An isolated switching power supply circuit

Abstract

The utility model discloses an isolated switching power supply circuit relates to switching power supply technical field, including switching power supply module, the high frequency voltage regulation processing of direct current energy to power module access is handled by first output module and second output module and carries out output rectification filter processing and carries out multipath output power supply, and the connection state of first output module and second output module and load is detected by output detection module, and when first output module connects load and second output module is no load, control energy storage module stores the electric energy of second output module output, avoids the no load condition of switching power supply, and by electric quantity detection module full power detection is carried out to energy storage module and when energy storage module full power, switching power supply module power supply. The utility model discloses isolated switching power supply circuit can improve switching power supply's energy utilization and security, improve switching power supply's energy saving.

Description

Technical Field

[0001] This utility model relates to the field of switching power supply technology, specifically an isolated switching power supply circuit. Background Technology

[0002] An isolated switching power supply is a power supply device that achieves electrical isolation between input and output through a high-frequency transformer. In the prior art, to achieve multiple outputs, the high-frequency transformer uses multiple sets of secondary windings to control multiple outputs. However, when performing voltage regulation control, each output port of the high-frequency transformer needs to be connected to a load; otherwise, the high-frequency transformer may experience no-load conditions, which could lead to overheating. Therefore, improvements are needed. Utility Model Content

[0003] This utility model provides an isolated 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] An isolated switching power supply circuit includes: a power supply module, a switching power supply module, a first output module, a second output module, an output detection module, an energy storage module, and a power detection module.

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

[0007] A switching power supply module, connected to a power supply module and an energy storage module, is used to perform high-frequency voltage regulation on the input DC power or the third power output from the energy storage module and output the first power and the second power.

[0008] The first output module is connected to the switching power supply module and is used to rectify and filter the first electrical energy and supply power to the connected load.

[0009] The second output module is connected to the switching power supply module and is used to rectify and filter the second electrical energy and supply power to the connected load.

[0010] An output detection module, connected to the first output module and the second output module, is used to detect the connection status of the first output module and the second output module with the load, and outputs a first control signal when the first output module is connected to the load and the second output module is not connected to the load.

[0011] The energy storage module, connected to the output detection module and the second output module, is used to store the second electrical energy and release the third electrical energy when the first control signal is received, and to transmit the third electrical energy to the switching power supply module.

[0012] The power detection module, connected to the energy storage module, is used to detect the power of the third electrical energy and, when the detected signal is greater than the set full-charge threshold, control the energy storage module to transfer the third electrical energy to the switching power supply module.

[0013] As a further embodiment of this utility model: the power supply module includes a power interface, a first diode and a first capacitor; the switching power supply module includes a first resistor, a second resistor, a fourth capacitor, a first driver, a third resistor, a fourth resistor, a fifth diode, a second diode and a first transformer;

[0014] Preferably, the first end of the power interface is connected to the anode of the first diode, the cathode of the first diode is connected to one end of the first resistor, the VIN terminal of the first driver, the anode of the fifth diode and the first end of the primary side of the first transformer, and is connected to the second end of the power interface, one end of the second resistor, one end of the fourth capacitor, the GND terminal of the first driver and one end of the fourth resistor through the first capacitor, the other end of the fourth resistor is connected to the SENSE terminal of the first driver, the other end of the fourth capacitor is connected to the SS terminal of the first driver, the EN terminal of the first driver is connected to the other end of the second capacitor and the other end of the first resistor, the FB terminal of the first driver is connected to the SW terminal of the first driver, the anode of the second diode and the second end of the primary side of the first transformer through the other end of the third resistor, and the cathode of the fifth diode is connected to the cathode of the second diode.

[0015] As a further embodiment of this utility model: the first output module includes a third diode, a second capacitor, and a first port; the second output module includes a fourth diode, a third capacitor, and a second port;

[0016] Preferably, the anode of the third diode is connected to the first end of the first secondary side of the first transformer, the cathode of the third diode is connected to the first end of the first port and connected to the second end of the first secondary side of the first transformer through the second capacitor, the anode of the fourth diode is connected to the first end of the second secondary side of the first transformer, the cathode of the fourth diode is connected to the first end of the second port and connected to the first end of the second secondary side of the first transformer and ground through the third capacitor.

[0017] As a further embodiment of this utility model: the output detection module includes a fifth resistor, a first optocoupler, a first power supply, a seventh resistor, an eighth resistor, a second optocoupler, a sixth resistor, and a first logic chip;

[0018] Preferably, the first end of the first optocoupler is connected to the second end of the first port, the second end of the first optocoupler is connected to the second end of the first secondary side of the first transformer through a fifth resistor, the third end of the first optocoupler is connected to the first power supply and the A end of the first logic chip and is connected to the third end of the second optocoupler through a seventh resistor, the fourth end of the first optocoupler is connected to the B end of the first logic chip and is connected to the fourth end of the second optocoupler and the ground through an eighth resistor, the first end of the fourth optocoupler is connected to the second end of the second port, and the second end of the fourth optocoupler is connected to the second end of the second secondary side of the first transformer through a sixth resistor.

[0019] As a further embodiment of this utility model: the energy storage module includes an energy storage device, a first power transistor, a second power transistor, and a boost device;

[0020] Preferably, the first end of the energy storage device is connected to the source of the first power transistor and the drain of the second power transistor. The drain of the first power transistor is connected to the cathode of the fourth diode. The gate of the second power transistor is connected to the power detection module. The gate of the first power transistor is connected to the Y terminal of the first logic chip. The second end of the energy storage device is connected to the ground terminal and the ground terminal of the boost device. The input terminal of the boost device is connected to the source of the second power transistor. The output terminal of the boost device is connected to the VIN terminal of the first driver.

[0021] As a further improvement of this utility model: the power detection module includes a ninth resistor, a tenth resistor, and a full charge detection device;

[0022] Preferably, one end of the ninth resistor is connected to the first end of the energy storage device, the other end of the ninth resistor is connected to the input end of the full charge detection device and connected to the second end of the energy storage device through the tenth resistor, and the output end of the full charge detection device is connected to the gate of the second power transistor.

[0023] Compared with the prior art, the beneficial effects of this utility model are as follows: The isolated switching power supply circuit of this utility model uses a switching power supply module to perform high-frequency voltage transformation and regulation on the DC power input to the power supply module. The first output module and the second output module perform output rectification and filtering and provide multi-channel output power supply. The output detection module detects the connection status of the first output module and the second output module with the load. When the first output module is connected to the load and the second output module is unloaded, the energy storage module is controlled to store the electrical energy output by the second output module, avoiding the switching power supply from being unloaded, improving the energy utilization rate and safety of the switching power supply. The power detection module detects the full charge of the energy storage module and supplies power to the switching power supply module when the energy storage module is fully charged, improving the energy efficiency of the switching power supply. 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 an isolated switching power supply circuit provided for an example of this utility model.

[0026] Figure 2 A circuit diagram of an isolated switching power supply circuit provided for this utility model embodiment.

[0027] Figure 3 The connection circuit diagram of the power 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 An isolated switching power supply circuit includes: a power supply module 1, a switching power supply module 2, a first output module 3, a second output module 4, an output detection module 5, an energy storage module 6, and a power detection module 7.

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

[0031] The switching power supply module 2 is connected to the power supply module 1 and the energy storage module 6. It is used to perform high-frequency voltage regulation on the input DC power or the third power output from the energy storage module 6 and output the first power and the second power.

[0032] The first output module 3 is connected to the switching power supply module 2 and is used to rectify and filter the first electrical energy and supply power to the connected load.

[0033] The second output module 4 is connected to the switching power supply module 2 and is used to rectify and filter the second electrical energy and supply power to the connected load.

[0034] Output detection module 5 is connected to the first output module 3 and the second output module 4. It is used to detect the connection status of the first output module 3 and the second output module 4 with the load, and outputs a first control signal when the first output module 3 is connected to the load and the second output module 4 is not connected to the load.

[0035] The energy storage module 6 is connected to the output detection module 5 and the second output module 4. It is used to store the second electrical energy and release the third electrical energy when the first control signal is received, and to transmit the third electrical energy to the switching power supply module 2.

[0036] The power detection module 7 is connected to the energy storage module 6 and is used to detect the power of the third electrical energy. When the detected signal is greater than the set full charge threshold, the module 6 controls the energy storage module 6 to transfer the third electrical energy to the switching power supply module 2.

[0037] In a specific embodiment, the power supply module 1 can be a power circuit composed of a power interface, diodes, and capacitors, and can be connected to DC power; the switching power supply module 2 can be a switching power supply circuit composed of a drive controller, resistors, diodes, transformers, etc., and can perform voltage sampling and high-frequency isolation transformer regulation of the input power and provide multi-channel output power supply; the first output module 3 can be a first output circuit composed of an output port, diodes, and capacitors, which performs output rectification and filtering and supplies power to the connected load; the second output module 4 can be a second output circuit composed of an output port, diodes, and capacitors, which performs output... The circuit rectifies and filters the power supply to the connected load. The output detection module 5 can be an output detection circuit composed of an optocoupler, a resistor, and a logic chip. It can detect the connection status of the first output module 3 and the second output module 4 with the load, and output a high-level signal when the first output module 3 is connected to the load and the second output module 4 is not connected to the load. The energy storage module 6 can be an energy storage circuit composed of a field-effect transistor, an energy storage device, and a boost device. It can perform energy storage control and discharge boost control. The power detection module 7 can be a power detection circuit composed of a resistor and a full-charge detection device. It can perform full-charge detection on the energy storage module 6.

[0038] In another embodiment, please refer to Figure 1 , Figure 2 and Figure 3 Power module 1 includes a power interface, a first diode D1 and a first capacitor C1; switching power module 2 includes a first resistor R1, a second resistor R2, a fourth capacitor C4, a first driver IC1, a third resistor R3, a fourth resistor R4, a fifth diode D5, a second diode D2 and a first transformer B1.

[0039] Specifically, the first end of the power interface is connected to the anode of the first diode D1. The cathode of the first diode D1 is connected to one end of the first resistor R1, the VIN terminal of the first driver IC1, the anode of the fifth diode D5, and the first end of the primary side of the first transformer B1. The second end of the power interface is connected through the first capacitor C1, one end of the second resistor R2, one end of the fourth capacitor C4, the GND terminal of the first driver IC1, and one end of the fourth resistor R4. The other end of the fourth resistor R4 is connected to the SENSE terminal of the first driver IC1. The other end of the fourth capacitor C4 is connected to the SS terminal of the first driver IC1. The EN terminal of the first driver IC1 is connected to the other end of the second capacitor C2 and the other end of the first resistor R1. The FB terminal of the first driver IC1 is connected through the other end of the third resistor R3 to the SW terminal of the first driver IC1, the anode of the second diode D2, and the second end of the primary side of the first transformer B1. The cathode of the fifth diode D5 is connected to the cathode of the second diode D2.

[0040] In a specific embodiment, the first driver IC1 described above may be a PC4421 driver.

[0041] Furthermore, the first output module 3 includes a third diode D3, a second capacitor C2, and a first port; the second output module 4 includes a fourth diode D4, a third capacitor C3, and a second port.

[0042] Specifically, the anode of the third diode D3 is connected to the first end of the first secondary side of the first transformer B1, the cathode of the third diode D3 is connected to the first end of the first port and connected to the second end of the first secondary side of the first transformer B1 through the second capacitor C2, the anode of the fourth diode D4 is connected to the first end of the second secondary side of the first transformer B1, the cathode of the fourth diode D4 is connected to the first end of the second port and connected to the first end of the second secondary side of the first transformer B1 and the ground through the third capacitor C3.

[0043] In a specific embodiment, the third diode D3 and the second capacitor C2, the fourth diode D4 and the third capacitor C3 all perform rectification and filtering operations.

[0044] Furthermore, the output detection module 5 includes a fifth resistor R5, a first optocoupler J1, a first power supply VCC1, a seventh resistor R7, an eighth resistor R8, a second optocoupler J2, a sixth resistor R6, and a first logic chip J3.

[0045] Specifically, the first end of the first optocoupler J1 is connected to the second end of the first port, the second end of the first optocoupler J1 is connected to the second end of the first secondary side of the first transformer B1 through the fifth resistor R5, the third end of the first optocoupler J1 is connected to the first power supply VCC1 and the A end of the first logic chip J3 and is connected to the third end of the second optocoupler J2 through the seventh resistor R7, the fourth end of the first optocoupler J1 is connected to the B end of the first logic chip J3 and is connected to the fourth end of the second optocoupler J2 and the ground through the eighth resistor R8, the first end of the fourth optocoupler is connected to the second end of the second port, and the second end of the fourth optocoupler is connected to the second end of the second secondary side of the first transformer B1 through the sixth resistor R6.

[0046] In a specific embodiment, both the first optocoupler J1 and the second optocoupler J2 can be PC817 optocouplers; the first logic chip J3 can be an AND gate chip.

[0047] Furthermore, the energy storage module 6 includes an energy storage device, a first power transistor Q1, a second power transistor Q2, and a boost converter;

[0048] Specifically, the first end of the energy storage device is connected to the source of the first power transistor Q1 and the drain of the second power transistor Q2. The drain of the first power transistor Q1 is connected to the cathode of the fourth diode D4. The gate of the second power transistor Q2 is connected to the power detection module 7. The gate of the first power transistor Q1 is connected to the Y terminal of the first logic chip J3. The second end of the energy storage device is connected to the ground terminal and the ground terminal of the boost device. The input terminal of the boost device is connected to the source of the second power transistor Q2. The output terminal of the boost device is connected to the VIN terminal of the first driver IC1.

[0049] In a specific embodiment, the energy storage device can be a storage battery; the first power transistor Q1 and the second power transistor Q2 can both be N-channel MOSFETs; the boost device can be composed of a voltage regulator, a capacitor and a resistor to perform boost operation.

[0050] Furthermore, the power detection module 7 includes a ninth resistor R9, a tenth resistor R10, and a full-charge detection device;

[0051] Specifically, one end of the ninth resistor R9 is connected to the first end of the energy storage device, the other end of the ninth resistor R9 is connected to the input end of the full charge detection device and connected to the second end of the energy storage device through the tenth resistor R10, and the output end of the full charge detection device is connected to the gate of the second power transistor Q2.

[0052] In a specific embodiment, the above-mentioned full charge detection device may consist of a reference power supply and a comparator, wherein the reference power supply sets the full charge threshold and the comparator performs voltage comparison.

[0053] In this embodiment of an isolated switching power supply circuit, DC power is input through a power interface. A first diode D1 transmits power unidirectionally, and a first capacitor C1 performs filtering. A first driver IC1, in conjunction with a fifth diode D5, a second diode D2, a third resistor R3, a fourth resistor R4, a fourth capacitor C4, a first resistor R1, and a second resistor R2, controls a first transformer B1 to perform high-frequency isolated voltage regulation and output first and second electrical energy. The first electrical energy, after rectification and filtering by the third diode D3 and the second capacitor C2, is transmitted to the first port. Similarly, the second electrical energy, after processing by the fourth diode D4 and the third capacitor C3, is transmitted to the second port. When both the first and second ports are connected to a load, normal multi-channel power supply control is achieved. When the first port is connected to the load and the second port is not connected to the load, the first optocoupler J1 is turned on and the second optocoupler J2 is turned off, making the A and B terminals of the first logic chip J3 both high level. The Y terminal of the first logic chip J3 will control the first power transistor Q1 to turn on, so that the energy storage device stores the electrical energy output after processing by the fourth diode D4 and the third capacitor C3. At the same time, the ninth resistor R9 and the tenth resistor R10 perform voltage division sampling, and the full charge detection device performs full charge detection. When the energy storage device is fully charged, the full charge detection device triggers the second power transistor Q2 to turn on. The electrical energy released by the energy storage device is transmitted through the second power transistor Q2. After being boosted by the boost device, it is transmitted to the first driver IC1 and the first transformer B1 to supply power to the switching power supply module 2.

[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. An isolated switching power supply circuit, characterized in that, The isolated switching power supply circuit includes: a power supply module, a switching power supply module, a first output module, a second output module, an output detection module, an energy storage module, and a power detection module. The power module is used to connect to DC power. The switching power supply module is connected to the power supply module and the energy storage module, and is used to perform high-frequency voltage regulation on the input DC power or the third power output from the energy storage module and output the first power and the second power. The first output module is connected to the switching power supply module and is used to rectify and filter the first electrical energy and supply power to the connected load. The second output module is connected to the switching power supply module and is used to rectify and filter the second electrical energy and supply power to the connected load. The output detection module is connected to the first output module and the second output module, and is used to detect the connection status of the first output module and the second output module with the load, and output a first control signal when the first output module is connected to the load and the second output module is not connected to the load. The energy storage module is connected to the output detection module and the second output module, and is used to store the second electrical energy and release the third electrical energy when the first control signal is received, and transmit the third electrical energy to the switching power supply module. The power detection module is connected to the energy storage module and is used to detect the power of the third electrical energy. When the detected signal is greater than the set full charge threshold, the module controls the energy storage module to transmit the third electrical energy to the switching power supply module.

2. The isolated switching power supply circuit according to claim 1, characterized in that, The power supply module includes a power interface, a first diode, and a first capacitor; the switching power supply module includes a first resistor, a second resistor, a fourth capacitor, a first driver, a third resistor, a fourth resistor, a fifth diode, a second diode, and a first transformer; The first end of the power interface is connected to the anode of the first diode. The cathode of the first diode is connected to one end of the first resistor, the VIN terminal of the first driver, the anode of the fifth diode, and the first end of the primary side of the first transformer. It is connected to the second end of the power interface, one end of the second resistor, one end of the fourth capacitor, the GND terminal of the first driver, and one end of the fourth resistor through the first capacitor. The other end of the fourth resistor is connected to the SENSE terminal of the first driver. The other end of the fourth capacitor is connected to the SS terminal of the first driver. The EN terminal of the first driver is connected to the other end of the second capacitor and the other end of the first resistor. The FB terminal of the first driver is connected to the SW terminal of the first driver, the anode of the second diode, and the second end of the primary side of the first transformer through the other end of the third resistor. The cathode of the fifth diode is connected to the cathode of the second diode.

3. The isolated switching power supply circuit according to claim 2, characterized in that, The first output module includes a third diode, a second capacitor, and a first port; the second output module includes a fourth diode, a third capacitor, and a second port. The anode of the third diode is connected to the first end of the first secondary side of the first transformer, and the cathode of the third diode is connected to the first end of the first port and connected to the second end of the first secondary side of the first transformer through the second capacitor. The anode of the fourth diode is connected to the first end of the second secondary side of the first transformer, and the cathode of the fourth diode is connected to the first end of the second port and connected to the first end of the second secondary side of the first transformer and ground through the third capacitor.

4. The isolated switching power supply circuit according to claim 3, characterized in that, The output detection module includes a fifth resistor, a first optocoupler, a first power supply, a seventh resistor, an eighth resistor, a second optocoupler, a sixth resistor, and a first logic chip; The first end of the first optocoupler is connected to the second end of the first port. The second end of the first optocoupler is connected to the second end of the first secondary side of the first transformer through the fifth resistor. The third end of the first optocoupler is connected to the first power supply and the A end of the first logic chip, and is connected to the third end of the second optocoupler through the seventh resistor. The fourth end of the first optocoupler is connected to the B end of the first logic chip, and is connected to the fourth end of the second optocoupler and the ground through the eighth resistor. The first end of the fourth optocoupler is connected to the second end of the second port. The second end of the fourth optocoupler is connected to the second end of the second secondary side of the first transformer through the sixth resistor.

5. The isolated switching power supply circuit according to claim 4, characterized in that, The energy storage module includes an energy storage device, a first power transistor, a second power transistor, and a boost converter; The first end of the energy storage device is connected to the source of the first power transistor and the drain of the second power transistor. The drain of the first power transistor is connected to the cathode of the fourth diode. The gate of the second power transistor is connected to the power detection module. The gate of the first power transistor is connected to the Y terminal of the first logic chip. The second end of the energy storage device is connected to the ground terminal and the ground terminal of the boost device. The input terminal of the boost device is connected to the source of the second power transistor. The output terminal of the boost device is connected to the VIN terminal of the first driver.

6. The isolated switching power supply circuit according to claim 5, characterized in that, The power detection module includes a ninth resistor, a tenth resistor, and a full-charge detection device; One end of the ninth resistor is connected to the first end of the energy storage device, and the other end of the ninth resistor is connected to the input end of the full charge detection device and connected to the second end of the energy storage device through the tenth resistor. The output end of the full charge detection device is connected to the gate of the second power transistor.

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