TWI332608B - Switching power converter with transformer arrangement - Google Patents

Description

1332608 IX. Description of the invention [Technical field of inventions]

The correction of the invention is related to the kind of work, especially the switching power conversion [previous selection] According to the 'current power converter has been widely used to provide the adjustment voltage and current power converter research The focus is on how to make the power converter more = power. The switching power converter usually includes a control unit, a switch and a switch, wherein the control unit is used to sense the output power of the switched power converter and to control the switching of the switch and adjust the output voltage of the switched power converter. And / or output current. Referring to Figure-FIG., it is a circuit diagram of the switching type identification converter. As shown in the figure, the conventional switching power converter includes a transformer 1G including - winding NP, - secondary winding Ns and an auxiliary winding Na, one end of the primary winding group is coupled - positive power supply ViN; - off u, connected - the other side of the secondary winding (four), and connected to - via the - resistor 12, the negative power supply is the switch 11, for controlling the switch 11 to cut the device 10, the type power converter The output depends on and/or the output current; the secondary winding H 2 tf Γ13; the first wave capacitor 14' has its two ends _ at the rectifier 13 /, the other end of one person m. When the switch u is turned on, the energy will be stored to the transformer. The release of the energy will be passed through the secondary winding 敝_,_axis_helper.

C

Vo + VF = Nnsx όΦ dt

Vaux = Ννα χ

dOIT According to equations (1) and (2), the reflected voltage V ship can be expressed as Ννα ... ' Vaux =-x (Vo + VF) Nns (1)(2) (3) 6 where, the money is replaced by the subgroup Na And the voltage drop of the two-pronged converter (four) flow (four), φ is the magnetic flux Dong ' φ = 3⁄4 ^ π is 曰 + the core cross-sectional area is the magnetic flux (four) degrees, Ae is the axis of the H 10 control early element 25, its setting has _ supply terminal — and - ground terminal., power supply '·-f ' is lost in the "New Circuit", = I, money is connected in the marrow (four) read Lai Mi and = side end vs generation - detection „ Vdet" can be expressed as follows:

Rl5 + Rl6 (4)

Vdeti = ^-5^—xVaux whose ρ and heart are respectively the resistor 15 and the electric _<_ via: two-pole (four) pair-supply capacitor 17 to supply power to the control unit ^ resistor 12 ' is used as a current The sensing device, the resistor 12 is connected between the open I and the negative power supply to switch the transformer 1. The switching current L is a current. One of the current sensing terminals yi of the control unit 25 is connected to the resistor Μ for detecting the output of one of the control units 25 to generate a switching signal, although the conventional switching power converter can be adjusted. The output voltage and the two ", 疋, it has several shortcomings. The first disadvantage is that the leakage inductance of the transformer 导致 leads to the power of the wire. In addition, due to the leakage inductance, the energy is stored to form a high-voltage spur, such as = easy to damage the switch U ', so the switching mode of the dragon is difficult to protect the switch n There is - Juf road, which contains - buffer two poles (four), - snubber capacitors 2 〇 and one, the rush resistor 21 ' is used for the energy of the n 1G _ _ stored energy, to avoid the formation of voltage surges to protect the switch 11. The second drawback is that the switched power converter lacks = integrity under light load and no load conditions. The conventional switching power converter is powered by the auxiliary winding NA of the transformer 1G to the control unit 25, so the control element 25 U is used as the electric riding table _ assist winding = the negative t diligent priest red touch her _ For the load of the remaining NA, the energy stored in the transformer 10 will only be released to the supply capacitor π via the diode 18 and the auxiliary winding team, so that when the off n is turned off, the rectifier 13 will remain closed at the closed state of 1332608, so switching The output voltage Vq of the power converter cannot be widely distributed to the control unit 25 from the auxiliary correction material, so in the state of light load and no load, the detection voltage v^m generated by the electric ~k is only connected to the supply end. The voltage of VDD is related, so the conventional switching power converter lacks adjustability. Another conventional technique is the "primary-side (7) flyback power converter) of the U.S. Patent No. 6,853, 5, which is proposed by Mr. Yang et al. One of the main disadvantages of the prior art is Electro and Magnetic Interference (EMI), which is caused by the fact that the drain of the switch is directly connected to the positive power supply, so one of the parasitic capacitances of the switch is connected to a parasitic inductance' (4) Forming a high frequency resonant tank' will result in higher electromagnetic interference. Accordingly, the present invention proposes a switching power converter having high efficiency and low power pin. Tillage, the hair cut and the age of the hair can be adjusted in a light state. The output is accurately adjusted under the condition of no load and no load. [Inventive Internal Respect] The main purpose of the present invention is to provide a damper trousers that includes a variator "variation" (four) is provided with a first-second weave group and a second-second weave group, the first primary side winding Between the second and the second touch, the efficiency of the power exchange device can be improved and the electromagnetic interference can be reduced. Another object of the present invention is to provide a switching power converter, the leakage inductance of the transformer can be secreted by the electric capacitor of the capacitor, and the switching power converter is The output voltage can be fed back to the control circuit via the second primary winding of the repeater, which improves the load regulation of the switched power converter under light load and no load conditions. A further object of the present invention is to provide a switched power converter in which a transformer is provided with an auxiliary 敝 丝 进行 进行 进行 进行 进行 , , , , , 域 域 域 域 域 域 域 域 域 域 域 域 域 域 域 域 域 域 域 域 域 域 域Operation. The switching power converter of the present invention comprises a class, the transformer is provided with an 8th primary-side winding and a second primary winding and a negative supply rail, and a switch is connected in series to the first-side winding And switching current between one of the first primary winding and the second primary winding flowing through the transformer, and a current sensing device, which engages the switch and the second primary winding , for converting a current according to one of the transformers to generate a current signal; the control circuit is coupled to the switch and the second primary winding of the transformer to generate a switching signal according to the current signal, and the switching signal is used for switching and adjusting switching The output of the power converter; a supply capacitor connected between the second primary winding control circuit to supply power to the control circuit; a diode coupled to the negative supply rail and the supply capacitor to charge the supply capacitor . Wherein, the second primary winding has a leakage inductance, which stores a stored energy when the switch is turned on, and releases stored energy to the supply capacitor via the diode when the switch is turned off. Thus, by the above-described arrangement of the transformer and the switch, the performance of the switching power converter can be improved and the electromagnetic interference can be reduced, and the load regulation of the switching power converter under the condition of light load and no load can be improved. For a better understanding and understanding of the structural features and the achievable effects of the present invention, please refer to the preferred embodiment and the detailed description, as follows: [Embodiment] Please refer to A circuit diagram of a switching power converter of the present invention. As shown in the ride, the Na-type power converter of the present invention includes a transformer 30' for storing energy and storing energy from Wei (10) to the secondary side of the transformer 30. Wherein, the primary side winding NP1 and the second primary side winding Νκ are disposed on the primary side of the medullary jaw 3, and the secondary side winding NS is disposed on the secondary side of the transformer 3 。. The power supply of the first-second winding core and the second-second winding Np2 switching power converter, that is, the first-second winding NP1-the first-end transformer 30 is powered by vIN, and the second- It is known that the first-end service transformer 30 is powered by a negative power supply, that is, it is transferred to the ground. Off 35 Inverted winding... One of the two ends and the second one side of the second: =, two months, the correction machine page gold or ·. Work 0 M"' - ....... Switch through the transformer 30 The first primary side winding Nn and the second primary side group Npz one-switching current Ip, wherein the switch 35 can be a power transistor or a power metal oxide semiconductor field effect transistor (Metal Oxide Semiconductor Field Effect)

Transistor, MOSFET). Since the switch 35 is connected between the first-stage winding core and the second primary winding Nre, the high-frequency resonance groove caused by the parasitic device can be eliminated, thereby reducing electromagnetic interference. A current sensing device, such as one of the current sensing resistors 37, is connected to the switch 35 and the second primary winding Npa at both ends to generate a current signal Vcs according to the switching current Ip of the transformer 3. In order to adjust the output voltage v〇 of one of the switching power converters, a control circuit 100 is coupled to the switch 35 and the second primary winding Np2 of the transformer 30 to generate a switching signal Vpw 'for switching the switch 35 and adjusting the switching The output voltage V of the power converter. . A supply valley 70 is connected to the second primary winding Nre and the control circuit 100 to supply a power supply to the control circuit 100. The supply capacitor 7 is provided with a first diode 60 between the negative supply rail of the transformer 3. . A buffer circuit 45' is coupled between the first side winding Npi and the positive supply rail yIN. The buffer circuit 45 includes a buffer diode 40, a buffer capacitor 41 and a buffer resistor 42. One end of the buffer diode 40 is connected to the first-side winding Nh and the switch 35, and the 缓冲 snubber capacitor 41 is coupled between the other end of the buffer diode 40 and the positive supply rail ViN, and the snubber resistor 42 Then connected in parallel with the snubber capacitor 41. A voltage dividing circuit 50 is coupled between the second primary winding Np2 and the negative power supply rail, and the voltage dividing circuit 5 〇 includes resistors 52 and 55. The resistor 52 is coupled to the control circuit 100 and the negative power supply rail. The resistor 55 is coupled between the resistor 52 and the second primary winding 2. A rectifier 80 is coupled to the factory end of the secondary winding Ns, and a filter capacitor 90 is coupled to the other end of the secondary winding Ns and the other end of the rectifier 80. Please refer to the second figure, which is the equivalent circuit diagram of the switched power converter of the first figure. As shown in the figure, the first primary side winding NP1 and the second primary side winding Np2 have leakage inductances Ln, L2, respectively. Due to the geometrical construction factor of the transformer, the stored energy of the primary winding of the transformer cannot be completely transferred to other windings of the transformer, and the leakage 戚Lii, L is the table = storage, and the reading method is completely transferred. When the switch 35 is turned on, the energy in the large 30 is switched to the changer 3 〇 and the leakage inductance l, and κ is the switch 35, and the face 11 3G 彳 叙 妓 妓 妓 ^ ^ ^ ^ s at the same time leakage inductance L,,, L, 2 stored stored energy will be cyclically transmitted in the loop, if the loop is blocked, it will generate - electric house surge, which can be expressed as V = Lx · dt (5 For the above reasons, the buffer circuit 45 is used to store the leakage inductance L丨丨 in the storage energy to avoid the generation of a high voltage surge to protect the switch 35. The power Pr consumed by the buffer circuit of the buffer circuit milk can be expressed as follows: (6) PR=: R!r=lxL, xIp2^w where Re is the resistance value of the buffer resistor 42; I is the both ends of the buffer resistor 42 L? is the inductance value of the leakage; fs„ is the cutting rate of the switch milk. It can be known from the above equation (6) that the efficiency of the converter of the transformer 3 is reduced, and the performance of the converter is changed. The total winding inductance will produce a significant leakage inductance value, so the simple way to reduce the leakage inductance value is to reduce the relationship between the winding, m electric turtle and 敝 as shown in the following program: μΧ ~~~Π~~~χΝ2 (7) m wheel; a fine magnetic impurity; u is the length of the scale; Ae is the axial cross-sectional area of the transformer 30. ~,, and eucalyptus = the primary winding of the transformer 30 is cut into the first primary winding ^ fish second For the department can reduce the rice, so you can reduce the first side == sense value to improve the performance of the switching power converter. In addition, the second switch city gorge, the storage of Li2 storage can be: the supply capacitor 70 ' so store (4) Inductance u body = put to 100 as a supply crane, it is difficult to read the supply control circuit v The voltage generated by the heart 2 should be 7G. It can be expressed as follows: [Ν^Χ^0 + νρ)] +Vu2 (8) 1332608 '.Ατ You Ί 泮 泮 泮 皆 皆 皆 / 、 、 、 、 、 、 、 They are respectively the second-secondary winding Γ| of the transformer 30; Γ^ι^ The winding im of the Ns is the leakage inductance Li2, which is obtained as shown: 八-XC70XVLI22 =-xLl2Xlp2 vu2=Mxip , c' is the capacitance value of the supply capacitor 70; L 〖2 is the inductance value of the leakage inductance b2.

Because the voltage V1,2 generated by the leakage inductance L·2 makes the voltage Vdd of the supply capacitor 7〇 higher than that of the secondary side winding Ns of the transformer 30, the rectifier 80 will be turned on when the switch 35 is turned off, so Switching power converter output voltage ¥. It can be supplied to the control circuit 1〇〇 via the second primary side winding Np2, so that the leakage inductance Lu of the second primary side winding NP2 can be properly used, which can improve the switching power converter under the condition of light load and no load. Load adjustability. ,

(9) (10) Please refer to the fourth figure, which is a circuit diagram of a control circuit in accordance with a preferred embodiment of the present invention. As shown in the figure, the control circuit 100 of the present invention includes a supply terminal VDD and a ground terminal GND, and a supply capacitor 7 is connected in parallel to receive power. The supply terminal VDD is further connected to the first body 60' and the ground terminal GND is further The second primary side winding Np2 is connected. A voltage detecting terminal VS is coupled to the second primary side winding Np2 via the voltage dividing circuit 50 for detecting a power VDET2 from the first primary winding Np2 of the transformer 30 to detect electricity. It can be expressed as follows: VDET2 = X VnP2 (11) R52 R52 + R55 where Rn is the resistance of resistors 52 and 55 respectively; VNP2 is the voltage of the second primary winding NP2. A current sensing terminal VI' is coupled to the current sensing resistor 37' for receiving the current signal Vcs. An output terminal VG is coupled to an output of a flip-flop 160 for generating a switching signal VTM to switch the transformer 30 through the switch 35. An oscillator 150, which generates a periodic pulse signal 'for activating the switching signal Vp«. a comparator 125 for turning off the switching signal Vm 'one of the negative input eight-terminal connection current sensing terminal VI of the comparator 25 for receiving the current signal Vcs ' at 12 1332608 and the positive input of one of the comparators 125 One of the p=r steam 120 outputs is used to receive a feedback signal vFB. Once the current signal Vcs is higher than the feedback signal Vfb, the switching signal 7 will be cut off. The comparator 125 has an output connected to a reset terminal of the flip-flop 160 for generating a reset signal Vrst and transmitted to the reset terminal of the flip-flop 160 to turn off the switching signal. The error amplifier 120 is configured to generate a feedback signal vFB. The positive input terminal receives a reference voltage V8, and one of the negative input terminals of the error amplifier 120 is coupled to an output of the sample retention circuit 110 for receiving. A sample signal Vs is used to generate the feedback signal Vfb. The sampling and holding circuit 110 has an input coupled to the voltage detecting terminal vs for detecting the detecting voltage VDm from the transformer 30 through the voltage dividing circuit 50 to generate the sampling signal Vs.

The relationship between the voltage Vnp2 of the second primary winding Np2 and the voltage (V.+vF) of the secondary winding Ns can be expressed as follows: V〇+VF =

Nns NnP2 X VnP2 (12) Output voltage V according to equations (11) and (12). Can be expressed as follows:

Vo R52 + R55 Nns R52

NnP2 X VdET2) — Vf (13) From equation (13), the output voltage VQ of the switched power converter can be adjusted. % See the fifth figure, # is a circuit diagram of a switching power converter according to another preferred embodiment of the present invention. As shown in the figure, the transformer 39 of the present invention further includes an auxiliary winding Na2, the auxiliary winding ΝΛ2 of the transformer 39 is connected to the second primary side winding Np2, and the auxiliary winding core is further connected to the supply capacitor via a second diode 65. 70. The grounding terminal GND of the control circuit 100 connects the second primary side winding Np2 and the auxiliary winding I, and the supply terminal is connected to the supply electric valley 70, the first one body 60 and the second diode 65. Since the second primary winding NP2 supplies power to the control circuit 1 when the switch 35 is turned off, the voltage Vdd generated by the supply capacitor 70 is the output voltage v of the switching power converter. Relatedly, if the switching power converter generates an output voltage V under overcurrent and/or short circuit. The voltage V of the second primary winding Np2 (ff2 will be too low to supply sufficient power to the control circuit 10). Therefore, the present invention adds the auxiliary winding Naz. When the switch 35 is turned on, the 13 _ winding 将I will supply The capacitor 70 is charged, so the auxiliary winding is supplied with a power supply to the control circuit 100, which ensures that the control circuit (10) can operate normally. The early embodiment of the invention can reduce the setting of the marrow device. The inductance value of the leakage inductance, the energy of the inductor can be used for the light source to the circuit, so that the switching power converter can be improved and the load is not under load. Therefore, the invention is novel. In the case of China's patent law patent application requirements, it is undoubted that the Bureau will grant patents as soon as possible, and it will be prayed for the purpose. Progressive and available to the industry, it should be submitted in accordance with the law, and the applicants are only required to apply for invention patents according to law. The present invention, which is a preferred embodiment of the present invention, is not intended to limit the features and spirit of the present invention. The shape, structure, and variations and modifications of the present invention are described. Should be packaged 1,332,608 in the invention

[Simple diagram of the diagram] The first diagram is a circuit diagram of a conventional switching power converter; the second diagram is a circuit diagram of the ---------------- FIG. 4 is a circuit diagram of a circuit of the present invention; and a fifth diagram is a switch diagram of another preferred embodiment of the present invention. Circuit diagram. Figure 6 is a cross-sectional view showing a third preferred embodiment of the modular touch panel of the present month; the seventh drawing is a cross-sectional view of the first embodiment of the modular touch panel of the present invention; 8 is a fifth preferred embodiment of the modular touch panel of the present invention - a cross-sectional view; = 9 is a sixth preferred embodiment of the modular touch panel of the present invention - top view, · = ten maps A cross-sectional view of a sixth preferred embodiment of a modular touch panel of the present invention; a tenth embodiment of the first embodiment of the modular touch panel of the present invention; The first part of the grouped touch panel is described in the following section: 10 Transformer 11 Switch! 2 Resistor Seven is a cross-sectional view of a preferred embodiment. % 13 Rectifier 14 Filter Capacitor 15 Resistor 16 Resistor 17 Supply Capacitor »· 18 Diode 19 Buffer Diode 2° Capacitor 21 Buffer Resistor Control Unit 25 15 1332608

30 Transformer 35 Switch 37 Current Sensing Resistor 39 Transformer 40 Buffer Diode 41 Buffer Capacitor 42 Buffer Resistor 45 Buffer Circuit 50 Disgrace Circuit 52 Resistor 55 Resistor 60 First Diode 65 Second Dipole 70 Supply Capacitor 80 Rectifier 90 Filter Capacitor 100 Control Circuit 110 Take Retention Circuit 120 Error Amplifier 125 Comparator 150 Vibrator 160 Positive and Negative GND Ground Terminal Ip Switching Current Lii Leakage Inductance Ll2 Leakage Inductance Να Auxiliary Winding Na2 Auxiliary Winding -----,. Correction replacement page I, ______!_______ · 1332608

m

Np primary side winding Npi first-side winding Np2 second primary winding Vo output voltage Ns - secondary winding - Vadx reflected voltage Vfb feedback voltage VnP2 voltage Vcs current signal Vm switching signal Vdeti detection voltage VdET2 detection Voltage VlN Positive supply rail VHP2 Voltage Vr Reference voltage Vrst Reset signal Vs Sample signal VDD Supply terminal VG Output terminal VI Current sensing terminal VS Voltage detection terminal » Month/1 day repair five replacement page 17

Claims (1)

1332608 X. Patent application scope: L A switching power converter, comprising: • a device, transferring energy from the secondary side of the _ device to a secondary side of the transformer, the changeover is provided with - - the secondary winding and the -second-sub-ship, the first:: the side of the person - the first end - the positive end, the second one of the windings is coupled to a negative power supply; The first primary winding and the second primary winding of the second primary winding and the second primary winding are connected in series between the first primary windings for switching the flow through the transformer side One of the windings switches the current; a control circuit '_' and the second-secondary winding generate a switching signal, Α for switching the switch and adjusting the switching power converter. Connecting the second, the winding and the two control circuit, and the diode, are connected to the negative supply rail and the supply capacitor to charge the supply capacitor. 2. The switching power converter of claim 1, further comprising a current sensing device connected between the switch and the second primary winding, the current sensing device The lion face--the city electric drum--the track number, the control circuit receives the current signal to generate the switching signal. 3. The switching power converter according to claim 1, wherein the second primary winding has a leakage inductance, and when the switch is turned on, the leakage inductance stores a storage energy. The leakage inductance releases the staggered energy to the supply capacitor. 4. The switching power converter of claim 1, wherein the control circuit further comprises: a supply end connecting the supply capacitor and the diode; a ground terminal connected to the supply capacitor to receive a power supply '' and the ground end is connected to the second primary side winding; a voltage detecting end coupled to the second primary side winding to detect a battery; a current sensing end coupled to the switch, receiving a current signal; and an output terminal, the switching signal is generated according to the voltage and the current signal, and the switch is switched to switch the surface. The switching power converter of claim 4, wherein the control circuit further comprises: a sample retention circuit coupled to the voltage detection terminal to detect the The voltage is generated by a sampling signal; an error amplifier coupled to the sample retention circuit, receiving the sampling signal and a reference voltage to generate a feedback signal; a comparator coupled to the error amplifier and the current sensing terminal, receiving The feedback signal breaks the current signal to generate a reset signal; an oscillator generates a periodic pulse signal; and a flip-flop coupled to the oscillator, the comparator and the output to generate the Switching the signal, the periodic pulse signal and the reset signal respectively start and stop the switching signal. 6. A switching power converter comprising: a transformer that transfers energy from one primary side of the transformer to a secondary side of the transformer, the transformer being provided with a first side winding... second a secondary winding and an auxiliary winding, wherein the first end of the first-side winding and the first end of the second primary winding are connected to each other - the positive supply rail and the - negative supply rail, and the auxiliary winding The second primary winding; the switch 2 is connected in series between the second end of the first secondary winding and the second end of the second secondary winding, for switching the current flowing through the transmitter a primary side winding and one of the second primary side windings switch current; '- control circuit, the switch and the second-secondary winding, generating a switching signal for switching the switch and adjusting the switching type The power converter is turned out. The ''Si capacity' is connected to the second "" secondary winding and control circuit, and the power supply is supplied to the battery. The supply capacitor charges a first one, which consumes the Negative power rail and the supply 1332608 • / ,.---- and · ·_ L -_. — second diode, coupled Charging the auxiliary winding supplying the supply capacitor capacitance. 7. If the application of the paste of the sixth handle is turned, it further includes a current sensing device connected between the switch and the second primary winding, the current sensing device is based on the transformer The switching current generates a current signal, and the control circuit receives the current signal to generate the switching signal. 8. The switching power converter of claim 6, wherein the second primary side has a leakage inductance, and the leakage inductance stores a stored energy when the switch is turned on. When the switch is turned off, the leakage inductance releases the stored energy to the supply capacitor. 9. The switching power conversion according to the sixth application of the patent application, wherein the control circuit φ further comprises: a supply end connecting the supply capacitor, the first diode and the second diode; a ground terminal connected to the supply capacitor to receive power, and the ground terminal is connected to the second primary side winding and the auxiliary winding; the voltage detection end is connected to the second primary side winding to detect a voltage; The current sensing end is coupled to the switch and receives a current signal; and an output terminal generates the switching signal according to the voltage and the current signal, and switches the switch to switch the transformer. 10. The switching power converter of claim 9, wherein the control circuit further comprises: a sample-sampling circuit coupled to the voltage detecting terminal to detect the voltage, generating a a sampling amplifier; an error amplifier coupled to the sample retention circuit, receiving the sampling signal and a reference voltage to generate a feedback signal; - comparing the pirates, the error amplifier and the current sensing terminal, receiving the feedback signal and The current signal 'generates a reset signal; a vibrator generates a periodic pulse signal; and a flip-flop coupled to the oscillator, the comparator and the output to generate the switching signal 20 1332608 The periodic pulse signal and the reset signal respectively activate and deactivate the switching signal. Factory--- 11. Switched power converter, comprising: a transformer, a first primary winding and a second primary winding, a first end of the first primary winding And a first end of the second primary winding is connected to one of the switching power converters; a switch is connected in series with one of the second primary ends of the first primary winding and the second primary side a second end of the winding for switching a current flowing through one of the first primary winding and the second primary winding of the transformer; a control circuit coupled to the switch and the transformer Generating a switching signal for switching the switch and adjusting an output of the switching power converter; a supply capacitor connecting the second primary winding and the control circuit to supply power to the control circuit; and 'one or two poles And coupling the transformer and the supply capacitor to charge the supply capacitor. 12. The switching converter as described in the scope of claim 5, further comprising a current sensing device, which is mixed in the cymbal, the switch of the New Zealand-type transformer-switching m--subtraction The road connection signal generates a talk signal.切换 % 13. The switching power converter of claim 5, wherein the transformer has at least a leakage inductance, the leakage inductance stores a scale energy when the switch is turned on, and the switch is turned off, the leakage inductance The stored energy is released to the supply. H. The switching power converter of claim π, wherein the circuit further comprises: a supply end connecting the supply capacitor and the diode: a ground terminal connecting the supply capacitor and the transformer The voltage detection terminal is lightly connected to the transformer, and the test is conducted. The current sense terminal is coupled to the switch, and the one output terminal receives the cut signal according to the current signal, and the switch is switched on. 21 1332608 . Switch the transformer off. Year touch (1曰 correction replacement page J 22 1332608 VII. Designated representative map: (1) The representative representative of the case is: (2). (2) Simple description of the symbol of the representative diagram: 30 Transformer 35 Switch 37 Current sense resistor 40 Buffer diode 41 Buffer capacitor 42 Buffer resistor 45 Buffer circuit 50 Voltage divider circuit 52 Resistance 55 Resistance 60 First Diode 70 Supply capacitor 80 Rectifier 90 Filter capacitor 100 Control circuit Ip Switching current Npi First primary winding Np2 Second primary winding Vo. Output voltage Ns Secondary winding VNP2 Voltage Vcs Current signal Vp«m Switching signal VDET2 detection voltage VlN positive supply rail VDD supply terminal VG output terminal VI current sensing terminal VS voltage detection terminal 8. If there is a chemical formula in this case, please reveal the chemical formula that best shows the characteristics of the invention: