CN219611613U - Switching tube rectifying circuit - Google Patents

Abstract

The embodiment of the utility model provides a switching tube rectifying circuit which comprises a first rectifying device, a second rectifying device, a third rectifying device, a fourth rectifying device, a first power line, a second power line, a first output end, a second output end and a driving unit; at least one of the first rectifying device, the second rectifying device, the third rectifying device and the fourth rectifying device is a controllable switch tube, the controllable switch tube further comprises a control end, at least one end of the driving unit is electrically connected with the control end of the controllable switch tube, and the other end of the driving unit is electrically connected with the power supply end. The switching tube rectifying circuit has high efficiency.

Description

Switching tube rectifying circuit

[ field of technology ]

The utility model relates to the technical field of electric control, in particular to a switching tube rectifying circuit.

[ background Art ]

The input end of the AC/DC power supply is connected to a power grid, and is rectified by adopting a rectifying circuit, and then power conversion is carried out; in addition, the polarity of the direct current input power supply is not limited to be connected, and the polarity is rectified by a rectifying circuit and then the power is converted.

The rectifying circuit is usually composed of 4 diodes, and has the advantages of simple and reliable structure, low efficiency and large heat generation.

[ utility model ]

Therefore, the embodiment of the utility model provides a switching tube rectifying circuit, at least one of which is a controllable switching tube, and the switching tube rectifying circuit has the advantage of high efficiency.

In order to solve the technical problems, the utility model adopts the following technical scheme:

a switching tube rectifying circuit comprises a first rectifying device, a second rectifying device, a third rectifying device, a fourth rectifying device, a first power line, a second power line, a first output end, a second output end and a driving unit; the first end of the first rectifying device is electrically connected with the first power line, and the second end of the first rectifying device is electrically connected with the first output end; the first end of the second rectifying device is electrically connected with the second power line, and the second end of the second rectifying device is electrically connected with the first output end; the first end of the third rectifying device is electrically connected with the first power line, and the second end of the third rectifying device is electrically connected with the second output end; the first end of the fourth rectifying device is electrically connected with the second power line, and the second end of the fourth rectifying device is electrically connected with the second output end;

at least one of the first rectifying device, the second rectifying device, the third rectifying device and the fourth rectifying device is a controllable switch tube, the controllable switch tube further comprises a control end, at least one end of the driving unit is electrically connected with the control end of the controllable switch tube, the other end of the driving unit is electrically connected with the power supply end, and the driving unit is used for driving the controllable switch tube.

At least one rectifying device of the switching tube rectifying circuit is a controllable switching tube, and the controllable switching tube can be controlled by a driving unit and has the advantage of high efficiency.

[ description of the drawings ]

In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the drawings that are needed in the embodiments will be briefly described below, it will be obvious that the drawings in the following description are only some embodiments of the present utility model, and other drawings can be obtained according to these drawings without inventive effort for a person skilled in the art, but shall fall within the scope of protection of the present utility model.

FIG. 1 is a schematic block diagram of a switching tube rectifying circuit provided by the utility model;

fig. 2 is a schematic diagram of a switching tube rectifying circuit with a controllable switching tube as a lower tube according to a first embodiment of the present utility model;

fig. 3 is a schematic diagram of a switching tube rectifying circuit in which two lower tubes are controllable switching tubes according to a first embodiment of the present utility model;

fig. 4 is a schematic diagram of a switching tube rectifying circuit in which two lower tubes are controllable switching tubes according to another embodiment of the present utility model;

fig. 5 is a schematic diagram of a switching tube rectifying circuit in which two lower tubes are controllable switching tubes according to another embodiment of the present utility model;

Fig. 6 is a schematic diagram of a switching tube rectifying circuit in which two lower tubes are controllable switching tubes according to another embodiment of the present utility model;

fig. 7 is a schematic diagram of a switching tube rectifying circuit with a controllable switching tube as a lower tube according to the first embodiment of the present utility model;

fig. 8 is a schematic diagram of a switching tube rectifying circuit with two lower tubes being controllable switching tubes according to the first embodiment of the present utility model;

fig. 9 is a schematic diagram of a switching tube rectifying circuit with a lower tube being a controllable switching tube according to a second embodiment of the present utility model;

fig. 10 is a schematic diagram of a switching tube rectifying circuit in which two lower tubes are controllable switching tubes according to a second embodiment of the present utility model;

FIG. 11 is a schematic diagram of a switching tube rectifying circuit with a lower tube and an upper tube being controllable switching tubes according to a second embodiment of the present utility model;

fig. 12 is a schematic diagram of a switching tube rectifying circuit for full-bridge synchronous rectification according to a second embodiment of the present utility model;

fig. 13 is a schematic diagram of a switching tube rectifying circuit with a controllable switching tube as a lower tube according to a third embodiment of the present utility model;

fig. 14 is a schematic diagram of a switching tube rectifying circuit in which two lower tubes are controllable switching tubes according to a third embodiment of the present utility model;

Fig. 15 is a schematic diagram of a switching tube rectifying circuit in which two lower tubes are controllable switching tubes according to a third embodiment of the present utility model;

fig. 16 is a schematic diagram of a switching tube rectifying circuit in which two lower tubes are controllable switching tubes according to another embodiment of the present utility model;

FIG. 17 is a schematic diagram of a switching tube rectifying circuit with a controllable switching tube as an upper tube according to a third embodiment of the present utility model;

FIG. 18 is a schematic diagram of a switching tube rectifying circuit with an upper tube and a lower tube as controllable switching tubes according to a third embodiment of the present utility model;

fig. 19 is a schematic diagram of a switching tube rectifying circuit for full-bridge synchronous rectification according to a third embodiment of the present utility model;

fig. 20 is a schematic diagram of a switching tube rectifying circuit for full-bridge synchronous rectification according to a third embodiment of the present utility model.

[ detailed description ] of the utility model

For a better understanding of the technical solution of the present utility model, the following detailed description of the embodiments of the present utility model refers to the accompanying drawings.

It should be understood that the described embodiments are merely some, but not all, embodiments of the utility model. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

The terminology used in the embodiments of the utility model is for the purpose of describing particular embodiments only and is not intended to be limiting of the utility model. As used in this application and the appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. Electrical connections include direct electrical connections and indirect electrical connections.

It should be understood that the term "and/or" as used herein is merely one way of describing an association of associated objects, meaning that there may be three relationships, e.g., a and/or b, which may represent: the first and second cases exist separately, and the first and second cases exist separately. In addition, the character "/" herein generally indicates that the front and rear associated objects are an "or" relationship.

The rectifying circuit is widely applied to various alternating current input occasions needing rectification, and can be applied to a direct current input power supply to realize foolproof plug-in connection; a general rectifying circuit is composed of 4 diodes, but a rectifying circuit composed of 4 diodes is inefficient. In order to improve the efficiency of the rectifying circuit, a synchronous rectifying technology using a controllable switching tube to replace a diode is used; however, how to control the controllable switching tube in the rectifying circuit is a technical problem to be solved.

Based on this, the present application provides a switching tube rectifying circuit, as shown in fig. 1, comprising a first rectifying device 11, a second rectifying device 12, a third rectifying device 13, a fourth rectifying device 14, a first power line L1, a second power line L2, a first output terminal vout+, a second output terminal Vout-, and a driving unit 21; the first end of the first rectifying device 11 is electrically connected with the first power line L1, and the second end of the first rectifying device 11 is electrically connected with the first output end Vout+; the first end of the second rectifying device 12 is electrically connected with the second power line L2, and the second end of the second rectifying device 12 is electrically connected with the first output end Vout+; the first end of the third rectifying device 13 is electrically connected with the first power line L1, and the second end of the third rectifying device 13 is electrically connected with the second output end Vout; the first end of the fourth rectifying device 14 is electrically connected with the second power line L2, and the second end of the fourth rectifying device 14 is electrically connected with the second output end Vout;

wherein the first rectifying device 11, the second rectifying device 12, the third rectifying device 13 and the fourth rectifying device 14 constitute a rectifying circuit; at least one of the first rectifying device 11, the second rectifying device 12, the third rectifying device 13 and the fourth rectifying device 14 is a controllable switch tube, and the controllable switch tube comprises a control end besides a first end and a second end which are connected with a power line (L1/L2) and an output end (Vout+/Vout-); the controllable switching tube is controlled by a driving unit 21, specifically, at least one end of the driving unit 21 is electrically connected with a control end of the controllable switching tube, the other end is electrically connected with a power supply end VS, and the driving unit 21 is used for driving the controllable switching tube. The power supply terminal VS may be an external power supply terminal VCC or a reference voltage terminal generated by other circuits, or may be directly the first power line L1 or the second power line L2, or of course, may also be the first output terminal vout+, where the power supply terminal may be capable of providing a driving capability or a driving signal for driving the controllable switch tube for the driving unit.

For convenience of description, the first rectifying device 11 and the second rectifying device 12 are also referred to as upper pipes, and the third rectifying device 13 and the fourth rectifying device 14 are referred to as lower pipes. The first rectifying device 11 and the second rectifying device 12 are of symmetrical structure, and the driving units thereof are similar in design, while the third rectifying device 13 and the fourth rectifying device 14 are of symmetrical structure, and the driving units thereof are similar in design.

In order to realize the control of the controllable switching tube in the switching tube rectifying circuit, at least three control embodiments are provided in the application, and the control embodiments are respectively described below.

Schematic diagrams of the switching tube rectifying circuit provided in the first embodiment are shown in fig. 2-8;

in one example, as shown in fig. 2, the fourth rectifying device 14 is a controllable switching tube Q21, and the driving unit is shown in an icon 211, and in order to drive the controllable switching tube Q21, the driving unit 211 includes a resistor R21 and a diode D21 connected in series; the cathode of the diode D21 is electrically connected to the first power line L1, the first end of the resistor R21 is electrically connected to the power supply terminal VCC, and the common terminal of the resistor R21 and the diode D21 is electrically connected to the control terminal of the controllable switching transistor Q21. In fig. 2, the other rectifying device is still a diode, and the controllable switch Q21 is an N-mos transistor with a positive voltage driving conduction of a body diode; specifically, the first end of the fourth rectifying device 14 is the drain (D) of the controllable switch Q21, the second end is the source (S) of the controllable switch Q21, and the control end of the controllable switch Q21 is the gate (G) thereof.

In the example, a diode D21 is used for forming a discharge channel for the gate electrode of the controllable switch tube Q21; and the resistor R21 and the power supply end VCC form a charging channel of the gate electrode of the controllable switch tube Q21, and synchronous rectification control is carried out on the controllable switch tube Q21. Specifically, when L1 is high and L2 is low, the diode D21 is turned off, VCC charges the gate of the controllable switch Q21 through the resistor R21 until the GS voltage (positive voltage) of Q21 is greater than the turn-on threshold (positive value), Q21 is turned on, and l1→d1→vout+ →vout→q21→l2 forms a current loop; the body diode of the Q21 is used for rectification before the Q21 is conducted, so that rectification continuity can be ensured, and the stability and safety of the circuit can be improved. When L1 is low potential and L2 is high potential, the gate electrode of the controllable switch tube Q21 rapidly discharges to L1 through the diode D21, the gate electrode signal of the Q21 is pulled down, the GS voltage of the Q21 is smaller than the conducting threshold value of the Q21, the Q21 is cut off, and a current loop is formed by L2→D2→Vout+ →Vout→D3→L1; the gate electrode of the Q21 can discharge to the L1 directly through the D21, so that the quick cut-off of the Q21 is realized, and the L2 is prevented from being communicated with Vout, so that circuit faults are caused. The driving unit 211 has simple circuit structure and low cost; in addition, since the driving signal of the controllable switch Q21 is a power frequency signal, the resistor R21 can take a larger value, so that when the diode D21 is pulled down, the loss of the resistor R21 is relatively smaller, that is, the operation loss of the driving unit 211 is smaller, which is beneficial to further improving the rectifying efficiency.

In another example, the third rectifying device 13 may be provided as a controllable switching tube Q22; as shown in fig. 3, in order to drive the controllable switching transistor Q22, the driving unit 211 includes at least a resistor R22 and a diode D22 connected in series; the cathode of the diode D22 is electrically connected to the second power line L2, the first end of the resistor R22 is electrically connected to the power supply terminal VCC, and the common terminal of the resistor R22 and the diode D22 is electrically connected to the control terminal of the controllable switching transistor Q22. The other rectifying devices can be diodes or controllable switching tubes, and the controllable switching tube Q22 is an N-mos tube with a body diode; specifically, the first end of the third rectifying device 14 is the drain (D) of the controllable switch Q22, the second end is the source (S) of the controllable switch Q22, and the control end of the controllable switch Q22 is the gate (G) thereof.

In the example, a diode D22 is used for forming a discharge channel for the gate electrode of the controllable switch tube Q22; and the resistor R22 and the power supply end VCC form a charging channel of the gate electrode of the controllable switch tube Q22, and synchronous rectification control is carried out on the controllable switch tube Q22. Specifically, when L2 is high potential and L1 is low potential, the diode D22 is turned off, VCC charges the gate of the controllable switch tube Q22 through the resistor R22 until the Q22 is turned on, and the current loop is formed by L2→D2→Vout+ →Vout→Q22→L1; the body diode of the Q22 is used for rectification before the Q22 is conducted, so that rectification continuity can be ensured, and the stability and safety of the circuit can be improved. When L2 is low potential and L1 is high potential, the gate electrode of the controllable switch tube Q22 discharges rapidly to L2 through the diode D22, the gate electrode signal of the Q22 is pulled low, the Q22 is cut off, and the current loop is formed by L1→D1→Vout+ →Vout→the fourth rectifying device 14→L2; the gate electrode of the Q22 can discharge to the L2 directly through the D22, so that the quick cut-off of the Q22 is realized, and the circuit fault caused by the connection between the L1 and the Vout is prevented. The driving unit 211 has simple circuit structure and low cost; in addition, since the driving signal of the controllable switch Q22 is a power frequency signal, the resistor R22 can take a larger value, so that when the diode D22 is pulled down, the loss of the resistor R22 is relatively smaller, that is, the operation loss of the driving unit 211 is smaller, which is beneficial to further improving the rectifying efficiency. In fig. 3, the fourth rectifying device 14 is a controllable switch Q21, and the working principle thereof has been described in the previous example, and will not be described herein.

In the above example, the controllable switch transistors Q21/Q22 may also be other electronic switches, such as transistors, IGBTs (Insulated Gate Bipolar Transistor: insulated gate bipolar transistors), JFETs (Junction Field-Effect Transistor: junction Field effect transistors), silicon carbide MOS transistors, etc.; preferably, if the other electronic switch does not have a body diode, a diode can be connected in parallel with the other electronic switch to further improve rectification safety and circuit stability, and the electronic switch is preferably a switching tube of the same type as an N-mos tube, such as a switching tube driven to be conducted by a positive voltage/high level.

Further, in one example, as shown in fig. 4, the driving unit 211 further includes a capacitor C21 and/or a capacitor C22; the capacitor C21 is connected between the control second output end Vout of the controllable switch tube Q21; the capacitor C22 is connected between the controllable switch tube Q22 and the second output end Vout 1; the power supply terminal is the first output terminal vout+ or the external power supply terminal VCC (fig. 4 is taken as an example of the external power supply terminal VCC). The controllable switch Q22, the capacitor C22, the resistor R22 and the diode D22 may be simultaneously provided, that is, in this example, when the third rectifying device is the controllable switch Q22, the driving unit 211 includes at least the capacitor C22, the resistor R22 and the diode D22; and when the fourth rectifying device is the controllable switch Q21, the driving unit 211 includes at least a capacitor C21, a resistor R21 and a diode D21. The capacitor C21 can reduce the opening speed of the driving controllable switch tube Q21 or delay the opening time of the driving controllable switch tube Q21, so that the anti-interference effect of the controllable switch tube Q21 is improved; similarly, the capacitor C22 can reduce the turn-on speed of the driving controllable switch Q22 or delay the turn-on time thereof, thereby improving the anti-interference effect of the controllable switch Q22.

Further, in one example, as shown in fig. 5, the setting driving unit 211 further includes a regulator tube ZD21 and/or a regulator tube ZD22. The voltage stabilizing tube ZD21 is connected between the control end of the controllable switch tube Q21 and the second output end Vout-; the voltage stabilizing tube ZD22 is connected between the controllable switch tube Q22 and the second output end Vout-; the power supply end is a first output end Vout+ or an external power supply end VCC. The voltage stabilizing tube can be used for realizing the adaptation of voltage or protecting the corresponding controllable switching tube, thereby being beneficial to improving the control safety. In the example of fig. 5, the power supply terminal of the driving unit is the first output terminal vout+.

Further, as shown in fig. 6, the voltage stabilizing tube ZD21 and the capacitor C21 may be simultaneously set, and the voltage stabilizing tube ZD22 and the capacitor C22 may also be simultaneously set, so as to optimize the control design and improve the anti-interference effect and the circuit safety.

In the above example, when the diode D21 is pulled down, the resistor R21 is connected in series to the power supply terminal and the first power line L1, which causes a loss. Based on this, this embodiment further proposes an example, as shown in fig. 7, taking the fourth rectifying device as the controllable switching tube Q21 as an example, the driving unit is shown in an icon 212, and the driving unit 212 includes a resistor R21, a diode D21, a switching tube Q211, a resistor R22, and a diode D22; after being connected in series, the resistor R21, the diode D21 and the switching tube Q211 are connected between the power supply end VCC and the first power line L1, and the cathode of the diode D21 is electrically connected with the first power line L1; the anode of the diode D21 is electrically connected with the control end of the controllable switch tube Q21; the resistor R22 and the diode D22 are connected in series and then connected between the power supply terminal VCC and the second power supply line L2, the cathode of the diode D22 is electrically connected to the second power supply line L2, and the anode of the diode D22 is electrically connected to the control terminal of the switching transistor Q211. The switch Q211 may be a P-MOS transistor, or may be any other low-level/negative-voltage driven electronic switch, such as a PNP transistor, for example.

In this example, when L1 is high and L2 is low, D21 is turned off, D22 is pulled low, the gate voltage of Q211 is also pulled low, Q211 is turned on, VCC charges the gate of Q21 through resistors R21 and Q211, and turns on Q21, thereby forming a current path of l1→d1→vout+ →vout→q21→l2; when L1 is low potential and L2 is high potential, D21 is pulled down, D22 is cut off, Q211 gate presents high potential, Q211 is cut off, resistor R1 is not connected between power supply VCC and L1, and R1 current is 0, so that loss of R1 is reduced, and rectifying efficiency is further improved. Of course, the R21 and Q211 positions may be interchanged. Further, as shown in fig. 8, when the third rectifying device is also a controllable switch Q22; the setting driving unit also comprises a switching tube Q221; the switching tube Q221 is connected in series with the resistor R22 and the diode D22 and then is connected between the power supply end VCC and the second power line L2; the anode of the diode D22 is electrically connected with the control end of the switching tube Q22; the anode of the diode D21 is also electrically connected to the control terminal of the switching tube Q221.

Similarly, in this example, when L2 is high and L1 is low, D21 is pulled low and Q221 is turned on; d22 is cut off, Q211 is cut off, the loss of the resistor R21 is 0, Q22 is turned on, and a current path from l2→d2→vout+ →vout→q22→l1 is formed; when L2 is low and L1 is high, D22 is pulled down, and Q211 is turned on; d21 is turned off, Q221 is turned off, resistor R22 is worn to 0, Q21 is turned on, and a current path of l1→d1→vout+ →vout→q21→l2 is formed.

In the example of adding the switching transistors Q211 and/or Q221, Q211 and/or Q221 can be turned on or off by a circuit design, so that the loss of the driving unit is extremely low, about 0, when driving is not required, thereby further improving the circuit efficiency.

The schematic diagrams of the switching tube rectifying circuit provided by the second embodiment are shown in fig. 9-12;

the driving unit exemplified by the second embodiment is different from the driving unit exemplified by the first embodiment;

as shown in fig. 9, in one example, if the third rectifying device 13 is a controllable switch Q22; the driving unit includes a first driving unit, as shown in an icon 213, and the first driving unit 213 includes a diode D31, a resistor R31, and a regulator tube ZD31; the resistor R31 is connected in parallel with the diode D31, the cathode of the diode D31 is electrically connected with the second power line L2, and the anode of the diode D31 is electrically connected with the control end of the controllable switch tube Q22; the voltage stabilizing tube ZD31 is connected in parallel between the control end of the controllable switch tube Q22 and the second output end Vout-, and the cathode of the voltage stabilizing tube ZD31 is electrically connected with the control end of the controllable switch tube Q22;

in this example, D31 and R31 are connected in parallel between the gate of Q22 and the second power line L2, and Q22 synchronous rectification control is performed as a driving means of Q22. If the voltage of the second power line L2 is higher than the voltage tolerance capability of the Q22 control terminal, the voltage regulator clamp and the voltage regulator ZD31 can be connected in parallel to ground at the Q22 control terminal. If the voltage of the second power line L2 is not higher than the voltage tolerance capability of the control terminal of Q22, the regulator ZD31 may not be provided to reduce the driving loss of Q22.

Referring to fig. 9, the specific working principle is that when L2 is high potential and L1 is low potential, the diode D31 is turned off, the second power line charges the gate of the controllable switch Q22 through the resistor R31 until Q22 is turned on, and the current loop is formed by l2→d2→vout+ →vout→q22→l1; the body diode of the Q22 is used for rectification before the Q22 is conducted, so that rectification continuity can be ensured, and the stability and safety of the circuit can be improved. When L2 is low and L1 is high, the diode D31 is pulled low, the gate electrode of the controllable switch tube Q22 discharges to L2 through the diode D31, the gate electrode signal of the controllable switch tube Q22 is pulled low, the Q22 is cut off, and a current loop is formed by L1- & gtD1- & gtVout+ & gtVout- & gtD4- & gtL 2;

the first driving unit 213 has a simple circuit structure and low cost, and can achieve the purposes of reducing loss and improving circuit efficiency.

Referring to fig. 10, if the fourth rectifying device 14 is a controllable switch Q21, the first driving unit 213 includes at least a resistor R32, a diode D32, and a voltage regulator ZD32; the resistor R32 is connected in parallel with the diode D32, the cathode of the diode D32 is electrically connected with the first power line L1, and the anode of the diode D32 is electrically connected with the control end of the controllable switch tube Q21; the voltage stabilizing tube ZD32 is connected in parallel between the control end and the second output end of the controllable switch tube Q21, and the cathode of the voltage stabilizing tube ZD32 is electrically connected with the control end of the controllable switch tube Q21.

Similarly, in this example, D32 and R32 are connected in parallel between the gate of Q21 and the first power line L1, and Q21 synchronous rectification control is performed as a driving means of Q21. If the voltage of the first power line L1 is higher than the voltage tolerance capability of the Q21 control terminal, the voltage regulator ZD32 may be clamped at the Q21 control terminal. If the voltage of the first power line L1 is not higher than the voltage tolerance capability of the control terminal of Q21, the regulator ZD32 may not be provided to reduce the driving loss of Q21.

Referring to fig. 10, the principle of the third rectifying device 13 and the fourth rectifying device 14 being controllable switching transistors will be described:

when L2 is high potential and L1 is low potential, the diode D31 is cut off, the second power line charges the gate electrode of the controllable switch tube Q22 through the resistor R31 until the gate electrode of the controllable switch tube Q22 is turned on, and the current loop is formed by L2- & gtD 2- & gtVout- & gtQ22- & gtL 1; while diode D32 is pulled low and Q21 is off; the body diode of the Q22 is used for rectification before the Q22 is conducted, so that rectification continuity can be ensured, and the stability and safety of the circuit can be improved. When L2 is low and L1 is high, the diode D31 is pulled low, the gate electrode of the controllable switch tube Q22 discharges to L2 through the diode D31, the gate electrode signal of the Q22 is pulled low, and the Q22 is cut off; the diode D32 is cut off, and the first power line L1 charges the gate electrode of the controllable switch tube Q21 through the resistor R32 until the Q21 is conducted, and a current loop is formed by L1→D1→Vout+ →Vout→Q21→L2; the body diode of the Q21 is used for rectification before the Q21 is conducted, so that rectification continuity can be ensured, and the stability and safety of the circuit can be improved.

The first driving unit 213 has a simple circuit structure and low cost, and can achieve the purposes of reducing loss and improving circuit efficiency.

Further, in order to set the upper tube as a controllable switch tube, the embodiment of the application also provides a switch tube rectifying circuit, as shown in fig. 11, wherein the first rectifying device is a controllable switch tube Q23; the driving unit as shown in the icon 214, the driving unit 214 includes a diode D33, a resistor R33, and a regulator tube ZD33; the resistor R33 is connected in parallel with the diode D33, the cathode of the diode D33 is electrically connected with the control end of the controllable switch tube Q23, and the anode of the diode D33 is electrically connected with the second power line L2; the voltage stabilizing tube ZD33 is connected in parallel between the control end of the controllable switch tube Q23 and the first output end Vout+, and the anode of the voltage stabilizing tube ZD33 is electrically connected with the control end of the controllable switch tube Q23; the controllable switch Q23 is a negative voltage/low level conductive electronic switch, such as a negative voltage driven conductive P-MOS transistor. Taking Q23 as an enhanced P-MOS as an example, the S electrode of the Q23 is electrically connected with the first output end Vout+, the D electrode of the Q23 is electrically connected with the first power line L1, and when the GS bearing negative pressure is lower than a certain value (the conduction threshold value), the Q23 is conducted; when the GS withstand negative pressure is higher than a certain value (its on threshold), Q23 is turned off. Taking the conduction threshold value of-1V as an example, if the GS voltage is equal to-5V, the conduction threshold value is lower than the conduction threshold value of-1V, and Q23 is conducted; if the GS voltage is-0.5V or 0, the threshold is higher than-1V, and Q23 is cut off. At this time, Q23 is an electronic switch that is driven on by a negative voltage.

In this example, if L1 is at a high level and L2 is at a low level, the voltage regulator ZD33 and the resistor R33 divide the voltage between vout+ and the second power line L2, and if L2 is at a low level, the voltage regulator ZD33 has a low anode voltage, and the GS voltage of Q23 is a negative voltage lower than the turn-on threshold, the controllable switching transistor Q23 is turned on, so as to form a current loop of l1→q23→vout+ →vout→fourth rectifying device 14→l2; and diode D31 is pulled low and switching tube Q22 is turned off. If L1 is low level and L2 is high level, then the voltage regulator ZD33 and the resistor R33 divide the voltage between the second power line L2 and vout+, the positive voltage of ZD33 is slightly higher than the negative voltage thereof, the GS voltage of Q23 is higher than the negative voltage of the on threshold thereof, and the controllable switch Q23 is turned off; the second power line L2 drives the controllable switch Q22 through the resistor R31, so that the controllable switch Q22 is conducted to form a current loop of L2→D2→Vout+ →Vout→Q22→L1.

Of course, the upper tube-second rectifying device 12 may also be a controllable switch tube Q24; at this time, as shown in fig. 12, the driving unit 214 includes at least a diode D34, a resistor R34, and a regulator ZD34; the resistor R34 is connected in parallel with the diode D34, the cathode of the diode D34 is electrically connected with the control end of the controllable switch tube Q24, and the anode of the diode D34 is electrically connected with the first power line L1; the voltage stabilizing tube ZD34 is connected in parallel between the control end of the controllable switch tube Q24 and the first output end Vout+, and the anode of the voltage stabilizing tube ZD34 is electrically connected with the control end of the controllable switch tube Q24. In the example, the voltage is divided by using a voltage stabilizing tube ZD34 and a resistor R34 which are connected in series, so that a negative voltage/positive voltage which is smaller than the conduction threshold value or a smaller negative voltage which is higher than the conduction threshold value of the driving Q24 is obtained, and the conduction/disconnection of the Q24 is controlled; the principle is the same as the control principle of Q23, and will not be described here again.

It should be noted that the controllable switch tube of the upper tube may be selected as a negative voltage/low level driving conductive electronic switch, such as a P-MOS tube with a body diode; of course, other negative voltage/low level driven on electronic switches are also possible. If the other negative voltage/low level driven electronic switch does not have a body diode, a diode can be connected in parallel with the other negative voltage/low level driven electronic switch to further rectify the safety and circuit stability. The first rectifying device 11 to the second rectifying device 14 may be partially controllable switching transistors, as shown in fig. 9 to 11; all the switching tubes can be controllable, and as shown in fig. 12, the switching tube rectifying circuit is a full-bridge synchronous rectifying circuit.

The schematic diagrams of the switching tube rectifying circuit provided by the third embodiment are shown in fig. 13-20;

unlike the examples of the driving units provided by the first and second embodiments, the driving unit of the controllable switching tube of the switching tube rectifying circuit provided by the third embodiment is realized by another controllable switching tube.

As shown in fig. 13, the third rectifying device 13 is a controllable switch Q22, and the driving unit includes a second driving unit, which is shown in an icon 215 and at least includes a controllable switch Q31; the first end of the controllable switch Q31 is electrically connected to the second power line L2, the second end of the controllable switch Q31 is electrically connected to the control end of the controllable switch Q22, the control end of the controllable switch Q31 is electrically connected to the first reference voltage terminal Vref1, and the first reference voltage terminal Vref1 is used for providing a driving signal of Q31. When L1 is high level and L2 is low level, the controllable switch tube Q31 controls Q22 to be cut off; and when L1 is low and L2 is high, the controllable switch tube Q31 controls Q22 to be conducted. Referring to fig. 13, a principle is illustrated by taking a controllable switch Q31 as an N-MOS, where Q31 is connected to a Q22 control terminal, and a second power line L2 and a first reference voltage terminal Vref1 are used as a Q22 gate charging channel to perform Q22 synchronous rectification control. When L1 is low level and L2 is high level, L2 supplies power to the control end of Q22 through Q31, Q22 is conducted, when the voltage of the control end of Q22 rises until VCC-Vth_Q31, Q31 is cut off, but Q22 is still conducted, and a current loop of L2→D2→Vout+ →Vout→Q22→L1 is formed; when L1 is high level and L2 is low level, the control end of Q22 discharges through Q31, the voltage of the driving end of Q22 is reduced, Q31 is recovered to be conducted, the impedance of a Q22 discharge channel is small, the discharge effect is good, the quick cut-off of Q22 at the stage is facilitated, the safety is improved, and a current loop from L1→the first rectifying device 11 (D1) →Vout+ →Vout→the fourth rectifying device 14 (D4) →L2 is formed at the stage.

In this example, the second driving unit 215 has a simple circuit structure and low cost; no extra driving power consumption, namely when the voltage at the driving end of the Q22 finishes charging (the voltage rises to Vref-Vth_Q2), the Q31 does not generate extra current any more, and extra loss is avoided; and the driving pull-down is ideal, namely Q31 works in a synchronous rectification mode as a discharge channel at the driving end of Q22.

Similarly, as shown in fig. 14, the fourth rectifying device 14 may be provided as a controllable switch Q21; at this time, in order to drive the controllable switch Q21, the second driving unit 215 includes at least a controllable switch Q32, a first end of the controllable switch Q32 is electrically connected to the first power line L1, a second end of the controllable switch Q32 is electrically connected to a control end of the controllable switch Q21, and a control end of the controllable switch Q32 is electrically connected to the first reference voltage terminal Vref 1. Alternatively, the controllable switch Q32 may be an N-MOS. It should be noted that Q31 and Q32 may be replaced by other electronic switches, which is not limited in the present application.

Based on the above example, in order to improve the anti-interference effect, it may be achieved by reducing the driving turn-on speed of the rectifying device or delaying the turn-on time thereof. As shown in fig. 15/16, an RC circuit or a voltage regulator may be added to the open charging path of the second driving unit 215;

Specifically, as shown in fig. 15, the second driving unit 215 is provided to further include a first delay circuit and/or a second delay circuit; the turn-on speed of Q22 can be reduced or the turn-on time of the Q22 can be delayed by increasing the first delay circuit, and the turn-on speed of Q21 can be reduced or the turn-on time of the Q21 can be delayed by increasing the second delay circuit, so that the circuit safety is improved.

The first delay circuit comprises a resistor R41, a diode D41 and a capacitor C41; the cathode of the diode D41 is electrically connected with the second power line L2, and the anode of the diode D41 is electrically connected with the control end of the controllable switch tube Q22; the first end of the controllable switch tube Q31 is electrically connected with the second power line L2 through a resistor R41, and the second end of the controllable switch tube Q31 is electrically connected with the second output end Vout through a capacitor C41. The diode D41 may also be connected in parallel with the resistor R41, i.e. the anode of the diode D41 is electrically connected to the first terminal of the controllable switching tube Q31.

The second delay circuit comprises a resistor R42, a diode D42 and a capacitor C42; the cathode of the diode D42 is electrically connected with the first power line L1, and the anode of the diode D42 is electrically connected with the control end of the controllable switch tube Q21; the first end of the controllable switch tube Q32 is electrically connected with the first power line L1 through a resistor R42, and the second end of the controllable switch tube Q32 is electrically connected with the second output end Vout-through a capacitor C42. The diode D42 may also be connected in parallel with the resistor R42, i.e. the anode of the diode D42 is electrically connected to the first terminal of the controllable switch Q32.

As shown in fig. 16, the set driving unit further includes a regulator tube ZD41 and/or a regulator tube ZD42; the voltage stabilizing tube ZD41 is used for reducing the turn-on speed of Q22 or delaying the turn-on time thereof, and the voltage stabilizing tube ZD42 is used for reducing the turn-on speed of Q21 or delaying the turn-on time thereof, so as to improve the circuit safety.

The cathode of the voltage stabilizing tube ZD41 is electrically connected with the second power line L2, and the anode of the voltage stabilizing tube ZD41 is electrically connected with the first end of the controllable switch tube Q31; the cathode of the voltage stabilizing tube ZD42 is electrically connected with the first power line L1, and the anode of the voltage stabilizing tube ZD42 is electrically connected with the first end of the controllable switch tube Q32.

Further, the present embodiment also provides an exemplary switching tube rectifying circuit, as shown in fig. 17, in which the upper tube-first rectifying device 11 is a controllable switching tube Q23; the driving unit 216 includes a controllable switching transistor Q41; the first end of the controllable switch tube Q41 is electrically connected with the control end of the controllable switch tube Q23, and the second end of the controllable switch tube Q41 is electrically connected with the second power line L2; the control end of the controllable switch tube Q41 is electrically connected with a second reference voltage end Vref 2;

in this example, the upper tube is controlled by MOS synchronous rectification, and both Q23 and Q41 use P-MOS. When L1 is high and L2 is low, L2 is pulled down to the control end of Q23 through Q41, Q23 is conducted, when the GS voltage of Q41 drops to (Vref+Vth_Q41), Q41 is cut off, but Q23 is still conducted, and a current loop of L1- & gtQ23- & gtVout+ & gtVout- & gtfourth rectifying device 14 (D4) & gtL 2 is formed; when L1 is low level and L2 is high level, L2 is pulled up to the control end of Q23 through Q41, the voltage of the control end of Q23 approaches 0, Q41 is kept on, the impedance of the negative discharge channel of Q23 is small, and the discharge effect is good.

As shown in fig. 19, the upper tube-second rectifying device 12 may be further provided as a controllable switching tube Q24; at this time, in order to drive the controllable switching transistor Q24, the driving unit 216 includes at least the controllable switching transistor Q42; the first end of the controllable switch tube Q42 is electrically connected with the control end of the controllable switch tube Q24, and the second end of the controllable switch tube Q42 is electrically connected with the first power line L1; the control end of the controllable switch tube Q42 is electrically connected with a second reference voltage end Vref 2; the driving principle of the second rectifying device 12 when it is a controllable switch Q24 is the same as Q23, and will not be described herein.

In the same way as the controllable switch tube used as the upper tube in the second embodiment, the controllable switch tubes Q23 and Q24 used as the upper tube in the present embodiment may also be selected as negative voltage/low level driven electronic switches, such as P-MOS tubes with body diodes; of course, other negative voltage/low level driven on electronic switches are also possible. If the electronic switch of other negative voltage/low level driving conduction does not have a body diode, a diode can be connected in parallel with the electronic switch, so that the rectifying safety and the circuit stability are further improved. The switching transistors Q41 and Q42 for controlling the Q23 and Q24 may be P-MOS transistors, or may be other electronic switches, which is not limited in the present application.

Fig. 18 is a schematic diagram of a switching tube rectifying circuit in which one upper tube is a controllable switching tube and one lower tube is a controllable switching tube. Fig. 19 shows a full-bridge synchronous rectification switching tube rectification circuit, namely, the first rectification device 11 is a controllable switching tube Q23; the second rectifying device 12 is a controllable switch tube Q24; the third rectifying device 13 is a controllable switch tube Q22; the fourth rectifying device 14 is a controllable switching tube Q21, and the control manner of the full-bridge synchronous rectification is shown by referring to the driving unit 216 and the second driving unit 215 of the upper tube and the lower tube.

Further, as shown in fig. 20, the embodiment of the present application further provides a full-bridge synchronous rectification switching tube rectification circuit, that is, the first rectification device 11 is a controllable switching tube Q23; the second rectifying device 12 is a controllable switch tube Q24; the third rectifying device 13 is a controllable switch tube Q22; the fourth rectifying device 14 is a controllable switch tube Q21;

the driving unit of the full-bridge synchronous rectification is shown as an icon 217 and comprises a voltage stabilizing tube ZD51, a controllable switch tube Q41, a controllable switch tube Q42, a resistor R51, a voltage stabilizing tube ZD52, a controllable switch tube Q31 and a controllable switch tube Q32; the cathode of the voltage stabilizing tube ZD51 is electrically connected with the first output end Vout+, and the control ends of the controllable switch tube Q41 and the controllable switch tube Q42 are electrically connected with the anode of the voltage stabilizing tube ZD 51; the first end of the controllable switch tube Q41 is electrically connected with the control end of the controllable switch tube Q23, the second end of the controllable switch tube Q41 is electrically connected with the second power line L2 and the first end of the controllable switch tube Q31, and the second end of the controllable switch tube Q31 is electrically connected with the control end of the controllable switch tube Q22; the first end of the controllable switch tube Q42 is electrically connected with the control end of the controllable switch tube Q24, the second end of the controllable switch tube Q42 is electrically connected with the first power line L1 and the first end of the controllable switch tube Q32, and the second end of the controllable switch tube Q32 is electrically connected with the control end of the controllable switch tube Q21; the resistor R51 is electrically connected between the anode of the voltage stabilizing tube ZD51 and the cathode of the voltage stabilizing tube ZD52, and the anode of the voltage stabilizing tube ZD52 is electrically connected with the second output end Vout; the control end of the controllable switch tube Q31 and the control end of the controllable switch tube Q32 are electrically connected with the cathode of the voltage stabilizing tube ZD 52. In this embodiment, the reference voltage terminals (the first reference voltage terminal and the second reference voltage terminal) of the driving unit 217 are obtained from the first output terminal vout+ by adding the voltage stabilizing tubes ZD51, ZD52 and the resistor R51, without externally connecting the power supply terminal VCC or Vref1/Vref2; specifically, the voltage between vout+ and Vout-is divided by voltage-stabilizing tubes ZD51, ZD52 and a resistor r51 to obtain driving voltages of Q41, Q42, Q31, Q32; the driving voltages of the Q41 and the Q42 used for driving the upper controllable switch tube are the same, and the driving voltages of the Q31 and the Q32 used for driving the lower controllable switch tube are the same.

In this example, the anode of the voltage regulator ZD51 always has a driving voltage for driving the controllable switching transistors Q41 and Q42, and the cathode of the voltage regulator ZD52 always has a driving voltage for driving the controllable switching transistors Q31 and Q32. When L1 is high level and L2 is low level, L2 is pulled down to the control end of Q23 through Q41, Q23 is conducted, when the GS voltage of Q41 drops to (ZD 51 anode voltage +Vth_Q2 point), Q41 is cut off, but Q23 is still conducted, and driving loss is saved; while L1 charges the gate of Q21 through Q32, Q21 is turned on; this phase forms a current loop of L1→Q23→Vout+ →Vout→Q21→L2. When L1 is low level and L2 is high level, L1 pulls down the control end of Q24 through Q42, Q24 is conducted, when the GC voltage of Q42 drops to (ZD 51 anode voltage +Vth_Q42 point), Q42 is cut off, but Q24 is still conducted, and driving loss is saved; and L2 charges the gate of Q22 through Q31, Q22 is turned on; this phase forms a current loop of L2→Q24→Vout+ →Vout→Q22→L1. The driving unit of the embodiment is realized by using the switching tube, and can realize the rapid discharge of the controllable switching tube serving as the rectifying device, so that the control is safer.

In the above embodiment, when the upper tube is a controllable switch tube, that is, the first rectifying device and/or the second rectifying device are controllable switch tubes, the controllable switch tube of the first rectifying device and/or the second rectifying device may be a P-MOS tube with a body diode or a negative voltage/low level driving conducting electronic switch, and may further include a negative voltage/low level driving conducting electronic switch and an external diode connected in parallel with the negative voltage/low level driving conducting electronic switch.

When the lower tube is a controllable switch tube, that is, the third rectifying device and/or the fourth rectifying device are controllable switch tubes, the controllable switch tubes of the third rectifying device and/or the fourth rectifying device can be N-MOS tubes with body diodes or high-level/positive-voltage driven and conducted electronic switches, and can also comprise high-level/positive-voltage driven and conducted electronic switches and external diodes connected with the high-level/positive-voltage driven and conducted electronic switches in parallel.

In the above embodiment, the first rectifying device 11 to the fourth rectifying device 14 may be one or more of which are controllable switching transistors, and the other of which are commonly used diodes; of course, all 4 rectifying devices can be controllable switch tubes, and the application is not limited. The driving units of the controllable switching transistors are described above and will not be described in detail here.

The switching tube rectifying circuit provided by the application can be connected to a switching power supply or a linear power supply of an AC power grid with a rectifying bridge, and also can be connected to a switching power supply or a linear power supply of which the DC voltage input can be used for both positive and negative polarity input.

The foregoing disclosure is directed to the preferred embodiment of the present application and is not intended to limit the scope of the claims, but rather to cover all modifications, equivalents, alternatives, and improvements that fall within the spirit and scope of the application.

Claims (15)

1. The switching tube rectifying circuit is characterized by comprising a first rectifying device, a second rectifying device, a third rectifying device, a fourth rectifying device, a first power line, a second power line, a first output end, a second output end and a driving unit; the first end of the first rectifying device is electrically connected with the first power line, and the second end of the first rectifying device is electrically connected with the first output end; the first end of the second rectifying device is electrically connected with the second power line, and the second end of the second rectifying device is electrically connected with the first output end; the first end of the third rectifying device is electrically connected with the first power line, and the second end of the third rectifying device is electrically connected with the second output end; the first end of the fourth rectifying device is electrically connected with the second power line, and the second end of the fourth rectifying device is electrically connected with the second output end;

at least one of the first rectifying device, the second rectifying device, the third rectifying device and the fourth rectifying device is a controllable switch tube, the controllable switch tube further comprises a control end, at least one end of the driving unit is electrically connected with the control end of the controllable switch tube, and the other end of the driving unit is electrically connected with the power supply end.

2. The switching tube rectifying circuit according to claim 1, wherein said fourth rectifying device is a controllable switching tube Q21, and said driving unit comprises a resistor R21 and a diode D21 connected in series; the cathode of the diode D21 is electrically connected with the first power line, the first end of the resistor R21 is electrically connected with the power supply end, and the common end of the resistor R21 and the diode D21 is electrically connected with the control end of the controllable switch tube Q21;

and/or the number of the groups of groups,

the third rectifying device is a controllable switch tube Q22; the driving unit comprises a resistor R22 and a diode D22 which are connected in series; the cathode of the diode D22 is electrically connected with the second power line, the first end of the resistor R22 is electrically connected with the power supply end, and the common end of the resistor R22 and the diode D22 is electrically connected with the control end of the controllable switch tube Q22.

3. Switching tube rectifying circuit according to claim 2, characterized in that said driving unit further comprises a capacitor C21 and/or a capacitor C22; the capacitor C21 is connected between the control end of the controllable switch tube Q21 and the second output end; the capacitor C22 is connected between the controllable switch tube Q22 and the second output end; the power supply end is the first output end or an external power supply end.

4. The switching tube rectifying circuit according to claim 2, wherein the driving unit further comprises a regulator tube ZD21 and/or a regulator tube ZD22; the voltage stabilizing tube ZD21 is connected between the control end of the controllable switch tube Q21 and the second output end; the voltage stabilizing tube ZD22 is connected between the controllable switch tube Q22 and the second output end; the power supply end is the first output end or an external power supply end.

5. The switching tube rectifying circuit according to claim 1, wherein said fourth rectifying device is a controllable switching tube Q21, and said driving unit includes a resistor R21, a diode D21, a switching tube Q211, a resistor R22, and a diode D22; the resistor R21, the diode D21 and the switching tube Q211 are connected in series and then connected between the power supply end and the first power line, and the cathode of the diode D21 is electrically connected with the first power line; the anode of the diode D21 is electrically connected with the control end of the controllable switch tube Q21; the resistor R22 and the diode D22 are connected in series and then connected between the power supply end and the second power line, the cathode of the diode D22 is electrically connected with the second power line, and the anode of the diode D22 is electrically connected with the control end of the switching tube Q211.

6. The switching tube rectifying circuit according to claim 5, wherein said third rectifying device is a controllable switching tube Q22; the driving unit further comprises a switching tube Q221; the switch tube Q221 is connected in series with the resistor R22 and the diode D22 and then is connected between the power supply end and the second power line; the anode of the diode D22 is electrically connected with the control end of the switching tube Q22; the anode of the diode D21 is also electrically connected to the control terminal of the switching tube Q221.

7. The switching tube rectifying circuit according to claim 1, wherein said third rectifying device is a controllable switching tube Q22; the driving unit comprises a diode D31 and a resistor R31; the resistor R31 is connected in parallel with a diode D31, the cathode of the diode D31 is electrically connected with the second power line L2, and the anode of the diode D31 is electrically connected with the control end of the controllable switch tube Q22;

and/or the number of the groups of groups,

the fourth rectifying device is a controllable switch tube Q21; the driving unit comprises a first driving unit, wherein the first driving unit comprises a resistor R32 and a diode D32; the resistor R32 is connected in parallel with the diode D32, the cathode of the diode D32 is electrically connected with the first power line, and the anode of the diode D32 is electrically connected with the control end of the controllable switch tube Q21.

8. The switching tube rectifying circuit according to claim 7, further comprising a regulator tube ZD31 and/or a regulator tube ZD32;

the voltage stabilizing tube ZD31 is connected in parallel between the control end and the second output end of the controllable switch tube Q22, and the cathode of the voltage stabilizing tube ZD31 is electrically connected with the control end of the controllable switch tube Q22;

the voltage stabilizing tube ZD32 is connected in parallel between the control end and the second output end of the controllable switch tube Q21, and the cathode of the voltage stabilizing tube ZD32 is electrically connected with the control end of the controllable switch tube Q21.

9. The switching tube rectifying circuit according to claim 1 or 7 or 8, wherein said first rectifying device is a controllable switching tube Q23; the driving unit comprises a diode D33, a resistor R33 and a voltage stabilizing tube ZD33; the resistor R33 is connected in parallel with a diode D33, the cathode of the diode D33 is electrically connected with the control end of the controllable switch tube Q23, and the anode of the diode D33 is electrically connected with the second power line; the voltage stabilizing tube ZD33 is connected in parallel between the control end and the first output end of the controllable switch tube Q23, and the anode of the voltage stabilizing tube ZD33 is electrically connected with the control end of the controllable switch tube Q23;

and/or the number of the groups of groups,

the second rectifying device is a controllable switch tube Q24; the driving unit comprises a diode D34, a resistor R34 and a voltage stabilizing tube ZD34; the resistor R34 is connected in parallel with a diode D34, the cathode of the diode D34 is electrically connected with the control end of the controllable switch tube Q24, and the anode of the diode D34 is electrically connected with the first power line; the voltage stabilizing tube ZD34 is connected in parallel between the control end and the first output end of the controllable switch tube Q24, and the anode of the voltage stabilizing tube ZD34 is electrically connected with the control end of the controllable switch tube Q24.

10. The switching tube rectifying circuit according to claim 1, wherein said third rectifying device is a controllable switching tube Q22; the driving unit comprises a controllable switch tube Q31, a first end of the controllable switch tube Q31 is electrically connected with the second power line, a second end of the controllable switch tube Q31 is electrically connected with a control end of the controllable switch tube Q22, and a control end of the controllable switch tube Q31 is electrically connected with a first reference voltage end;

and/or the number of the groups of groups,

the fourth rectifying device is a controllable switch tube Q21; the driving unit comprises a controllable switch tube Q32, a first end of the controllable switch tube Q32 is electrically connected with the first power line, a second end of the controllable switch tube Q32 is electrically connected with a control end of the controllable switch tube Q21, and a control end of the controllable switch tube Q32 is electrically connected with the first reference voltage end.

11. The switching tube rectifying circuit according to claim 10, characterized in that the driving unit comprises a second driving unit comprising a first delay circuit and/or a second delay circuit;

the first delay circuit comprises a resistor R41, a diode D41 and a capacitor C41; the cathode of the diode D41 is electrically connected with the second power line; the first end of the controllable switch tube Q31 is electrically connected with the second power line through the resistor R41, and the anode of the diode D41 is electrically connected with the control end of the controllable switch tube Q22 or the first end of the controllable switch tube Q31; the second end of the controllable switch tube Q31 is electrically connected with the second output end through the capacitor C41;

The second delay circuit comprises a resistor R42, a diode D42 and a capacitor C42; the cathode of the diode D42 is electrically connected with the first power line; the first end of the controllable switch tube Q32 is electrically connected with the first power line through the resistor R42, and the anode of the diode D42 is electrically connected with the control end of the controllable switch tube Q21 or the first end of the controllable switch tube Q32; the second end of the controllable switch tube Q32 is electrically connected with the second output end through the capacitor C42.

12. The switching tube rectifying circuit according to claim 10, wherein said driving unit further comprises a regulator tube ZD41 and/or a regulator tube ZD42;

the cathode of the voltage stabilizing tube ZD41 is electrically connected with the second power line, and the anode of the voltage stabilizing tube ZD41 is electrically connected with the first end of the controllable switch tube Q31;

the cathode of the voltage stabilizing tube ZD42 is electrically connected with the first power line, and the anode of the voltage stabilizing tube ZD42 is electrically connected with the first end of the controllable switch tube Q32.

13. The switching tube rectifying circuit according to claim 1 or 10 or 11 or 12, wherein said first rectifying device is a controllable switching tube Q23; the driving unit comprises a controllable switch tube Q41; the first end of the controllable switch tube Q41 is electrically connected with the control end of the controllable switch tube Q23, and the second end of the controllable switch tube Q41 is electrically connected with the second power line; the control end of the controllable switch tube Q41 is electrically connected with a second reference voltage end;

And/or the number of the groups of groups,

the second rectifying device is a controllable switch tube Q24; the driving unit comprises a controllable switch tube Q42; the first end of the controllable switch tube Q42 is electrically connected with the control end of the controllable switch tube Q24, and the second end of the controllable switch tube Q42 is electrically connected with the first power line; the control end of the controllable switch tube Q42 is electrically connected with the second reference voltage end.

14. The switching tube rectifying circuit according to claim 1, wherein said first rectifying device is a controllable switching tube Q23; the second rectifying device is a controllable switch tube Q24; the third rectifying device is a controllable switch tube Q22; the fourth rectifying device is a controllable switch tube Q21;

the driving unit comprises a voltage stabilizing tube ZD51, a controllable switch tube Q41, a controllable switch tube Q42, a resistor R51, a voltage stabilizing tube ZD52, a controllable switch tube Q31 and a controllable switch tube Q32; the cathode of the voltage stabilizing tube ZD51 is electrically connected with the first output end, and the control ends of the controllable switch tube Q41 and the controllable switch tube Q42 are electrically connected with the anode of the voltage stabilizing tube ZD 51; the first end of the controllable switch tube Q41 is electrically connected with the control end of the controllable switch tube Q23, the second end of the controllable switch tube Q41 is electrically connected with the second power line and the first end of the controllable switch tube Q31, and the second end of the controllable switch tube Q31 is electrically connected with the control end of the controllable switch tube Q22; the first end of the controllable switch tube Q42 is electrically connected with the control end of the controllable switch tube Q24, the second end of the controllable switch tube Q42 is electrically connected with the first power line and the first end of the controllable switch tube Q32, and the second end of the controllable switch tube Q32 is electrically connected with the control end of the controllable switch tube Q21; the resistor R51 is electrically connected between the anode of the voltage stabilizing tube ZD51 and the cathode of the voltage stabilizing tube ZD52, and the anode of the voltage stabilizing tube ZD52 is electrically connected with the second output end; the control end of the controllable switch tube Q31 and the control end of the controllable switch tube Q32 are electrically connected with the cathode of the voltage stabilizing tube ZD 52.

15. The switching tube rectifying circuit according to any one of claims 1 to 8 or any one of claims 10 to 12 or claim 14, wherein when the first rectifying device and/or the second rectifying device are controllable switching tubes, the controllable switching tubes of the first rectifying device and/or the second rectifying device are P-MOS tubes with body diodes or comprise an electronic switch and an external diode connected in parallel with the electronic switch;

when the third rectifying device and/or the fourth rectifying device are/is controllable switch tubes, the controllable switch tubes of the third rectifying device and/or the fourth rectifying device are N-MOS tubes with body diodes or comprise an electronic switch and an external diode connected with the electronic switch in parallel.