A switching power supply control circuit

Abstract

The utility model discloses a switching power supply control circuit relates to switching power supply technical field, including switching power supply module, carries out voltage sampling to first output module, according to the signal of sampling carries out high -frequency isolation voltage -current conversion processing to the direct current electric energy of power module access, rectification filtering and output are carried out by first output module again, by first output module control negative value adjustment module carries out negative value adjustment processing to the electric energy of input, transfers to second output module again to provide negative value electric energy, and mode switching module can control negative value adjustment module to stop negative value adjustment work and through switching the connection state of second output module and first output module, realizes second output module output positive value. The utility model discloses switching power supply control circuit can realize double positive value power supply or one positive one negative power supply, carries out double mode power supply, improves the power supply intelligence of switching power supply.

Description

Technical Field

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

[0002] A switching power supply refers to a power supply that uses electronic switching devices (such as transistors and field-effect transistors) to continuously "turn on" and "turn off" the power switching devices through a control circuit. This allows the electronic switching devices to control the input voltage through pulse modulation, thereby achieving voltage conversion and adjustable and automatically regulated output voltage. In existing technologies, switching power supplies typically use a primary transformer with two secondary transformers to provide more power supply voltage, enabling dual-output power supply. However, this dual-output can only use two positive power supplies or one positive and one negative discharge mode, and cannot select the required power state according to power demand. The intelligence of switching power supplies is relatively low, and therefore needs improvement. Utility Model Content

[0003] This utility model provides a switching power supply control 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 switching power supply control circuit includes: a power supply module, a switching power supply module, a first output module, a negative value adjustment module, a second output module, and a mode switching module.

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

[0007] A switching power supply module, connected to the power supply module and the first output module, is used to sample the voltage of the third electrical energy output by the first output module and perform high-frequency isolation transformer regulation on the DC electrical energy, and output the first electrical energy and the second electrical energy.

[0008] 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.

[0009] The negative value adjustment module is connected to the switching power supply module, the first output module and the second output module. It is used to receive the third electrical energy, perform negative value adjustment on the fourth electrical energy output by the second output module and output the fifth electrical energy.

[0010] The second output module is connected to the switching power supply module and is used to rectify and filter the second electrical energy and output the fourth electrical energy, and transmit the fourth or fifth electrical energy to the connected load.

[0011] The mode switching module is connected to the power supply module, the second output module, and the negative value adjustment module. It is used to receive DC power and control the second output module to transmit the fourth power to the load and control the negative value adjustment module to stop receiving the fourth power.

[0012] As a further embodiment of this utility model: the power supply module includes a power interface and a first capacitor; the switching power supply module includes a first driver, a feedback device, a first power transistor, and a first transformer;

[0013] 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 gate of the first power transistor is connected to the OUT terminal of the first driver, and the FB terminal of the first driver is connected to the output terminal of the feedback device.

[0014] As a further embodiment of this utility model: the first output module includes a second diode, a third capacitor, a second resistor, and a first port;

[0015] Preferably, the anode of the second diode is connected to the first end of the first secondary side of the first transformer, and the cathode of the second diode is connected to one end of the second resistor, the first end of the first port, and the input terminal of the feedback device, and is connected to the second end of the first secondary side of the first transformer, the other end of the second resistor, the second end of the first port, and the ground terminal through the third capacitor.

[0016] As a further embodiment of this utility model: the second output module includes a first diode, a second capacitor, a fourth thyristor, a third diode, a third resistor, a fourth capacitor, a second output port, a second thyristor, a first switching transistor, and a third thyristor;

[0017] 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 anode of the fourth thyristor and connected to the second end of the second secondary side of the first transformer through the second capacitor, the cathode of the fourth thyristor is connected to the anode of the third diode and connected to the second end of the second port, one end of the fourth capacitor and one end of the second thyristor through the third resistor, the other end of the second thyristor is connected to the second end of the first port, the emitter of the first switching transistor and one end of the third thyristor, the other end of the fourth capacitor is connected to the first end of the second port, the cathode of the third diode and the other end of the third thyristor, the control terminal of the second thyristor is connected to the base of the first switching transistor and the mode switching module, and the collector of the first switching transistor is connected to the control terminal of the third thyristor.

[0018] As a further embodiment of this utility model: the negative value adjustment module includes a first thyristor, a fifth thyristor, a first resistor, and a first voltage regulator;

[0019] Preferably, one end of the first thyristor and one end of the fifth thyristor are respectively connected to the cathode of the first diode and the second end of the second secondary side of the first transformer. The other end of the first thyristor is connected to the third end of the first voltage regulator and the first end of the second port. The other end of the fifth thyristor is connected to the first end of the first voltage regulator. The second end of the first voltage regulator is connected to the second end of the second port. The control end of the first thyristor is connected to the control end of the second thyristor and the collector of the first switching transistor, and is connected to the cathode of the second diode through the first resistor.

[0020] As a further embodiment of this utility model: the mode switching module includes a fourth resistor, a fifth resistor, a first push-button switch, a second switching transistor, and a sixth resistor;

[0021] Preferably, the moving end of the first push-button switch is connected to one end of the fifth resistor and then to the first end of the power interface and the collector of the second switching transistor via the fourth resistor. The emitter of the second switching transistor is connected to the control terminal of the fourth thyristor, the base of the first switching transistor, and the control terminal of the second thyristor via the sixth resistor and then to the other end of the fifth resistor and the second end of the power interface. The stationary end of the first push-button switch is connected to the base of the second switching transistor.

[0022] Compared with the prior art, the beneficial effects of this utility model are as follows: The switching power supply control circuit of this utility model can sample the voltage of the first output module by the switching power supply module, perform high-frequency isolation transformation processing on the DC power input to the power supply module according to the sampled signal, and then perform rectification, filtering and output by the first output module. The first output module controls the negative value adjustment module to perform negative value adjustment processing on the input power and then transmits it to the second output module to provide negative value power. The mode switching module can control the negative value adjustment module to stop the negative value adjustment work and switch the connection state between the second output module and the first output module to realize the output of positive value by the second output module, realize dual positive value power supply or one positive and one negative power supply, perform dual-mode power supply, and improve the power supply intelligence of the switching power supply. Attached Figure Description

[0023] 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.

[0024] Figure 1 This is a schematic block diagram of a switching power supply control circuit provided for an example of this utility model.

[0025] Figure 2 A circuit diagram of a switching power supply control circuit provided for this utility model embodiment.

[0026] Figure 3 A connection circuit diagram of the mode switching module provided for this utility model embodiment. Detailed Implementation

[0027] 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.

[0028] In one embodiment, see Figure 1 A switching power supply control circuit includes: a power supply module 1, a switching power supply module 2, a first output module 3, a negative value adjustment module 4, a second output module 5, and a mode switching module 6.

[0029] Specifically, power module 1 is used to connect to DC power;

[0030] The switching power supply module 2 is connected to the power supply module 1 and the first output module 3. It is used to sample the voltage of the third electrical energy output by the first output module 3 and perform high-frequency isolation transformer regulation on the DC electrical energy to output the first electrical energy and the second electrical energy.

[0031] The first output module 3 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.

[0032] The negative value adjustment module 4 is connected to the switching power supply module 2, the first output module 3, and the second output module 5. It is used to receive the third electrical energy, perform negative value adjustment on the fourth electrical energy output by the second output module 5, and output the fifth electrical energy.

[0033] The second output module 5 is connected to the switching power supply module 2 and is used to rectify and filter the second electrical energy and output the fourth electrical energy, and transmit the fourth or fifth electrical energy to the connected load.

[0034] The mode switching module 6 is connected to the power supply module 1, the second output module 5 and the negative value adjustment module 4. It is used to receive DC power and control the second output module 5 to transmit the fourth power to the load and control the negative value adjustment module 4 to stop receiving the fourth power.

[0035] In a specific embodiment, the power supply module 1 can be a power circuit composed of a power interface and a capacitor, which can be connected to DC power; the switching power supply module 2 can be a switching power supply circuit composed of a drive controller, a field-effect transistor, a transformer, and a feedback device, which can sample the voltage of the first output module 3 and perform high-frequency isolation transformation processing on the DC power; the first output module 3 can be a first output circuit composed of diodes, capacitors, resistors, and an output port, which can perform rectification, filtering, and power output; the negative value adjustment module 4 can be a negative value adjustment circuit composed of a voltage regulator, a thyristor, and a resistor, which can perform negative value adjustment processing on the input signal; the second output module 5 can be a second output circuit composed of diodes, capacitors, a thyristor, an output port, etc., which can perform rectification, filtering, and power transmission control; the mode switching module 6 can be a mode switching circuit composed of a resistor, a push-button switch, and a transistor, which can control the negative value adjustment working state of the negative value adjustment module 4, the power transmission state of the second output module 5, and the connection state between the second output module 5 and the first output module 3.

[0036] In another embodiment, please refer to Figure 1 , Figure 2 and Figure 3 Power module 1 includes a power interface and a first capacitor C1; switching power module 2 includes a first driver IC1, a feedback device, a first power transistor Q1, and a first transformer B1.

[0037] 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 gate of the first power transistor Q1 is connected to the OUT terminal of the first driver IC1, and the FB terminal of the first driver IC1 is connected to the output terminal of the feedback device.

[0038] In a specific embodiment, the first driver IC1 can be a UC3843 driver; the feedback device can be composed of an optocoupler and a TL431; and the first power transistor Q1 can be an NPN transistor.

[0039] Furthermore, the first output module 3 includes a second diode D2, a third capacitor C3, a second resistor R2, and a first port;

[0040] Specifically, the anode of the second diode D2 is connected to the first end of the first secondary side of the first transformer B1, and the cathode of the second diode D2 is connected to one end of the second resistor R2, the first end of the first port, and the input terminal of the feedback device, and is connected to the second end of the first secondary side of the first transformer B1, the other end of the second resistor R2, the second end of the first port, and the ground terminal through the third capacitor C3.

[0041] In a specific embodiment, the second diode D2 and the third capacitor C3 are used for rectification and filtering.

[0042] Furthermore, the second output module 5 includes a first diode D1, a second capacitor C2, a fourth thyristor S4, a third diode D3, a third resistor R3, a fourth capacitor C4, a second output port, a second thyristor S2, a first switching transistor V1, and a third thyristor S3.

[0043] 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 anode of the fourth thyristor S4 and connected to the second end of the second secondary side of the first transformer B1 through the second capacitor C2, the cathode of the fourth thyristor S4 is connected to the anode of the third diode D3 and connected to the second end of the second port, one end of the fourth capacitor C4 and one end of the second thyristor S2 through the third resistor R3, the other end of the second thyristor S2 is connected to the second end of the first port, the emitter of the first switch V1 and one end of the third thyristor S3, the other end of the fourth capacitor C4 is connected to the first end of the second port, the cathode of the third diode D3 and the other end of the third thyristor S3, the control terminal of the second thyristor S2 is connected to the base of the first switch V1 and the mode switching module 6, and the collector of the first switch V1 is connected to the control terminal of the third thyristor S3.

[0044] In a specific embodiment, the fourth thyristor S4 can be a unidirectional thyristor; the second thyristor S2 and the third thyristor S3 can both be bidirectional thyristors; and the first switching transistor V1 can be an NPN transistor.

[0045] Furthermore, the negative value adjustment module 4 includes a first thyristor S1, a fifth thyristor S5, a first resistor R1, and a first voltage regulator IC2;

[0046] Specifically, one end of the first thyristor S1 and one end of the fifth thyristor S5 are respectively connected to the cathode of the first diode D1 and the second end of the second secondary side of the first transformer B1. The other end of the first thyristor S1 is connected to the third end of the first voltage regulator IC2 and the first end of the second port. The other end of the fifth thyristor S5 is connected to the first end of the first voltage regulator. The second end of the first voltage regulator IC2 is connected to the second end of the second port. The control end of the first thyristor S1 is connected to the control end of the second thyristor S2 and the collector of the first switching transistor V1, and is connected to the cathode of the second diode D2 through the first resistor R1.

[0047] In a specific embodiment, both the first thyristor S1 and the second thyristor S2 can be bidirectional thyristors; the first voltage regulator IC2 can be a 79M12 voltage regulator.

[0048] Furthermore, the mode switching module 6 includes a fourth resistor R4, a fifth resistor R5, a first push button switch K1, a second switch transistor V2, and a sixth resistor R6.

[0049] Specifically, the moving end of the first push-button switch K1 is connected to one end of the fifth resistor R5 and then to the first end of the power interface and the collector of the second switch V2 through the fourth resistor R4. The emitter of the second switch V2 is connected to the control terminal of the fourth thyristor S4, the base of the first switch V1 and the control terminal of the second thyristor S2, and then to the other end of the fifth resistor R5 and the second end of the power interface through the sixth resistor R6. The stationary end of the first push-button switch K1 is connected to the base of the second switch V2.

[0050] In a specific embodiment, the second switching transistor V2 can be an NPN transistor.

[0051] In this embodiment of a switching power supply control circuit, DC power is input through a power interface. A first capacitor C1 filters the power. The OUT terminal of the first driver IC1 drives the first power transistor Q1 to conduct, thereby controlling the first transformer B1 to perform high-frequency isolation transformation. A second diode D2 and a third capacitor C3 rectify and filter the power, outputting a third power source. A feedback device samples the voltage of the third power source and provides a feedback signal to the FB terminal of the first driver IC1. A first resistor R1 triggers the first thyristor S1, the fifth thyristor S5, and the third thyristor S3 to conduct. After rectification and filtering by the first diode D1 and the second capacitor C2, the power is transmitted through the first thyristor S1 and the fifth thyristor S5. The first voltage regulator I... C2 performs negative voltage regulation and provides negative power to the second terminal of the second port. When dual positive power supply is required, the first button switch K1 can be pressed. The DC power is divided by the fourth resistor R4 and the fifth resistor R5. The first button switch K1 transmits and triggers the second switch V2 to conduct, which in turn triggers the fourth thyristor S4, the first switch V1 and the second thyristor S2 to conduct, so that the first thyristor S1, the fifth thyristor S5 and the third thyristor S3 are cut off. The first regulator IC2 stops working. The power after rectification and filtering by the first diode D1 and the second capacitor C2 is transmitted to the second port through the fourth thyristor S4 and the third diode D3, which in turn provides a positive voltage to the first terminal of the second port.

[0052] 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.

[0053] 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 switching power supply control circuit, characterized in that, The switching power supply control circuit includes: a power supply module, a switching power supply module, a first output module, a negative value adjustment module, a second output module, and a mode switching 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 first output module. It is used to sample the voltage of the third electrical energy output by the first output module and perform high-frequency isolation transformer regulation on the DC electrical energy to output the first electrical energy and the second electrical energy. 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. The negative value adjustment module is connected to the switching power supply module, the first output module and the second output module. It is used to receive the third electrical energy, perform negative value adjustment processing on the fourth electrical energy output by the second output module and output the fifth electrical energy. The second output module is connected to the switching power supply module and is used to rectify and filter the second electrical energy and output the fourth electrical energy, and transmit the fourth or fifth electrical energy to the connected load. The mode switching module is connected to the power supply module, the second output module and the negative value adjustment module. It is used to receive DC power and control the second output module to transmit the fourth power to the load and control the negative value adjustment module to stop receiving the fourth power.

2. The switching power supply control circuit according to claim 1, characterized in that, The power supply module includes a power interface and a first capacitor; the switching power supply module includes a first driver, a feedback device, a first power transistor, and a first transformer. 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 gate of the first power transistor is connected to the OUT terminal of the first driver, and the FB terminal of the first driver is connected to the output terminal of the feedback device.

3. The switching power supply control circuit according to claim 2, characterized in that, The first output module includes a second diode, a third capacitor, a second resistor, and a first port; The anode of the second diode is connected to the first end of the first secondary side of the first transformer, and the cathode of the second diode is connected to one end of the second resistor, the first end of the first port, and the input terminal of the feedback device, and is connected to the second end of the first secondary side of the first transformer, the other end of the second resistor, the second end of the first port, and the ground terminal through the third capacitor.

4. The switching power supply control circuit according to claim 3, characterized in that, The second output module includes a first diode, a second capacitor, a fourth thyristor, a third diode, a third resistor, a fourth capacitor, a second output port, a second thyristor, a first switching transistor, and a third thyristor. 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 anode of the fourth thyristor and is connected to the second end of the second secondary side of the first transformer through the second capacitor. The cathode of the fourth thyristor is connected to the anode of the third diode and is connected to the second end of the second port, one end of the fourth capacitor, and one end of the second thyristor through the third resistor. The other end of the second thyristor is connected to the second end of the first port, the emitter of the first switching transistor, and one end of the third thyristor. The other end of the fourth capacitor is connected to the first end of the second port, the cathode of the third diode, and the other end of the third thyristor. The control terminal of the second thyristor is connected to the base of the first switching transistor and the mode switching module. The collector of the first switching transistor is connected to the control terminal of the third thyristor.

5. A switching power supply control circuit according to claim 4, characterized in that, The negative value adjustment module includes a first thyristor, a fifth thyristor, a first resistor, and a first voltage regulator; One end of the first thyristor and one end of the fifth thyristor are respectively connected to the cathode of the first diode and the second end of the second secondary side of the first transformer. The other end of the first thyristor is connected to the third end of the first voltage regulator and the first end of the second port. The other end of the fifth thyristor is connected to the first end of the first voltage regulator. The second end of the first voltage regulator is connected to the second end of the second port. The control end of the first thyristor is connected to the control end of the second thyristor and the collector of the first switching transistor, and is connected to the cathode of the second diode through the first resistor.

6. A switching power supply control circuit according to claim 5, characterized in that, The mode switching module includes a fourth resistor, a fifth resistor, a first push-button switch, a second switching transistor, and a sixth resistor; The moving end of the first push-button switch is connected to one end of the fifth resistor and then to the first end of the power interface and the collector of the second switching transistor through the fourth resistor. The emitter of the second switching transistor is connected to the control terminal of the fourth thyristor, the base of the first switching transistor, and the control terminal of the second thyristor, and then to the other end of the fifth resistor and the second end of the power interface through the sixth resistor. The stationary end of the first push-button switch is connected to the base of the second switching transistor.

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