A stable high-efficiency switching power supply circuit

Abstract

The utility model discloses a kind of stable voltage high-efficiency switching power supply circuit, it is related to switching power supply technical field, including drive module, drive first conversion module to the direct current electric energy of power module access carries out high-frequency isolation voltage transformation and rectification filtering processing, provides stable voltage for output module, by protection control module when detecting that first conversion module appears over temperature, will control second conversion module instead of first conversion module and carry out high-frequency isolation voltage transformation and rectification filtering processing, when required stable voltage is greater than the maximum stable voltage that first conversion module can provide, output detection module will control second conversion module and carry out secondary isolation voltage transformation processing to the electric energy that first conversion module isolation voltage transformation output, again rectification filtering processing is carried out.The utility model stable voltage high-efficiency switching power supply circuit can maintain stable voltage output, and avoid first conversion module damage, can also improve output stable voltage value, improve output voltage range.

Description

Technical Field

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

[0002] With the rapid development of power electronics technology, power electronic equipment is becoming increasingly closely related to people's work and life. Power electronic equipment cannot function without a reliable power supply. The power supply is a device that provides energy to electronic equipment and can provide the electrical energy required by electronic components. In the existing technology, high-efficiency switching power supply circuits generally use high-frequency transformers for high-frequency voltage transformation. However, when the high-frequency transformer experiences faults such as abnormal temperature, the switching power supply will stop supplying power and cannot continue to maintain the power supply state. Furthermore, the voltage transformation capacity of the high-frequency transformer is limited, and it is impossible to further increase the output voltage range of the switching power supply circuit. Therefore, improvements are needed. Utility Model Content

[0003] This invention provides a regulated and efficient switching power supply circuit to solve the problems mentioned in the background art.

[0004] To achieve the above objectives, this utility model provides the following technical solution:

[0005] A regulated high-efficiency switching power supply circuit includes: a power supply module, a drive module, a first conversion module, a protection and control module, an output detection module, a second conversion module, and an output module;

[0006] The power module is used to connect to DC power.

[0007] The drive module, connected to the power supply module, output module, first conversion module and second conversion module, is used to sample the voltage of the electrical energy input to the output module and adjust the voltage value of the DC electrical energy input to the first conversion module or the second conversion module according to the sampled signal, and control the first conversion module or the second conversion module to perform high-frequency isolation transformer operation.

[0008] The first conversion module is connected to the power supply module and is used to receive DC power, perform high-frequency isolation transformation on the DC power and output the first power, and perform rectification and filtering on the first power and output the second power.

[0009] The protection control module is connected to the first conversion module and the second conversion module. It is used to detect over-temperature of the first conversion module and, when the temperature is over-temperature, control the first conversion module to stop receiving DC power and control the second conversion module to receive DC power.

[0010] The output detection module is connected to the second conversion module and the first conversion module. It is used to set the output voltage threshold and, when the output voltage threshold is greater than the maximum voltage value of the second electrical energy, control the second conversion module to perform isolation transformation processing on the first electrical energy and control the first conversion module to stop rectification and filtering.

[0011] The second conversion module is connected to the power supply module and the first conversion module. It is used to receive DC power, perform high-frequency isolation transformation on the DC power and output the third power, perform rectification and filtering on the third power and output the fourth power, perform isolation transformation on the input first power and rectify and filter the processed power and output the fifth power.

[0012] The output module, connected to the first and second conversion modules, is used to receive the second, fourth, or fifth electrical energy.

[0013] As a further embodiment of this utility model: the power supply module includes a power interface and a first capacitor; the drive module includes a first driver, a first power transistor and a feedback device; the protection control module includes an over-temperature detection device;

[0014] Preferably, the first end of the power interface is connected to the VCC end of the first driver and is connected to the GND end of the first driver, the source of the first power transistor, the second end of the power interface, and the ground end through the first capacitor. The OUT end of the first driver is connected to the gate of the first power transistor, and the FB end of the first power transistor is connected to the output end of the feedback device.

[0015] As a further embodiment of this utility model: the first conversion module includes a first transformer, a first thyristor, a first resistor, a first switching transistor, a second resistor, a sixth thyristor, a first diode, a second switching transistor, and a second capacitor; the output module includes an output port;

[0016] Preferably, the second end of the primary side of the first transformer is connected to one end of the first thyristor, the other end of the first thyristor is connected to the drain of the first power transistor, the control end of the first thyristor is connected to the collector of the first switching transistor and connected to the first end of the power interface, one end of the second resistor and the first end of the primary side of the first transformer through the first resistor, the first end of the secondary side of the first transformer is connected to the anode of the sixth thyristor, the cathode of the sixth thyristor is connected to the collector of the second switching transistor and the other end of the second resistor, the base of the second switching transistor is connected to the output detection module, and the cathode of the sixth thyristor is connected to the cathode of the first diode, the input end of the feedback device and the first end of the output port and connected to the second end of the output port, the second end of the secondary side of the first transformer and the ground through the second capacitor.

[0017] As a further embodiment of this utility model: the second conversion module includes a second transformer, a second thyristor, a third thyristor, a seventh thyristor, and a third diode;

[0018] Preferably, the first end of the primary side of the second transformer is connected to one end of the third thyristor, the other end of the third thyristor is connected to the first end of the power interface, the second end of the primary side of the second transformer is connected to one end of the second thyristor, the other end of the second thyristor is connected to the drain of the first power transistor, the control terminal of the third thyristor is connected to the control terminal of the second thyristor, the anode of the third diode and the over-temperature detection device, the first end of the secondary side of the second transformer is connected to the anode of the seventh thyristor, the cathode of the seventh thyristor is connected to the cathode of the second diode and the first end of the output port, the second end of the secondary side of the second transformer is connected to the anode of the second diode and the second end of the output port, and the cathode of the seventh thyristor is connected to the cathode of the third diode.

[0019] As a further improvement of this utility model, the second conversion module also includes a fourth thyristor, a fifth thyristor, and a fourth diode;

[0020] Preferably, one end of the fourth thyristor and one end of the fifth thyristor are respectively connected to the first and second ends of the secondary side of the first transformer, the other ends of the fourth thyristor and the fifth thyristor are respectively connected to the first and second ends of the primary side of the second transformer, the control terminal of the fifth thyristor is connected to the control terminal of the fourth thyristor, the anode of the fourth diode and the output detection module, and the cathode of the fourth diode is connected to the control terminal of the seventh thyristor.

[0021] As a further improvement of this utility model: the output detection module includes a first reference power supply, a second reference power supply, a first comparator, and a third resistor;

[0022] Preferably, the non-inverting and inverting inputs of the first comparator are connected to the first reference power supply and the second reference power supply, respectively, and the output of the first comparator is connected to the control terminal of the fourth thyristor, the control terminal of the fifth thyristor, the anode of the fourth diode, and the base of the second switching transistor through the third resistor.

[0023] Compared with the prior art, the beneficial effects of this utility model are as follows: The voltage-stabilized high-efficiency switching power supply circuit of this utility model can drive the first conversion module to perform high-frequency isolation transformation and rectification filtering on the DC power input to the power module, providing voltage regulation for the output module. When the protection control module detects that the first conversion module has overheated, it will control the second conversion module to replace the first conversion module to perform high-frequency isolation transformation and rectification filtering to maintain the voltage regulation output and prevent damage to the first conversion module. When the required voltage regulation is greater than the maximum voltage regulation that the first conversion module can provide, the output detection module will control the second conversion module to perform secondary isolation transformation on the power output from the isolation transformation of the first conversion module, and then perform rectification and filtering to improve the output voltage regulation value and increase the output voltage range. Attached Figure Description

[0024] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the description of the embodiments of this utility model will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0025] Figure 1 This is a schematic block diagram of a regulated and efficient switching power supply circuit provided for this utility model embodiment.

[0026] Figure 2 A circuit diagram of a regulated and efficient switching power supply circuit provided for this utility model embodiment.

[0027] Figure 3 The connection circuit diagram of the output detection module provided for this utility model embodiment. Detailed Implementation

[0028] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0029] In one embodiment, see Figure 1 A regulated and high-efficiency switching power supply circuit includes: a power supply module 1, a drive module 2, a first conversion module 3, a protection and control module 4, an output detection module 5, a second conversion module 6, and an output module 7.

[0030] Specifically, power module 1 is used to connect to DC power;

[0031] The drive module 2 is connected to the power supply module 1, the output module 7, the first transformation module, and the second conversion module 6. It is used to sample the voltage of the electrical energy input to the output module 7 and adjust the voltage value of the DC electrical energy input to the first conversion module 3 or the second conversion module 6 according to the sampled signal, and control the first conversion module 3 or the second conversion module 6 to perform high-frequency isolation transformer operation.

[0032] The first conversion module 3 is connected to the power supply module 1 and is used to receive DC power, perform high-frequency isolation transformation on the DC power and output the first power, and perform rectification and filtering on the first power and output the second power.

[0033] The protection control module 4 is connected to the first conversion module 3 and the second conversion module 6. It is used to detect over-temperature of the first conversion module 3 and, when over-temperature occurs, control the first conversion module 3 to stop receiving DC power and control the second conversion module 6 to receive DC power.

[0034] The output detection module 5 is connected to the second conversion module 6 and the first conversion module 3. It is used to set the output voltage threshold and, when the output voltage threshold is greater than the maximum voltage value of the second electrical energy, control the second conversion module 6 to perform isolation transformation processing on the first electrical energy and control the first conversion module 3 to stop rectification and filtering.

[0035] The second conversion module 6 is connected to the power supply module 1 and the first conversion module 3. It is used to receive DC power, perform high-frequency isolation transformation on the DC power and output the third power, perform rectification and filtering on the third power and output the fourth power, perform isolation transformation on the input first power and rectify and filter the processed power and output the fifth power.

[0036] Output module 7, connected to first conversion module 3 and second conversion module 6, is used to receive second electrical energy, fourth electrical energy or fifth electrical energy.

[0037] In a specific embodiment, the power module 1 can be a power circuit composed of a power interface and a capacitor, capable of receiving DC power; the drive module 2 can be a drive circuit composed of a drive controller, a field-effect transistor, and a feedback device, capable of sampling the voltage of the output module 7 and controlling the voltage regulation of the first conversion module 3 and the second conversion module 6; the first conversion module 3 can be a first conversion circuit composed of a transformer, a thyristor, a diode, a transistor, etc., capable of controlling the transmission state of DC power and performing high-frequency isolation transformation and rectification filtering on the input DC power; the protection control module 4 can be a protection control circuit composed of an over-temperature detection device, capable of detecting over-temperature in the first conversion module 3 and controlling the circuit when over-temperature occurs. The second conversion module 6 replaces the first conversion module 3 to perform high-frequency isolation transformation and rectification filtering. The output detection module 5 can be an output detection circuit composed of a reference power supply, a comparator, and a resistor. It can set an output voltage threshold, which is the required regulated voltage value, and compare it with the maximum voltage value output by the first conversion module 3. The second conversion module 6 can be a second conversion circuit composed of a thyristor, a transformer, and a diode. It can replace the first conversion module 3 to perform high-frequency isolation transformation and rectification filtering, or perform further transformation processing on the electrical energy output by the isolation transformer of the first conversion module 3. The output module 7 can be an output circuit composed of output ports, which can transmit the received electrical energy to the connected load.

[0038] In another embodiment, please refer to Figure 1 , Figure 2 and Figure 3 The power module 1 includes a power interface and a first capacitor C1; the drive module 2 includes a first driver IC1, a first power transistor Q1 and a feedback device; the protection control module 4 includes an over-temperature detection device.

[0039] Specifically, the first end of the power interface is connected to the VCC end of the first driver IC1 and is connected to the GND end of the first driver IC1, the source of the first power transistor Q1, the second end of the power interface, and the ground end through the first capacitor C1. The OUT end of the first driver IC1 is connected to the gate of the first power transistor Q1, and the FB end of the first power transistor Q1 is connected to the output end of the feedback device.

[0040] In a specific embodiment, the first driver IC1 can be a UC3876 chip; the first power transistor Q1 can be an N-channel MOSFET; the feedback device can be a feedback circuit composed of an optocoupler, a TL431, a resistor, and a capacitor to detect the voltage of the output module 7 and provide a feedback signal to the first driver IC1; the temperature detection device can be composed of a thermistor, a comparator, and a reference power supply to perform over-temperature detection.

[0041] Furthermore, the first conversion module 3 includes a first transformer B1, a first thyristor S1, a first resistor R1, a first switch V1, a second resistor R2, a sixth thyristor S6, a first diode D1, a second switch V2, and a second capacitor C2; the output module 7 includes an output port.

[0042] Specifically, the second end of the primary side of the first transformer B1 is connected to one end of the first thyristor S1, the other end of the first thyristor S1 is connected to the drain of the first power transistor Q1, the control end of the first thyristor S1 is connected to the collector of the first switching transistor V1 and is connected to the first end of the power interface, one end of the second resistor R2 and the first end of the primary side of the first transformer B1 through the first resistor R1, the first end of the secondary side of the first transformer B1 is connected to the anode of the sixth thyristor S6, the cathode of the sixth thyristor S6 is connected to the collector of the second switching transistor V2 and the other end of the second resistor R2, the base of the second switching transistor V2 is connected to the output detection module 5, and the cathode of the sixth thyristor S6 is connected to the cathode of the first diode D1, the input end of the feedback device and the first end of the output port and is connected to the second end of the output port, the second end of the secondary side of the first transformer B1 and the ground through the second capacitor C2.

[0043] In a specific embodiment, the first thyristor S1 can be a bidirectional thyristor; the sixth thyristor S6 can be a unidirectional thyristor; and the second switching transistor V2 can be an NPN transistor.

[0044] Furthermore, the second conversion module 6 includes a second transformer B2, a second thyristor S2, a third thyristor S3, a seventh thyristor S7, and a third diode D3;

[0045] Specifically, the first end of the primary side of the second transformer B2 is connected to one end of the third thyristor S3, and the other end of the third thyristor S3 is connected to the first end of the power interface. The second end of the primary side of the second transformer B2 is connected to one end of the second thyristor S2, and the other end of the second thyristor S2 is connected to the drain of the first power transistor Q1. The control terminal of the third thyristor S3 is connected to the control terminal of the second thyristor S2, the anode of the third diode D3, and the over-temperature detection device. The first end of the secondary side of the second transformer B2 is connected to the anode of the seventh thyristor S7. The cathode of the seventh thyristor S7 is connected to the cathode of the second diode and the first end of the output port. The second end of the secondary side of the second transformer B2 is connected to the anode of the second diode and the second end of the output port. The cathode of the seventh thyristor S7 is connected to the cathode of the third diode D3.

[0046] In a specific embodiment, the second thyristor S2 and the third thyristor S3 can both be bidirectional thyristors; the seventh thyristor S7 can be a unidirectional thyristor.

[0047] Furthermore, the second conversion module 6 also includes a fourth thyristor S4, a fifth thyristor S5, and a fourth diode D4;

[0048] Specifically, one end of the fourth thyristor S4 and one end of the fifth thyristor S5 are respectively connected to the first and second ends of the secondary side of the first transformer B1. The other ends of the fourth thyristor S4 and the fifth thyristor S5 are respectively connected to the first and second ends of the primary side of the second transformer B2. The control terminal of the fifth thyristor S5 is connected to the control terminal of the fourth thyristor S4, the anode of the fourth diode D4, and the output detection module 5. The cathode of the fourth diode D4 is connected to the control terminal of the seventh thyristor S7.

[0049] In a specific embodiment, both the fourth thyristor S4 and the fifth thyristor S5 can be selected as unidirectional thyristors.

[0050] Furthermore, the output detection module 5 includes a first reference power supply VREF1, a second reference power supply VREF2, a first comparator A1, and a third resistor R3;

[0051] Specifically, the non-inverting and inverting inputs of the first comparator A1 are connected to the first reference power supply VREF1 and the second reference power supply VREF2, respectively. The output of the first comparator A1 is connected to the control terminal of the fourth thyristor S4, the control terminal of the fifth thyristor S5, the anode of the fourth diode D4, and the base of the second switching transistor V2 through the third resistor R3.

[0052] In a specific embodiment, the first reference power supply VREF1 is set to the output voltage threshold; the second reference power supply VREF2 is the maximum voltage of the electrical energy output by the first conversion module 3 when it performs rectification and filtering; the first comparator A1 can be an LM358 comparator.

[0053] In this embodiment of a high-efficiency regulated switching power supply circuit, DC power is input through a power interface. A first capacitor C1 filters the power. A first resistor R1 triggers the first thyristor S1 to conduct, and a second resistor R2 triggers the sixth thyristor S6 to conduct. A first driver IC1 controls the first transformer B1 to perform high-frequency isolation transformer regulation by driving the conduction state of the first power transistor Q1. The power is then rectified and filtered by the sixth diode, the first diode D1, and the second capacitor C2 to supply power to the output port. A feedback device samples the voltage of the power input to the output port and provides a feedback signal to the first driver IC1, enabling the first driver IC1 to adjust the conduction level of the first power transistor Q1 to achieve voltage regulation control. An over-temperature detection device detects over-temperature in the first transformer B1 and provides a high-level signal when over-temperature occurs, triggering the first switching transistor V1, the third thyristor S3, the second thyristor S2, and the seventh thyristor S7 to conduct. When the thyristor S1 is turned off, the first transformer B1 stops working. The second transformer B2 replaces the first transformer B1 for high-frequency isolation transformation, and then the voltage is rectified by the seventh diode and the second diode to supply power to the output port. When the required output voltage, i.e., the output voltage threshold provided by the first reference power supply VREF1, is greater than the energy voltage provided by the second reference power supply VREF2, the energy voltage provided by the second reference power supply VREF2 is equal to the maximum voltage of the energy output by the first conversion module 3 during rectification and filtering. The first comparator A1 triggers the fourth thyristor S4, the fifth thyristor S5, the second switch V2, and the seventh thyristor S7 to conduct, and controls the sixth thyristor S6 to turn off. This causes the first transformer B1 to perform high-frequency isolation transformation, and then the voltage is transformed by the second transformer B2. Finally, the voltage is rectified and filtered by the seventh diode, the second diode, and the second capacitor C2, increasing the energy voltage input to the output port.

[0054] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0055] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A regulated high-efficiency switching power supply circuit, characterized in that, The regulated high-efficiency switching power supply circuit includes: a power supply module, a drive module, a first conversion module, a protection and control module, an output detection module, a second conversion module, and an output module; The power module is used to connect to DC power. The drive module, connected to the power supply module, output module, first conversion module and second conversion module, is used to sample the voltage of the electrical energy input to the output module and adjust the voltage value of the DC electrical energy input to the first conversion module or the second conversion module according to the sampled signal, and control the first conversion module or the second conversion module to perform high-frequency isolation transformer operation. The first conversion module is connected to the power supply module and is used to receive DC power, perform high-frequency isolation transformation on the DC power and output the first power, and perform rectification and filtering on the first power and output the second power. The protection control module is connected to the first conversion module and the second conversion module. It is used to detect over-temperature of the first conversion module and, when the temperature is over-temperature, control the first conversion module to stop receiving DC power and control the second conversion module to receive DC power. The output detection module is connected to the second conversion module and the first conversion module. It is used to set the output voltage threshold and, when the output voltage threshold is greater than the maximum voltage value of the second electrical energy, control the second conversion module to perform isolation transformation processing on the first electrical energy and control the first conversion module to stop rectification and filtering. The second conversion module is connected to the power supply module and the first conversion module. It is used to receive DC power, perform high-frequency isolation transformation on the DC power and output the third power, perform rectification and filtering on the third power and output the fourth power, perform isolation transformation on the input first power and rectify and filter the processed power and output the fifth power. The output module, connected to the first and second conversion modules, is used to receive the second, fourth, or fifth electrical energy.

2. The voltage-regulated high-efficiency switching power supply circuit according to claim 1, characterized in that, The power module includes a power interface and a first capacitor; the drive module includes a first driver, a first power transistor, and a feedback device; the protection and control module includes an over-temperature detection device. The first end of the power interface is connected to the VCC end of the first driver and is connected to the GND end of the first driver, the source of the first power transistor, the second end of the power interface, and the ground end through the first capacitor. The OUT end of the first driver is connected to the gate of the first power transistor, and the FB end of the first power transistor is connected to the output end of the feedback device.

3. The voltage-regulated high-efficiency switching power supply circuit according to claim 2, characterized in that, The first conversion module includes a first transformer, a first thyristor, a first resistor, a first switching transistor, a second resistor, a sixth thyristor, a first diode, a second switching transistor, and a second capacitor; the output module includes an output port. The second end of the primary side of the first transformer is connected to one end of the first thyristor, the other end of the first thyristor is connected to the drain of the first power transistor, the control end of the first thyristor is connected to the collector of the first switching transistor and is connected to the first end of the power interface, one end of the second resistor and the first end of the primary side of the first transformer through the first resistor, the first end of the secondary side of the first transformer is connected to the anode of the sixth thyristor, the cathode of the sixth thyristor is connected to the collector of the second switching transistor and the other end of the second resistor, the base of the second switching transistor is connected to the output detection module, the cathode of the sixth thyristor is connected to the cathode of the first diode, the input end of the feedback device and the first end of the output port and is connected to the second end of the output port, the second end of the secondary side of the first transformer and the ground through the second capacitor.

4. The voltage-regulated high-efficiency switching power supply circuit according to claim 3, characterized in that, The second conversion module includes a second transformer, a second thyristor, a third thyristor, a seventh thyristor, and a third diode; The first end of the primary side of the second transformer is connected to one end of the third thyristor, and the other end of the third thyristor is connected to the first end of the power interface. The second end of the primary side of the second transformer is connected to one end of the second thyristor, and the other end of the second thyristor is connected to the drain of the first power transistor. The control terminal of the third thyristor is connected to the control terminal of the second thyristor, the anode of the third diode, and the over-temperature detection device. The first end of the secondary side of the second transformer is connected to the anode of the seventh thyristor. The cathode of the seventh thyristor is connected to the cathode of the second diode and the first end of the output port. The second end of the secondary side of the second transformer is connected to the anode of the second diode and the second end of the output port. The cathode of the seventh thyristor is connected to the cathode of the third diode.

5. The voltage-regulated high-efficiency switching power supply circuit according to claim 4, characterized in that, The second conversion module also includes a fourth thyristor, a fifth thyristor, and a fourth diode; One end of the fourth thyristor and one end of the fifth thyristor are respectively connected to the first and second ends of the secondary side of the first transformer. The other ends of the fourth thyristor and the fifth thyristor are respectively connected to the first and second ends of the primary side of the second transformer. The control terminal of the fifth thyristor is connected to the control terminal of the fourth thyristor, the anode of the fourth diode, and the output detection module. The cathode of the fourth diode is connected to the control terminal of the seventh thyristor.

6. The voltage-regulated high-efficiency switching power supply circuit according to claim 5, characterized in that, The output detection module includes a first reference power supply, a second reference power supply, a first comparator, and a third resistor; The non-inverting and inverting inputs of the first comparator are connected to the first reference power supply and the second reference power supply, respectively. The output of the first comparator is connected to the control terminal of the fourth thyristor, the control terminal of the fifth thyristor, the anode of the fourth diode, and the base of the second switching transistor through the third resistor.

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