Flyback recovery power supply circuit
Through the combination of resistor and capacitor parallel structure and photoelectric coupling circuit, the existing flyback recovery power circuit has solved the problem of complex structure and poor safety performance, and a simple structure, low cost and high safety performance power circuit design is realized.
Patent Information
- Application Number
- CN201810096905.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- Filing Date
- 2018-01-31
- Publication Date
- 2024-12-20
- Estimated Expiration
- 2038-01-31
AI Technical Summary
The existing flyback recovery power supply circuit has a complex structure, wastes equipment, isolates work efficiency, and lacks isolation between the high-voltage end and the low-voltage end, resulting in poor safety performance.
The structure of resistor and capacitor is connected in parallel to achieve DC limit, and the high-voltage end and low-voltage end are isolated through the photoelectric coupling circuit to ensure electrical insulation.
It achieves simple structure and cost savings, and ensures isolation between the high-voltage end and the low-voltage end through the use of the optoelectronic coupling circuit, improving the safety performance of the circuit.
Smart Images
Figure CN108155782B_ABST
Abstract
Description
Technical Field
[0001] The invention relates to a circuit, in particular to a flyback recovery power supply circuit. Background Art
[0002] Currently, the flyback recovery power supply circuits on the market all use complex circuit connection structures. This connection structure not only wastes equipment, but also has low work efficiency and is extremely time-consuming. It does not use optocoupler circuits to ensure isolation between the high-voltage end and the low-voltage end, and has poor safety performance. Summary of the invention
[0003] The technical problem to be solved by the present invention is to provide a flyback recovery power supply circuit, which limits direct current through a structure in which a resistor and a capacitor are connected in parallel, and uses alternating current. Not only is the structure very simple, but it also consumes fewer electronic components, saving costs. The use of a photoelectric coupling circuit ensures the isolation of the high-voltage end from the low-voltage end, while ensuring the electrical insulation between these circuits or systems, thereby playing a role in safety protection.
[0004] The present invention solves the above technical problems through the following technical solutions: a flyback recovery power supply circuit, characterized in that it includes a power supply integrated circuit and a photoelectric coupling circuit, wherein the power supply integrated circuit includes a power management chip, a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a sixth resistor, a first capacitor, a second capacitor, a third capacitor, a fourth capacitor, and a fifth capacitor, and the photoelectric coupling module includes a photoelectric coupler, a sliding rheostat, a first light-emitting diode, a second light-emitting diode, a first voltage-stabilizing diode, a second voltage-stabilizing diode, a sixth capacitor, a seventh capacitor, a seventh resistor, an eighth resistor, a ninth resistor, a tenth resistor, an eleventh resistor, and a twelfth resistor, the power supply integrated circuit is connected to the photoelectric coupling circuit, the first resistor is connected in series with the first capacitor, the first capacitor is connected in parallel with the second capacitor, the first capacitor and the second capacitor are connected to pin No. 1 of the power management chip, the second resistor is connected in parallel with the third capacitor, the second resistor and the third capacitor are connected to pin No. 2 of the power management chip, the fourth capacitor is connected in parallel with the third resistor, the fourth capacitor and the sixth resistor are connected to pin No. 3 of the power management chip, the third resistor is connected to pin No. 4 of the power management chip, the sixth resistor is connected in parallel with the fourth resistor, and the fourth resistor is connected to pin No. 5 of the power management chip. The resistors are connected in series, the sixth pin of the power management chip is connected to the fourth resistor, the eighth pin of the power management chip is connected to the fifth capacitor, the fifth pin of the power management chip is connected to the power supply, the seventh pin of the power management chip is grounded, the first resistor, the second resistor, the third resistor, the fifth resistor, the sixth resistor, the second capacitor, the third capacitor, the fourth capacitor, and the fifth capacitor are all grounded, the positive electrode of the photocoupler is connected to the first pin of the power management chip, the negative electrode of the photocoupler is grounded, the photocoupler is connected in parallel with the first light-emitting diode, the first light-emitting diode is connected in parallel with the eighth resistor, the eighth resistor is connected in series with the seventh resistor, and the seventh The resistor is connected in series with the ninth resistor, the ninth resistor is connected in parallel with the tenth resistor, the tenth resistor is connected in parallel with the eleventh resistor, the eleventh resistor is connected in series with the second light-emitting diode, the second light-emitting diode is connected in parallel with the sliding rheostat, the sliding rheostat is connected in series with the twelfth resistor, the twelfth resistor is connected in series with the ninth resistor, the ninth resistor is connected in series with the sixth capacitor, the sixth capacitor is connected in series with the first Zener diode, the first Zener diode is connected in parallel with the second Zener diode, the second Zener diode is connected in parallel with the seventh capacitor, the seventh capacitor is connected in series with the tenth resistor, the first Zener diode, the second Zener diode, the second light-emitting diode, and the sliding rheostat are all grounded.
[0005] Preferably, the first light emitting diode is a photosensitive diode.
[0006] Preferably, the positive electrode end of the tube body of the first voltage stabilizing diode and the second voltage stabilizing diode is planar, and the negative electrode end is semicircular.
[0007] The positive and progressive effect of the present invention is that the flyback recovery power supply circuit limits direct current through a structure in which a resistor and a capacitor are connected in parallel, and uses alternating current. Not only is the structure very simple, but it also consumes fewer electronic components, saving costs. The use of a photoelectric coupling circuit ensures isolation between the high-voltage end and the low-voltage end, while ensuring electrical insulation between these circuits or systems, thereby playing a role in safety protection. BRIEF DESCRIPTION OF THE DRAWINGS
[0008] Figure 1 Figure of the present invention.
[0009] Figure 2 This is a power supply integrated circuit diagram of the present invention.
[0010] Figure 3 This is a photoelectric coupling circuit diagram of the present invention. DETAILED DESCRIPTION
[0011] Preferred embodiments of the present invention are given below in conjunction with the accompanying drawings to illustrate the technical solutions of the present invention in detail.
[0012] like Figures 1 to 3As shown, the flyback recovery power supply circuit of the present invention includes a power supply integrated circuit A and a photoelectric coupling circuit B connected to each other, wherein the power supply integrated circuit A includes a power management chip U1, a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a fifth resistor R5, a sixth resistor R6, a first capacitor C1, a second capacitor C2, a third capacitor C3, a fourth capacitor C4, and a fifth capacitor C5, and the photoelectric coupling module B includes a photoelectric coupler U2, a sliding rheostat VR1, a first light-emitting diode LED1, a second light-emitting diode LED2, a first voltage-stabilizing diode ZD1, a second voltage-stabilizing diode ZD2, a sixth capacitor C6, a seventh capacitor C7, a seventh resistor R7, an eighth resistor R8, a ninth resistor R9, a first resistor R10, a second resistor R11, a second resistor R12, a third resistor R13, a fourth resistor R14, a fifth capacitor C15, and a photoelectric coupling module B includes a photoelectric coupler U2, a sliding rheostat VR1, a first light-emitting diode LED1, a second light-emitting diode LED2, a first voltage-stabilizing diode ZD1, a second voltage-stabilizing diode ZD2, a sixth capacitor C6, a seventh capacitor C7, a seventh resistor R7, an eighth resistor R8, a ninth resistor R9, a first resistor R14, a second resistor R15, a third resistor R16, a first resistor R17, a second resistor R18, a first resistor R19, a second resistor R19, a first resistor R10, a second resistor R11 The tenth resistor R10, the eleventh resistor R11, and the twelfth resistor R12, the power integrated circuit A is connected to the photoelectric coupling circuit B, the first resistor R1 is connected in series with the first capacitor C1, the first capacitor C1 is connected in parallel with the second capacitor C2, the first capacitor C1 and the second capacitor C2 are connected to pin No. 1 of the power management chip U1, the second resistor R2 is connected in parallel with the third capacitor C3, the second resistor R2 and the third capacitor C3 are connected to pin No. 2 of the power management chip U1, the fourth capacitor C4 is connected in parallel with the third resistor R3, the fourth capacitor C4 and the sixth resistor C6 are connected to pin No. 3 of the power management chip U1, the third resistor R3 is connected to pin No. 4 of the power management chip U1, the sixth resistor C6 is connected in parallel with the fourth resistor R4, and the fourth resistor R4 is connected The fifth resistor R5 is connected in series, the sixth pin of the power management chip U1 is connected to the fourth resistor R4, the eighth pin of the power management chip U1 is connected to the fifth capacitor C5, the fifth pin of the power management chip U1 is connected to the power supply, the seventh pin of the power management chip U1 is grounded, the first resistor R1, the second resistor R2, the third resistor R3, the fifth resistor R5, the sixth resistor R6, the second capacitor C2, the third capacitor C3, the fourth capacitor C4, and the fifth capacitor C5 are all grounded, the positive electrode of the photocoupler U2 is connected to the first pin of the power management chip U1, the negative electrode of the photocoupler U2 is grounded, the photocoupler U2 is connected in parallel with the first light-emitting diode LED1, the first light-emitting diode LED1 is connected in parallel with the eighth resistor R8, and the eighth resistor R8 is connected in parallel. The seventh resistor R7 is connected in series with the ninth resistor R9, the ninth resistor R9 is connected in parallel with the tenth resistor R10, the tenth resistor R10 is connected in parallel with the eleventh resistor R11, the eleventh resistor R11 is connected in series with the second light-emitting diode LED2, the second light-emitting diode LED2 is connected in parallel with the sliding rheostat VR1, the sliding rheostat VR1 is connected in series with the twelfth resistor R12, the twelfth resistor R12 is connected in series with the ninth resistor R9, the ninth resistor R9 is connected in series with the sixth capacitor C6, the sixth capacitor C6 is connected in series with the first voltage zener diode ZD1, the first voltage zener diode ZD1 is connected in parallel with the second voltage zener diode ZD2, the second voltage zener diode ZD2 is connected in parallel with the seventh capacitor C7, the seventh capacitor C7 is connected in series with the tenth resistor R10,The first voltage zener diode ZD1, the second voltage zener diode ZD2, the second light emitting diode LED2, and the sliding resistor VR1 are all grounded.
[0013] The working principle of the present invention is as follows: the first resistor in the flyback recovery power supply circuit is connected in series with the first capacitor to limit the charging and discharging speed of the capacitor. When the power is turned on, the capacitor will not be saturated all at once, which plays a buffering role. The second resistor and the third capacitor are connected in parallel to limit the direct current and allow the alternating current signal to pass through, so that the signal is fully amplified. When the amplified alternating current signal passes through the power management chip, the power management chip will transmit the alternating current signal to the photoelectric coupling circuit through the first pin. The photoelectric coupler is also called a photoelectric isolator or an optical coupler, sometimes referred to as an optical coupler. It is a device that uses light as a coupling medium and realizes electrical isolation between input and output through the transmission of optical signals. It can transmit electrical signals between circuits or systems to ensure the isolation of the high-voltage end and the low-voltage end, and at the same time ensure the electrical insulation between these circuits or systems, which plays a safety role. The photoelectric coupling circuit is mainly composed of a photoelectric coupler, a first light-emitting diode, and a second light-emitting diode. The first light-emitting diode is a light receiver, and the second light-emitting diode is a light source. The light source can convert electrical signals into optical signals, the photoelectric coupler can convert optical signals into electrical signals, and the light receiver can convert optical signals into electrical signals. Therefore, the photoelectric coupling circuit can realize the conversion of electricity, light, and electricity.
[0014] The first light emitting diode LED1 is a photosensitive diode, which is relatively sensitive to light signals, can detect light signals immediately, and can convert light signals into electrical signals.
[0015] The first voltage zener diode ZD1 and the second voltage zener diode ZD2 have a flat positive electrode end and a semicircular negative electrode end for overvoltage protection.
[0016] The model of the power management chip may be MT7822A, which has a simple structure and low cost.
[0017] In summary, the flyback recovery power supply circuit of the present invention limits direct current through an alternating current structure by connecting a resistor and a capacitor in parallel. Not only is the structure very simple, but it also consumes fewer electronic components, saving costs. The use of a photoelectric coupling circuit ensures isolation between the high-voltage end and the low-voltage end, while ensuring electrical insulation between these circuits or systems, thereby playing a role in safety protection.
[0018] The specific embodiments described above further illustrate the technical problems solved, technical solutions and beneficial effects of the present invention. It should be understood that the above are only specific embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.
Claims
1. A flyback recovery power supply circuit, It is characterized in that It includes a power supply integrated circuit and a photoelectric coupling circuit; the power supply integrated circuit is connected to the photoelectric coupling circuit; The power integrated circuit includes a power management chip, a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a sixth resistor, a first capacitor, a second capacitor, a third capacitor, a fourth capacitor, and a fifth capacitor; One end of the second capacitor is grounded, and the other end is connected to pin 1 of the power management chip; the first resistor is connected in series with the first capacitor and then connected in parallel with the second capacitor; After the second resistor and the third capacitor are connected in parallel, one end is grounded, and the other end is connected to the second pin of the power management chip; the third pin of the power management chip is grounded after being connected in parallel with the fourth capacitor and the sixth resistor; the fourth pin of the power management chip is grounded after being connected to the third resistor; the fifth pin of the power management chip is grounded, the sixth pin of the power management chip is connected to the ground end of the sixth resistor after being connected in series with the fourth resistor and the fifth resistor, the seventh pin of the power management chip is connected to the power supply, and the eighth pin of the power management chip is grounded through the fifth capacitor; The photoelectric coupling module includes a photoelectric coupler, a sliding resistor, a first voltage zener diode, a second voltage zener diode, a sixth capacitor, a seventh capacitor, a seventh resistor, an eighth resistor, a ninth resistor, a tenth resistor, and a twelfth resistor; The positive output electrode of the photocoupler is connected to the pin No. 1 of the power management chip, the negative output electrode of the photocoupler is grounded, the positive input electrode of the photocoupler is connected to the negative input electrode of the photocoupler via the eighth resistor, one end of the seventh resistor is connected to the positive input electrode of the photocoupler, and the other end is connected to the power supply; one end of the ninth resistor is connected to the power supply, and the other end is connected to the negative input electrode of the photocoupler via the sixth capacitor, and the other end of the ninth resistor is also grounded via the twelfth resistor and the sliding rheostat; The negative input electrode of the photocoupler is grounded via the first voltage stabilizing diode and the second diode connected in parallel; one end of the tenth resistor is connected to the power supply, and the other end is grounded via the seventh capacitor; The model of the power management chip is MT7822A; The photoelectric coupling module also includes an eleventh resistor and a second light-emitting diode. The eleventh resistor and the second light-emitting diode are connected in series, and one end is connected to the power supply, and the other end is grounded; the first voltage-stabilizing diode and the second voltage-stabilizing diode have a flat positive electrode end and a semicircular negative electrode end.