Synchronous rectification drive device and method for converter
A technology of synchronous rectification and driving device, which is applied to the conversion device of output power, the conversion of DC power input to DC power output, the conversion of irreversible AC power input to DC power output, etc. Large, current backflow, affecting the normal operation of the circuit, etc., to avoid current backflow, low cost, and ensure normal operation.
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specific Embodiment approach 1
[0022] Such as figure 1 As shown, an LLC resonant converter includes a first synchronous rectifier SR1, a second synchronous rectifier SR2, a first primary power transistor Q1, a second primary power transistor Q2, a controller, and the like. The synchronous rectification drive device for converters in Embodiment 1 of the present invention includes a first current transformer detection module, a second current transformer detection module, a first latch Q3, a second latch Q4, a first and gate AND1 and a second AND gate AND2.
[0023] The first current transformer detection module is coupled between the first synchronous rectifier SR1 and the first latch Q3, the output of the first latch Q3 is coupled to the input of the first AND gate AND1, and the first AND The input of the gate AND1 is also coupled with a control signal of the first primary side power transistor Q1.
[0024] The first current transformer detection module detects the current in the first synchronous rectifi...
specific Embodiment approach 2
[0034] Such as image 3 As shown, the difference between this specific embodiment and the first specific embodiment is that: use image 3 The n diodes connected in series (n is an integer, n≥0) shown in the dashed box in the middle are replaced by the n1th diode Dn1 and the n2th diode Dn2 respectively figure 1 The first resistor R1 and the third resistor R3 in. This specific embodiment can control the magnitude of the inductive energy loss of the current transformer. Moreover, the number of the n1th diode Dn1 and the number of the n2th diode Dn2 may be different.
[0035] When n≥1, such as image 3 As shown, in this specific implementation manner, the first current transformer detection module includes a first current transformer CT1, a third diode D3, at least one n1th diode Dn1, and a fourth diode D4; The primary winding of a current transformer CT1 is coupled to the first synchronous rectifier SR1, and the secondary winding of the first current transformer CT1 is connec...
specific Embodiment approach 3
[0037] Such as Figure 4 As shown, the difference between this specific embodiment and specific embodiment 1 is that the first secondary winding of the first current transformer and the second secondary winding of the second current transformer are omitted, and a current transformer is additionally provided. reset circuit.
[0038] Such as Figure 4 As shown, in this specific embodiment, the first current transformer detection module includes a first current transformer CT1, a seventh diode D7, a second resistor R2, a first resistor R1, a fourth diode D4, The first comparator CMP1; the primary winding of the first current transformer CT1 is coupled to the first synchronous rectifier SR1, and the seventh diode D7 is connected to the second resistor R2 and connected across the secondary side of the first current transformer CT1 On the winding, it is used to reset the first current transformer CT1. The fourth diode D4 is connected to the first resistor R1 and then connected acr...
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