An ultra-high efficiency power supply circuit

Abstract

The utility model relates to the technical field of switching power supply discloses a kind of superhigh efficiency power supply circuit with better current stability, including the current signal for receiving front stage side input, and the current signal of input is rectified / filtration / voltage reduction processing, to output the power input module (110) of a voltage signal, secondary rectification module (120) and secondary constant current and constant voltage module (130), wherein, the output end of secondary constant current and constant voltage module (130) is connected with the signal input end of power input module (110), for receiving level signal, power input module (110) exports the adjustment signal of corresponding duty cycle according to input level signal, and the voltage signal of stable output power input module (110) is adjusted by adjustment signal.

Description

Technical Field

[0001] This utility model relates to the field of switching power supply technology, and more specifically, to an ultra-high efficiency power supply circuit. Background Technology

[0002] Constant current / constant voltage output is a commonly used switching power supply circuit in fields such as battery charging and LED lighting drivers. In related technologies, AC-DC converters often employ relatively simple control strategies, resulting in poor stability of the output current when the load changes. Furthermore, current power conversion technologies are increasingly showing limitations, such as large size and high temperature rise, leading to low overall efficiency, high heat generation, and poor current thermal stability.

[0003] Therefore, how to improve the stability of the current and increase the efficiency of the product has become a technical problem that urgently needs to be solved by those skilled in the art. Utility Model Content

[0004] The technical problem to be solved by this utility model is that the power conversion technology of the existing power circuits has gradually shown limitations, such as large size and high product temperature rise, resulting in low overall product efficiency, large heat generation and poor current thermal stability. The present invention provides an ultra-high efficiency power circuit with better current stability.

[0005] The technical solution adopted by this utility model to solve its technical problem is: to construct an ultra-high efficiency power supply circuit, which has the following features:

[0006] A power input module, configured within the power circuit, is used to receive the current signal input from the front-end side and to rectify / filter / step down the input current signal to output a voltage signal.

[0007] The secondary rectifier module has its input terminal connected to the output terminal of the power input module. It is used to receive the stepped-down voltage signal and perform rectification / filtering on the voltage signal to output a low-voltage signal.

[0008] The secondary constant current and constant voltage module has its input terminal connected to one output terminal of the secondary rectifier module. It receives the low-voltage signal, compares the low-voltage signal with a reference voltage, and outputs a level signal.

[0009] The output terminal of the secondary constant current and constant voltage module is connected to the signal input terminal of the power input module to receive the level signal. The power input module outputs a stable voltage signal based on the corresponding duty cycle of the input level signal.

[0010] In some embodiments, the power input module includes a first rectifier filter circuit and an adjustment circuit.

[0011] The input terminal of the first rectifier and filter circuit is used to receive the current signal input from the front-end side.

[0012] The output terminal of the first rectifier and filter circuit is connected to the input terminal of the secondary rectifier module and an input terminal of the adjustment circuit, respectively.

[0013] The other input terminal of the regulating circuit is coupled to the output terminal of the secondary constant current and constant voltage module.

[0014] In some embodiments, the regulating circuit includes at least a quasi-resonant flyback controller.

[0015] One input terminal of the quasi-resonant flyback controller is connected to the output terminal of the first rectifier filter circuit.

[0016] The other input terminal of the quasi-resonant flyback controller is connected to the output terminal of the secondary constant current and constant voltage module.

[0017] In some embodiments, the secondary constant current and constant voltage module includes a reference circuit, a comparator circuit, and a voltage regulator circuit.

[0018] One end of the reference circuit is connected to the 5V voltage terminal.

[0019] One signal input terminal of the comparator circuit is connected to one output terminal of the secondary constant current and constant voltage module, for receiving the low-voltage signal.

[0020] The other signal input terminal of the comparator circuit is connected to the other end of the reference circuit, providing a reference voltage for the comparator circuit.

[0021] One end of the voltage regulator circuit is connected to the output of the comparator circuit, and is used to receive the level signal output by the comparator circuit after comparing the low voltage signal with the reference voltage.

[0022] The other end of the voltage regulator circuit is connected to the other input of the quasi-resonant flyback controller, and the voltage level signal is input to the quasi-resonant flyback controller.

[0023] In some embodiments, the comparison circuit includes at least a comparator.

[0024] The non-inverting input of the comparator is connected to one output of the secondary constant current and constant voltage module via a fifth resistor.

[0025] The inverting input of the comparator is connected to the other end of the reference circuit.

[0026] The output of the comparator is connected to one end of the voltage regulator circuit.

[0027] In some embodiments, the voltage regulator circuit includes at least a Zener diode, a fifth diode, and an optocoupler.

[0028] The cathode of the Zener diode is connected to the output terminal of the secondary constant current and constant voltage module.

[0029] The anode of the Zener diode is connected to the anode of the fifth diode.

[0030] The input terminal of the optocoupler is connected to the cathode of the fifth diode and the output terminal of the comparator, respectively.

[0031] The output of the optocoupler is coupled to the other input of the quasi-resonant flyback controller.

[0032] In some embodiments, the secondary rectifier module includes a second rectifier filter circuit and a current detection circuit.

[0033] The input terminal of the second rectifier and filter circuit is connected to one end of the secondary winding of the transformer.

[0034] One end of the primary winding of the transformer is connected to the output terminal of the first rectifier and filter circuit.

[0035] The input terminal of the current detection circuit is connected to the output terminal of the second rectifier and filter circuit.

[0036] One output terminal of the current detection circuit is connected to the non-inverting input terminal of the comparator.

[0037] The other output terminal of the current detection circuit is connected to one end of the load.

[0038] In some embodiments, the current detection circuit includes at least a linear current detector.

[0039] The power input terminal of the linear current detector is connected to the output terminal of the second rectifier and filter circuit.

[0040] One output terminal of the linear current detector is connected to the non-inverting input terminal of the comparator.

[0041] The other output terminal of the linear current detector is connected to one end of the load.

[0042] The ultra-high efficiency power supply circuit of this invention includes a power input module for receiving the current signal input from the front-end and rectifying / filtering / stepping the input current signal to output a voltage signal, a secondary rectifier module, and a secondary constant current and constant voltage module. The output terminal of the secondary constant current and constant voltage module is connected to the signal input terminal of the power input module to receive the level signal. The power input module outputs a corresponding duty cycle adjustment signal based on the input level signal, thereby adjusting the output voltage signal to a stable voltage signal. Compared with existing technologies, the power input module can output a corresponding duty cycle adjustment signal based on the level signal status fed back from the secondary constant current and constant voltage module. This adjustment signal controls / adjusts the voltage output by the power input module, improving output voltage / current stability and overall efficiency. This effectively solves the problems of low overall efficiency, high heat generation, and poor current thermal stability caused by the limitations of power conversion technology, such as large size and high product temperature rise. Attached Figure Description

[0043] The present invention will be further described below with reference to the accompanying drawings and embodiments. In the accompanying drawings:

[0044] Figure 1 This is a circuit diagram of an embodiment of the ultra-high efficiency power supply circuit provided by this utility model. Detailed Implementation

[0045] To provide a clearer understanding of the technical features, objectives, and effects of this utility model, the specific embodiments of this utility model will now be described in detail with reference to the accompanying drawings.

[0046] like Figure 1 As shown, in the first embodiment of the ultra-high efficiency power supply circuit of this utility model, the ultra-high efficiency power supply circuit 10 includes a power input module 110, a secondary rectification module 120, and a secondary constant current and constant voltage module 130.

[0047] The power input module 110 is used to receive voltage / current signals from the pre-amplifier circuit or the mains power supply, and to rectify / filter / step down the input voltage / current signals to output a voltage signal.

[0048] The secondary rectifier module 120 is used to receive the voltage signal output after rectification / filtering / step-down processing by the power input module 110, and to perform rectification / filtering processing on the voltage signal to output a low voltage signal (such as 20V).

[0049] The secondary constant current and constant voltage module 130 is equipped with a reference voltage, which has the functions of signal comparison and output level signal;

[0050] Specifically, the power input module 110 is configured in the power circuit to receive the voltage / current signal input from the front-end side, and to rectify / filter / step down the input voltage / current signal to output a voltage signal.

[0051] Furthermore, the input terminal of the secondary rectifier module 120 is connected to the output terminal of the power input module 110 to receive the stepped-down voltage signal and perform rectification / filtering on the voltage signal to output a low-voltage signal (such as 20V).

[0052] The input terminal of the secondary constant current and constant voltage module 130 is connected to an output terminal of the secondary rectifier module 120. It is used to receive a low voltage signal (such as 20V), compare the low voltage signal (such as 20V) with a reference voltage, and output a level signal (high level or low level signal) according to the comparison result.

[0053] The output terminal of the secondary constant current and constant voltage module 130 is connected to the signal input terminal of the power input module 110 to receive level signals. The power input module 110 can output a corresponding duty cycle adjustment signal according to the level state of the input level signal, and control or adjust the output of a stable voltage signal of the power input module 110 through the adjustment signal.

[0054] Using this technical solution, the power input module 110 can output a corresponding duty cycle adjustment signal based on the level signal status fed back by the secondary constant current and constant voltage module 130. This adjustment signal controls / adjusts the output voltage of the power input module 110 to improve the stability of the output voltage / current and thus enhance the overall efficiency. This effectively solves the problems caused by the limitations of power conversion technology, such as large size and high product temperature rise, resulting in low overall product efficiency, high heat generation, and poor current thermal stability.

[0055] In some implementations, such as Figure 1 As shown, to ensure the reliability of circuit operation, a first rectifier and filter circuit 111 and an adjustment circuit 112 can be set in the power input module 110.

[0056] The first rectifier and filter circuit 111 has the function of rectification and filtering.

[0057] The regulating circuit 112 has the function of adjusting the output voltage of the first rectifier and filter circuit 111;

[0058] Specifically, the input terminal of the first rectifier and filter circuit 111 is used to receive the voltage / current signal input from the front-end side, and to perform rectification, filtering, and transformation processing on the input voltage / current signal before outputting it to the secondary rectifier module 120.

[0059] The output terminal of the first rectifier and filter circuit 111 is connected to the input terminal of the secondary rectifier module 120 and an input terminal of the adjustment circuit 112, respectively.

[0060] The other input terminal of the adjustment circuit 112 is coupled to the output terminal of the secondary constant current and constant voltage module 130. It is used to receive the level signal fed back by the secondary constant current and constant voltage module 130 and change the duty cycle of the adjustment signal according to the level state of the level signal to control or adjust the voltage output by the first rectifier and filter circuit 111, so that the first rectifier and filter circuit 111 can output a stable voltage.

[0061] In some implementations, to ensure the reliability of the duty cycle adjustment of the adjustment signal, a quasi-resonant flyback controller U3 can be provided in the adjustment circuit 112, which is suitable for products that require high conversion efficiency and high power density.

[0062] Specifically, one input terminal (corresponding to pin 8) of the quasi-resonant flyback controller U3 is connected to the output terminal of the first rectifier and filter circuit 111 to receive voltage signals.

[0063] One input terminal (corresponding to pins 5 and 6) of the quasi-resonant flyback controller U3 is connected to the output terminal of the first rectifier and filter circuit 111.

[0064] Specifically, one input terminal (corresponding to pins 5 and 6) of the quasi-resonant flyback controller U3 is connected to one end of the primary winding of transformer T1A, and the other end of the primary winding of transformer T1A is connected to the output terminal of the first rectifier and filter circuit 111. This connection is used to control the current flowing through the primary winding of transformer T1A.

[0065] The other input terminal of the quasi-resonant flyback controller U3 is connected to the output terminal of the secondary constant current and constant voltage module 130.

[0066] When one input terminal (corresponding to pins 5 and 6) of the quasi-resonant flyback controller U3 is turned on, the current signal output by the first rectifier filter circuit 111 flows to the common terminal through the primary winding of the transformer T1A, so that it couples the output voltage to the secondary winding to output a voltage signal to the secondary constant current and constant voltage module 130.

[0067] In some embodiments, the secondary constant current and constant voltage module 130 includes a reference circuit 131, a comparator circuit 132, and a voltage regulator circuit 133.

[0068] The reference circuit 131 is used to provide a reference voltage for the comparator circuit 132.

[0069] Comparator circuit 132 functions to compare signals and output level signals.

[0070] The voltage regulator circuit 133 has the function of voltage regulation;

[0071] Specifically, one end of the reference circuit 131 is connected to the 5V voltage terminal.

[0072] One signal input terminal of the comparator circuit 132 is connected to one output terminal of the secondary constant current and constant voltage module 130, for receiving low-voltage signals.

[0073] The other signal input terminal of the comparator circuit 132 is connected to the other end of the reference circuit 131, providing a reference voltage for the comparator circuit 132.

[0074] One end of the voltage regulator circuit 133 is connected to the output of the comparator circuit 132, and is used to receive the level signal output by the comparator circuit 132 after comparing the low voltage signal with the reference voltage.

[0075] The other end of the voltage regulator circuit 133 is connected to the other input terminal (corresponding to pin 2) of the quasi-resonant flyback controller U3 through the seventeenth resistor R17, and inputs the level signal to the quasi-resonant flyback controller U3.

[0076] In some embodiments, the comparator circuit 132 includes at least a comparator U2, which performs signal comparison.

[0077] Specifically, the non-inverting input terminal (corresponding to pin 3) of comparator U2 is connected to an output terminal of the secondary constant current and constant voltage module 130 through the fifth resistor R5.

[0078] The inverting input terminal (corresponding to pin 4) of comparator U2 is connected to the other end of reference circuit 131 through resistor R25 (the 25th resistor).

[0079] The output of comparator U2 (corresponding to pin 1) is connected to one end of voltage regulator circuit 133 through the sixth diode D6 and the twenty-fourth resistor R24 ​​connected in series.

[0080] In some embodiments, the voltage regulator circuit 133 includes at least a Zener diode ZD1, a fifth diode D5, and an optocoupler PC1B.

[0081] The cathode of the Zener diode ZD1 is connected to the output terminal of the secondary constant current and constant voltage module 130.

[0082] The anode of Zener diode ZD1 is connected to the anode of the fifth diode D5.

[0083] The input terminal (corresponding to terminal A) of optocoupler PC1B is connected to the cathode of the fifth diode D5 and the output terminal (corresponding to pin 1) of comparator U2, respectively.

[0084] The output of optocoupler PC1B is coupled to the other input of quasi-resonant flyback controller U3 (corresponding to pin 2).

[0085] When the voltage at pin 3 of comparator U2 is greater than the voltage at pin 4 of comparator U2, the output level signal at pin 1 of comparator U2 is input to optocoupler PC1B through the sixth diode D6, the twenty-fourth resistor R24, and the twenty-first resistor R21. When current flows through optocoupler PC1B, optocoupler PC1A is fed back to pin 2 of quasi-resonant flyback controller U3 through the seventeenth resistor R17 and the tenth capacitor C10. Quasi-resonant flyback controller U3 performs corresponding calculations and adjusts the duty cycle of the adjustment signal according to the level signal input from optocoupler PC1A to adjust / control the stable voltage and current output of the first rectifier filter circuit 111.

[0086] In some embodiments, the secondary rectifier module 120 includes a second rectifier filter circuit 121 and a current detection circuit 122.

[0087] The second rectifier-filter circuit 121 has the function of rectification and filtering.

[0088] The current detection circuit 122 has the functions of current detection, amplification, and comparison.

[0089] Specifically, the input terminal of the second rectifier and filter circuit 121 is connected to one end of the secondary winding of transformer T1A, and is used to receive the voltage signal coupled out by transformer T1A.

[0090] One end of the primary winding of transformer T1A is connected to the output terminal of the first rectifier and filter circuit 111.

[0091] The input terminal of the current detection circuit 122 is connected to the output terminal of the second rectifier and filter circuit 121.

[0092] One output terminal of the current detection circuit 122 is connected to the non-inverting input terminal (corresponding to pin 3) of the comparator U2.

[0093] The other output terminal of the current detection circuit 122 is connected to one end of the load.

[0094] In some embodiments, the current detection circuit 122 includes at least a linear current detector U1.

[0095] The power input terminals (pins 1 and 2) of the linear current detector U1 are connected to the output terminal of the second rectifier and filter circuit 121.

[0096] The output terminal (corresponding to pin 4) of the linear current detector U1 is connected to the non-inverting input terminal (corresponding to pin 3) of the comparator U2 through the fifth resistor R5.

[0097] The other output terminal of the linear current detector U1 (corresponding to pins 3 and 4) is connected to one end of the load.

[0098] Specifically, the optocoupler PC1A forms a negative feedback circuit through the seventeenth resistor R17.

[0099] The twenty-third resistor, R23, is a current-limiting resistor, providing sampling overcurrent protection.

[0100] When pins 1 and 2 of the linear current detector U1 and pins 3 and 4 of the linear current detector U1 are connected, the linear current detector U1 performs a series of operations such as internal sampling, amplification and comparison, and outputs an analog signal voltage through pin 4 of the linear current detector U1. This signal voltage is then input to the non-inverting input terminal (corresponding to pin 3) of the comparator U2 through the fifth capacitor C5 and the fifth resistor R5 for comparison.

[0101] Zener diode ZD1 is a 22V Zener diode, therefore the maximum no-load output voltage is 22V.

[0102] The comparator U2, the sixth capacitor C6, the twelfth capacitor C12, the twenty-sixth resistor R26, the sixth diode D6, the twenty-fourth resistor R24, the twenty-first resistor R21, and the optocoupler PC1B constitute a constant current output circuit.

[0103] Pin 4 of the comparator is the current reference pin. It consists of V+, the twelfth resistor R12, the fourteenth resistor R14, the three-terminal Zener diode U4, and the nineteenth resistor R19, which together form a 5V reference voltage to supply pin 8 of the linear current detector U1.

[0104] After the network voltage "5V" is divided by the fifteenth resistor R15 and the eighteenth resistor R18: 5V * eighteenth resistor R18 / (fifteenth resistor R15 + eighteenth resistor R18) = 5 * 1 / (5.11 + 1) = 0.818V;

[0105] Since the linear current detector U1 outputs 100mV per 1A of current, the maximum output current is 0.818V / 100mV = 8.18A. When the voltage at pin 3 of comparator U2 is greater than the voltage at pin 4, the output level at pin 1 of comparator U2 is sent to optocoupler PC1B through the sixth diode D6, the twenty-fourth resistor R24, and the twenty-first resistor R21. When there is current (or level signal) flowing through optocoupler PC1B, optocoupler PC1A is fed back to pin 2 of quasi-resonant flyback controller U3 through the seventeenth resistor R17 and the tenth capacitor C10. Quasi-resonant flyback controller U3 performs corresponding calculations and adjusts / changes the duty cycle of the adjustment signal according to the level state (high level / low level) of the input level signal of optocoupler PC1A, so as to control or adjust the output voltage of the first rectifier filter circuit 111, so that the first rectifier filter circuit 111 can output a stable voltage.

[0106] Therefore, the secondary rectifier module 120 and the secondary constant current and constant voltage module 130 are combined to achieve stable current output. This solution can improve efficiency to 94%, and the product is small in size and has low heat generation, which not only reduces costs but also provides good thermal stability.

[0107] The embodiments of the present invention have been described above with reference to the accompanying drawings. However, the present invention is not limited to the specific embodiments described above. The specific embodiments described above are merely illustrative and not restrictive. Those skilled in the art can make many other forms under the guidance of the present invention without departing from the spirit and scope of the claims. All of these forms are within the protection scope of the present invention.

Claims

1. A high-efficiency power supply circuit, characterized in that, have: A power input module, configured within the power circuit, is used to receive the current signal input from the front-end side and to rectify / filter / step down the input current signal to output a voltage signal. The secondary rectifier module has its input terminal connected to the output terminal of the power input module. It is used to receive the stepped-down voltage signal and perform rectification / filtering on the voltage signal to output a low-voltage signal. The secondary constant current and constant voltage module has its input terminal connected to one output terminal of the secondary rectifier module. It receives the low-voltage signal, compares the low-voltage signal with a reference voltage, and outputs a level signal. The output terminal of the secondary constant current and constant voltage module is connected to the signal input terminal of the power input module to receive the level signal. The power input module outputs a corresponding duty cycle adjustment signal according to the input level signal, and adjusts the output of the power input module to a stable voltage signal through the adjustment signal.

2. The ultra-high efficiency power supply circuit according to claim 1, characterized in that, The power input module includes a first rectifier and filter circuit and an adjustment circuit. The input terminal of the first rectifier and filter circuit is used to receive the current signal input from the front-end side. The output terminal of the first rectifier and filter circuit is connected to the input terminal of the secondary rectifier module and an input terminal of the adjustment circuit, respectively. The other input terminal of the regulating circuit is coupled to the output terminal of the secondary constant current and constant voltage module.

3. The ultra-high efficiency power supply circuit according to claim 2, characterized in that, The regulating circuit includes at least a quasi-resonant flyback controller. One input terminal of the quasi-resonant flyback controller is connected to the output terminal of the first rectifier filter circuit. The other input terminal of the quasi-resonant flyback controller is connected to the output terminal of the secondary constant current and constant voltage module.

4. The ultra-high efficiency power supply circuit according to claim 3, characterized in that, The secondary constant current and constant voltage module includes a reference circuit, a comparator circuit, and a voltage regulator circuit. One end of the reference circuit is connected to the 5V voltage terminal. One signal input terminal of the comparator circuit is connected to one output terminal of the secondary constant current and constant voltage module, for receiving the low-voltage signal. The other signal input terminal of the comparator circuit is connected to the other end of the reference circuit, providing a reference voltage for the comparator circuit. One end of the voltage regulator circuit is connected to the output of the comparator circuit, and is used to receive the level signal output by the comparator circuit after comparing the low voltage signal with the reference voltage. The other end of the voltage regulator circuit is connected to the other input of the quasi-resonant flyback controller, and the voltage level signal is input to the quasi-resonant flyback controller.

5. The ultra-high efficiency power supply circuit according to claim 4, characterized in that, The comparison circuit includes at least a comparator. The non-inverting input of the comparator is connected to one output of the secondary constant current and constant voltage module via a fifth resistor. The inverting input of the comparator is connected to the other end of the reference circuit. The output of the comparator is connected to one end of the voltage regulator circuit.

6. The ultra-high efficiency power supply circuit according to claim 5, characterized in that, The voltage regulator circuit includes at least a Zener diode, a fifth diode, and an optocoupler. The cathode of the Zener diode is connected to the output terminal of the secondary constant current and constant voltage module. The anode of the Zener diode is connected to the anode of the fifth diode. The input terminal of the optocoupler is connected to the cathode of the fifth diode and the output terminal of the comparator, respectively. The output of the optocoupler is coupled to the other input of the quasi-resonant flyback controller.

7. The ultra-high efficiency power supply circuit according to claim 6, characterized in that, The secondary rectifier module includes a second rectifier filter circuit and a current detection circuit. The input terminal of the second rectifier and filter circuit is connected to one end of the secondary winding of the transformer. One end of the primary winding of the transformer is connected to the output terminal of the first rectifier and filter circuit. The input terminal of the current detection circuit is connected to the output terminal of the second rectifier and filter circuit. One output terminal of the current detection circuit is connected to the non-inverting input terminal of the comparator. The other output terminal of the current detection circuit is connected to one end of the load.

8. The ultra-high efficiency power supply circuit according to claim 7, characterized in that, The current detection circuit includes at least a linear current detector. The power input terminal of the linear current detector is connected to the output terminal of the second rectifier and filter circuit. One output terminal of the linear current detector is connected to the non-inverting input terminal of the comparator. The other output terminal of the linear current detector is connected to one end of the load.

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