CN210380662U - Secondary auxiliary power supply circuit - Google Patents
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- CN210380662U CN210380662U CN201921616589.2U CN201921616589U CN210380662U CN 210380662 U CN210380662 U CN 210380662U CN 201921616589 U CN201921616589 U CN 201921616589U CN 210380662 U CN210380662 U CN 210380662U
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Abstract
The utility model discloses a secondary auxiliary power circuit, which comprises a power supply, a primary flyback unit, a secondary flyback unit, a first feedback unit and a second feedback unit; the output end of the power supply is connected with the input end of the first-stage flyback unit, the output end of the first-stage flyback unit is connected with the input end of the second-stage flyback unit, and the second-stage flyback unit outputs voltages of different levels; the input end of the first feedback unit is connected with the positive electrode of the output end of the first-stage flyback unit, and the output end of the first feedback unit is connected with the grid electrode of the analog switch in the first-stage flyback unit; the input end of the second feedback unit is connected with the anode of the output end of the secondary flyback unit, and the output end of the second feedback unit is connected with the grid of the analog switch in the secondary flyback unit; the utility model discloses a topological circuit structure of formula switching power supply is swashed to the two-stage has solved high-power switching power supply's problem, also makes to swashs the formula switching power supply output voltage stability, has improved switching power supply's output, reduces the complexity of design, reduces development cost.
Description
Technical Field
The utility model belongs to the technical field of switching power supply technique and specifically relates to a second grade auxiliary power supply circuit is related to.
Background
With the development of power electronic technology, the application of the switching power supply is more and more extensive. The flyback switching power supply has the advantages of simple design, small size and the like, and is widely applied to low-power occasions. With the continuous development of the group-series inverter, the capacity of a single machine is continuously improved, the heat dissipation of a switching tube is more and more in the working process, the common natural cooling mode cannot meet the current system, the air-cooled heat dissipation is needed, the traditional switching power supply is limited by the output power, generally less than 100W, and cannot meet the design requirement of air cooling. Meanwhile, when the system needs multiple paths of different voltage output branches and the power requirements are greatly different, the traditional flyback switching power supply can generate severe output voltage fluctuation, and the condition that the system is unstable in work or cannot work normally is easily caused. This results in a significant limitation in the application of conventional flyback switching power supplies.
Disclosure of Invention
In order to overcome the not enough of above-mentioned prior art, the utility model aims to provide a second grade auxiliary power supply circuit, this circuit adopt the topology circuit structure that the two-stage flyback switching power supply, the effectual problem of having solved high-power switching power supply also makes flyback switching power supply output voltage stable, has improved switching power supply's output, reduces the complexity of design, reduces development cost.
In order to realize the purpose, the utility model discloses a technical scheme is:
a secondary auxiliary power supply circuit comprises a power supply, a primary flyback unit, a secondary flyback unit, a first feedback unit and a second feedback unit; the output end of the power supply is connected with the input end of the primary flyback unit, the output end of the primary flyback unit is connected with the input end of the secondary flyback unit, and the secondary flyback unit outputs voltages of different levels; the input end of the first feedback unit is connected with the anode of the output end of the first-stage flyback unit, and the output end of the first feedback unit is connected with the grid of the analog switch in the first-stage flyback unit; the input end of the second feedback unit is connected with the anode of the output end of the secondary flyback unit, and the output end of the second feedback unit is connected with the grid of the analog switch in the secondary flyback unit.
The primary flyback unit comprises a first transformer T1, a first analog switch Q1, a first diode D1, a first capacitor C1, a first resistor R1, a second rectifier diode D2, a second resistor R2, a second capacitor C2 and a third capacitor C3; the positive electrode of the power supply is connected with the dotted terminal of the primary side of the first transformer T1, the non-dotted terminal of the primary side of the first transformer T1 is connected with the drain electrode of the first analog switch Q1, and the source electrode of the first analog switch Q1 is connected with the negative electrode of the power supply; the anode of the first diode D1 is connected with the drain of a first analog switch Q1, the cathode of the first diode D1 is connected with the anode of a first capacitor C1, the cathode of the first capacitor C1 is connected with the anode of a power supply, and the first resistor R1 is connected in parallel at two ends of a first capacitor C1; the grid electrode of the first analog switch Q1 is connected with the output end of the first feedback unit; the non-dotted terminal of the secondary side of the first transformer T1 is connected with the anode of a second rectifier diode D2, the cathode of the second rectifier diode D2 is connected with the anode of a third capacitor C3, and the cathode of the third capacitor C3 is connected with the dotted terminal of the secondary side of the first transformer T1; the second resistor R2 is connected in series with the second capacitor C2, a series circuit formed by the second resistor R2 and the second capacitor C2 after being connected in series is connected in parallel with the second rectifier diode D2, and the voltage at two ends of the third capacitor C3 is the output voltage of the first-stage flyback unit;
the input end of the first feedback unit is connected with the anode of the third capacitor C3, and the output end of the first feedback unit is connected with the grid of the first analog switch Q1.
The two-stage flyback unit comprises a second transformer T2, a second analog switch Q2, a third diode D3, a fourth capacitor C4, a third resistor R3, a fourth rectifier diode D4, a fourth resistor R4, a fifth capacitor C5, a fifth rectifier diode D5, a fifth resistor R5, a sixth capacitor C6, a sixth rectifier diode D6, a sixth resistor R6, a seventh capacitor C7, an eighth capacitor C8, a ninth capacitor C9 and a tenth capacitor C10; the non-dotted terminal of the primary side of the second transformer T2 is connected with the drain of a second analog switch Q2, and the source of the second analog switch Q2 is connected with the negative electrode of a third capacitor C3; the anode of the third diode D3 is connected with the drain of the second analog switch Q2, the cathode of the third diode D3 is connected with the anode of the fourth capacitor C4, the cathode of the fourth capacitor C4 is connected with the anode of the third capacitor C3, and the third resistor R3 is connected in parallel with two ends of the fourth capacitor C4; the grid electrode of the second analog switch Q2 is connected with the output end of the second feedback unit; the secondary side of the second transformer T2 is provided with a plurality of windings, wherein the non-dotted terminal of the secondary side of the second transformer T2 in each winding is sequentially connected with a rectifier diode and a filter capacitor in series, and the two ends of the rectifier diode are connected with a resistance-capacitance circuit in series with a resistor and a capacitor in parallel, wherein the dotted terminal of the first winding is connected with the non-dotted terminal of the second winding, and the dotted terminal of the second winding is connected with the non-dotted terminal of the third winding.
The secondary side of the second transformer T2 is provided with three windings; the non-dotted terminal of the first secondary side of the second transformer T2 is connected with the anode of a fourth rectifier diode D4, the cathode of the fourth rectifier diode D4 is connected with the anode of an eighth capacitor C8, and the cathode of the eighth capacitor C8 is connected with the dotted terminal of the second secondary side of the second transformer T2; the fourth resistor R4 is connected in series with the fifth capacitor C5, a series circuit formed by the fourth resistor R4 and the fifth capacitor C5 after being connected in series is connected in parallel with the fourth rectifier diode D4, wherein the voltage at two ends of the eighth capacitor C8 is the output voltage Vout1 of the first secondary side of the two-stage flyback unit;
the non-dotted terminal of the second secondary side of the second transformer T2 is connected to the anode of the fifth rectifier diode D5, the cathode of the fifth rectifier diode D5 is connected to the anode of the ninth capacitor C9, and the cathode of the ninth capacitor C9 is connected to the dotted terminal of the second secondary side of the second transformer T2; the fifth resistor R5 is connected in series with the sixth capacitor C6, a series circuit formed by the fifth resistor R5 and the sixth capacitor C6 connected in series is connected in parallel with the fifth rectifier diode D5, wherein the voltage across the ninth capacitor C9 is the output voltage Vout2 of the second secondary side of the secondary flyback unit;
the dotted terminal of the third secondary side of the second transformer T2 is connected to the anode of the sixth rectifying diode D6, the cathode of the sixth rectifying diode D6 is connected to the anode of the tenth capacitor C10, and the cathode of the tenth capacitor C10 is connected to the dotted terminal of the second secondary side of the second transformer T2; the sixth resistor R6 is connected in series with the seventh capacitor C7, a series circuit formed by the sixth resistor R6 and the seventh capacitor C7 connected in series is connected in parallel with the sixth rectifier diode D6, wherein the voltage across the tenth capacitor C10 is the output voltage Vout3 of the third secondary side of the secondary flyback unit;
the input end of the second feedback unit is connected with the anode of an eighth capacitor C8, and the output end of the second feedback unit is connected with the gate of a second analog switch Q2.
According to the working method of the secondary auxiliary power supply circuit, the first feedback unit detects the voltage at two ends of the third capacitor C3, so that the duty ratio of the first analog switch Q1 is controlled, and the output voltage of the primary flyback unit is adjusted; the second feedback unit detects the voltage of the eighth capacitor C8 to control the duty ratio of the second analog switch Q2, and further adjust the output voltage of the secondary flyback unit.
The working process of the primary flyback unit is as follows: when the first analog switch Q1 is switched on, the current reaches the negative pole of the power supply through the positive pole of the power supply, the primary side of the first transformer T1 and the first analog switch Q1, which is equivalent to the energy storage of the primary side winding of the first transformer T1 by the power supply; when the first analog switch Q1 is turned off, current flows out from the non-dotted terminal of the primary side of the first transformer T1, passes through the first diode D1 and the first capacitor C1, and flows into the dotted terminal of the primary side of the first transformer T1; meanwhile, on the secondary side of the first transformer T1, current flows out from the non-dotted terminal of the secondary side of the first transformer T1, passes through the second rectifier diode D2 and the third capacitor C3, and finally flows into the dotted terminal of the secondary side of the first transformer T1, and in the process, the winding on the primary side of the first transformer T1 releases energy; in the process, the first feedback unit detects the output voltage value of the first-stage flyback unit, and synchronously adjusts the duty ratio of the first analog switch Q1, so that the output voltage of the first-stage flyback unit is stable;
in the circuit operation, the control of the secondary flyback unit and the control of the primary flyback unit are mutually independent; when the second analog switch Q2 is turned on, current flows out from the positive electrode of the third capacitor C3, flows into the dotted terminal of the primary side of the second transformer T2, flows out from the non-dotted terminal of the second transformer T2, flows to the negative electrode of the third capacitor C3 through the second analog switch Q2, and the process is a charging process of the primary side inductor of the second transformer T2; when the two analog switches Q2 are turned off, the current on the primary side of the second transformer T2 flows out from the non-dotted terminal, passes through the third diode D3, the fourth capacitor C4 and the third resistor R3, and finally flows to the dotted terminal on the primary side of the second transformer T2; the secondary side current of the second transformer T2 has a plurality of branches, each branch is the secondary side current of the second transformer T2, flows out from the first secondary side non-homonymous terminal of the second transformer T2, passes through a rectifier diode and a filter capacitor which are connected in series, and flows into the homonymous terminal of the second secondary side of the second transformer T2.
Compared with the prior art, the beneficial effects of the utility model are as follows:
1. by adopting the secondary auxiliary power supply circuit, the high-power output side and the low-power output side can be isolated by the transformer, and the mutual interference is reduced.
2. The two-stage power output ends are isolated through the transformer, the output precision of the power supply can be improved, and the power supply bias voltage is smaller than 3V.
3. The output of power, traditional flyback power's output is generally less than 100W, the utility model discloses second grade auxiliary power supply circuit's output is 300W, improves the output of power.
Drawings
Fig. 1 is a circuit topology block diagram of the secondary auxiliary power supply of the present invention.
Fig. 2 is a circuit diagram of the secondary auxiliary power supply of the present invention.
Fig. 3 is a schematic diagram of the operation of the primary flyback unit in the secondary auxiliary power circuit, wherein fig. 3a shows that Q1 is turned on, and fig. 3b shows that Q1 is turned off.
Fig. 4 is a schematic diagram of the operation of the two-stage flyback unit in the two-stage auxiliary power circuit, wherein fig. 4a shows that Q2 is turned on, and fig. 4b shows that Q2 is turned off.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
Fig. 1 is the circuit topology block diagram of the utility model discloses a second grade auxiliary power supply circuit includes that power, one-level fly back the unit, the second grade fly back the unit, first feedback unit and second feedback unit. The output end of the power supply is connected with the input end of the first-stage flyback unit, the output end of the first-stage flyback unit is connected with the input end of the second-stage flyback unit, the second-stage flyback unit outputs voltages of different levels, the input end of the first feedback unit is connected with the positive electrode of the output end of the first-stage flyback unit, and the output end of the first feedback unit is connected with the grid electrode of the analog switch in the first-stage flyback unit. The input end of the second feedback unit is connected with the anode of the output end of the secondary flyback unit, and the output end of the second feedback unit is connected with the grid of the analog switch in the secondary flyback unit.
Fig. 2 is a specific circuit diagram of an embodiment of a secondary auxiliary power circuit, as shown in fig. 2,
the primary flyback unit comprises a first transformer T1, a first analog switch Q1, a first diode D1, a first capacitor C1, a first resistor R1, a second rectifier diode D2, a second resistor R2, a second capacitor C2 and a third capacitor C3. The positive pole of the power supply is connected with the dotted terminal of the primary side of the first transformer T1, the non-dotted terminal of the primary side of the first transformer T1 is connected with the drain electrode of the first analog switch Q1, and the source electrode of the first analog switch Q1 is connected with the negative pole of the power supply. The anode of the first diode D1 is connected with the drain of the first analog switch Q1, the cathode of the first diode D1 is connected with the anode of the first capacitor C1, the cathode of the first capacitor C1 is connected with the anode of the power supply, and the first resistor R1 is connected in parallel at two ends of the first capacitor C1. The gate of the first analog switch Q1 is connected to the output of the first feedback unit. The non-dotted terminal of the secondary side of the first transformer T1 is connected with the anode of the second rectifier diode D2, the cathode of the second rectifier diode D2 is connected with the anode of the third capacitor C3, and the cathode of the third capacitor C3 is connected with the dotted terminal of the secondary side of the first transformer T1. The second resistor R2 is connected in series with the second capacitor C2, a series circuit formed by the second resistor R2 and the second capacitor C2 after being connected in series is connected in parallel with the second rectifier diode D2, and the voltage at two ends of the third capacitor C3 is the output voltage of the first-stage flyback unit.
The input end of the first feedback unit is connected with the anode of the third capacitor C3, and the output end of the first feedback unit is connected with the grid of the first analog switch Q1.
The two-stage flyback unit comprises a second transformer T2, a second analog switch Q2, a third diode D3, a fourth capacitor C4, a third resistor R3, a fourth rectifier diode D4, a fourth resistor R4, a fifth capacitor C5, a fifth rectifier diode D5, a fifth resistor R5, a sixth capacitor C6, a sixth rectifier diode D6, a sixth resistor R6, a seventh capacitor C7, an eighth capacitor C8, a ninth capacitor C9 and a tenth capacitor C10. The non-dotted terminal of the primary side of the second transformer T2 is connected to the drain of the second analog switch Q2, and the source of the second analog switch Q2 is connected to the negative electrode of the third capacitor C3. The anode of the third diode D3 is connected with the drain of the second analog switch Q2, the cathode of the third diode D3 is connected with the anode of the fourth capacitor C4, the cathode of the fourth capacitor C4 is connected with the anode of the third capacitor C3, and the third resistor R3 is connected in parallel with two ends of the fourth capacitor C4. The gate of the second analog switch Q2 is connected to the output of the second feedback unit. The secondary side of the second transformer T2 is provided with a plurality of windings, wherein the non-dotted ends of the secondary side of the second transformer T2 in each winding are sequentially connected with a rectifier diode and a filter capacitor in series, and meanwhile, the two ends of the rectifier diode are connected with a resistance-capacitance circuit in series with a resistor and a capacitor in parallel.
The non-dotted terminal of the first secondary side of the second transformer T2 is connected to the anode of the fourth rectifying diode D4, the cathode of the fourth rectifying diode D4 is connected to the anode of the eighth capacitor C8, and the cathode of the eighth capacitor C8 is connected to the dotted terminal of the second secondary side of the second transformer T2. The fourth resistor R4 is connected in series with the fifth capacitor C5, a series circuit formed by the fourth resistor R4 and the fifth capacitor C5 connected in series is connected in parallel with the fourth rectifying diode D4, and the voltage across the eighth capacitor C8 is the output voltage Vout1 of the first secondary side of the two-stage flyback unit.
The non-dotted terminal of the second secondary side of the second transformer T2 is connected to the anode of the fifth rectifier diode D5, the cathode of the fifth rectifier diode D5 is connected to the anode of the ninth capacitor C9, and the cathode of the ninth capacitor C9 is connected to the dotted terminal of the second secondary side of the second transformer T2. The fifth resistor R5 is connected in series with the sixth capacitor C6, a series circuit formed by the fifth resistor R5 and the sixth capacitor C6 connected in series is connected in parallel with the fifth rectifying diode D5, and a voltage across the ninth capacitor C9 is an output voltage Vout2 of the second secondary side of the secondary flyback unit.
The dotted terminal of the third secondary side of the second transformer T2 is connected to the anode of the sixth rectifying diode D6, the cathode of the sixth rectifying diode D6 is connected to the anode of the tenth capacitor C10, and the cathode of the tenth capacitor C10 is connected to the dotted terminal of the second secondary side of the second transformer T2. The sixth resistor R6 is connected in series with the seventh capacitor C7, a series circuit formed by the sixth resistor R6 and the seventh capacitor C7 connected in series is connected in parallel with the sixth rectifying diode D6, wherein the voltage across the tenth capacitor C10 is the output voltage Vout3 of the third secondary side of the two-stage flyback unit.
The input end of the second feedback unit is connected with the anode of an eighth capacitor C8, and the output end of the second feedback unit is connected with the gate of a second analog switch Q2.
The working principle of the circuit is as follows:
the first feedback unit detects the voltage across the third capacitor C3 to control the duty ratio of the first analog switch Q1, and further adjust the output voltage of the first-stage flyback unit. The second feedback unit detects the voltage of the eighth capacitor C8 to control the duty ratio of the second analog switch Q2, and further adjust the output voltage of the secondary flyback unit.
Fig. 3 is a working schematic diagram of a primary flyback unit in the secondary auxiliary power circuit. As shown in the figure, when the first analog switch Q1 is turned on, the current path is as shown in fig. 3a, and the current reaches the negative pole of the power supply through the positive pole of the power supply, the primary side of the first transformer T1, and the first analog switch Q1, which is equivalent to the power supply storing energy to the primary side winding of the first transformer T1; when the first analog switch Q1 is turned off, the current path is as shown in fig. 3b, and the current flows from the non-dotted terminal of the primary side of the first transformer T1, through the first diode D1 and the first capacitor C1, and into the dotted terminal of the primary side of the first transformer T1. Meanwhile, on the secondary side of the first transformer T1, current flows from the non-dotted terminal of the secondary side of the first transformer T1, passes through the second rectifier diode D2 and the third capacitor C3, and finally flows into the dotted terminal of the secondary side of the first transformer T1. In the process, the winding on the primary side of the first transformer T1 releases energy. In the process, the first feedback unit detects the output voltage value of the first-stage flyback unit, and synchronously adjusts the duty ratio of the first analog switch Q1, so that the output voltage of the first-stage flyback unit is stable.
In the circuit operation, the control of the secondary flyback unit and the control of the primary flyback unit are mutually independent. When the second analog switch Q2 is turned on, the current path is as shown in fig. 4a, and the current flows from the positive terminal of the third capacitor C3, flows into the dotted terminal on the primary side of the second transformer T2, flows from the non-dotted terminal of the second transformer T2, passes through the second analog switch Q2, and flows to the negative terminal of the third capacitor C3. This process is the charging process of the primary inductor of the second transformer T2. When the two analog switches Q2 are turned off, the current path is as shown in fig. 4b, and the current on the primary side of the second transformer T2 flows from the non-dotted terminal, passes through the third diode D3, the fourth capacitor C4 and the third resistor R3, and finally flows to the dotted terminal on the primary side of the second transformer T2. The secondary side current of the second transformer T2 has three branches, the first branch is that the secondary side current of the second transformer T2 flows out from the first secondary side non-dotted terminal of the second transformer T2, passes through the fourth rectifier diode D4, enters the anode of the eighth capacitor C8, and flows out from the cathode of the eighth capacitor C8 and flows into the dotted terminal of the second secondary side of the second transformer T2. The second branch is that the secondary side current of the second transformer T2 flows out from the non-dotted terminal of the second secondary side of the second transformer T2, passes through the fifth diode D5, flows into the anode of the ninth capacitor C9, flows out from the cathode of the ninth capacitor C9, and enters the dotted terminal of the second secondary side of the second transformer T2. The third branch is that the secondary side current of the second transformer T2 flows from the non-dotted terminal of the third secondary side, and returns to the dotted terminal of the third secondary side through the tenth capacitor C10 and the sixth diode D6.
Claims (4)
1. A secondary auxiliary power supply circuit, characterized by: the feedback circuit comprises a power supply, a primary flyback unit, a secondary flyback unit, a first feedback unit and a second feedback unit; the output end of the power supply is connected with the input end of the primary flyback unit, the output end of the primary flyback unit is connected with the input end of the secondary flyback unit, and the secondary flyback unit outputs voltages of different levels; the input end of the first feedback unit is connected with the anode of the output end of the first-stage flyback unit, and the output end of the first feedback unit is connected with the grid of the analog switch in the first-stage flyback unit; the input end of the second feedback unit is connected with the anode of the output end of the secondary flyback unit, and the output end of the second feedback unit is connected with the grid of the analog switch in the secondary flyback unit.
2. A secondary auxiliary power supply circuit as claimed in claim 1, wherein: the primary flyback unit comprises a first transformer (T1), a first analog switch (Q1), a first diode (D1), a first capacitor (C1), a first resistor (R1), a second rectifier diode (D2), a second resistor (R2), a second capacitor (C2) and a third capacitor (C3); the positive electrode of the power supply is connected with the dotted terminal of the primary side of the first transformer (T1), the non-dotted terminal of the primary side of the first transformer (T1) is connected with the drain electrode of the first analog switch (Q1), and the source electrode of the first analog switch (Q1) is connected with the negative electrode of the power supply; the anode of the first diode (D1) is connected with the drain of the first analog switch (Q1), the cathode of the first diode (D1) is connected with the anode of a first capacitor (C1), the cathode of the first capacitor (C1) is connected with the anode of a power supply, and the first resistor (R1) is connected to two ends of the first capacitor (C1) in parallel; the gate of the first analog switch (Q1) is connected with the output end of the first feedback unit; the non-dotted terminal of the secondary side of the first transformer (T1) is connected with the anode of a second rectifier diode (D2), the cathode of the second rectifier diode (D2) is connected with the anode of a third capacitor (C3), and the cathode of the third capacitor (C3) is connected with the dotted terminal of the secondary side of the first transformer (T1); the second resistor (R2) is connected with the second capacitor (C2) in series, a series circuit formed by the second resistor (R2) and the second capacitor (C2) which are connected in series is connected with the second rectifier diode (D2) in parallel, and the voltage at two ends of the third capacitor (C3) is the output voltage of the primary flyback unit;
the input end of the first feedback unit is connected with the anode of a third capacitor (C3), and the output end of the first feedback unit is connected with the grid electrode of a first analog switch (Q1).
3. A secondary auxiliary power supply circuit as claimed in claim 1, wherein: the secondary flyback unit comprises a second transformer (T2), a second analog switch (Q2), a third diode (D3), a fourth capacitor (C4), a third resistor (R3), a fourth rectifier diode (D4), a fourth resistor (R4), a fifth capacitor (C5), a fifth rectifier diode (D5), a fifth resistor (R5), a sixth capacitor (C6), a sixth rectifier diode (D6), a sixth resistor (R6), a seventh capacitor (C7), an eighth capacitor (C8), a ninth capacitor (C9) and a tenth capacitor (C10); the non-dotted terminal of the primary side of the second transformer (T2) is connected with the drain electrode of a second analog switch (Q2), and the source electrode of the second analog switch (Q2) is connected with the negative electrode of a third capacitor (C3); the anode of the third diode (D3) is connected with the drain of the second analog switch (Q2), the cathode of the third diode (D3) is connected with the anode of the fourth capacitor (C4), the cathode of the fourth capacitor (C4) is connected with the anode of the third capacitor (C3), and the third resistor (R3) is connected to two ends of the fourth capacitor (C4) in parallel; the gate of the second analog switch (Q2) is connected to the output of a second feedback unit; the secondary side of the second transformer (T2) is provided with a plurality of windings, wherein the non-homonymous end of the secondary side of the second transformer (T2) in each winding is sequentially connected with a rectifier diode and a filter capacitor in series, the two ends of the rectifier diode are connected with a resistance-capacitance circuit in series connection with a resistor and a capacitor, the homonymous end of the first winding is connected with the non-homonymous end of the second winding, and the homonymous end of the second winding is connected with the non-homonymous end of the third winding.
4. A secondary auxiliary power supply circuit as claimed in claim 3, wherein: the non-dotted terminal of the first secondary side of the second transformer (T2) is connected with the anode of a fourth rectifying diode (D4), the cathode of the fourth rectifying diode (D4) is connected with the anode of an eighth capacitor (C8), the cathode of an eighth capacitor (C8) is connected with the dotted terminal of the second secondary side of the second transformer (T2), the fourth resistor (R4) is connected with a fifth capacitor (C5) in series, a series circuit formed by connecting a fourth resistor (R4) and the fifth capacitor (C2) in series is connected with a fourth rectifying diode (D4) in parallel, and the voltage at the two ends of the eighth capacitor (C8) is the output voltage Vout1 of the first secondary side of the secondary flyback unit;
the non-dotted terminal of the second secondary side of the second transformer (T2) is connected with the anode of a fifth rectifier diode (D5), the cathode of the fifth rectifier diode (D5) is connected with the anode of a ninth capacitor (C9), and the cathode of the ninth capacitor (C9) is connected with the dotted terminal of the second secondary side of the second transformer (T2); the fifth resistor (R5) is connected with a sixth capacitor (C6) in series, a series circuit formed by connecting the fifth resistor (R5) and the sixth capacitor (C6) in series is connected with a fifth rectifying diode (D5) in parallel, and the voltage at two ends of the ninth capacitor (C9) is the output voltage Vout2 of the second secondary side of the two-stage flyback unit;
the dotted terminal of the third secondary side of the second transformer (T2) is connected with the anode of a sixth rectifier diode (D6), the cathode of the sixth rectifier diode (D6) is connected with the anode of a tenth capacitor (C10), and the cathode of the tenth capacitor (C10) is connected with the dotted terminal of the second secondary side of the second transformer (T2); the sixth resistor (R6) is connected with the seventh capacitor (C7) in series, a series circuit formed by connecting the sixth resistor (R6) and the seventh capacitor (C7) in series is connected with the sixth rectifying diode (D6) in parallel, and the voltage at two ends of the tenth capacitor (C10) is the output voltage Vout3 of the third secondary side of the two-stage flyback unit;
the input end of the second feedback unit is connected with the anode of an eighth capacitor (C8), and the output end of the second feedback unit is connected with the grid electrode of a second analog switch (Q2).
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| CN201921616589.2U CN210380662U (en) | 2019-09-26 | 2019-09-26 | Secondary auxiliary power supply circuit |
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| CN201921616589.2U CN210380662U (en) | 2019-09-26 | 2019-09-26 | Secondary auxiliary power supply circuit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110557028A (en) * | 2019-09-26 | 2019-12-10 | 特变电工西安电气科技有限公司 | Secondary auxiliary power supply circuit and working method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110557028A (en) * | 2019-09-26 | 2019-12-10 | 特变电工西安电气科技有限公司 | Secondary auxiliary power supply circuit and working method |
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