Rectification and filtering circuit, electronic circuit, and electronic equipment

Abstract

The present invention provides a rectifier and filter circuit, an electronic circuit, and an electronic device for rectifying and filtering an AC voltage. The circuit comprises: a rectifier module, which is used to rectify an input AC voltage and output a first DC voltage from a first end thereof; an energy storage component, which is used to store energy under the action of the first DC voltage; wherein the second end of the rectifier module is grounded; a switch tube, which is used to control the connection and isolation between the rectifier module and the energy storage component; a switch control module, which is used to compare a first DC signal with a first reference signal, and control the on and off of the switch tube according to the comparison result; wherein the first DC signal is positively correlated with the second DC voltage; the first DC voltage is positively correlated with the second DC voltage; the first reference signal is positively correlated with the upper voltage withstand limit of the energy storage component; and a surge protection module, which is used to clamp the current flowing through the switch tube within a first threshold value. The rectifier and filter circuit of the present invention can enable the energy storage component to withstand the input excess AC voltage.

Description

Technical Field

[0001] The present invention relates to the field of power supply control, and in particular to a rectifier filter circuit, an electronic circuit, and an electronic device. Background Art

[0002] With the development of third-generation semiconductor devices and PD fast charging, the power density of switching power supplies is required to be higher and higher. At this time, the volume of high-voltage electrolytic capacitors after the rectifier bridge will become an important factor in reducing the volume of chargers / adapters, especially in markets such as India that allow ultra-high voltage input (single-phase AC input voltage can be as high as 350V or even 420V). Existing technologies often require customized electrolytic capacitors with a withstand voltage of more than 500V or use multiple electrolytic capacitors in series to solve the withstand voltage problem of the energy storage electrolytic capacitors after rectification, which in turn limits the reduction of the power supply volume.

[0003] Please refer to Figure 1 For example, in the Chinese market, Vac = 264V, and the rectified DC voltage Vin = 373VDC. At this time, a 400V electrolytic capacitor can solve the problem of energy storage after rectification. However, in the Indian market, Vac will reach 350V, and the rectified DC voltage Vin = 495V. At this time, it is necessary to customize at least 500V electrolytic capacitors or use two 400V electrolytic capacitors in series to solve the problem of energy storage after rectification, which increases the size and cost of the entire power supply. Summary of the invention

[0004] The present invention provides a rectifier filter circuit, an electronic circuit and an electronic device, so as to enable an energy storage component to withstand excess AC input voltage.

[0005] According to a first aspect of the present invention, a rectifier and filter circuit is provided for rectifying and filtering an AC voltage. The circuit comprises:

[0006] a rectifier module, configured to input the AC voltage, rectify the AC voltage, and output a first DC voltage from a first end thereof;

[0007] An energy storage component is coupled between the first end and the second end of the rectifier module; the energy storage component is used to store energy under the action of the first DC voltage; wherein the second end of the rectifier module is grounded;

[0008] A switch tube, coupled between the energy storage component and the rectifier module; the switch tube is used to control the connection and isolation between the rectifier module and the energy storage component;

[0009] A switch control module, coupled to the gate of the switch tube; the switch control module is used to compare the first DC signal with the first reference signal, and control the on and off of the switch tube according to the comparison result; wherein the first DC signal is positively correlated with the second DC voltage; the first DC voltage is positively correlated with the second DC voltage; the first reference signal is positively correlated with the withstand voltage upper limit of the energy storage component;

[0010] The surge protection module is coupled between the switch tube and the rectifier module; the surge protection module is used to clamp the current flowing through the switch tube within a first threshold.

[0011] Optionally, the rectifier module includes a first rectifier unit and a second rectifier unit; the first end of the first rectifier unit serves as the first end of the rectifier module, and the second end of the first rectifier unit and the second end of the second rectifier unit both serve as the second end of the rectifier module; the first rectifier unit and the second rectifier unit are both used to rectify the input AC voltage, and output the first DC voltage and the second DC voltage from their respective first ends;

[0012] The energy storage component is coupled between the first end and the second end of the first rectifier unit;

[0013] The switch tube is coupled between the energy storage component and the second end of the first rectifier unit;

[0014] The switch control module is coupled between the first end of the second rectifier unit and the gate of the switch tube;

[0015] The surge protection module is coupled between the switch tube and the second end of the first rectifying unit.

[0016] Optionally, the rectifier module includes a first rectifier unit and a second rectifier unit; the first end of the first rectifier unit serves as the first end of the rectifier module, and the second end of the first rectifier unit and the second end of the second rectifier unit both serve as the second end of the rectifier module; the first rectifier unit and the second rectifier unit are both used to rectify the input AC voltage, and output the first DC voltage and the second DC voltage from their respective first ends;

[0017] The energy storage component is coupled between the first end and the second end of the first rectifier unit;

[0018] The switch tube is coupled between the energy storage component and the first end of the first rectifier unit;

[0019] The switch control module is coupled between the first end of the second rectifier unit and the gate of the switch tube;

[0020] The surge protection module is coupled between the switch tube and the first end of the first rectifying unit.

[0021] Optionally, the switch control module includes a first resistive unit, a second resistive unit, and a comparator;

[0022] The first end of the first resistive unit is connected to the first end of the second rectifying unit, and the second end thereof is respectively connected to the inverting input end of the comparator and the first end of the second resistive unit; the second end of the second resistive unit is grounded; the first resistive unit and the second resistive unit are used together to divide the second DC voltage, and output the first DC signal from the second end of the first resistive unit to the inverting input end of the comparator;

[0023] The first reference signal is input to the non-inverting input terminal of the comparator;

[0024] The comparator is used to compare the first reference signal and the first DC signal; if the first reference signal is greater than the first DC signal, the comparator outputs a high level to the gate of the switch tube to turn on the switch tube; if the first reference signal is less than the first DC signal, the comparator outputs a low level to the gate of the switch tube to turn off the switch tube.

[0025] Optionally, the switch control module further includes a third resistive unit, a fourth resistive unit, and a fifth resistive unit;

[0026] The first end of the third resistive unit is connected to the first reference signal, and the second end of the third resistive unit is respectively connected to the in-phase input end of the comparator, the first end of the fourth resistive unit, and the first end of the fifth resistive unit;

[0027] The second end of the fourth resistive unit is connected to the output end of the comparator;

[0028] The second end of the fifth resistive unit is grounded;

[0029] The third resistive unit, the fourth resistive unit and the fifth resistive unit are used together to divide the voltage of the first reference signal and to make the comparator a hysteresis comparator.

[0030] Optionally, the switch control module further includes a sixth resistive unit;

[0031] The sixth resistive unit is connected between the output terminal of the comparator and the gate of the switch tube.

[0032] Optionally, the surge protection module includes a seventh resistive unit and a first transistor;

[0033] The first end of the seventh resistive unit is respectively connected to the first end of the switch tube and the base of the first transistor, and the second end of the seventh resistive unit is respectively connected to the second end or the first end of the first rectifying unit and the first end of the first transistor;

[0034] The second terminal of the first transistor is connected to the gate of the switch tube;

[0035] If the current flowing through the sixth resistive unit exceeds the first threshold, the first transistor is turned on, so that the current flowing through the sixth resistive unit is clamped within the first threshold.

[0036] Optionally, the surge protection module further includes an eighth resistive unit;

[0037] The eighth resistive unit is connected between the first end of the switch tube and the base of the first transistor.

[0038] Optionally, the first resistive unit to the eighth resistive unit specifically include a resistor network.

[0039] Optionally, the rectifier module includes a first rectifier unit; the first end of the first rectifier unit serves as the first end of the rectifier module, and the second end of the first rectifier unit serves as the second end of the rectifier module; the first rectifier unit is used to rectify the input AC voltage and output the first DC voltage from the first end;

[0040] The energy storage component is coupled between the first end and the second end of the first rectifier unit;

[0041] The switch tube is coupled between the energy storage component and the second end of the first rectifier unit;

[0042] The switch control module is coupled between the first end of the first rectifier unit and the gate of the switch tube; wherein the first DC voltage is the same as the second DC voltage;

[0043] The surge protection module is coupled between the switch tube and the second end of the first rectifier unit;

[0044] The rectification and filtering circuit also includes a first diode unit; the anode of the first diode unit is coupled to the first end of the rectification module; the cathode of the first diode unit is coupled to the first end of the energy storage component.

[0045] Optionally, the rectifier module includes a first rectifier unit; the first end of the first rectifier unit serves as the first end of the rectifier module, and the second end of the first rectifier unit serves as the second end of the rectifier module; the first rectifier unit is used to rectify the input AC voltage and output the first DC voltage from the first end;

[0046] The energy storage component is coupled between the first end and the second end of the first rectifier unit;

[0047] The switch tube is coupled between the energy storage component and the first end of the first rectifier unit;

[0048] The switch control module is coupled between the first end of the first rectifier unit and the gate of the switch tube; wherein the first DC voltage is the same as the second DC voltage;

[0049] The surge protection module is coupled between the switch tube and the first end of the first rectifier unit;

[0050] The rectification and filtering circuit also includes a first diode unit; the anode of the first diode unit is coupled to the first end of the rectification module; the cathode of the first diode unit is coupled to the first end of the energy storage component.

[0051] Optionally, the switch control module includes a first resistive unit, a second resistive unit, and a comparator;

[0052] The first end of the first resistive unit is connected to the first end of the first rectifying unit, and the second end thereof is respectively connected to the inverting input end of the comparator and the first end of the second resistive unit; the second end of the second resistive unit is grounded.

[0053] Optionally, the first diode unit specifically includes a first diode.

[0054] According to a second aspect of the present invention, an electronic circuit is provided, comprising the rectifier and filter circuit according to the first aspect of the present invention and the optional solution.

[0055] According to a third aspect of the present invention, there is provided an electronic device comprising the electronic circuit according to the second aspect of the present invention.

[0056] The rectifier and filter circuit provided by the present invention compares the first DC voltage after voltage division, that is, the first DC signal, and the first reference signal through a switch control module; if the first reference signal is greater than the first DC signal, the comparator outputs a high level to turn on the switch tube, so that the energy storage component is connected to the rectifier module, indicating that the first DC voltage does not exceed the upper limit of the withstand voltage of the energy storage component at this time; if the first reference signal is less than the first DC signal, the comparator outputs a low level to turn off the switch tube, so that the energy storage component is isolated from the rectifier module, indicating that the first DC voltage exceeds the upper limit of the withstand voltage of the energy storage component at this time. Through the above method, the energy storage component is made to withstand the first DC voltage exceeding its rated withstand voltage value, so that the energy storage component with ordinary withstand voltage can perform rectification and filtering of high AC voltage. At the same time, when the switch tube is turned on, the current flowing through the switch tube is clamped within the first threshold value through the surge protection module to prevent the switch tube from being broken down by a large current. BRIEF DESCRIPTION OF THE DRAWINGS

[0057] Figure 1 It is a rectifier and filter circuit in the prior art;

[0058] Figure 2 The circuit structure frame of the rectifier and filter circuit provided by the embodiment of the present invention is Figure 1 ;

[0059] Figure 3 A schematic diagram of the circuit structure of the rectifier and filter circuit provided in an embodiment of the present invention Figure 1 ;

[0060] Figure 4 A schematic diagram of the circuit structure of the rectifier and filter circuit provided in an embodiment of the present invention Figure 2 ;

[0061] Figure 5 A schematic diagram of the circuit structure of the rectifier and filter circuit provided in an embodiment of the present invention Figure 3 ;

[0062] Figure 6 A schematic diagram of the circuit structure of the rectifier and filter circuit provided in an embodiment of the present invention Figure 4 ;

[0063] Figure 7 The circuit structure frame of the rectifier and filter circuit provided by the embodiment of the present invention is Figure 2 ;

[0064] Figure 8 The circuit structure frame of the rectifier and filter circuit provided by the embodiment of the present invention is Figure 3 ;

[0065] Fig. 9Waveform diagram of the AC voltage, the first DC voltage, and the second DC voltage provided in the embodiment of the present invention.

[0066] Description of the symbols in the accompanying drawings:

[0067] 10-rectifier module;

[0068] 11-a first rectifying unit;

[0069] 12- a second rectifying unit;

[0070] 20-Energy storage component;

[0071] 30- switch control module;

[0072] 40-surge protection module;

[0073] 50-a first diode unit;

[0074] Vac - alternating current voltage;

[0075] Vrec1-first DC voltage;

[0076] Vrec2-second DC voltage;

[0077] Vref-first reference signal;

[0078] D1-first diode;

[0079] D2-second diode;

[0080] D3-the third diode;

[0081] D4-the fourth diode;

[0082] D5 - fifth diode;

[0083] D6 - the sixth diode;

[0084] D7-seventh diode;

[0085] R1-first resistive unit;

[0086] R2-second resistive unit;

[0087] R3-third resistive unit;

[0088] R4-fourth resistive unit;

[0089] R5-fifth resistive unit;

[0090] R6-sixth resistive unit;

[0091] R7-seventh resistive unit;

[0092] R8-eighth resistive unit;

[0093] U1 - Comparator;

[0094] Q1- switch tube;

[0095] Q2 - First transistor. DETAILED DESCRIPTION

[0096] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present invention. The terms "first", "second", "third", "fourth", etc. (if any) in the specification and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present invention described here can be implemented in an order other than those illustrated or described here. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units that are clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0097] An embodiment of the present invention provides a rectifier and filter circuit for rectifying and filtering an AC voltage. The circuit includes:

[0098] a rectifier module, configured to input the AC voltage, rectify the AC voltage, and output a first DC voltage from a first end thereof;

[0099] An energy storage component is coupled between the first end and the second end of the rectifier module; the energy storage component is used to store energy under the action of the first DC voltage; wherein the second end of the rectifier module is grounded;

[0100] A switch tube, coupled between the energy storage component and the rectifier module; the switch tube is used to control the connection and isolation between the rectifier module and the energy storage component;

[0101] A switch control module, coupled to the gate of the switch tube; the switch control module is used to compare the first DC signal with the first reference signal, and control the on and off of the switch tube according to the comparison result; wherein the first DC signal is positively correlated with the second DC voltage; the first DC voltage is positively correlated with the second DC voltage; the first reference signal is positively correlated with the withstand voltage upper limit of the energy storage component;

[0102] The surge protection module is coupled between the switch tube and the rectifier module; the surge protection module is used to clamp the current flowing through the switch tube within a first threshold.

[0103] Example 1

[0104] Please refer to Figure 2 The rectifier module 10 provided in Embodiment 1 includes a first rectifier unit 11 and a second rectifier unit 12; the first end of the first rectifier unit 11 serves as the first end of the rectifier module 10, and the second end of the first rectifier unit 11 and the second end of the second rectifier unit 12 serve as the second end of the rectifier module 10; the first rectifier unit 11 and the second rectifier unit 12 are both used to rectify the input AC voltage Vac, and output the first DC voltage Vrec1 and the second DC voltage Vrec2 from their respective first ends respectively;

[0105] The energy storage component 20 is coupled between the first end and the second end of the first rectifying unit 11;

[0106] The switch tube Q1 is coupled between the energy storage component 20 and the second end of the first rectifying unit 11;

[0107] The switch control module 30 is coupled between the first end of the second rectifier unit 12 and the gate of the switch tube Q1;

[0108] The surge protection module 40 is coupled between the switch tube Q1 and the second end of the first rectifying unit 11 .

[0109] Please refer to Figure 3As a specific implementation, the first rectifier unit 11 and the second rectifier unit 12 are specifically bridge rectifier circuits; the cathode ends of the first diode D1 and the third diode D3 of the first rectifier unit 11 serve as the first end of the first rectifier unit 11, and output the first DC voltage Vrec1; the cathode ends of the fifth diode D5 and the sixth diode D6 of the second rectifier unit 12 serve as the first end of the first rectifier unit 11, and output the second DC voltage Vrec2; and the first rectifier unit 11 and the second rectifier unit 12 share the second diode D2 and the fourth diode D4; wherein, the first DC voltage Vrec1 and the second DC voltage Vrec2 are both pulsating DC voltages output after the AC voltage Vac is rectified by the first rectifier unit 11 and the second rectifier unit 12. Since the energy storage component 20 is connected to both ends of the first rectifier unit 11, the original ripples of the first DC voltage Vrec1 will be filtered out. Please refer to Fig. 9 , which is a waveform diagram of the AC voltage Vac, the first DC voltage Vrec1, and the second DC voltage Vrec2.

[0110] Please refer to Figure 3 As a specific implementation, the energy storage component 20 is specifically an electrolytic capacitor, which is used to store energy under the action of the first DC voltage Vrec1, and the upper voltage limit of the electrolytic capacitor is lower than the peak voltage of the first DC voltage Vrec1.

[0111] Please refer to Figure 4 As a specific implementation, the switch control module 30 specifically includes a first resistive unit R1, a second resistive unit R2, and a comparator U1;

[0112] The first end of the first resistive unit R1 is connected to the first end of the second rectifying unit 12, and the second end thereof is respectively connected to the inverting input end of the comparator U1 and the first end of the second resistive unit R2; the second end of the second resistive unit R2 is grounded; the first resistive unit R1 and the second resistive unit R2 are used together to divide the second DC voltage Vrec2, and output the first DC signal from the second end of the first resistive unit R1 to the inverting input end of the comparator U1; the first reference signal Vref is input to the non-inverting input end of the comparator U1; wherein, because the first reference signal Vref is specifically a voltage signal, the voltage magnitude is about several volts, and the specific magnitude is positively correlated with the upper voltage withstand limit of the energy storage component 20, which is not limited here; and the second DC voltage Vrec2 is obtained by rectifying the AC power input from the power grid, and the voltage magnitude is within several hundred volts, so the second DC voltage Vrec2 is divided by the first resistive unit R1 with a large resistance value, so that the magnitude of the second DC voltage Vrec2 is the same level as the first reference signal Vref, that is, the first DC signal.

[0113] The comparator U1 is used to compare the first reference signal Vref and the first DC signal; if the first reference signal Vref is greater than the first DC signal, the comparator U1 outputs a high level to the gate of the switch tube Q1 to turn on the switch tube Q1; if the first reference signal Vref is less than the first DC signal, the comparator U1 outputs a low level to the gate of the switch tube Q1 to turn off the switch tube Q1. As can be seen from the above, the first reference signal Vref can be used to characterize the upper limit of the withstand voltage of the energy storage component 20, and the first DC signal can be used to characterize the second DC voltage Vrec2, that is, it can characterize the first DC voltage Vrec1. By comparing the first reference signal Vref and the first DC signal by the comparator U1, it can be known whether the first DC voltage Vrec1 exceeds the upper voltage limit of the energy storage component 20. If it exceeds, the comparator U1 outputs a low level to turn off the switch tube Q1, so that the energy storage component 20 and the first rectifier unit 11 are isolated, which plays a role in protecting the energy storage component 20; if it does not exceed, the comparator U1 outputs a high level to turn on the switch tube Q1, so that the energy storage component 20 and the first rectifier unit 11 are connected, and the energy storage component 20 is charged and discharged normally. Through the above technical means, without connecting multiple energy storage components 20 in series or using high-voltage energy storage components 20, the energy storage component 20 can be made to bear the first DC voltage Vrec1 in excess, that is, to bear the AC voltage Vac in excess, thereby reducing the volume and cost of the rectifier and filter circuit.

[0114] Please refer to Figure 5As a specific implementation, the switch control module 30 further includes a third resistive unit R3, a fourth resistive unit R4, and a fifth resistive unit R5;

[0115] A first end of the third resistive unit R3 is connected to the first reference signal Vref, and a second end of the third resistive unit R3 is respectively connected to the in-phase input end of the comparator U1, a first end of the fourth resistive unit R4, and a first end of the fifth resistive unit R5;

[0116] The second end of the fourth resistive unit R4 is connected to the output end of the comparator U1;

[0117] The second end of the fifth resistive unit R5 is grounded;

[0118] The third resistive unit R3, the fourth resistive unit R4, and the fifth resistive unit R5 are used together to divide the first reference signal Vref and to make the comparator U1 a hysteresis comparator, which has the beneficial effect of leaving a certain voltage margin when the comparator U1 compares the first reference signal Vref with the first DC signal, so that the comparator U1 will not be triggered by mistake. The specific principle is that when the first DC signal is less than the first reference signal Vref, the comparator U1 outputs a high level, and at this time, the voltage at the non-inverting input terminal of the comparator U1 is:

[0119]

[0120] Among them, V+(1) is used to represent the voltage at the non-inverting input terminal of the comparator U1 when the comparator U1 outputs a high level; Vref is used to represent the first reference signal Vref; R3, R4, and R5 are used to represent the third resistive unit, the fourth resistive unit, and the fifth resistive unit, respectively; VO is used to represent the high level output by the comparator U1.

[0121] When the first DC signal is greater than the first reference signal Vref, the comparator U1 outputs a low level. At this time, the voltage at the non-inverting input terminal of the comparator U1 is:

[0122]

[0123] Wherein, V+(-) is used to represent the voltage at the non-inverting input terminal of the comparator U1 when the comparator U1 outputs a low level.

[0124] It can be seen from the above formula that when the comparator U1 needs to output a high level after outputting a low level, the voltage at its non-inverting input terminal has a certain voltage margin to ensure that the comparator U1 will not be falsely triggered due to additional fluctuations in the first DC signal.

[0125] Please refer to Figure 5 As a specific implementation, the switch control module 30 further includes a sixth resistive unit R6; the sixth resistive unit R6 is connected between the output end of the comparator U1 and the gate of the switch tube Q1.

[0126] Please refer to Figure 6 As a specific implementation, the surge protection module 40 includes a seventh resistive unit R7 and a first transistor Q2;

[0127] The first end of the seventh resistive unit R7 is respectively connected to the first end of the switch tube Q1 and the base of the first transistor Q2, and the second end thereof is respectively connected to the second end or the first end of the first rectifying unit 11 and the first end of the first transistor Q2;

[0128] The second end of the first transistor Q2 is connected to the gate of the switch tube Q1; wherein, if the current flowing through the sixth resistive unit R6 exceeds the first threshold value, the first transistor Q2 is turned on, so that the current flowing through the sixth resistive unit R6 is clamped within the first threshold value. Specifically: during the conduction process of the switch tube Q1, a current will flow through the switch tube Q1. When the current flowing through the seventh resistive unit R7 exceeds the first threshold value, the voltage drop formed by the seventh resistive unit R7 will turn on the first transistor Q2, so that the switch tube Q1 works in an amplified state, so that the switch tube Q1 is prevented from being damaged due to overcurrent; wherein the size of the first threshold value can be adjusted according to actual needs, and is not limited here. Wherein, the surge protection module 40 also includes an eighth resistive unit R8, and the eighth resistive unit R8 is connected between the first end of the switch tube Q1 and the base of the first transistor Q2 to limit the current flowing into the first transistor Q2, thereby protecting the first transistor Q2.

[0129] As a specific implementation, the first resistance unit R1 to the eighth resistance unit R8 specifically include a resistor network, wherein the resistor network is a plurality of resistors connected in series and in parallel. Of course, the first resistance unit R1 to the eighth resistance unit R8 may also be just a single resistor, which is not limited here.

[0130] Example 2

[0131] Please refer to Figure 7The rectifier module 10 provided in Embodiment 1 includes a first rectifier unit 11 and a second rectifier unit 12; the first end of the first rectifier unit 11 serves as the first end of the rectifier module 10, and the second end of the first rectifier unit 11 and the second end of the second rectifier unit 12 serve as the second end of the rectifier module 10; the first rectifier unit 11 and the second rectifier unit 12 are both used to rectify the input AC voltage Vac, and output the first DC voltage Vrec1 and the second DC voltage Vrec2 from their respective first ends respectively;

[0132] The energy storage component 20 is coupled between the first end and the second end of the first rectifying unit 11;

[0133] The switch tube Q1 is coupled between the energy storage component 20 and the first end of the first rectifying unit 11;

[0134] The switch control module 30 is coupled between the first end of the second rectifier unit 12 and the gate of the switch tube Q1;

[0135] The surge protection module 40 is coupled between the switch tube Q1 and the first end of the first rectifying unit 11 .

[0136] The difference between the above-mentioned embodiment 2 and embodiment 1 is that the switch tube Q1 and the surge protection module 40 of embodiment 2 are at the high end of the rectifier and filter circuit, while the switch tube Q1 and the surge protection module 40 of embodiment 1 are at the low end of the rectifier and filter circuit. The specific structures of the first rectifier unit 11 and the second rectifier unit 12, the energy storage component 20, the switch tube Q1, the switch control module 30, and the surge protection module 40 in embodiment 2 are consistent with those in embodiment 1 and will not be repeated here. However, considering the practicality, it is also necessary to add a driving circuit between the gate and source of the switch tube Q1 in embodiment 2 to improve the driving ability of the switch tube Q1.

[0137] Example 3

[0138] Please refer to Figure 8 The rectifier module 10 provided in Embodiment 3 includes a first rectifier unit 11; the first end of the first rectifier unit 11 serves as the first end of the rectifier module 10, and the second end of the first rectifier unit 11 serves as the second end of the rectifier module 10; the first rectifier unit 11 is used to rectify the input AC voltage Vac and output the first DC voltage Vrec1 from the first end;

[0139] The energy storage component 20 is coupled between the first end and the second end of the first rectifying unit 11;

[0140] The switch tube Q1 is coupled between the energy storage component 20 and the second end of the first rectifying unit 11;

[0141] The switch control module 30 is coupled between the first end of the first rectifier unit 11 and the gate of the switch tube Q1; wherein the first DC voltage Vrec1 is the same as the second DC voltage Vrec2;

[0142] The surge protection module 40 is coupled between the switch tube Q1 and the second end of the first rectifier unit 11;

[0143] The rectifying and filtering circuit further includes a first diode unit 50 ; the anode of the first diode unit 50 is coupled to the first end of the rectifying module 10 ; the cathode of the first diode unit 50 is coupled to the first end of the energy storage component 20 .

[0144] As a specific implementation, the switch control module 30 includes a first resistive unit R1, a second resistive unit R2, and a comparator U1;

[0145] The first end of the first resistive unit R1 is connected to the first end of the first rectifying unit 11 , and the second end thereof is respectively connected to the inverting input end of the comparator U1 and the first end of the second resistive unit R2 ; the second end of the second resistive unit R2 is grounded.

[0146] As a specific implementation, the first diode unit 50 specifically includes a seventh diode D7 . The first diode unit 50 functions to separate the first DC voltage Vrec1 from the voltage across the energy storage component 20 .

[0147] The difference between Example 3 and Example 1 is that in Example 1, the first DC voltage Vrec1 output by the first rectifier unit 11 is used as a power voltage for supplying energy to the energy storage component 20, and the second DC voltage Vrec2 output by the second rectifier unit 12 is used as a signal voltage for comparison with the first reference signal Vref. In Example 3, the first DC voltage Vrec1 output by the first rectifier unit 11 is used as both a power voltage for supplying energy to the energy storage component 20 and a signal voltage for comparison with the first reference signal Vref; therefore, the first diode unit 50 is required to separate the first DC voltage Vrec1 from the voltage at both ends of the energy storage component 20. The specific structures of the first rectifier unit 11, the energy storage component 20, the switch tube Q1, the switch control module 30, and the surge protection module 40 in Example 3 are consistent with those in Example 1, and are not repeated here.

[0148] Example 4

[0149] The rectifier module 10 provided in Embodiment 4 includes a first rectifier unit 11; a first end of the first rectifier unit 11 serves as a first end of the rectifier module 10, and a second end thereof serves as a second end of the rectifier module 10; the first rectifier unit 11 is used to rectify the input AC voltage Vac and output the first DC voltage Vrec1 from the first end;

[0150] The energy storage component 20; the energy storage component 20 is coupled between the first end and the second end of the first rectifier unit 11;

[0151] The switch tube Q1 is coupled between the energy storage component 20 and the first end of the first rectifying unit 11;

[0152] The switch control module 30 is coupled between the first end of the first rectifier unit 11 and the gate of the switch tube Q1; wherein the first DC voltage Vrec1 is the same as the second DC voltage Vrec2;

[0153] The surge protection module 40 is coupled between the switch tube Q1 and the first end of the first rectifier unit 11; the rectifier filter circuit also includes a first diode unit 50; the positive pole of the first diode unit 50 is coupled to the first end of the rectifier module 10; the negative pole of the first diode unit 50 is coupled to the first end of the energy storage component 20.

[0154] The difference between Example 4 and Example 3 is the same as the difference between Example 2 and Example 1, and will not be repeated here. Figure 7 .

[0155] An embodiment of the present invention further provides an electronic circuit, comprising the rectifier and filter circuit provided in the above embodiments and optional embodiments of the present invention.

[0156] An embodiment of the present invention further provides an electronic device, comprising the electronic circuit.

[0157] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A rectifier and filter circuit for rectifying and filtering an AC voltage, characterized in that: The circuit includes: a rectifier module, configured to input the AC voltage, rectify the AC voltage, and output a first DC voltage from a first end thereof; An energy storage component is coupled between the first end and the second end of the rectifier module; the energy storage component is used to store energy under the action of the first DC voltage; wherein the second end of the rectifier module is grounded; A switch tube, coupled between the energy storage component and the rectifier module; the switch tube is used to control the connection and isolation between the rectifier module and the energy storage component; A switch control module, coupled to the gate of the switch tube; the switch control module is used to compare the first DC signal with the first reference signal, and control the on and off of the switch tube according to the comparison result; wherein the first DC signal is positively correlated with the second DC voltage; the first DC voltage is positively correlated with the second DC voltage; the first reference signal is positively correlated with the withstand voltage upper limit of the energy storage component; An anti-surge module, coupled between the switch tube and the rectifier module; the anti-surge module is used to clamp the current flowing through the switch tube within a first threshold; The rectifier module includes a first rectifier unit and a second rectifier unit; the first end of the first rectifier unit serves as the first end of the rectifier module, and the second end of the first rectifier unit and the second end of the second rectifier unit both serve as the second end of the rectifier module; the first rectifier unit and the second rectifier unit are both used to rectify the input AC voltage, and output the first DC voltage and the second DC voltage from their respective first ends respectively; The energy storage component is coupled between the first end and the second end of the first rectifier unit; The switch tube is coupled between the energy storage component and the second end of the first rectifier unit; The switch control module is coupled between the first end of the second rectifier unit and the gate of the switch tube; The surge protection module is coupled between the switch tube and the second end of the first rectifier unit; The switch control module includes a first resistive unit, a second resistive unit, and a comparator; The first end of the first resistive unit is connected to the first end of the second rectifying unit, and the second end thereof is respectively connected to the inverting input end of the comparator and the first end of the second resistive unit; the second end of the second resistive unit is grounded; the first resistive unit and the second resistive unit are used together to divide the second DC voltage, and output the first DC signal from the second end of the first resistive unit to the inverting input end of the comparator; The first reference signal is input to the non-inverting input terminal of the comparator; The comparator is used to compare the first reference signal and the first DC signal; if the first reference signal is greater than the first DC signal, the comparator outputs a high level to the gate of the switch tube to turn on the switch tube; if the first reference signal is less than the first DC signal, the comparator outputs a low level to the gate of the switch tube to turn off the switch tube.

2. The rectifier and filter circuit according to claim 1, characterized in that: The rectifier module includes a first rectifier unit and a second rectifier unit; the first end of the first rectifier unit serves as the first end of the rectifier module, and the second end of the first rectifier unit and the second end of the second rectifier unit both serve as the second end of the rectifier module; the first rectifier unit and the second rectifier unit are both used to rectify the input AC voltage, and output the first DC voltage and the second DC voltage from their respective first ends respectively; The energy storage component is coupled between the first end and the second end of the first rectifier unit; The switch tube is coupled between the energy storage component and the first end of the first rectifier unit; The switch control module is coupled between the first end of the second rectifier unit and the gate of the switch tube; The surge protection module is coupled between the switch tube and the first end of the first rectifying unit.

3. The rectifier and filter circuit according to claim 1, characterized in that: The switch control module further includes a third resistive unit, a fourth resistive unit, and a fifth resistive unit; The first end of the third resistive unit is connected to the first reference signal, and the second end of the third resistive unit is respectively connected to the in-phase input end of the comparator, the first end of the fourth resistive unit, and the first end of the fifth resistive unit; The second end of the fourth resistive unit is connected to the output end of the comparator; The second end of the fifth resistive unit is grounded; The third resistive unit, the fourth resistive unit and the fifth resistive unit are used together to divide the voltage of the first reference signal and to make the comparator a hysteresis comparator.

4. The rectifier and filter circuit according to claim 3, characterized in that: The switch control module further includes a sixth resistive unit; The sixth resistive unit is connected between the output terminal of the comparator and the gate of the switch tube.

5. The rectifier and filter circuit according to claim 4, characterized in that: The surge protection module includes a seventh resistive unit and a first transistor; The first end of the seventh resistive unit is respectively connected to the first end of the switch tube and the base of the first transistor, and the second end of the seventh resistive unit is respectively connected to the second end or the first end of the first rectifying unit and the first end of the first transistor; The second terminal of the first transistor is connected to the gate of the switch tube; If the current flowing through the sixth resistive unit exceeds the first threshold, the first transistor is turned on, so that the current flowing through the sixth resistive unit is clamped within the first threshold.

6. The rectifier and filter circuit according to claim 5, characterized in that: The surge protection module further includes an eighth resistive unit; The eighth resistive unit is connected between the first end of the switch tube and the base of the first transistor.

7. The rectifier and filter circuit according to claim 6, characterized in that: Specifically, the first resistive unit to the eighth resistive unit all include a resistor network.

8. The rectifier and filter circuit according to claim 1, characterized in that: The rectifier module includes a first rectifier unit; the first end of the first rectifier unit serves as the first end of the rectifier module, and the second end of the first rectifier unit serves as the second end of the rectifier module; the first rectifier unit is used to rectify the input AC voltage and output the first DC voltage from the first end; The energy storage component is coupled between the first end and the second end of the first rectifier unit; The switch tube is coupled between the energy storage component and the second end of the first rectifier unit; The switch control module is coupled between the first end of the first rectifier unit and the gate of the switch tube; wherein the first DC voltage is the same as the second DC voltage; The surge protection module is coupled between the switch tube and the second end of the first rectifier unit; The rectification and filtering circuit also includes a first diode unit; the anode of the first diode unit is coupled to the first end of the rectification module; the cathode of the first diode unit is coupled to the first end of the energy storage component.

9. The rectifier and filter circuit according to claim 1, characterized in that: The rectifier module includes a first rectifier unit; the first end of the first rectifier unit serves as the first end of the rectifier module, and the second end of the first rectifier unit serves as the second end of the rectifier module; the first rectifier unit is used to rectify the input AC voltage and output the first DC voltage from the first end; The energy storage component is coupled between the first end and the second end of the first rectifier unit; The switch tube is coupled between the energy storage component and the first end of the first rectifier unit; The switch control module is coupled between the first end of the first rectifier unit and the gate of the switch tube; wherein the first DC voltage is the same as the second DC voltage; The surge protection module is coupled between the switch tube and the first end of the first rectifier unit; The rectification and filtering circuit also includes a first diode unit; the anode of the first diode unit is coupled to the first end of the rectification module; the cathode of the first diode unit is coupled to the first end of the energy storage component.

10. The rectifier and filter circuit according to claim 8 or 9, characterized in that: The switch control module includes a first resistive unit, a second resistive unit, and a comparator; The first end of the first resistive unit is connected to the first end of the first rectifying unit, and the second end thereof is respectively connected to the inverting input end of the comparator and the first end of the second resistive unit; the second end of the second resistive unit is grounded.

11. The rectifier and filter circuit according to claim 10, characterized in that: The first diode unit specifically includes a first diode.

12. An electronic circuit, characterized in that: The rectifier and filter circuit comprises the rectifier and filter circuit according to any one of claims 1 to 11.

13. An electronic device, characterized in that: Comprising the electronic circuit of claim 12.

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