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전자부품 데이터시트 검색엔진 |
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전자부품 데이터시트 검색엔진 |
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SSC3S901 데이터시트(PDF) 11 Page - Sanken electric |
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SSC3S901 데이터시트(HTML) 11 Page - Sanken electric |
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11 / 32 page  SSC3S900 Series SSC3S900 - DSJ Rev.2.4 SANKEN ELECTRIC CO.,LTD. 11 Apr. 01, 2016 http://www.sanken-ele.co.jp © SANKEN ELECTRIC CO.,LTD. 2013 In the current resonant power supply, Q(H) and Q(L) are alternatively turned on and off. The on time and off time of them are equal. There is a dead time between Q(H) on period and Q(L) on period. During the dead time, both Q(H) and Q(L) are in off status. The current resonant power supply is controlled by the frequency control. When the output voltage decreases, the IC makes the switching frequency low so that the output power is increased and the output voltage is kept constant. This control must operate in the inductance area (fSW > f0). Since the winding current is delayed from the winding voltage in the inductance area, the turn-on operation is ZCS (Zero Current Switching) and the turn-off operation is ZVS (Zero Voltage Switching). Thus, the switching loss of Q(H) and Q(L) is nearly zero, In the capacitance area (fSW < f0), the current resonant power supply operates as follows. When the output voltage decreases, the switching frequency is decreased, and then the output power is more decreased. Thus, the output voltage cannot be kept constant. Since the winding current goes ahead of the winding voltage in the capacitance area, the operation with hard switching occurs in Q(H) and Q(L). Thus, the power loss increases. This operation in the capacitance area is called the capacitive mode operation. The current resonant power supply must be operated without the capacitive mode operation (refer to Section 8.12 about details of it). Figure 8-4 shows the basic operation waveform of current resonant power supply (see Figure 8-3 about the symbol in Figure 8-4). The current resonant waveforms in normal operation are divided a period A to a period F. The current resonant power supply operates in the each period as follows. In following description, ID(H) is the current of Q(H), ID(L) is the current of Q(L), VF(H) is the forwerd voltage of Q(H), VF(L) is the forwerd voltage of Q(L), IL is the current of LR, VIN is an input voltage, VCi is Ci voltage, and VCV is CV voltage. 1) Period A When Q(H) is ON, energy is stored into the series resonant circuit by ID(H) flowing through the resonant circuit and the transformer as shown in Figure 8-5. At the same time, the energy is transferred to the secondary circuit. When the primary winding voltage can not keep the secondary rectifier ON, the energy to the secondary circuit is stopped. 2) Period B After the secondary side current becomes zero, the resonant current flows to the primary side only as shown in Figure 8-6 and Ci is charged by it. ID(L) ID(H) IS1 VGL VGH VDS(L) ICi VCi IS2 A B C D E F VIN+VF(H) VDS(H) VIN Figure 8-4 The basic operation waveforms of current resonant power supply Cv Ci LR Q(H) Q(L) LP ON OFF ID(H) VIN S1 S2 IS1 VCV VCi Figure 8-5 Operation in period A Cv Ci LR Q(H) Q(L) LP ON OFF ID(H) VIN S1 S2 Figure 8-6 Operation in period B |
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