A high power density switching power supply circuit

Abstract

The utility model discloses a high power density switching power supply circuit relates to switching power supply technical field, including switching power supply module, can to the electric energy of first output module output electric energy sampling and according to the signal of sampling to the dc electric energy of access carries out high -frequency voltage regulation processing, by first output module and second output module carry out voltage stabilizing processing, by high power control module can control first output module and second output module carry out electric energy superposition processing, simultaneously protection control module can to the electric energy of output after superposition carries out overvoltage detection, and when overvoltage, control second output module stops output electric energy, control high power control module stops working. The utility model discloses high power density switching power supply circuit can improve output power, improve switching power supply and carry out high -power power supply's security.

Description

Technical Field

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

[0002] A switching power supply is a type of power supply that uses modern power electronics technology to control the on and off time ratio of switching transistors to maintain a stable output voltage. Switching power supplies are generally composed of a pulse width modulation control IC and MOSFETs. In current technology, most switching power supplies have multiple outputs; however, the output power of each output port is limited, making it impossible to further increase the output power. Furthermore, in the event of a high-power abnormal power supply, it is impossible to accurately disconnect the faulty output branch, thus requiring improvement. Utility Model Content

[0003] This invention provides a high power density 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 high power density switching power supply circuit includes: a switching power supply module, a first output module, a second output module, a high power control module, and a protection control module;

[0006] A switching power supply module, connected to the first output module, is used to receive DC power and sample the third power output by the first output module, and to perform high-frequency isolation transformer processing on the DC power according to the sampled signal, and output the first power and the second power.

[0007] The first output module is used to rectify and filter the first electrical energy and output the third electrical energy, and transmit the third electrical energy to the connected load.

[0008] A high-power control module, connected to the first output module and the second output module, is used to receive third electrical energy and transmit the third electrical energy to the second output module and perform electrical energy superposition processing, and to control the first output module to stop transmitting the third electrical energy.

[0009] The second output module is connected to the switching power supply module. It is used to rectify and filter the second electrical energy and output the fourth electrical energy. It performs voltage superposition processing on the third electrical energy transmitted by the high power control module and the fourth electrical energy and outputs the fifth electrical energy. It transmits the fourth electrical energy or the fifth electrical energy to the connected load.

[0010] The protection control module, connected to the second output module and the high-power control module, is used to sample the voltage of the fifth electrical energy and, when the sampled signal exceeds the set overvoltage threshold, control the second output module to stop the power transmission and control the high-power control module to stop working.

[0011] As a further embodiment of this utility model: the switching power supply module includes a power interface, a first capacitor, a first driver, a first power transistor, a first transformer, and a feedback device;

[0012] Preferably, the first end of the power interface is connected to the VCC terminal of the first driver and the first end of the primary side of the first transformer, and is connected to the second end of the power interface, the GND terminal of the first driver, the source and ground of the first power transistor through the first capacitor. The drain of the first power transistor is connected to the second end of the primary side of the first transformer. The OUT terminal of the first driver is connected to the gate of the first power transistor. The FB terminal of the first driver is connected to the output terminal of the feedback device.

[0013] As a further embodiment of this utility model: the first output module includes a second diode, a third capacitor, a third thyristor, a second switching transistor, a first output port, and a third resistor;

[0014] Preferably, the anode of the second diode is connected to the first end of the first secondary side of the first transformer, the cathode of the second diode is connected to the anode of the third thyristor, one end of the third resistor and the input terminal of the feedback device, and is connected through the third capacitor to the second end of the first secondary side of the first transformer, the emitter of the second switch, the ground terminal of the feedback device, one end of the first port and the ground terminal, the cathode of the third thyristor is connected to the other end of the first port, and the control terminal of the third thyristor is connected to the collector of the second switch and the other end of the third resistor.

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

[0016] Preferably, the anode of the first diode is connected to the first end of the second secondary side of the first transformer, the cathode of the first diode is connected to the first end of the second port and one end of the second resistor, and is connected to the second end of the second secondary side of the first transformer and the cathode of the second diode through the second capacitor, the anode of the second diode is connected to the second end of the second port, the emitter of the first switching transistor and the ground terminal, and the control terminal of the second thyristor is connected to the other end of the second resistor and the collector of the first switching transistor.

[0017] As a further embodiment of this utility model: the high-power control module includes a first resistor, a first push-button switch, a first thyristor, and a third diode;

[0018] Preferably, the moving end of the first push-button switch is connected to the cathode of the second diode and the anode of the first thyristor through a first resistor; the stationary end of the first push-button switch is connected to the anode of the third diode, the control terminal of the first thyristor, and the base of the second switching transistor; the cathode of the third diode is connected to the base of the first switching transistor and the protection control module; and the cathode of the first thyristor is connected to the second end of the second secondary side of the first transformer.

[0019] As a further embodiment of this utility model: the protection control module includes a fourth resistor, a fifth resistor, a first comparator, a first reference power supply, and a fourth diode;

[0020] Preferably, the non-inverting input of the first comparator is connected to one end of the fifth resistor and connected to the first end of the second port through the fourth resistor, the other end of the fifth resistor is connected to the second end of the second port, the inverting input of the first comparator is connected to the first reference power supply, the output of the first comparator is connected to the anode of the fourth diode and the base of the third switching transistor, and the cathode of the fourth diode is connected to the base of the first switching transistor.

[0021] Compared with the prior art, the beneficial effects of this utility model are as follows: The high power density switching power supply circuit of this utility model can sample the electrical energy output by the first output module and perform high-frequency voltage regulation processing based on the sampled signal. The first output module and the second output module perform voltage regulation processing. The high power control module can control the first output module and the second output module to perform electrical energy superposition processing to improve the output power. At the same time, the protection control module can perform overvoltage detection on the superimposed output electrical energy, and when overvoltage occurs, control the second output module to stop outputting electrical energy and control the high power control module to stop working, thereby improving the safety of the switching power supply for high power supply. Attached Figure Description

[0022] 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.

[0023] Figure 1 This is a schematic block diagram of a high power density switching power supply circuit provided for this utility model embodiment.

[0024] Figure 2 A circuit diagram of a high power density switching power supply circuit provided for this utility model embodiment.

[0025] Figure 3 A connection circuit diagram of the protection control module provided for this utility model embodiment. Detailed Implementation

[0026] 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.

[0027] In one embodiment, see Figure 1 A high power density switching power supply circuit includes: a switching power supply module 1, a first output module 2, a second output module 3, a high power control module 4, and a protection control module 5;

[0028] Specifically, the switching power supply module 1 is connected to the first output module 2, and is used to receive DC power and sample the third power output by the first output module 2, and perform high-frequency isolation transformer processing on the DC power according to the sampled signal to output the first power and the second power.

[0029] The first output module 2 is used to rectify and filter the first electrical energy and output the third electrical energy, and transmit the third electrical energy to the connected load.

[0030] The high-power control module 4 is connected to the first output module 2 and the second output module 3. It is used to receive the third electrical energy and transmit the third electrical energy to the second output module 3 and perform electrical energy superposition processing, and control the first output module 2 to stop transmitting the third electrical energy.

[0031] The second output module 3 is connected to the switching power supply module 1. It is used to rectify and filter the second electrical energy and output the fourth electrical energy, perform voltage superposition processing on the third electrical energy transmitted by the high power control module 4 and the fourth electrical energy and output the fifth electrical energy, and transmit the fourth electrical energy or the fifth electrical energy to the connected load.

[0032] The protection control module 5 is connected to the second output module 3 and the high-power control module 4. It is used to sample the voltage of the fifth electrical energy and, when the sampled signal is greater than the set overvoltage threshold, control the second output module 3 to stop the power transmission and control the high-power control module 4 to stop working.

[0033] In a specific embodiment, the aforementioned switching power supply module 1 can be a switching power supply circuit composed of a transformer, power interface, driving device, field-effect transistor, etc., which can sample the output power of the first output module 2 and perform high-frequency regulation processing on the input DC power based on the sampled signal; the aforementioned first output module 2 can be a first output circuit composed of diodes, capacitors, thyristors, output ports, etc., which can rectify, filter, and control the power transmission of the input power; the aforementioned second output module 3 can be a second output circuit composed of diodes, capacitors, thyristors, output ports, etc., which can rectify, filter, and control the power transmission of the input power; the aforementioned high-power control module 4 can be a high-power control circuit containing resistors, thyristors, diodes, etc., which can control the power transmission state of the first output module 2 and the second output module 3 and transmit the power output of the first output module 2, and perform power superposition processing on the transmitted power and the power of the second output module 3; the aforementioned protection control module 5 can be a protection control circuit composed of resistors, comparators, reference power supplies, etc., which can perform voltage sampling and overvoltage judgment.

[0034] In another embodiment, please refer to Figure 1 , Figure 2 and Figure 3 The switching power supply module 1 includes a power interface, a first capacitor C1, a first driver IC1, a first power transistor Q1, a first transformer B1, and a feedback device.

[0035] Specifically, the first end of the power interface is connected to the VCC terminal of the first driver IC1 and the first end of the primary side of the first transformer B1, and is connected to the second end of the power interface, the GND terminal of the first driver IC1, the source and ground of the first power transistor Q1 through the first capacitor C1. The drain of the first power transistor Q1 is connected to the second end of the primary side of the first transformer B1. The OUT terminal of the first driver IC1 is connected to the gate of the first power transistor Q1. The FB terminal of the first driver IC1 is connected to the output terminal of the feedback device.

[0036] In a specific embodiment, the first driver IC1 can be a UC3842 driver; the first power transistor Q1 can be an N-channel MOSFET; and the feedback device can be composed of a resistor, a capacitor, an optocoupler, and a TL431 voltage regulator.

[0037] Furthermore, the first output module 2 includes a second diode D2, a third capacitor C3, a third thyristor S3, a second switch V2, a first output port, and a third resistor R3;

[0038] Specifically, the anode of the second diode D2 is connected to the first end of the first secondary side of the first transformer B1, the cathode of the second diode D2 is connected to the anode of the third thyristor S3, one end of the third resistor R3 and the input terminal of the feedback device, and is connected through the third capacitor C3 to the second end of the first secondary side of the first transformer B1, the emitter of the second switch V2, the ground terminal of the feedback device, one end of the first port and the ground terminal, the cathode of the third thyristor S3 is connected to the other end of the first port, and the control terminal of the third thyristor S3 is connected to the collector of the second switch V2 and the other end of the third resistor R3.

[0039] In a specific embodiment, the third thyristor S3 can be a unidirectional thyristor; the second switching transistor V2 can be an NPN transistor.

[0040] Furthermore, the second output module 3 includes a first diode D1, a second capacitor C2, a second resistor R2, a second thyristor S2, a first switch V1, and a second port;

[0041] Specifically, the anode of the first diode D1 is connected to the first end of the second secondary side of the first transformer B1, the cathode of the first diode D1 is connected to the first end of the second port and one end of the second resistor R2, and is connected to the second end of the second secondary side of the first transformer B1 and the cathode of the second diode D2 through the second capacitor C2, the anode of the second diode D2 is connected to the second end of the second port, the emitter of the first switch V1 and the ground terminal, and the control terminal of the second thyristor S2 is connected to the other end of the second resistor R2 and the collector of the first switch V1.

[0042] In a specific embodiment, the second thyristor S2 can be a unidirectional thyristor; the first switching transistor V1 can be an NPN transistor.

[0043] Furthermore, the high-power control module 4 includes a first resistor R1, a first push-button switch K1, a first thyristor S1, and a third diode D3;

[0044] Specifically, the moving end of the first push-button switch K1 is connected to the cathode of the second diode D2 and the anode of the first thyristor S1 through the first resistor R1. The stationary end of the first push-button switch K1 is connected to the anode of the third diode D3, the control terminal of the first thyristor S1, and the base of the second switch V2. The cathode of the third diode D3 is connected to the base of the first switch V1 and the protection control module 5. The cathode of the first thyristor S1 is connected to the second end of the second secondary side of the first transformer B1.

[0045] In a specific embodiment, the first thyristor S1 can be a unidirectional thyristor.

[0046] Furthermore, the protection control module 5 includes a fourth resistor R4, a fifth resistor R5, a first comparator A1, a first reference power supply VREF, and a fourth diode D4;

[0047] Specifically, the non-inverting input of the first comparator A1 is connected to one end of the fifth resistor R5 and to the first end of the second port through the fourth resistor R4. The other end of the fifth resistor R5 is connected to the second end of the second port. The inverting input of the first comparator A1 is connected to the first reference power supply VREF. The output of the first comparator A1 is connected to the anode of the fourth diode D4 and the base of the third switching transistor. The cathode of the fourth diode D4 is connected to the base of the first switching transistor V1.

[0048] In a specific embodiment, the first comparator A1 can be an LM358 comparator; the first reference power supply VREF can be set with an overvoltage threshold so that the first comparator A1 can perform overvoltage comparison and judgment.

[0049] In this embodiment of a high power density switching power supply circuit, DC power is input through a power interface. The OUT terminal of the first driver IC1 drives the first power transistor Q1 to conduct. The first diode D1 and the second capacitor C2 perform rectification and filtering to output a fourth power. The second resistor R2 triggers the second thyristor S2 to conduct and transmits the fourth power to the first port. The second diode D2 and the third capacitor C3 perform rectification and filtering to output a third power. The third resistor R3 triggers the third thyristor S3 to conduct and transmits the third power to the first port. When the first button switch K1 is pressed, the first thyristor S1, the first switching transistor V1, and the second switching transistor V2 are all turned on, causing the second thyristor S2 and the first power transistor V1 to conduct. When the third thyristor S3 is turned off, the second diode D2 transfers the third electrical energy to the second capacitor C2, so that it can be superimposed with the fourth electrical energy to output the fifth electrical energy. The fifth electrical energy is then transferred to the second port. The fourth resistor R4 and the fifth resistor R5 sample the voltage of the electrical energy input to the second port. When the sampled signal is greater than the overvoltage threshold set by the first reference power supply VREF, the first comparator A1 will trigger the first switch V1 and the third switch to turn on, controlling the second thyristor S2 to turn off, and the second port will stop supplying power. The third switch pulls down the voltage at the static terminal of the first push-button switch K1, so that the third resistor R3 will re-trigger the third thyristor S3 to turn on, so that the first port can be supplied with power normally.

[0050] 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.

[0051] 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 high power density switching power supply circuit, characterized in that, The high power density switching power supply circuit includes: a switching power supply module, a first output module, a second output module, a high power control module, and a protection control module; A switching power supply module is connected to the first output module. It is used to receive DC power and sample the third power output by the first output module. Based on the sampled signal, it performs high-frequency isolation transformer processing on the DC power and outputs the first power and the second power. The first output module is used to rectify and filter the first electrical energy and output the third electrical energy, and transmit the third electrical energy to the connected load. A high-power control module, connected to the first output module and the second output module, is used to receive third electrical energy and transmit the third electrical energy to the second output module and perform electrical energy superposition processing, and to control the first output module to stop transmitting the third electrical energy. The second output module is connected to the switching power supply module. It is used to rectify and filter the second electrical energy and output the fourth electrical energy. It performs voltage superposition processing on the third electrical energy transmitted by the high power control module and the fourth electrical energy and outputs the fifth electrical energy. It transmits the fourth electrical energy or the fifth electrical energy to the connected load. The protection control module, connected to the second output module and the high-power control module, is used to sample the voltage of the fifth electrical energy and, when the sampled signal exceeds the set overvoltage threshold, control the second output module to stop the power transmission and control the high-power control module to stop working.

2. A high power density switching power supply circuit according to claim 1, wherein, The switching power supply module includes a power interface, a first capacitor, a first driver, a first power transistor, a first transformer, and a feedback device. The first end of the power interface is connected to the VCC terminal of the first driver and the first end of the primary side of the first transformer, and is connected to the second end of the power interface, the GND terminal of the first driver, the source and ground of the first power transistor through the first capacitor. The drain of the first power transistor is connected to the second end of the primary side of the first transformer. The OUT terminal of the first driver is connected to the gate of the first power transistor. The FB terminal of the first driver is connected to the output terminal of the feedback device.

3. A high power density switching power supply circuit according to claim 2, wherein, The first output module includes a second diode, a third capacitor, a third thyristor, a second switching transistor, a first output port, and a third resistor; The anode of the second diode is connected to the first end of the first secondary side of the first transformer. The cathode of the second diode is connected to the anode of the third thyristor, one end of the third resistor, and the input terminal of the feedback device. It is also connected to the second end of the first secondary side of the first transformer, the emitter of the second switch, the ground terminal of the feedback device, one end of the first port, and the ground terminal through the third capacitor. The cathode of the third thyristor is connected to the other end of the first port. The control terminal of the third thyristor is connected to the collector of the second switch and the other end of the third resistor.

4. A high power density switching power supply circuit according to claim 3, wherein, The second output module includes a first diode, a second capacitor, a second resistor, a second thyristor, a first switching transistor, and a second port; The anode of the first diode is connected to the first end of the second secondary side of the first transformer. The cathode of the first diode is connected to the first end of the second port and one end of the second resistor, and is connected to the second end of the second secondary side of the first transformer and the cathode of the second diode through the second capacitor. The anode of the second diode is connected to the second end of the second port, the emitter of the first switching transistor, and the ground terminal. The control terminal of the second thyristor is connected to the other end of the second resistor and the collector of the first switching transistor.

5. A high power density switching power supply circuit according to claim 4, wherein, The high-power control module includes a first resistor, a first push-button switch, a first thyristor, and a third diode; The moving end of the first push-button switch is connected to the cathode of the second diode and the anode of the first thyristor through the first resistor. The stationary end of the first push-button switch is connected to the anode of the third diode, the control terminal of the first thyristor, and the base of the second switching transistor. The cathode of the third diode is connected to the base of the first switching transistor and the protection control module. The cathode of the first thyristor is connected to the second end of the second secondary side of the first transformer.

6. A high power density switching power supply circuit according to claim 5, wherein, The protection control module includes a fourth resistor, a fifth resistor, a first comparator, a first reference power supply, and a fourth diode; The non-inverting input of the first comparator is connected to one end of the fifth resistor and then to the first end of the second port through the fourth resistor. The other end of the fifth resistor is connected to the second end of the second port. The inverting input of the first comparator is connected to the first reference power supply. The output of the first comparator is connected to the anode of the fourth diode and the base of the third switching transistor. The cathode of the fourth diode is connected to the base of the first switching transistor.

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