Energy recovery circuit, method and switching power supply

Abstract

The present invention relates to the field of integrated circuit technology, and relates to an energy recovery circuit and an energy recovery method, as well as a switching power supply using the energy recovery circuit or the energy recovery method. The energy recovery circuit has an inductive energy storage unit, including: a first switch tube, a second switch tube, a switching circuit, a drive control circuit, a first capacitor and a power conversion circuit; wherein, the energy recovery circuit includes two parts for charging the inductive energy storage unit, the first part is that the charging current flows to the ground through the first switch tube and the second switch tube, and the second part is that the charging current flows to the ground through the first switch tube, the switching circuit and the first capacitor, and the energy storage of the first capacitor is used to realize the energy recovery of the charging current of the inductive energy storage unit. By recycling and utilizing the charging current of the inductive energy storage unit to power the system, costs can be saved and system efficiency can be improved.

Description

Technical Field

[0001] The present invention relates to the technical field of integrated circuits, and in particular to an energy recovery circuit and an energy recovery method, as well as a switching power supply using the energy recovery circuit or the energy recovery method. Background Art

[0002] The switching power supply converts the input signal into an output signal by turning the switch on and off. Generally, the switching power supply uses a control chip to control the on and off of the switch, and the control chip needs to be powered by a DC voltage.

[0003] Figure 1 It is an existing switching power supply circuit, where an input voltage source (usually including a rectifier, a filter circuit, etc.) outputs an uncontrolled DC bus voltage Vbus. When the switch tube MP is turned on, the charging current of the inductor LP by the Vbus voltage flows through LP and the switch tube MP to GND. When M1 is turned off, the energy on the inductor LP is transferred to the load through the diode D to provide the load with the required voltage or current.

[0004] In the above conventional switching power supply circuit, the charging current of the inductor flows directly to GND and is not utilized, resulting in energy waste and reduced efficiency. Summary of the invention

[0005] The present invention provides an energy recovery circuit and an energy recovery method, as well as a switching power supply using the energy recovery circuit or the energy recovery method. By recovering energy from the charging current of an inductive energy storage unit to power the system, resources can be effectively utilized, costs can be saved, and the system conversion efficiency of the switching power supply can be improved.

[0006] An energy recovery circuit according to an embodiment of the present invention has an inductive energy storage unit, including: a first switch tube, having a first end, a second end and a control end, wherein the first end is electrically coupled to the first end of the inductive energy storage unit; a second switch tube, having a first end, a second end and a control end, wherein the first end is electrically coupled to the second end of the first switch tube, and the second end is electrically coupled to ground; a switching circuit, having a first end, a second end and a control end, wherein the first end is electrically coupled to the second end of the first switch tube and the first end of the second switch tube; a drive control circuit, electrically coupled to the first switch tube, the second switch tube and the control end of the switching circuit, and controlling the first switch tube, the second switch tube and the control end of the switching circuit. The two switching tubes and the switching circuit are turned on and off; a first capacitor has a first end and a second end, the first end of which is electrically coupled to the second end of the switching circuit, and the second end is electrically coupled to the ground; and a power conversion circuit is electrically coupled to the drive control circuit to provide a power supply voltage for the drive control circuit; wherein the energy recovery circuit charging the inductive energy storage unit includes two parts, the first part is the charging current flowing to the ground through the first switching tube and the second switching tube, and the second part is the charging current flowing to the ground through the first switching tube, the switching circuit and the first capacitor, and the energy recovery of the charging current of the inductive energy storage unit is realized through the energy storage of the first capacitor.

[0007] According to an energy recovery circuit of one embodiment of the present invention, the power conversion circuit is electrically coupled to an external high-voltage power supply end through a high-voltage end of a high-voltage isolation unit, and the low-voltage end of the high-voltage isolation unit is electrically coupled to a voltage regulator. The voltage output by the voltage regulator is used as the power supply voltage output by the power conversion circuit to the drive control circuit, and the level of the voltage is higher than the level of the voltage on the first capacitor.

[0008] According to an energy recovery circuit of one embodiment of the present invention, the voltage regulator is a linear voltage regulator, including an adjustment tube, an error amplifier and a feedback circuit. According to an energy recovery circuit of one embodiment of the present invention, the power conversion circuit includes a boost circuit inside, the voltage on the first capacitor is the input voltage of the boost circuit, the output voltage of the boost circuit is used as the power supply voltage output by the power conversion circuit to the drive control circuit, and the level of the output voltage of the boost circuit is higher than the level of its input voltage.

[0009] According to an energy recovery circuit of one embodiment of the present invention, the switching circuit is a switch, a first end of which is electrically coupled to the second end of the first switch tube and the first end of the second switch tube, a second end is electrically coupled to the first end of the first capacitor, and a control end is electrically coupled to the drive control circuit.

[0010] According to an energy recovery circuit of one embodiment of the present invention, the switching circuit is a diode, whose first end anode is electrically coupled to the second end of the first switch tube and the first end of the second switch tube, and whose second end cathode is electrically coupled to the first end of the first capacitor.

[0011] According to an energy recovery circuit of one embodiment of the present invention, the driving circuit has a first input terminal, a second input terminal, a third input terminal, a first output terminal, a second output terminal and a third output terminal, wherein the first input terminal is electrically coupled to the output terminal of the power conversion circuit, the second input terminal is electrically coupled to the first terminal of the first capacitor, and the third input terminal is electrically coupled to a voltage pulse control signal, and the generated first output terminal signal, second output terminal signal and third output terminal signal respectively control the conduction and shutdown of the first switch tube, the second switch tube and the switching circuit, wherein the voltage pulse high level of the first output terminal signal is higher than the voltage level on the first capacitor, or the high level is higher than the voltage level on the first capacitor for at least part of the time, and the voltage pulse high level of the third output terminal signal is higher than the voltage level on the first capacitor.

[0012] According to an energy recovery circuit of one embodiment of the present invention, the driving circuit has a first input terminal, a second input terminal, a third input terminal, a first output terminal and a second output terminal, wherein the first input terminal is electrically coupled to the output terminal of the power conversion circuit, the second input terminal is electrically coupled to the first terminal of the first capacitor, and the third input terminal is electrically coupled to a voltage pulse control signal, and the generated first output terminal signal and second output terminal signal respectively control the conduction and shutdown of the first switch tube and the second switch tube, wherein the voltage pulse high level of the first output terminal signal is higher than the voltage level on the first capacitor, or the high level is higher than the voltage level on the first capacitor for at least part of the time.

[0013] According to an embodiment of the present invention, an energy recovery method includes: in a first stage of a control cycle, the first switch tube remains turned off, and the inductive energy storage unit is not charged; in a second stage of a control cycle, the first switch tube remains turned on, the second switch tube remains turned off, the switching circuit is turned on to allow current to pass, the charging current of the inductive energy storage unit passes through the first switch tube, the switching circuit and the first capacitor flows to the ground, and energy recovery of the charging current of the inductive energy storage unit is achieved through the energy storage of the first capacitor; in a third stage of a control cycle, the first switch tube remains turned on, the second switch tube remains turned on, the switching circuit is turned off and does not pass current, and the charging current of the inductive energy storage unit flows directly to the ground through the first switch tube and the second switch tube, or flows to the ground through a current detection resistor.

[0014] According to an embodiment of the present invention, an energy recovery method includes: in a first stage of a control cycle, the first switch tube remains turned off, and the inductive energy storage unit is not charged; in a second stage of a control cycle, the first switch tube remains turned on, the second switch tube remains turned on, the switching circuit is turned off and no current passes through, and the charging current of the inductive energy storage unit flows directly to the ground through the first switch tube and the second switch tube, or flows to the ground through a current detection resistor; in a third stage of a control cycle, the first switch tube remains turned on, the second switch tube remains turned off, the switching circuit is turned on and can pass current, the charging current of the inductive energy storage unit flows to the ground through the first switch tube, the switching circuit and the first capacitor, and energy recovery of the charging current of the inductive energy storage unit is achieved through energy storage of the first capacitor; in a fourth stage of a control cycle, the first switch tube remains turned on, the second switch tube remains turned on, the switching circuit is turned off and no current passes through, and the charging current of the inductive energy storage unit flows directly to the ground through the first switch tube and the second switch tube, or flows to the ground through a current detection resistor.

[0015] An energy recovery module according to an embodiment of the present invention includes the energy recovery circuit or adopts the energy recovery method.

[0016] An energy recovery system according to an embodiment of the present invention includes the energy recovery module as described above; and also includes an auxiliary power supply module, wherein the auxiliary power supply module converts the energy recovered from the first capacitor into an auxiliary power supply voltage.

[0017] A switching power supply according to an embodiment of the present invention includes an input circuit, an output circuit and a load, and also includes the energy recovery module.

[0018] According to an embodiment of the present invention, an intelligent control switching power supply includes an input circuit, an output circuit and a load, and the energy recovery system; it also includes an intelligent control module electrically coupled to the energy recovery system, the intelligent control module receives the auxiliary power supply voltage, outputs an intelligent control signal to feedback control the energy recovery system, and realizes intelligent control of the switching power supply.

[0019] The intelligent control module according to an embodiment of the present invention may be a wireless control module such as a Bluetooth module, a WIFI module, a radar module or an infrared module.

[0020] By recycling the charging current of the inductive energy storage unit to power the system, costs can be saved and system efficiency can be improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 Shown is a schematic diagram of an existing switching power supply circuit;

[0022] Figure 2 FIG. 1 is a schematic diagram of an energy recovery circuit according to an embodiment of the present invention;

[0023] Figure 3A FIG. 1 is a schematic diagram of a power conversion circuit according to an embodiment of the present invention;

[0024] Figure 3B Shown is a schematic diagram of a power conversion circuit according to another embodiment of the present invention;

[0025] Figure 3C FIG. 1 is a schematic diagram of a power conversion circuit according to another embodiment of the present invention;

[0026] Figure 3D FIG. 1 is a schematic diagram of a switching circuit according to an embodiment of the present invention;

[0027] Figure 3E Shown is a schematic diagram of a switching circuit according to another embodiment of the present invention;

[0028] Figure 4A Shown is a waveform diagram of an embodiment of the present invention;

[0029] Figure 4B Shown is a waveform diagram of another embodiment of the present invention;

[0030] Figure 4C Shown is a waveform diagram of another embodiment of the present invention;

[0031] Figure 4D Shown is a waveform diagram of another embodiment of the present invention;

[0032] Figure 4E Shown is a waveform diagram of another embodiment of the present invention;

[0033] Figure 5A is a flow chart of an energy recovery method according to an embodiment of the present invention;

[0034] Figure 5B is a flow chart of an energy recovery method according to another embodiment of the present invention;

[0035] Figure 6 A switching power supply according to an embodiment of the present invention;

[0036] Figure 7 The invention relates to an intelligent switching power supply according to an embodiment of the present invention. DETAILED DESCRIPTION

[0037] The specific embodiments of the present invention will be described in detail below. It should be noted that the embodiments described herein are only for illustration and are not intended to limit the present invention. In the following description, a large number of specific details are set forth in order to provide a thorough understanding of the present invention. However, it is obvious to those of ordinary skill in the art that these specific details do not have to be used to implement the present invention. In other examples, in order to avoid confusing the present invention, known circuits, materials or methods are not specifically described.

[0038] Throughout the specification, references to "one embodiment", "an embodiment", "an example" or "an example" mean that a particular feature, structure or characteristic described in conjunction with the embodiment or example is included in at least one embodiment of the present invention. Therefore, the phrases "in one embodiment", "in an embodiment", "an example" or "an example" that appear in various places throughout the specification do not necessarily refer to the same embodiment or example. In addition, particular features, structures or characteristics may be combined in one or more embodiments or examples in any appropriate combination and / or sub-combination. In addition, it should be understood by those of ordinary skill in the art that the drawings provided herein are for illustrative purposes and that the drawings are not necessarily drawn to scale. It should be understood that when an element is said to be "connected to" or "coupled to" another element, it may be directly connected or coupled to another element or there may be an intermediate element. In contrast, when an element is said to be "directly connected to" or "directly coupled to" another element, there is no intermediate element. The same reference numerals indicate the same element. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0039] Figure 2An energy recovery circuit 200 according to an embodiment of the present invention has an inductive energy storage unit L1, including: a first switch tube SW1, having a first end, a second end and a control end, wherein the first end is electrically coupled to the first end VD1 of the inductive energy storage unit L1; a second switch tube SW2, having a first end, a second end and a control end, wherein the first end is electrically coupled to the second end VD2 of the first switch tube SW1, and the second end is electrically coupled to ground; a switching circuit 210, having a first end, a second end and a control end, wherein the first end is electrically coupled to the second end of the first switch tube SW1 and the first end VD2 of the second switch tube SW2; a drive control circuit 220, electrically coupled to the first switch tube SW1, the second switch tube SW2 and the control ends G1, G2 and G3 of the switching circuit 210, and controlling the first switch tube SW1, the second switch tube SW2 and the switching circuit 210 On and off; a first capacitor C2, having a first end and a second end, wherein the first end VCC is electrically coupled to the second end of the switching circuit 210, and the second end is electrically coupled to the ground (for the convenience of description, the voltage VCC on the capacitor C2 is equivalent to the first end of the capacitor C2); and a power conversion circuit 230, electrically coupled to the drive control circuit 220, providing a power supply voltage VDDH for the drive control circuit 220; wherein, the energy recovery circuit 200 charging the inductor energy storage unit L1 includes two parts, the first part is the charging current IL flowing to the ground through the first switch tube SW1 and the second switch tube SW2, and the second part is the charging current IL flowing to the ground through the first switch tube SW1, the switching circuit 210 and the first capacitor C2, and the energy storage of the first capacitor C2 is used to realize the energy recovery of the charging current IL of the inductor energy storage unit L1.

[0040] In one embodiment of the present invention, Figure 3A As shown, the power conversion circuit 230 of the energy recovery circuit 200 is electrically coupled to the external high-voltage power supply terminal HV through the high-voltage end of a high-voltage isolation unit. In one embodiment, the high-voltage end of the high-voltage isolation unit refers to the drain end of the JFET or the depletion-type LDMOS; in one embodiment, the external high-voltage power supply terminal HV refers to the bus voltage after the rectifier bridge; the low-voltage end of the high-voltage isolation unit is electrically coupled to a voltage regulator. In one embodiment, the low-voltage end of the high-voltage isolation unit refers to the source end of the JFET or the depletion-type LDMOS; the voltage VCCH output by the voltage regulator is used as the power supply voltage VCCH output by the power conversion circuit 230 to the drive control circuit 220, and the level of the voltage VCCH is higher than the level of the voltage VCC on the first capacitor C2. Therefore, the control signal G1 output by the drive control circuit 220S can quickly turn on the first switch tube SW1, so that the energy recovery circuit 200 can work normally.

[0041] In one embodiment of the present invention, Figure 3AAs shown, the voltage regulator is a linear voltage regulator, including an adjustment tube MP1, an error amplifier OP1 and a feedback circuit K. The sampling signal VCCH*K is obtained by sampling the output terminal voltage VCCH and a reference voltage VREF for error comparison, and an error voltage is generated to control the control terminal of the adjustment tube MP1, so that the sampling voltage VCCH*K=VREF.

[0042] In one embodiment of the present invention, the power conversion circuit 230 of the energy recovery circuit 200 includes a boost circuit inside, the voltage VCC on the first capacitor C2 is the input voltage of the boost circuit, and the output voltage VCCH of the boost circuit is used as the power supply voltage output by the power conversion circuit 230 to the drive control circuit 220, and the level of the boost circuit output voltage VCCH is higher than the level of its input voltage VCC.

[0043] In one embodiment of the present invention, Figure 3B As shown, the boost voltage is a capacitor boost circuit, including switches SP1 and SP2, capacitors CP1 and CO1, and diodes DP1 and DP2.

[0044] In one embodiment of the present invention, Figure 3C As shown, the boost voltage is an inductor boost circuit, including a switch MB1, an inductor LB1, a capacitor CB1 and a diode DB1.

[0045] In one embodiment of the present invention, Figure 3D As shown, the switching circuit 210 of the energy recovery circuit 200 is a switch SW3, a first end of which is electrically coupled to the second end of the first switch tube SW1 and the first end VD2 of the second switch tube SW2, a second end of which is electrically coupled to the first end VCC of the first capacitor C2, and a control end of which is electrically coupled to the output end G3 of the drive control circuit 220. When the voltage pulse of G3 is at a high level VCCH, and the level of VCCH is higher than the voltage VCC on the first capacitor C2, the switch SW3 is turned on, and the switching circuit 210 can conduct current; when the voltage pulse of G3 is at a low level, the switch SW3 is turned off, and the switching circuit 210 cannot conduct current.

[0046] In one embodiment of the present invention, Figure 3E As shown, the switching circuit 210 of the energy recovery circuit 200 is a diode, a first end anode of which is electrically coupled to the second end of the first switch tube SW1 and the first end VD2 of the second switch tube SW2, and a second end cathode of which is electrically coupled to the first end of the first capacitor C2. When the voltage of VD2 is higher than the VCC voltage, the switching circuit 210 can conduct current, and when the voltage of VD2 is lower than the VCC voltage, the switching circuit 210 cannot conduct current.

[0047] A driving control circuit 220 in an embodiment of the present invention, such as Figure 2 As shown, it has a first input terminal VCCH, a second input terminal VCC, a third input terminal PWM, a first output terminal G1, a second output terminal G2 and a third output terminal G3, wherein the first input terminal is electrically coupled to the output terminal VCCH of the power conversion circuit 230, the second input terminal is electrically coupled to the first terminal VCC of the first capacitor C2, and the third input terminal is electrically coupled to a voltage pulse PWM control signal, and the first output terminal signal G1, the second output terminal signal G2 and the third output terminal signal G3 generated by the driving control circuit 220 are respectively controlled to turn on and off the first switch tube SW1, the second switch tube SW2 and the switching circuit 210, and the switching circuit 210 is combined with the first input terminal VCCH of the power conversion circuit 230. Figure 4C , Figure 4D and Figure 4E Schematic diagram of waveform, wherein the voltage pulse high level VCCH of the first output terminal signal G1 is higher than the level of the voltage VCC on the first capacitor C2 ( Figure 4E ), or the high level VCCH is higher than the level of the voltage VCC on the first capacitor C2 for at least part of the time ( Figure 4C and Figure 4D ), the voltage pulse high level VCCH of the third output terminal signal G3 is higher than the level of the voltage VCC on the first capacitor C2;

[0048] When the switching circuit 210 is a switch, as long as the voltage pulse high level VCCH of G3 is higher than a threshold voltage of VCC, the switching circuit 210 can conduct current, and the voltage of VD2 will be approximately equal to the voltage of VCC; as long as the voltage pulse high level VCCH of G1 is higher than a threshold voltage of VCC, the first switch tube SW1 can conduct current. In order to simplify the description, the threshold voltages of all switches and the forward conduction voltage drop of the diode are approximately equal to zero.

[0049] by Figure 4E The waveform diagram of is taken as an example to expand in detail. Figure 4C and Figure 4D The principle is similar.

[0050] In the first stage T1 of a control cycle, G1 remains at a low level, the first switch tube SW1 remains off, and the inductor energy storage unit L1 is not charged. In this stage, the VD1 voltage remains at a high level. Figure 4E The state of the middle dotted line indicates an uncertain state, which can be a high level or a low level;

[0051] In the second stage T2 of a control cycle, G2 remains at a high level, the second switch tube SW2 remains on, G1 remains at a high level, and the high level VCCH of G1 is higher than the level of VCC, the first switch tube SW1 remains on, the control signal G3 of the switching circuit 210 remains at a low level, the switching circuit 210 remains off, and the charging current IL of the inductive energy storage unit L1 flows directly to the ground through the first switch tube SW1 and the second switch tube SW2, or flows to the ground through the current detection resistor Rcs. In this stage, the VD1 voltage and the VD2 voltage are approximately equal to the zero voltage, or the voltage on the current detection resistor Rcs;

[0052] In the third stage T3 of a control cycle, G2 remains at a low level, the second switch tube SW2 remains off, the control signal G3 of the switching circuit 210 remains at a high level, and the high level voltage VCCH of G3 is higher than the voltage VCC on the capacitor C2, so the switching circuit 210 remains on, G1 remains at a high level, and the high level VCCH of G1 is higher than the voltage VCC on the capacitor C2, so the first switch tube SW1 remains on, and the charging current IL of the inductor energy storage unit L1 flows to the ground through the first switch tube SW1, the switching circuit 210 and the first capacitor C2, and the energy storage of the first capacitor C2 realizes the energy recovery of the charging current IL of the inductor energy storage unit L1. At this stage, the voltages VD1 and VD2 are approximately equal to the voltage VCC on the capacitor C2;

[0053] In the fourth stage T4 of a control cycle, G2 remains at a high level, the second switch tube SW2 remains on, G1 remains at a high level, and the high level VCCH of G1 is higher than the level of VCC, the first switch tube SW1 remains on, the control signal G3 of the switching circuit 210 remains at a low level, the switching circuit 210 remains off, and the charging current IL of the inductive energy storage unit L1 flows directly to the ground through the first switch tube SW1 and the second switch tube SW2, or flows to the ground through the current detection resistor Rcs. At this stage, the VD1 voltage and the VD2 voltage are approximately equal to the zero voltage, or the voltage on the current detection resistor Rcs.

[0054] A driving control circuit 220 in an embodiment of the present invention, such as Figure 2 As shown, it has a first input terminal VCCH, a second input terminal VCC, a third input terminal voltage pulse signal PWM, a first output terminal G1 and a second output terminal G2, wherein the first input terminal is electrically coupled to the output terminal VCCH of the power conversion circuit 230, the second input terminal is electrically coupled to the first terminal VCC of the first capacitor C2, and the third input terminal is electrically coupled to a voltage pulse PWM control signal, and the first output terminal signal G1 and the second output terminal signal G2 generated by the driving control circuit 220 are used to control the conduction and shutoff of the first switch tube SW1 and the second switch tube SW2, respectively. Figure 4A and Figure 4B As shown in the waveform diagram, the voltage pulse high level VCCH of the first output terminal signal G1 is higher than the level of the voltage VCC on the first capacitor C2 ( Figure 4B ), or the high level VCCH is higher than the level of the voltage VCC on the first capacitor C2 for at least part of the time ( Figure 4A ).

[0055] When the switching circuit 210 is a diode, as long as the voltage pulse high level VCCH of G1 is higher than VCC plus a forward voltage drop of a diode, the first switch tube SW1 can be turned on.

[0056] by Figure 4B The waveform diagram of is taken as an example to expand in detail. Figure 4A The principle is similar.

[0057] In the first stage T1 of a control cycle, G1 remains at a low level, the first switch tube SW1 remains off, and the inductor energy storage unit L1 is not charged. In this stage, the VD1 voltage remains at a high level. Figure 4B The state of the middle dotted line indicates an uncertain state, which can be a high level or a low level;

[0058] In the third stage T3 of a control cycle, G2 remains at a low level, the second switch tube SW2 remains off, and the VD2 voltage will increase. When the VD2 voltage increases to a level higher than the voltage VCC of the first capacitor C2, the diode inside the switching circuit 210 will automatically turn on. At this time, the VD2 voltage is approximately equal to the VCC voltage. Since G1 remains at a high level, and the high level VCCH of G1 is higher than the voltage VCC on the capacitor C2, the first switch tube SW1 remains on, and the charging current IL of the inductor energy storage unit L1 flows to the ground through the first switch tube SW1, the switching circuit 210 and the first capacitor C2. The energy storage of the first capacitor C2 realizes the energy recovery of the charging current IL of the inductor energy storage unit L1. At this stage, the VD1 voltage and the VD2 voltage are approximately equal to the voltage VCC on the capacitor C2.

[0059] In the fourth stage T4 of a control cycle, G2 remains at a high level, the second switch tube SW2 remains on, VD2 is pulled down to a low level, the switching circuit 210 remains off, G1 remains at a high level, and the high level VCCH of G1 is higher than the level of VCC, the first switch tube SW1 remains on, and the charging current IL of the inductor energy storage unit L1 flows directly to the ground through the first switch tube SW1 and the second switch tube SW2, or flows to the ground through the current detection resistor Rcs. At this stage, the VD1 voltage and the VD2 voltage are approximately equal to the zero voltage, or the voltage on the current detection resistor Rcs, and the energy of the charging current IL of the inductor energy storage unit L1 is not recovered at this stage.

[0060] It should be noted that the working state described in some of the above embodiments refers to the working state of the energy recovery circuit 200 under steady-state conditions. When the power is just turned on or the system has not yet reached a steady state, the working state of the energy recovery circuit 200 will be different. For example, in a control cycle, there may be fewer or additional other states, but these intermediate unstable states do not affect the final steady-state working state.

[0061] Figure 5A 4 is a flow chart of an energy recovery method according to an embodiment of the present invention, including steps 511 to 513.

[0062] Step 511, in the first stage of a control cycle, the first switch tube remains turned off, and the inductive energy storage unit is not charged;

[0063] Step 512, in the second stage of a control cycle, the first switch tube remains on, the second switch tube remains off, the switching circuit is turned on to allow current to pass, the charging current of the inductive energy storage unit flows through the first switch tube, the switching circuit and the first capacitor to the ground, and the energy storage of the first capacitor is used to realize energy recovery of the charging current of the inductive energy storage unit;

[0064] Step 513, in the third stage of a control cycle, the first switch tube remains on, the second switch tube remains on, the switching circuit is turned off and no current passes through it, and the charging current of the inductive energy storage unit flows directly to the ground through the first switch tube and the second switch tube, or flows to the ground through the current detection resistor.

[0065] Figure 5B 4 is a flow chart of an energy recovery method according to an embodiment of the present invention, including steps 521 to 524.

[0066] Step 521, in the first stage of a control cycle, the first switch tube remains turned off, and the inductive energy storage unit is not charged;

[0067] Step 522, in the second stage of a control cycle, the first switch tube remains on, the second switch tube remains on, the switching circuit is turned off and does not pass current, and the charging current of the inductive energy storage unit flows directly to the ground through the first switch tube and the second switch tube, or flows to the ground through the current detection resistor;

[0068] Step 523, in the third stage of a control cycle, the first switch tube remains on, the second switch tube remains off, the switching circuit is turned on to allow current to pass, the charging current of the inductive energy storage unit flows through the first switch tube, the switching circuit and the first capacitor to the ground, and the energy storage of the first capacitor is used to realize energy recovery of the charging current of the inductive energy storage unit;

[0069] Step 524, in the fourth stage of a control cycle, the first switch tube remains on, the second switch tube remains on, the switching circuit is turned off and no current passes through it, and the charging current of the inductive energy storage unit flows directly to the ground through the first switch tube and the second switch tube, or flows to the ground through the current detection resistor.

[0070] An energy recovery module according to an embodiment of the present invention includes the energy recovery circuit or adopts the energy recovery method.

[0071] Figure 6 The figure shows a switching power supply 600 according to an embodiment of the present invention, which includes an input circuit, an output circuit and a load, and also includes the energy recovery module 611 .

[0072] Figure 7 FIG. 7 shows an intelligent switching power supply 700 and an energy recovery system 710 according to an embodiment of the present invention.

[0073] The energy recovery system 710 includes the energy recovery module 711 and an auxiliary power supply module 712. The auxiliary power supply module 712 is electrically coupled to the first capacitor C2 and converts the energy recovered from the first capacitor C2 into an auxiliary power supply voltage VCCL.

[0074] The intelligent control switching power supply 700 includes an input circuit, an output circuit and a load, and an energy recovery system 710; it also includes an intelligent control module 721, which is electrically coupled to the energy recovery system 710. The intelligent control module 721 receives power from the auxiliary power supply voltage VCCL and outputs an intelligent control signal DCTL to feedback control the energy recovery system 710, thereby realizing intelligent control of the switching power supply.

[0075] According to an embodiment of the present invention, the intelligent control module 721 may be a wireless control module such as a Bluetooth module, a WIFI module, a radar module, an infrared module, etc.

[0076] Although the present invention has been described with reference to several typical embodiments, it should be understood that the terms used are illustrative and exemplary, rather than restrictive. Since the present invention can be embodied in a variety of forms without departing from the spirit or essence of the invention, it should be understood that the above embodiments are not limited to any of the foregoing details, but should be interpreted broadly within the spirit and scope defined by the appended claims, and therefore all changes and modifications falling within the scope of the claims or their equivalents should be covered by the appended claims. For those of ordinary skill in the art, several improvements and modifications can be made without departing from the principles of the present invention, and these improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. An energy recovery circuit having an inductive energy storage unit, characterized in that: include: A first switch tube having a first end, a second end and a control end, wherein the first end is electrically coupled to the first end of the inductive energy storage unit; A second switch tube has a first end, a second end and a control end, wherein the first end is electrically coupled to the second end of the first switch tube, and the second end is electrically coupled to the ground; A switching circuit having a first end, a second end and a control end, wherein the first end is electrically coupled to the second end of the first switch tube and the first end of the second switch tube; A drive control circuit, electrically coupled to the first switch tube, the second switch tube and the control end of the switching circuit, controls the conduction and disconnection of the first switch tube, the second switch tube and the switching circuit; a first capacitor having a first terminal and a second terminal, wherein the first terminal is electrically coupled to the second terminal of the switching circuit and the second terminal is electrically coupled to ground; and A power conversion circuit is electrically coupled to the drive control circuit to provide a power supply voltage for the drive control circuit; in The energy recovery circuit charging the inductive energy storage unit includes two parts, the first part is that the charging current flows to the ground through the first switch tube and the second switch tube, and the second part is that the charging current flows to the ground through the first switch tube, the switching circuit and the first capacitor, and the energy recovery of the charging current of the inductive energy storage unit is realized through the energy storage of the first capacitor; The power conversion circuit includes a boost circuit inside, the voltage on the first capacitor is the input voltage of the boost circuit, the output voltage of the boost circuit is used as the power supply voltage output by the power conversion circuit to the drive control circuit, and the level of the output voltage of the boost circuit is higher than the level of its input voltage; The switching circuit is a switch, a first end of which is electrically coupled to the second end of the first switch tube and the first end of the second switch tube, a second end of which is electrically coupled to the first end of the first capacitor, and a control end of which is electrically coupled to the drive control circuit.

2. The energy recovery circuit according to claim 1, characterized in that: The power conversion circuit is electrically coupled to an external high-voltage power supply end through a high-voltage end of a high-voltage isolation unit, and the low-voltage end of the high-voltage isolation unit is electrically coupled to a voltage regulator. The voltage output by the voltage regulator is used as the power supply voltage output by the power conversion circuit to the drive control circuit, and the level of the voltage is higher than the level of the voltage on the first capacitor.

3. The energy recovery circuit according to claim 2, characterized in that: The voltage regulator is a linear voltage regulator, comprising a regulating tube, an error amplifier and a feedback circuit.

4. The energy recovery circuit according to claim 1, characterized in that: The switching circuit is a diode, a first end anode of which is electrically coupled to the second end of the first switch tube and the first end of the second switch tube, and a second end cathode of which is electrically coupled to the first end of the first capacitor.

5. The energy recovery circuit according to claim 1, characterized in that: The drive control circuit has a first input terminal, a second input terminal, a third input terminal, a first output terminal, a second output terminal and a third output terminal, wherein the first input terminal is electrically coupled to the output terminal of the power conversion circuit, the second input terminal is electrically coupled to the first terminal of the first capacitor, and the third input terminal is electrically coupled to a voltage pulse control signal. The generated first output terminal signal, second output terminal signal and third output terminal signal respectively control the conduction and shutdown of the first switch tube, the second switch tube and the switching circuit, wherein the voltage pulse high level of the first output terminal signal is higher than the voltage level on the first capacitor, or the high level is higher than the voltage level on the first capacitor for at least part of the time, and the voltage pulse high level of the third output terminal signal is higher than the voltage level on the first capacitor.

6. The energy recovery circuit according to claim 1, characterized in that: The drive control circuit has a first input terminal, a second input terminal, a third input terminal, a first output terminal and a second output terminal, wherein the first input terminal is electrically coupled to the output terminal of the power conversion circuit, the second input terminal is electrically coupled to the first terminal of the first capacitor, and the third input terminal is electrically coupled to a voltage pulse control signal, and the generated first output terminal signal and second output terminal signal respectively control the conduction and shutdown of the first switch tube and the second switch tube, wherein the voltage pulse high level of the first output terminal signal is higher than the voltage level on the first capacitor, or the high level is higher than the voltage level on the first capacitor for at least part of the time.

7. An energy recovery method comprising: In the first stage of a control cycle, the first switch tube remains turned off, and the inductive energy storage unit is not charged; In the second stage of a control cycle, the first switch tube remains on, the second switch tube remains off, the switching circuit is turned on to allow current to pass, the charging current of the inductive energy storage unit flows through the first switch tube, the switching circuit and the first capacitor to the ground, and the energy storage of the first capacitor is used to realize energy recovery of the charging current of the inductive energy storage unit; In the third stage of a control cycle, the first switch tube remains on, the second switch tube remains on, the switching circuit is turned off and no current passes through it, and the charging current of the inductive energy storage unit flows directly to the ground through the first switch tube and the second switch tube, or flows to the ground through the current detection resistor.

8. An energy recovery method comprising: In the first stage of a control cycle, the first switch tube remains turned off, and the inductive energy storage unit is not charged; In the second stage of a control cycle, the first switch tube remains on, the second switch tube remains on, the switching circuit is turned off and no current flows through it, and the charging current of the inductive energy storage unit flows directly to the ground through the first switch tube and the second switch tube, or flows to the ground through the current detection resistor; In the third stage of a control cycle, the first switch tube remains on, the second switch tube remains off, the switching circuit is turned on to allow current to pass, the charging current of the inductive energy storage unit flows through the first switch tube, the switching circuit and the first capacitor to the ground, and the energy storage of the first capacitor realizes energy recovery of the charging current of the inductive energy storage unit; In the fourth stage of a control cycle, the first switch tube remains on, the second switch tube remains on, the switching circuit is turned off and no current passes through it, and the charging current of the inductive energy storage unit flows directly to the ground through the first switch tube and the second switch tube, or flows to the ground through the current detection resistor.

9. An energy recovery module, characterized in that: The invention comprises an energy recovery circuit as claimed in any one of claims 1 to 6 or adopts an energy recovery method as claimed in any one of claims 7 to 8.

10. An energy recovery system, characterized in that: It comprises the energy recovery module as claimed in claim 9; and it also comprises an auxiliary power supply module, wherein the auxiliary power supply module converts the energy recovered from the first capacitor into an auxiliary power supply voltage.

11. A switching power supply, comprising an input circuit, an output circuit and a load, characterized in that: Also included is the energy recovery module as claimed in claim 9.

12. An intelligent control switching power supply, comprising an input circuit, an output circuit and a load, characterized in that: It includes the energy recovery system as described in claim 10; and also includes an intelligent control module electrically coupled to the energy recovery system, the intelligent control module receives the auxiliary power supply voltage, outputs an intelligent control signal feedback to control the energy recovery system, and realizes intelligent control of the switching power supply.

13. The intelligent control switching power supply according to claim 12, characterized in that: The intelligent control module is a Bluetooth module, a WIFI module, a radar module or an infrared module.

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