off' and the third diode and the third switch Q3 are turned on, and the fifth switch Q5 is stopped, so that the third drive is dHVe3 transitions to a low potential. Therefore, the first driving signal and (10) start the transition state (rising edge) - after a short period of time, the synchronization signal _ is in a state (rising edge), so the rising edge of the synchronization signal sync and the third driving signal ddve3 Keep - the distance between dead time, that is, the flow switching can be achieved. From the analysis of the above four potential conversion states, it can be known that the third drive signal drive3 is at a high potential only when the synchronization signal SynC is at a low potential. That is, the two signals are not in a high potential state at the same time, and it is possible to achieve zero voltage switching and zero current switching. Referring to Figures 3 and 5, the operation of the preferred embodiment will now be described in the following four time intervals. In the time t 〇 to the time u, the first drive signal drive1 is in the high potential state 'the main switch U is turned on, and the drive circuit 3 generates the second drive signal drive3 which is low. The inverting switch 412 is turned off by the third driving signal dnve3. At this time, the switching current flows from the first end of the second coil sc to the output inductor 511, and the output inductor 511 is stored to transfer energy to the external load 62. In time t1 to time q, the first drive signal drivei is switched from the high potential L to the low state, the synchronization signal is also turned to the low level, and 16 1344746 is kept dead with the third drive signal drive3 which will turn to the high potential. Extreme time (zero voltage switching). At this time, the main switch 11 is turned off, and the first coil 211 starts to release energy to the magnetic reset unit 12. The inverting switch 412 is turned off, and the switching current continues to store energy to the output inductor 511 to transfer energy to the external load 62.

In the time t2 to the time t3, the first driving signal is "lower potential H, the main switch 11 is turned off", the driving circuit 3 generates a high potential first drive H drive 3. The reverse driving switch 412 is subjected to the third driving signal The -3 control is turned on. At this time, the first coil 211 releases energy to the magnetic reset unit 12, and the output inductor 511 releases energy to the inverter switch 412.

At the time. After the first driving signal_starts the transition state (rising edge) for a short period of time, the synchronization signal sync also undergoes a transition state (rising edge) and remains with the third driving money ddVe3 that will turn to a low potential. - Dead time (zero current switching). At this time, the main switch U enters a conducting state, and the second driving signal drive3 (4) is switched to a low potential, and the inverting switch = thus rapidly cuts off, so that the switching current again stores the monthly b for the output inductor and transmits energy. To the external load 62. Second Preferred Embodiment Referring to FIG. 6, a first preferred embodiment of the power conversion + state of the present invention comprises an input circuit 1 a main transformer 22 - a driving circuit 3, a path 41 and a first output circuit 5 ,,. The drive circuit 3 receives the first drive 仏唬dnvel and a synchronization signal. For example, in the embodiment, the switching signal is a first-out-switching signal. The driving circuit 17 is similar to the first preferred embodiment, and will not be described herein. . The black input circuit 1 omits the magnetic reset switch 12 from the first preferred embodiment, and the remaining components and actuation conditions are similar, and thus will not be described again. The Lord is willing to cry Ο amp & thieves 22 according to the main control voltage to determine the operating state. The main transformer state 22 is returned to the transformer, and includes a first coil 221 and a second line n. The first end of the first line _221 receives the input power source 61, and the second of the 'good circle 221 The terminal receives the main control voltage. When the main control voltage is low

The second end of the potential & xiao-coil 222 can sense - the corresponding combination ##, σ彳5 of the input power source 61. When the main control voltage is high, it cannot be sensed. The ## change circuit 41 determines whether or not to transfer energy to the external load 62. The first-:-switch circuit 41 includes an in-phase switch 413, and the in-phase switch has a first end, a second end, and a control end. The second end of the non-inverting switch 413 is grounded to the same phase 413 (four) - the end is electrically connected to the second line

The first end of circle 2 is 'and a sync signal equal to the coupled signal is sent therefrom. That is to say, the sync signal & coffee corresponds to the crossover between the first end and the second end of the in-phase switch 413. The non-inverting switching control terminal receives the second driving signal ddve3 from the first circuit of the driving circuit 3. The first output circuit 51 includes an output resistor 513 and an output capacitor 512. The output resistor 513 is electrically connected between the first end of the second coil 222 and the second end of the in-phase switch 413, and the output capacitor, the output resistor 513 and an external load 62 are connected in parallel with each other. Referring to Figures 5 and 6, here, the following four time intervals are used to illustrate the operation of the preferred embodiment. 18 1344746 The drive circuit 3 generates a low potential third drive signal ddVe3 when the time gate t 〇 to the time U 'the first drive signal drivel is in a high potential state'. The main switch 11 is turned on, and the in-phase switch 413 is turned off by the third drive signal dnve3. At this time, the second coil melon is stored. In time t2, the first drive signal 妃~ is switched from the high potential state 4 to the low potential state, and the synchronization signal s is also turned to the low potential, and the third drive signal core 3 that will be converted to the metapotential Keep a dead time (zero

Voltage switching) ° At this time, the main switch u is turned off, the in-phase switching is turned off, and the second coil 222 continues to store energy. At time t2 to time t3, the first drive signal drive1 is in a low potential state _ 'the main switch U is turned off'. The drive circuit 3 generates a third drive signal 35driVe3 of a high potential. The in-phase opening 413 is turned on by the third driving signal. At this time, the energy of the second coil 222 is transferred to the external load 62.

In time t3 to time t4, after the first driving signal drivel starts to transition (rising edge) for a short period of time, the synchronization signal sync undergoes a transition state (rising edge) and is affected by the conduction of the first switch Q1. The third drive signal drive3, which is turned to a low level, maintains a dead time (zero current switching). At this time, the main switch U enters an on state. The third drive signal _ is quickly switched to a low potential, the in-phase switch 413 is thus quickly turned off, and the second coil 222 performs energy storage again. Referring to FIG. 7, a third preferred embodiment of the power converter of the present invention comprises an input circuit i, a main transformer 21, a driving circuit 3, a first switching power 19 1344746, a 41 and a first An output circuit 51. And the driving circuit 3 receives the first driving signal drivel and a synchronization signal sync, and sends a switching signal. In the embodiment, the switching symbol has a second driving signal drive2 and a third driving signal drive3. Except for the first switching circuit 41, the remaining components are similar to the first preferred embodiment, and are not described herein. The first switching circuit 41 determines whether or not to transfer energy to the external load 62. The first switching circuit 41 includes an in-phase switch 413 and an inverting switch 412', and the in-phase switch 413 and the inverting switch 412 respectively have a first end, a second end and a control end. The first end of the in-phase switch 413 is electrically connected to the second end of the second coil 212, and the second end of the in-phase switch 413 and the second end of the inverting switch 412 are respectively grounded, and the One end electrically connects the first end of the second coil 212, and thereby outputs a synchronization signal sync equal to the coupling signal at the electrical connection. That is, the sync signal sync corresponds to the voltage across the first end and the second end of the inverting switch 412. The control terminal of the in-phase switch 413 receives the second driving signal drive2'. The control terminal of the inverting switch 412 receives the third driving signal drive3. The operation of the preferred embodiment will be described with reference to Figures 5 and 7 'herein' in the following four time intervals. The main switch 11 is turned on during the period t0 to t1, and the first drive signal drive1 is in the high-level state. The drive circuit 3 generates the second drive signal drive2 of the high potential and the third drive signal drive3 of the low potential. At this time, the in-phase switch 413 is turned on and the inverting switch 412 is turned on. The switching current flows from the first end of the second coil 212 to the output inductor 511, and the 20 1344746 output inductor 511 is stored to transfer energy. The output capacitor 512 is connected to the external load 62. During the time ti to the time t2, the first driving signal dHvel is switched from the high potential state to the low potential state, the synchronization signal sync and the second driving signal drive2 are also turned to the low potential, and the third driving will be turned to the high potential. The signal drive3 maintains a dead time (zero voltage switching at this time, the main switch is "off", the first coil 211 starts to release energy to the magnetic reset unit 12, and the in-phase switch 413 and the inverting switch 412 are turned off by the output. The capacitor 512 supplies energy to the external load 62. During the time t2 to the time t3, the first driving signal is in a low potential state, the main transformer 21 cannot sense, and the driving circuit 3 generates a low potential second driving signal drive2 and high. a third driving signal ddve3 of the potential. The in-phase switch 413 is turned off by the second driving signal drive2, and the inverting switch 412 is turned on by the third driving signal drive3. At this time, the main switch 11 is turned off, the first A coil 211 releases energy to the magnetic reset unit 12, and the output inductor 511 releases energy to the inverting switch 412. In time t3 to time η, the first drive signal ddvel opens After a short period of time (rising edge), the synchronization signal sync also undergoes a transition state (rising edge) and maintains a dead time (zero current switching) with the third driving signal drive3 that will be turned to a low potential. The main switch u and the non-inverting switch 413 enter an on state, the inverting switch 412 is quickly turned off, and the switching current again stores energy to the output inductor 51, and transfers energy to the output capacitor 512 and the external load 62°. Blanket embodiment 21 Referring to FIG. 8, the input circuit i of the power converter of the present invention, a main transformer, (4) A example includes a path 41 - a variable voltage 21' - a driving circuit 3, a first switching power - a second switching The circuit 42 and a first round-out circuit 52. The first switch circuit i, the drive circuit 3, the first switch circuit 41 and the circuit 51 are similar to the first preferred embodiment, and the second switch

The first output circuit 52 is similar to the first switch circuit 41, and is not described herein. The main transformer 21 is a forward transformer including a first coil 211 a second coil 212 and a third coil 213. The two =## change circuits 41 of the second coil M2 are electrically connected, and both ends of the third coil (1) are connected. The second switching circuit 42 is electrically connected. The operation of the preferred embodiment is similar to that of the first preferred embodiment, and those of ordinary skill in the art can delineate it, and thus will not be described herein.隹 implementation

Referring to FIG. 9, a fifth preferred embodiment of the power converter of the present invention includes a turn-in circuit 1', a main transformer 21, a driving circuit 3, a first switching circuit 4, a wall, a brother-switching circuit 42, A first output circuit 51 and a second output circuit 52. The main voltage regulator 21, the second switching circuit 42 and the second output circuit are shown

52 K K, the remaining components are similar to the previous embodiment, and will not be described here. In the main transformer 21, both ends of the second coil 212 are electrically connected to the first switching circuit 41, and the first end of the second coil 212 is electrically connected to the second end of the 22nd coil 213. The third coil 213 is the anode of the detector 421 of the second switching circuit 42. Referring to FIG. 10, a sixth preferred embodiment of the power converter of the present invention includes an input circuit i, a main transformer 21, a driving circuit 3, a first switching circuit 41, and a second switching. The circuit 42, a first output circuit η and a second output circuit 52.

Except for the connection mode of the main transformer 21, the remaining components are similar to the fourth preferred embodiment and will not be described herein. In the main transformer (four) 21, both ends of the second coil 212 are electrically connected to the first switching circuit. The first end of the third coil 213 is electrically connected to the anode of the detector 421 of the second switching circuit 42, and the second end of the third coil 213 is electrically connected to the cathode of the detector 411 of the first switching circuit 41. The operation of the preferred embodiment is similar to that of the fifth preferred embodiment except

The first end electrically connected to the third coil 213 is stacked through the detector 4 of the first switching circuit 41 and the second coil 212. Preferably, the seventh preferred embodiment of the power converter of the present invention comprises an input circuit, a main transformer 22, a drive circuit 3, a first switching circuit 41, and a second switching circuit. 42. A first output circuit 51 and a second output circuit 52. The input circuit 1, the driving circuit 3, the first switching circuit 41, and the first output terminal 51 are similar to the second preferred embodiment, and the second finger circuit 42 is similar to the first switching circuit 41. The second output circuit ^ 23 1344746 is similar to the first output circuit 51 and will not be described herein. The main transformer 11 22 is a reciprocating device comprising a first coil 222 and a third coil 223. The two ends of the second coil are electrically connected to each other. The two ends of the third coil 223 are electrically connected to the switching circuit 42. The second end of the second coil (2) is opposite to the second phase. The second-coil 223 of the second coil 223 is detected by the 61-knife-corresponding to the input power source. The operation of the preferred embodiment is similar to that of the second preferred embodiment, and the technical field of the invention Those who have ordinary knowledge can infer this and do not repeat them. Implementations - Referring to Figure 12, an eighth preferred embodiment of the power converter of the present invention comprises - an input circuit - a main transformer 21, a drive circuit 3, a first a switching circuit 41, a second switching circuit 42, a _output circuit ^ and a first output circuit 52. The wheel circuit!, the driving circuit 3, the (4)th circuit Μ and the wheel circuit 51 and The second preferred embodiment is similar, and the second switch 2 42 is similar to the first switching circuit 41. The second output circuit is similar to the "-output circuit 51" and will not be described herein. - The main transformer 21 is a forward transformer 'including a first coil 211 end 212 and a third coil 213. The second coil 2 is electrically connected to the first switching circuit 41. The two ends of the third coil 213 are electrically connected to the switching circuit 42. The first end of the second coil 212 is the third end of the third coil. One end can sense a pair of coupled signals that should be input to the power source 24 61, respectively. The operation of the preferred embodiment is similar to that of the third preferred embodiment, and those of ordinary skill in the art to which the present invention pertains can be inferred, and thus will not be described herein. It should be noted that, in the above preferred embodiment, the ratio of the turns of the first coil 21 i , 221 and the second coil 212 , 222 is 1: i, the first coil 211, 221 and the third The coil gate ratio of the coils 213 and 223 is i.1, and the ratio of the turns of the first isolation coil 311 and the second isolation coil 312 is 1:1, and is not limited thereto. It should be noted that, in the above preferred embodiment, the main switch u, the inverting switches 412 and 422, and the in-phase switches 413 and 423 are N-type transistors, and are not limited thereto. The first switch Q1 and the second switch Q2 of the driving circuit 3 are N-type transistors, and the third switch Q3 and the fourth switch Q4 are PNP dual-carrier junction transistors (bip〇lar juncU〇n) -_, abbreviated as BJT), the fifth switch q5 is NpN B JT, and is not limited thereto. It is also worth noting that the drive circuit 3 in the above embodiment can be independent of the power converter of the present invention. In summary, the driving circuit 3 can actively correct the relative relationship between the synchronization signal and the third driving signal drive3 to ensure that no backflow phenomenon occurs, and synchronize the circuit with the synchronization signal sync. The accelerating unit 35 of the driving circuit 3 contributes to the discharge speed of the switch driven by the third driving signal, and the driving capability can be effectively improved. Further, + needs to use a driving chip as in the prior art. The present invention can achieve the above requirements and greatly reduce the cost of the circuit, so that the object of the present invention can be achieved. 25 1344746 The above is only the preferred embodiment of the private/i-^ private month of the present invention, and is not limited to the embodiment of the present invention. The patents and the content of the invention are intimidating and the equivalent changes and modifications are still within the scope of the invention. [Simple diagram of the diagram] Figure 1 is a conventional self-driving between the cattle map; the circuit with the V whole bIL power converter Figure 2 is a conventional synchronous rectification power conversion thief with current change 懕 妖 w 3 is a circuit diagram of a driving circuit of a first preferred embodiment; FIG. 3 is a circuit diagram of a driving circuit of a first preferred embodiment; 5 is a timing diagram illustrating a first comparative relationship; (4) FIG. 6 is a circuit diagram of a second preferred embodiment of the power converter of the present invention; FIG. 7 is a third comparison of the power converter of the present invention. Figure 8 is a circuit diagram of a fourth preferred embodiment of the power converter of the present invention; Figure 9 is a circuit diagram of a fifth preferred embodiment of the power converter of the present invention; Circuit 26 of the sixth preferred embodiment of the converter 1344746

Figure 11 is a circuit diagram of a seventh preferred embodiment of a power converter of the present invention; and Figure 12 is a circuit diagram of an eighth preferred embodiment of a power converter of the present invention. 27 1344746

[Main component symbol description] 1 Input circuit 422 Inverting switch 11 Main switch 423 Non-inverting switch 12 Magnetic reset unit 51 First output circuit 21 Main transformer 511 Output inductance 211 First coil 512 Output capacitor 212 Second coil 513 Output resistance 22 Main transformer 52 second output circuit 221 first coil 521 output inductor 222 second coil 522 output capacitor 3 drive circuit 523 output resistor 31 isolator 61 input power supply 311 first isolation coil 62 external load 312 苐 - an isolation coil 63 external load 32-bit quasi-adjuster adj_v post-level signal 33 inverting generator inv inverting signal 34 dead-time controller drel first drive signal 35 acceleration unit drive2 second drive signal 41 first switching circuit drive3 third drive signal 411 detection Sync sync signal 412 inverting switch Cl first capacitor 413 non-inverting switch C2 second capacitor 42 second switching circuit D1 first diode 421 detector D2 second diode 28 1344746

D3 third diode D4 fourth diode D5 fifth diode D6 sixth diode DC power supply Q1 first switch Q2 second switch Q3 third switch Q4 fourth switch Q5 fifth switch R1 first Resistor R2 second resistor R3 third resistor R4 fourth resistor R5 fifth resistor R6 sixth resistor R7 seventh resistor R8 eighth resistor R9 ninth resistor

29

Claims (1)

Patent application scope: Power converter, suitable for receiving-input power supply and driving signal with two German status bits into M Br_ 1 and electrically connecting an external load, which includes: - main switch, subject to The driving signal is controlled to change the conduction state; a main transformer has a first coil on the primary side and a second coil on the human side, the first coil is electrically connected to the main switch and is switched through the main switch Receiving the wheeled power supply; a switching circuit electrically connected between the second coil of the main transformer and the connected load, and including a switch switchably changing an on state to change a power receiving state of the external load And a synchronization signal is outputted on the loop formed by the second coil and the S-switching circuit; and a driving circuit includes: a dead-time controller having a second switch and a fourth switch, the fourth switch being Synchronizing signal control to control an on state of the first switch; and - an inverting generator having a first switch and a fifth switch, the first switch being driven by the drive The driving signal is controlled, and the fifth switch is controlled by the first switch and the first switch to control the conduction state of the switch of the switching circuit by the output switching signal of the current driving signal; when the driving signal is When the high potential is turned to the low potential, and the synchronous signal is stepped down to a low potential that cannot be turned on by the second switch, the fifth switch is turned on 'to make the switching signal transition to a high potential, and 30 1344746 the falling of the synchronous signal Maintaining a dead time interval between the edge and the switching signal; when the driving signal is turned from a low level to a high level, and the synchronization signal is raised to a high level that turns the second switch on, the fifth switch is turned off, so that the fifth switch is turned off, The switching signal transitions to a low potential, and a rising edge of the synchronization signal can maintain a dead time interval from the switching signal. 2. The power converter according to claim 1, wherein the driving circuit further comprises an accelerating unit having a third switch, wherein when the switching signal is switched to a low potential, the third switch is turned on, Speed up the switching off of the switching circuit. / 3. According to the shot, please patent the scope! The power converter of the present invention, wherein the driving circuit further comprises an isolator for isolating the driving signal. / 4. The power supply (four) device according to the first item of the patent scope, wherein the driving circuit further comprises a level regulator, which can perform DC bias isolation and voltage level control processing on the driving signal, and has a a first capacitor, a second capacitor, a first resistor, a second resistor, and a first diode, and the second valley, the first resistor and the second resistor are sequentially connected in series, and the second capacitor, The first diode is connected in parallel with the second resistor, and the cathode of the second diode is electrically connected between the first resistor and the second resistor: the power converter according to claim 1 Further comprising an output circuit connected between the switching circuit and the external load, the 4 circuit capable of storing energy transferred from the switching circuit or releasing energy to the external load of 31 1344746. 6. A driving circuit, suitable for controlling a switch and receiving a synchronization signal and a driving signal, comprising: a dead time controller having a first switch and a fourth switch, the fourth switch being subjected to the synchronization signal J7 loosely controls to control the conduction state of the second switch; and - the inverter manufacturer ' has a first switch and a fifth switch, the first switch is controlled by the driving signal, and the fifth switch is controlled The control of the first switch and the second switch controls a conduction state of the switch by outputting a switching signal that is inverted with the driving signal; when the arduous signal changes from a high potential to a low potential, and the synchronization signal When the dust is low to a low level at which the second switch cannot be turned on, the fifth switch is turned on to cause the switching signal to transition to a high potential, and the falling edge of the synchronization signal can maintain a dead time interval between the switching signals; When the driving signal is turned from a low potential to a high potential, and the synchronization signal is raised to a high potential that turns on the second switch, the fifth switch is turned off, so that the switching signal is in a state of transition. A low potential, and (iv) rising edge of the sync signal to maintain a distance with dead time between the poles of the switching signal. 7. The driving circuit according to claim 6, further comprising an accelerating unit having a third switch, wherein when the switching signal is switched to a low potential, the third switch is turned on, which can speed up the switching off of the switch. speed. 8. The drive circuit according to claim 6 of the patent pending circumference includes an isolator for isolating the drive signal from noise. 9. The driving circuit according to claim 6 of the patent application scope further comprises a 32 1344746 quasi-regulator capable of performing DC bias isolation and voltage level control on the driving signal, and has a first capacitor and a first capacitor. a second capacitor, a first resistor, a second resistor, and a first diode, and the first capacitor, the first resistor and the second resistor are sequentially connected in series, and the second capacitor, the first capacitor The pole body is connected in parallel with the second resistor, and a cathode of the first diode is electrically connected between the first resistor and the second resistor. 33