An isolated power supply system multiplexing switching circuit and use method

Abstract

The present invention discloses an isolated power supply system multiplexing switching circuit and a method for using the same, belonging to the field of high-voltage technology. The circuit is designed with a power circuit and a control circuit, wherein the power circuit includes a voltage input terminal, a first voltage output terminal, and a second voltage output terminal, wherein a diode and a field-effect transistor are connected between the first voltage output terminal and the second voltage output terminal, and the change of the drive signal is controlled by the command output of the relay, thereby finally realizing the change of the output voltage and completing the multiplexing switching of the power supply system; the circuit reduces two power supplies to one power supply by adjusting the working timing of the system-level product, thereby improving the reliability of the system, reducing the cost of the product, increasing the utilization rate of the power supply, and increasing the power density of the product, and because the combination of the power circuit and the control circuit is adopted, the switching circuit has a strong anti-interference ability; the circuit structure and principle are simple, easy to operate and use, and highly applicable.

Description

Technical Field

[0001] The present invention belongs to the field of high voltage technology, and in particular relates to an isolated power supply system multiplexing switching circuit and a use method thereof. Background Art

[0002] With the advancement of modern society, the application of electricity has penetrated into all areas of society, bringing great convenience to people's social production and daily lives. With the continuous development of science and technology, high-voltage power supply circuits are widely used in industries such as industry, agriculture, national defense, and medicine. The performance and cost control requirements for high-voltage power supply circuits are also gradually increasing. For example, high-voltage power supply circuits are required to have high stability, high power density, and high reliability. This has led to a gradual increase in the circuit design requirements for high-voltage power supply circuits.

[0003] In the existing technology, two independently working high-voltage power supplies are required to realize the functions of the high-voltage power supply system. The use of two independently working high-voltage power supplies not only makes the reliability and stability of the system weak and the product cost high, but also the utilization rate of the high-voltage power supply is low, resulting in low power density. Summary of the Invention

[0004] In order to solve the above technical problems, the present invention provides an isolated power supply system multiplexing switching circuit and usage method. By adopting this switching circuit, by optimizing the system working timing, two independent power supplies can be reduced to one power supply to meet the needs of the high-voltage power supply system, which not only improves the reliability and stability of the system and reduces product costs, but also improves the power density of the high-voltage power supply.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions:

[0006] An isolated power supply system multiplexing switching circuit includes a power circuit and a control circuit;

[0007] The power circuit is used to realize power conversion and complete power system multiplexing switching;

[0008] The control circuit is used to provide a driving signal for the power circuit;

[0009] The power circuit includes a voltage input terminal, a first voltage output terminal and a second voltage output terminal;

[0010] The first voltage output terminal and the second voltage output terminal are connected in parallel to both ends of the voltage input terminal;

[0011] A diode and a field effect transistor are connected between the first voltage output terminal and the second voltage output terminal, and the diode and the field effect transistor are connected in parallel;

[0012] The source of the field effect tube is connected to the first voltage output terminal, the drain is connected to the second voltage output terminal, and the gate is connected to a driving signal source and a voltage dividing resistor unit;

[0013] The voltage dividing resistor unit is connected to the first voltage output end;

[0014] The control circuit includes a relay, and the relay is connected to the driving signal source.

[0015] Furthermore, the control circuit further includes an operational amplifier;

[0016] One branch of the output end of the operational amplifier is connected to the driving signal source, and the other branch is connected to an impedance network R2;

[0017] One end of the impedance network R2 is connected to the output terminal of the operational amplifier, and the other end is connected in parallel with the impedance network R1. The impedance network R1 and the impedance network R2 are respectively connected to the negative input terminal of the operational amplifier;

[0018] The positive input terminal of the operational amplifier is connected to a reference voltage dividing resistor R5, a reference voltage dividing resistor R6 and a reference voltage dividing resistor R8;

[0019] The reference voltage dividing resistor R6 is connected in series with the reference voltage dividing resistor R8 and is connected in parallel with the reference voltage dividing resistor R5;

[0020] The JZ signal terminal of the relay is connected between the reference voltage-dividing resistor R6 and the reference voltage-dividing resistor R8.

[0021] Furthermore, the impedance network R1 is connected to a voltage feedback Vfb interface.

[0022] Furthermore, the positive electrode of the reference voltage-dividing resistor R8 is connected to 12V, and the negative electrode is grounded.

[0023] Furthermore, the reference voltage-dividing resistor R5 is connected to a gain stage signal Vgd interface.

[0024] Furthermore, the second voltage output terminal is connected to a filter capacitor C2.

[0025] Furthermore, a filter capacitor C1 is connected to the voltage input terminal.

[0026] Furthermore, the voltage-dividing resistor unit includes a voltage-dividing resistor R4 and a voltage-dividing resistor R7, and the gate of the field-effect transistor is connected between the voltage-dividing resistor R4 and the voltage-dividing resistor R7.

[0027] Furthermore, the power circuit is connected to a power ground line.

[0028] A method for using an isolated power system multiplexing switching circuit, based on the above-mentioned isolated power system multiplexing switching circuit, includes:

[0029] The voltage is input from the voltage input terminal, the relay switches the closing instruction, and the field effect tube is turned on; when the power supply system switches the circuit, the relay switches the opening instruction, causing the driving signal in the driving signal source to change, and the field effect tube is turned off, causing the output voltage of the first voltage output terminal and the second voltage output terminal to change, completing the power supply system multiplexing switching.

[0030] Compared with the prior art, the present invention has the following beneficial effects:

[0031] The present invention provides an isolated power supply system multiplexing switching circuit. The circuit is designed with a power circuit and a control circuit, wherein the power circuit includes a voltage input terminal, a first voltage output terminal and a second voltage output terminal, and a diode and a field effect transistor are connected between the first voltage output terminal and the second voltage output terminal. The command output of the relay controls the change of the drive signal, and finally realizes the change of the output voltage, thereby completing the multiplexing switching of the power supply system; the circuit reduces two power supplies to one power supply by adjusting the working timing of the system-level product, thereby improving the reliability of the system, reducing the cost of the product, increasing the utilization rate of the power supply, and increasing the power density of the product. In addition, because the power circuit and the control circuit are combined, the switching circuit has a strong anti-interference ability; the circuit structure and principle are simple, easy to operate and use, strong applicability, and has high promotion and application value.

[0032] Preferably, an operational amplifier is also designed in the control circuit of the present invention, so that the circuit has a signal gain effect.

[0033] Further preferably, the control circuit in the present invention is further provided with a voltage feedback Vfb interface, so that the output voltage can be stabilized, the output resistance can be reduced, and the load driving capacity can be improved.

[0034] Further preferably, the control circuit of the present invention is further provided with a gain stage signal Vgd interface, so that the circuit has a better amplification gain effect.

[0035] Preferably, two filter capacitors are designed in the power circuit of the present invention, so that the switching circuit can reduce the AC ripple coefficient and thus improve the efficient and smooth DC output.

[0036] Preferably, the power circuit of the present invention is connected to a power ground line, thereby improving the safety of the circuit.

[0037] The present invention also provides a method for using an isolated power supply system multiplexing switching circuit. Based on the above-mentioned isolated power supply system multiplexing switching circuit, this method can realize the reuse of high-voltage power supplies in a high-voltage power supply system, thereby improving the reliability and stability of the system, reducing product costs, and improving the power density of the high-voltage power supply. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 A schematic structural diagram of a multiplexing switching circuit for an isolated power supply system provided by an embodiment of the present invention;

[0039] Figure 2 A functional block diagram of a relay switching circuit provided in an embodiment of the present invention;

[0040] Figure 3 The present invention provides a flowchart of a method for using a multiplexing switching circuit in an isolated power supply system. DETAILED DESCRIPTION

[0041] The present invention provides an isolated power supply system multiplexing switching circuit, comprising a power circuit and a control circuit;

[0042] The power circuit is used to realize power conversion and complete power system multiplexing switching;

[0043] The control circuit is used to provide a driving signal for the power circuit;

[0044] Specifically, the power circuit includes a voltage input terminal, a first voltage output terminal, and a second voltage output terminal; the first voltage output terminal and the second voltage output terminal are connected in parallel to both ends of the voltage input terminal; a diode and a field effect transistor are connected between the first voltage output terminal and the second voltage output terminal, and the diode and the field effect transistor are connected in parallel; the source of the field effect transistor is connected to the first voltage output terminal, the drain is connected to the second voltage output terminal, and the gate is connected to a drive signal source and a voltage divider resistor unit; the voltage divider resistor unit is connected to the first voltage output terminal;

[0045] Furthermore, the control circuit includes a relay and an operational amplifier, wherein the relay is connected to the drive signal source. One branch of the output terminal of the operational amplifier is connected to the drive signal source, and the other branch is connected to an impedance network R2. One end of the impedance network R2 is connected to the output terminal of the operational amplifier, and the other end is connected in parallel with an impedance network R1. The impedance networks R1 and R2 are respectively connected to the negative input terminal of the operational amplifier. The positive input terminal of the operational amplifier is connected to reference voltage divider resistors R5, R6, and R8. The reference voltage divider resistor R6 is connected in series with the reference voltage divider resistor R8 and in parallel with the reference voltage divider resistor R5. The JZ signal terminal of the relay is connected between the reference voltage divider resistors R6 and R8.

[0046] Specifically, the impedance network R1 is connected to the voltage feedback Vfb interface; the positive electrode of the reference voltage divider resistor R8 is connected to 12V, and the negative electrode is grounded; the reference voltage divider resistor R5 is connected to the gain stage signal Vgd interface.

[0047] Particularly, the second voltage output terminal is connected to a filter capacitor C2 ; and the voltage input terminal is connected to a filter capacitor C1 .

[0048] Here, the aforementioned voltage-dividing resistor unit includes a voltage-dividing resistor R4 and a voltage-dividing resistor R7, and the gate of the field-effect transistor is connected between the voltage-dividing resistor R4 and the voltage-dividing resistor R7.

[0049] For safety reasons, the power circuit is connected to a power ground wire.

[0050] The present invention also provides a method for using an isolated power supply system multiplexing switching circuit, based on the above-mentioned isolated power supply system multiplexing switching circuit, comprising:

[0051] The voltage is input from the voltage input terminal, the relay switches the closing instruction, and the field effect tube is turned on; when the power supply system switches the circuit, the relay switches the opening instruction, causing the driving signal in the driving signal source to change, and the field effect tube is turned off, causing the output voltage of the first voltage output terminal and the second voltage output terminal to change, completing the power supply system multiplexing switching.

[0052] Example

[0053] This embodiment provides a high voltage power multiplexing circuit, such as Figure 1 As shown: C1 and C2 are capacitors for energy storage filtering, R4 and R7 are voltage divider resistors to ensure the operation of Q1 tube (field effect tube), and Q1 is the control switch mode tube between V1 and V0; Figure 2The relay used here is a magnetic latching relay, which has the following characteristics: even after the product loses power, it can still maintain the switch state of the previous state until the control instruction of another state is issued; Figure 1 As shown, N1 is an operational amplifier, R1 and R2 are impedance networks that realize the operation of the error amplifier, and R5, R6, and R8 are reference voltage divider resistors.

[0054] Specific description: Combined Figure 2 and Figure 3 The initial state of the power supply is that the QHOFF (switching off instruction) of the relay J1 is executed. Figure 1 The Q1 tube is in the open state. Figure 3 The JZ signal of the middle circuit is in a suspended state; when the system needs to switch to work, the QHON (switch on instruction) of the relay J1 is executed. Figure 1 The Q1 tube is in the closed state. Figure 3 The JZ signal in the middle circuit is in a grounded state, and the reference signal sent to the operational amplifier also changes due to the change of the voltage divider resistors (R5, R6, R8).

[0055] That is to say, when the state of relay J1 changes, its JZ signal and A signal (drive signal) will change synchronously. The change of JZ signal will trigger the change of drive signal. After the drive signal changes, the output voltages of V1 and V0 will change, and finally the power system multiplexing switching is completed.

[0056] It's also important to note that relay J1 emphasizes the synchronization of two actions during switching. Action 1 switches the drive signal (the reference voltage signal used to adjust the output voltage); Action 2 switches the output voltage from being simultaneously output on both V1 and V0 to outputting only V1 and not V0. The use of relay J1 here is specifically designed to ensure high synchronization between these two actions. This ensures zero output voltage delay or fluctuation when switching between outputs.

[0057] The above embodiment is only one of the implementation methods that can realize the technical solution of the present invention. The scope of protection claimed by the present invention is not limited only to this embodiment, but also includes changes, replacements and other implementation methods that can be easily thought of by any technician familiar with this technical field within the technical scope disclosed by the present invention.

Claims

1. An isolated power supply system multiplexing switching circuit, characterized in that: Including power circuit and control circuit; The power circuit is used to realize power conversion and complete power system multiplexing switching; The control circuit is used to provide a driving signal for the power circuit; The power circuit includes a voltage input terminal, a first voltage output terminal and a second voltage output terminal; The first voltage output terminal and the second voltage output terminal are connected in parallel to both ends of the voltage input terminal; A diode and a field effect transistor are connected between the first voltage output terminal and the second voltage output terminal, and the diode and the field effect transistor are connected in parallel; The source of the field effect tube is connected to the first voltage output terminal, the drain is connected to the second voltage output terminal, and the gate is connected to a driving signal source and a voltage dividing resistor unit; The voltage dividing resistor unit is connected to the first voltage output end; The control circuit includes a relay, and the relay is connected to the driving signal source; The control circuit further includes an operational amplifier; One branch of the output end of the operational amplifier is connected to the driving signal source, and the other branch is connected to an impedance network R2; One end of the impedance network R2 is connected to the output terminal of the operational amplifier, and the other end is connected in parallel with the impedance network R1. The impedance network R1 and the impedance network R2 are respectively connected to the negative input terminal of the operational amplifier; The positive input terminal of the operational amplifier is connected to a reference voltage dividing resistor R5, a reference voltage dividing resistor R6 and a reference voltage dividing resistor R8; The reference voltage dividing resistor R6 is connected in series with the reference voltage dividing resistor R8 and is connected in parallel with the reference voltage dividing resistor R5; The JZ signal terminal of the relay is connected between the reference voltage-dividing resistor R6 and the reference voltage-dividing resistor R8.

2. The isolated power supply system multiplexing switching circuit according to claim 1, characterized in that: The impedance network R1 is connected to a voltage feedback Vfb interface.

3. The isolated power supply system multiplexing switching circuit according to claim 1, characterized in that: The positive electrode of the reference voltage-dividing resistor R8 is connected to 12V, and the negative electrode is grounded.

4. The isolated power supply system multiplexing switching circuit according to claim 1, characterized in that: The reference voltage dividing resistor R5 is connected to the gain stage signal Vgd interface.

5. The isolated power supply system multiplexing switching circuit according to claim 1, characterized in that: The second voltage output terminal is connected to a filter capacitor C2.

6. The isolated power supply system multiplexing switching circuit according to claim 1, characterized in that: The voltage input terminal is connected to a filter capacitor C1.

7. The isolated power supply system multiplexing switching circuit according to claim 1, characterized in that: The voltage-dividing resistor unit includes a voltage-dividing resistor R4 and a voltage-dividing resistor R7, and the gate of the field-effect transistor is connected between the voltage-dividing resistor R4 and the voltage-dividing resistor R7.

8. The isolated power supply system multiplexing switching circuit according to claim 1, characterized in that: The power circuit is connected to a power ground line.

9. A method for using an isolated power system multiplexing switching circuit, based on the isolated power system multiplexing switching circuit according to any one of claims 1 to 8, characterized in that: include: Input voltage from the voltage input terminal, the relay switches to the closed instruction, and the field effect tube is turned on; When the power supply system switches the circuit, the relay switches on the instruction, causing the drive signal in the drive signal source to change, and the field effect transistor is turned off, causing the output voltage of the first voltage output terminal and the second voltage output terminal to change, completing the power supply system multiplexing switching.

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