Delay protection circuit of AC-AC voltage stabilizer

Abstract

The utility model relates to the technical field of delay protection, and discloses a delay protection circuit of an AC-AC voltage stabilizer, which comprises a mains supply end, a sampling module, a delay regulation and control module, an AC voltage stabilization module and a control module. The mains supply end outputs mains supply voltage, the mains supply voltage is sampled through the sampling module to obtain a sampling voltage signal, the control module outputs a power supply signal to the delay regulation and control module in a delayed mode according to the sampling voltage signal, and the delay regulation and control module receives the delayed power supply signal and conducts a circuit loop between the mains supply end and the alternating current voltage stabilization module. The alternating-current voltage stabilizing module can supply stable alternating-current power supply voltage to electrical equipment, so that the electrical equipment is prevented from being damaged due to overlarge impact current voltage caused by frequent on-off of an input power supply, and the electrical equipment is ensured to operate stably and safely.

Description

Technical Field

[0001] The utility model relates to the technical field of time-delay protection, in particular to a time-delay protection circuit of an AC-AC voltage stabilizer. Background Art

[0002] When the input power is frequently turned on and off, it will cause a variety of adverse effects on electrical equipment. For example, frequent switching operations will increase the wear of the equipment when it starts and stops, especially damage to components such as motors and converters, which will accelerate the aging of the equipment and shorten its service life; frequent on and off may cause data loss, setting reset or other failures; for devices with self-protection functions, such as overheat protection, overcurrent protection, etc., their frequent on and off may cause these protection mechanisms to fail, increasing the risk of equipment damage.

[0003] In the prior art, the input power is frequently turned on and off, which will supply a large current and voltage in a short period of time, impacting the electrical equipment, resulting in lower stability and safety of the electrical equipment, making it difficult to ensure stable and safe operation of the equipment. Utility Model Content

[0004] The purpose of the utility model is to provide a time-delay protection circuit for an AC-AC voltage stabilizer to solve one or more technical problems existing in the prior art and at least provide a beneficial choice or create conditions.

[0005] The utility model solves the technical problem by providing a time-delay protection circuit for an AC-AC voltage stabilizer, comprising:

[0006] A mains power supply terminal, the mains power supply terminal is used to output a mains voltage;

[0007] A sampling module, wherein the input end of the sampling module is connected to the mains power supply end, and the sampling module is used to sample the mains voltage to obtain a sampled voltage signal;

[0008] A delay control module, the input end of which is connected to the mains power supply end, and the delay control module is used to receive a delayed power supply signal to delay the output of the mains voltage;

[0009] An AC voltage stabilizing module, wherein the input end of the AC voltage stabilizing module is connected to the output end of the delay control module, the output end of the AC voltage stabilizing module is connected to an external load, and the AC voltage stabilizing module is used to receive the delayed input mains voltage, stabilize the mains voltage, and output an AC power supply voltage to the external load;

[0010] A control module is connected to the output end of the sampling module, the input end of the delay control module and the input end of the AC voltage stabilization module. The control module receives the sampled voltage signal and outputs the power supply signal with a delay.

[0011] Furthermore, the delay control module includes:

[0012] A triode circuit, wherein an input end of the triode circuit is connected to a control module;

[0013] A relay, wherein the normally open end of the relay is connected to the input end of the AC voltage stabilizing module, the common end of the relay is connected to the mains power supply end, and the driving end of the relay is connected to the output end of the triode circuit.

[0014] Furthermore, the AC voltage stabilization module includes:

[0015] A filter resonant circuit, wherein an input end of the filter resonant circuit is connected to a normally open end of a relay;

[0016] A PFC boost circuit, wherein the input end of the PFC boost circuit is respectively connected to the output end of the filter resonant circuit and the control module, and the PFC boost circuit is used to receive the delayed input mains voltage and output a DC voltage;

[0017] An inverter circuit, wherein the input end of the inverter circuit is respectively connected to the output end of the PFC boost circuit and the control module, the output end of the inverter circuit is connected to the external load through a filter resonant circuit, and the inverter circuit is used to receive the DC voltage and output the AC power supply voltage.

[0018] Furthermore, a time delay protection circuit of an AC-AC voltage stabilizer further includes: a pre-charging module;

[0019] The input end of the pre-charging module is connected to the normally closed switch of the relay, and the output end of the pre-charging module is connected to the output end of the PFC boost circuit.

[0020] Furthermore, a time delay protection circuit of an AC-AC voltage stabilizer further includes: a monitoring module;

[0021] The input end of the monitoring module is respectively connected to the common end of the relay, the output end of the PFC boost circuit and the output end of the inverter circuit, and the output end of the monitoring module is connected to the control module. The monitoring module is used to monitor the mains voltage and the DC voltage.

[0022] Further, the pre-charging module comprises:

[0023] A current limiting resistor connected to a normally closed terminal of the relay;

[0024] A thyristor, wherein an anode of the thyristor is connected to a current limiting resistor, and a cathode of the thyristor is connected to an output end of a PFC boost circuit;

[0025] An energy storage capacitor, wherein the positive electrode of the energy storage capacitor is respectively connected to the cathode of the thyristor and the output end of the PFC boost circuit, and the negative electrode of the energy storage capacitor is connected to the ground end.

[0026] Further, the monitoring module includes: a mains power monitoring circuit;

[0027] The input end of the mains monitoring circuit is connected to the common end of the relay, the output end of the mains monitoring circuit is connected to the control module, and the mains monitoring circuit is used to monitor the mains voltage.

[0028] Further, the monitoring module also includes: a BUS voltage monitoring circuit;

[0029] The input end of the BUS voltage monitoring circuit is connected to the output end of the PFC boost circuit, the output end of the BUS voltage monitoring circuit is connected to the control module, and the BUS voltage monitoring circuit is used to monitor the DC voltage.

[0030] Furthermore, the BUS voltage monitoring circuit includes: a sampling resistor group; one end of the sampling resistor group is connected to the output end of the PFC boost circuit, and the other end of the sampling resistor group is connected to the control module.

[0031] Furthermore, a delay protection circuit of an AC-AC voltage stabilizer further includes: a delay switch; the delay switch is connected to the control module, and the delay switch is used to output a delay signal so that the control module delays output of the power supply signal.

[0032] The beneficial effects of the utility model are as follows: the AC power supply end outputs the AC power voltage, the AC power voltage is sampled by the sampling module to obtain a sampled voltage signal, the control module delays the output of the power supply signal to the delay control module according to the sampled voltage signal, the delay control module receives the delayed power supply signal, and switches on the circuit loop between the AC power supply end and the AC voltage stabilizing module to realize the delayed input of the AC power voltage to the input end of the AC voltage stabilizing module, so that the AC voltage stabilizing module can supply a stable AC power supply voltage to the electrical equipment to prevent the input power from being frequently turned on and off, resulting in excessive impact current and voltage, causing damage to the electrical equipment, thereby ensuring that the electrical equipment can operate stably and safely. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 It is a partial circuit diagram of a time delay protection circuit of an AC-AC voltage stabilizer provided by an embodiment of the utility model;

[0034] Figure 2 It is a partial circuit diagram of a time delay protection circuit of an AC-AC voltage stabilizer provided by another embodiment of the utility model;

[0035] Figure 3It is a partial circuit diagram of a time delay protection circuit of an AC-AC voltage stabilizer provided by another embodiment of the utility model. DETAILED DESCRIPTION

[0036] In order to make the purpose, technical solution and advantages of the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and cannot be understood as limiting the present utility model.

[0037] It should be noted that although the functional module division is performed in the schematic diagram, in some cases, the module division can be different from that in the system.

[0038] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, the features defined as "first" and "second" may explicitly or implicitly include one or more features.

[0039] In the description of the present invention, it should be noted that, unless otherwise clearly defined, terms such as setting, installing, connecting, etc. should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in the present invention in combination with the specific content of the technical solution.

[0040] Reference Figure 1 In some embodiments of the present invention, a delay protection circuit of an AC-AC voltage regulator includes: a mains power supply terminal 500, a sampling module 300, a delay control module 100, an AC voltage stabilization module 200 and a control module 400.

[0041] The mains power supply terminal 500 can supply the mains voltage, the mains power supply terminal 500 is electrically connected to the input terminal of the sampling module 300, and the output terminal of the sampling module 300 is electrically connected to the control module 400. The sampling module 300 samples the mains voltage, obtains a sampled voltage signal, and sends the sampled voltage signal to the control module 400.

[0042] The control module 400 receives the sampled voltage signal, and sends the power supply signal with a delay according to the sampled voltage signal.

[0043] The input end of the delay control module 100 is electrically connected to the mains power supply end 500, the input end of the delay control module 100 is also electrically connected to the control module 400, and the output end of the delay control module 100 is electrically connected to the AC voltage stabilizing module 200. The delay control module 100 can receive a delayed power supply signal, and through the power supply signal, the circuit between the mains power supply end 500 and the AC voltage stabilizing module 200 is turned on, and the mains voltage supplied by the mains power supply end 500 can be output to the AC voltage stabilizing module 200 with a delay.

[0044] The input end of the AC voltage stabilizing module 200 is electrically connected to the delay control module 100, and the output end of the AC voltage stabilizing module 200 is connected to the external load end. The AC voltage stabilizing module 200 can receive the delayed mains voltage, stabilize the mains voltage, and supply a stable AC power supply voltage to the external load. The stable AC power supply voltage is a pure sine wave AC.

[0045] In one embodiment, the sampling module 300 sends a sampled voltage signal to the control module 400. When the sampled mains voltage is greater than the set first voltage threshold, that is, the sampled voltage signal is greater than the set first voltage threshold, the control module 400 delays sending a power supply signal to the delay control module 100. The delay control module 100 conducts the loop between the mains power supply terminal 500 and the AC voltage stabilizing module 200, so that the mains voltage is delayed by the set time threshold and then input into the AC voltage stabilizing module 200. Among them, the set first voltage threshold can be 70V, and the set time threshold can be three minutes.

[0046] In one embodiment, the sampling module 300 sends a sampled voltage signal to the control module 400. When the sampled mains voltage is less than the set second voltage threshold, that is, when the sampled voltage signal is less than the set second voltage threshold, the control module 400 sends a power-off signal to the delay control module 100, and the delay control module 100 disconnects the circuit between the mains power supply terminal 500 and the AC voltage stabilizing module 200, so that the mains voltage stops being supplied to the AC voltage stabilizing module 200. The set second voltage threshold is 65V.

[0047] In the above embodiment, the specific values ​​of the voltage threshold and the time threshold can be set to other values ​​according to actual applications, and the specific values ​​of the voltage threshold and the time threshold are not specifically limited in this embodiment.

[0048] In the scheme of the above embodiment, the AC power supply terminal 500 outputs the AC power voltage, and the AC power voltage is sampled through the sampling module 300 to obtain a sampled voltage signal. The control module 400 delays the output of the power supply signal to the delay control module 100 according to the sampled voltage signal. The delay control module 100 receives the delayed power supply signal and switches on the circuit loop between the AC power supply terminal 500 and the AC voltage stabilizing module 200 to realize the delayed input of the AC power voltage to the input end of the AC voltage stabilizing module 200. The AC voltage stabilizing module 200 can supply a stable AC power supply voltage to the electrical equipment to prevent the input power from being frequently switched on and off, resulting in excessive impact current and voltage, causing damage to the electrical equipment, thereby ensuring that the electrical equipment can operate stably and safely.

[0049] Reference Figure 1 In some embodiments of the present invention, the delay control module 100 includes: a transistor circuit 110 and a relay K1.

[0050] The input end of the transistor circuit 110 is electrically connected to the control module 400 , the output end of the transistor circuit 110 is electrically connected to the driving end of the relay K1 , and the normally open end of the relay K1 is electrically connected to the input end of the AC voltage stabilizing module 200 .

[0051] The transistor circuit 110 includes a transistor Q1 , a third resistor R3 and a first diode D1 .

[0052] The third resistor R3 is electrically connected to the base of the transistor Q1 and the control module 400 respectively, the emitter of the transistor Q1 is grounded, the collector of the transistor Q1 is electrically connected to the anode of the first diode D1 and the driving end of the relay K1 respectively. The driving end of the relay K1 is also electrically connected to the cathode of the first diode D1.

[0053] In one embodiment, the control module 400 delays sending a power supply signal to the transistor Q1 through the third resistor R3, the transistor Q1 is turned on, the driving end of the relay K1 is powered, the switch of the relay K1 is turned to the normally open end, the loop of the mains power supply end 500 and the AC voltage stabilizing module 200 is turned on, so that the mains voltage is delayed by the set time threshold and then input into the AC voltage stabilizing module 200. The set time threshold can be three minutes.

[0054] In one embodiment, the control module 400 sends a power-off signal to the transistor Q1 through the third resistor R3, the transistor Q1 is cut off, the driving end of the relay K1 loses power, the switch of the relay K1 is turned to the normally closed end, and the circuit between the AC power supply end 500 and the AC voltage stabilizing module 200 is disconnected, so that the AC power voltage is no longer input into the AC voltage stabilizing module 200.

[0055] By connecting the transistor circuit 110 and the relay K1 with the control module 400, the circuit loop between the AC power supply terminal 500 and the AC voltage stabilizing module 200 is opened and closed to realize the delayed input of the AC voltage to the input terminal of the AC voltage stabilizing module 200. The AC voltage stabilizing module 200 can supply a stable AC power supply voltage to the electrical equipment to prevent the input power from being frequently connected and disconnected, resulting in excessive impact current and voltage, causing damage to the electrical equipment, thereby ensuring that the electrical equipment can operate stably and safely.

[0056] Reference Figures 1 to 3 In some embodiments of the present invention, the AC voltage stabilizing module 200 includes: a filter resonant circuit 210 , a PFC boost circuit 220 and an inverter circuit 230 .

[0057] An input end of the filter resonant circuit 210 is electrically connected to a normally open end of the relay K1 , and an output end of the filter resonant circuit 210 is electrically connected to an input end of the PFC boost circuit 220 .

[0058] The input end of the inverter circuit 230 is electrically connected to the output end of the PFC boost circuit 220, the output end of the inverter circuit 230 is electrically connected to the input end of the filter resonant circuit 210, and the output end of the filter resonant circuit 210 is electrically connected to the external load, so that the inverter circuit 230 is electrically connected to the external load through the filter resonant circuit 210. The control module 400 is electrically connected to the input end of the PFC boost circuit 220 and the input end of the inverter circuit 230, respectively.

[0059] The filter resonant circuit 210 can filter and resonate the mains voltage input from the mains power supply terminal 500, reduce circuit impedance and remove clutter. The filter resonant circuit 210 includes: a first inductor group L1, a fifth capacitor C5, a sixth capacitor C6 and a seventh capacitor C7.

[0060] One end of the fifth capacitor C5 is electrically connected to the normally open end of the relay K1 and the first inductor group L1, respectively, and the other end of the fifth capacitor C5 is electrically connected to the negative terminal (I / PN) of the mains power supply terminal 500 and the first inductor group L1. One end of the sixth capacitor C6 is electrically connected to the negative terminal (I / PN) of the mains power supply terminal 500, the other end of the fifth capacitor C5 and the first inductor group L1, respectively, and the other end of the sixth capacitor C6 is electrically connected to the external load and the first inductor group L1, respectively.

[0061] One end of the seventh capacitor C7 is electrically connected to the first inductor group L1 and the input end of the PFC boost circuit 220 , and the other end of the seventh capacitor C7 is electrically connected to the first inductor group L1 and the output end of the inverter circuit 230 .

[0062] The PFC boost circuit 220 can receive the delayed mains voltage, process the mains voltage, and output a DC voltage. The PFC boost circuit 220 improves the power factor so that the power factor is controlled above 0.98. The DC voltage is 400V.

[0063] The PFC boost circuit 220 includes: a PFC current sampler DA2, a third inductor L3, a first IGBT power tube VT1 and a second IGBT power tube VT2.

[0064] The input end of the PFC current sampler DA2 is connected to the output end of the filter resonant circuit 210, and the input end of the PFC current sampler DA2 is also electrically connected to the control module 400. The output end of the PFC current sampler DA2 is electrically connected to the collector of the second IGBT power tube VT2 and the emitter of the first IGBT power tube VT1 through the third inductor L3.

[0065] The gate of the first IGBT power tube VT1 and the gate of the second IGBT power are both electrically connected to the control module 400 , the emitter of the second IGBT power is grounded, and the collector of the first IGBT power tube VT1 is electrically connected to the input end of the inverter circuit 230 .

[0066] The PFC current sampler DA2 samples the PFC current to obtain a PFC current sampling signal, and outputs the PFC current sampling signal to the control module 400 to monitor the PFC boost circuit 220 .

[0067] The inverter circuit 230 receives the DC voltage, transforms the DC voltage, and outputs a pure sinusoidal AC power supply voltage to an external load.

[0068] The inverter circuit 230 includes: a third IGBT power tube VT3, a fourth IGBT power tube VT4, a fifth IGBT power tube VT5, a sixth IGBT power tube VT6, an inverter current sampler DA1, a ninth capacitor C9, and a second inductor L2.

[0069] The collector of the fifth IGBT power tube VT5 is electrically connected to the collector of the first IGBT power tube VT1 and the collector of the third IGBT power tube VT3 respectively.

[0070] The emitter of the fifth IGBT power tube VT5 is electrically connected to one end of the second inductor L2 and the collector of the sixth IGBT power tube VT6, the emitter of the sixth IGBT power tube VT6 is electrically connected to the emitter of the fourth IGBT power tube VT4, and the collector of the fourth IGBT power tube VT4 is electrically connected to one end of the ninth capacitor C9, the first inductor group L1, the inverter current sampler DA1 and the emitter of the third IGBT power tube VT3.

[0071] The gates of the third IGBT power tube VT3 , the fourth IGBT power tube VT4 , the fifth IGBT power tube VT5 , and the sixth IGBT power tube VT6 are all electrically connected to the control module 400 .

[0072] The other end of the second inductor L2 is connected to the inverter current sampler DA1 , and the inverter current sampler DA1 is connected to the other end of the ninth capacitor C9 and the first inductor group L1 respectively.

[0073] The inverter current sampler DA1 samples the inverter current to obtain an inverter current sampling signal, and outputs the sampling signal to the control module 400 to monitor the inverter circuit 230 .

[0074] It should be noted that Figure 2The delay control module 100 in the figure represents that the circuit provided in the module is electrically connected to the mains power supply terminal 500 and the AC voltage stabilizing module 200, and the power supply voltage output by the AC voltage stabilizing module 200 can be outputted without passing through the delay control module 100.

[0075] Reference Figure 1 to Figure 2 In some embodiments of the present invention, the delay protection circuit further includes: a pre-charging module 600 and a delay switch S1.

[0076] Reference Figure 1 The delay switch S1 is electrically connected to the control module 400. The delay switch S1 can respond to user instructions and send a delay signal to the control module 400 to enable the control module 400 to delay output of the power supply signal. In other words, the user can select the delay through the delay switch S1.

[0077] In one embodiment, when the delay switch S1 is closed and the sampled voltage signal is greater than the set first threshold, the control module 400 delays sending the power supply signal to the delay control module 100, and the delay control module 100 turns on the loop between the AC power supply terminal 500 and the AC voltage stabilizing module 200.

[0078] Reference Figure 2 The input end of the pre-charging module 600 is connected to the normally closed end of the relay K1 , and the output end of the pre-charging module 600 is electrically connected to the output end of the PFC boost circuit 220 .

[0079] The pre-charging module 600 is used to receive the mains voltage, store the mains voltage, and obtain the stored voltage. In this embodiment, after the power supply device is powered on, the pre-charging module 600 will be charged first through the normally closed end of the relay K1 in the delay control module 100. The mains voltage gradually increases, and when the mains voltage is greater than the set first threshold, the mains voltage is supplied to the AC voltage stabilization module 200 through the delay control module 100.

[0080] The pre-charging module 600 includes: a current limiting resistor R14, a thyristor VS1, an energy storage capacitor C8, a second diode D2, a third diode D3, a series resistor group and a seventeenth resistor R17.

[0081] One end of the current limiting resistor R14 is electrically connected to the normally closed end of the relay K1, and the other end of the current limiting resistor R14 is electrically connected to the anode of the second diode D2. The cathode of the second diode D2 is electrically connected to the anode of the thyristor VS1, so that the current limiting resistor R14 is electrically connected to the anode of the thyristor VS1.

[0082] The cathode of the second diode D2 is also electrically connected to one end of the series resistor group, the other end of the series resistor group is electrically connected to the anode of the third diode D3, and the cathode of the third diode D3 is electrically connected to the control end of the thyristor VS1.

[0083] The cathode of the thyristor VS1 is electrically connected to the positive electrode of the energy storage capacitor C8, and the negative electrode of the energy storage capacitor C8 is grounded. One end of the seventeenth resistor R17 is connected to the cathode of the third diode D3, and the other end of the seventeenth resistor R17 is connected to the cathode of the thyristor VS1.

[0084] The surge current of the input mains is limited by the thyristor VS1 and the current limiting resistor R14 to prevent damage to the circuit.

[0085] Reference Figure 2 and Figure 3 In some embodiments of the present utility model, the delay protection circuit further includes: a monitoring module.

[0086] The input end of the monitoring module is electrically connected to the common end of the relay K1, the input end of the monitoring module is also electrically connected to the output end of the PFC boost circuit 220, and the input end of the monitoring module is also electrically connected to the output end of the inverter circuit 230. The output end of the monitoring module is electrically connected to the control module 400.

[0087] The monitoring module includes: a mains power monitoring circuit 700 , an inverter voltage monitoring circuit 710 and a BUS voltage monitoring circuit 720 .

[0088] The input end of the mains monitoring circuit 700 is electrically connected to the common end of the relay K1, and the output end of the mains monitoring circuit 700 is electrically connected to the control module 400. The mains monitoring circuit 700 is used to monitor and protect the input mains voltage from being too high or too low.

[0089] The mains power monitoring circuit 700 includes: a mains power sampling series resistor group and a first amplifier circuit.

[0090] One end of the AC power sampling series resistor group is electrically connected to the common end of the relay K1 , the other end of the AC power sampling series resistor group is electrically connected to the input end of the first amplifier circuit, and the output end of the first amplifier circuit is electrically connected to the control module 400 .

[0091] The input end of the inverter voltage monitoring circuit 710 is electrically connected to the first inductor group L1, and the output end of the inverter voltage monitoring circuit 710 is electrically connected to the control module 400. The inverter circuit 230 can be monitored and protected by the sampled inverter voltage (O / PV).

[0092] The inverter voltage monitoring circuit 710 includes: an inverter voltage sampling series resistor group and a second amplifier circuit.

[0093] One end of the inverter voltage sampling series resistor group is electrically connected to the first inductor group L1 , the other end of the inverter voltage sampling series resistor group is electrically connected to the input end of the second amplifier circuit, and the output end of the second amplifier circuit is electrically connected to the control module 400 .

[0094] The input end of the BUS voltage monitoring circuit 720 is electrically connected to the output end of the PFC boost circuit 220, and the output end of the BUS voltage monitoring circuit 720 is electrically connected to the control module 400. The PFC boost circuit 220 can monitor and protect the DC voltage (BUS.V) sampled by the BUS voltage monitoring circuit 720.

[0095] The BUS voltage monitoring circuit 720 includes: a sampling resistor group, one end of which is electrically connected to the collector of the first IGBT power tube VT1 , and the other end of which is electrically connected to the control module 400 .

[0096] The sampling resistor group includes: an eighteenth resistor R18 and a nineteenth resistor R19.

[0097] The preferred implementation methods of the utility model are specifically described above, but the invention of the utility model is not limited to the described embodiments. Those skilled in the art can make various equivalent modifications or substitutions without violating the spirit of the utility model. These equivalent modifications or substitutions are all included in the scope defined by the claims of this application.

Claims

1. A time-delay protection circuit for an AC-AC voltage stabilizer, characterized in that: include: A mains power supply terminal, the mains power supply terminal is used to output a mains voltage; A sampling module, wherein the input end of the sampling module is connected to the mains power supply end, and the sampling module is used to sample the mains voltage to obtain a sampled voltage signal; A delay control module, the input end of which is connected to the mains power supply end, and the delay control module is used to receive a delayed power supply signal to delay the output of the mains voltage; An AC voltage stabilizing module, wherein the input end of the AC voltage stabilizing module is connected to the output end of the delay control module, the output end of the AC voltage stabilizing module is connected to an external load, and the AC voltage stabilizing module is used to receive the delayed input mains voltage, stabilize the mains voltage, and output an AC power supply voltage to the external load; A control module is connected to the output end of the sampling module, the input end of the delay control module and the input end of the AC voltage stabilization module. The control module receives the sampled voltage signal and outputs the power supply signal with a delay.

2. The delay protection circuit of an AC-AC voltage regulator according to claim 1, characterized in that: The delay control module includes: A triode circuit, wherein an input end of the triode circuit is connected to a control module; A relay, wherein the normally open end of the relay is connected to the input end of the AC voltage stabilizing module, the common end of the relay is connected to the mains power supply end, and the driving end of the relay is connected to the output end of the triode circuit.

3. The delay protection circuit of an AC-AC voltage regulator according to claim 2, characterized in that: The AC voltage stabilization module comprises: A filter resonant circuit, wherein an input end of the filter resonant circuit is connected to a normally open end of a relay; A PFC boost circuit, wherein the input end of the PFC boost circuit is respectively connected to the output end of the filter resonant circuit and the control module, and the PFC boost circuit is used to receive the delayed input mains voltage and output a DC voltage; An inverter circuit, wherein the input end of the inverter circuit is respectively connected to the output end of the PFC boost circuit and the control module, the output end of the inverter circuit is connected to an external load through a filter resonant circuit, and the inverter circuit is used to receive the DC voltage and output the AC power supply voltage.

4. The delay protection circuit of an AC-AC voltage regulator according to claim 3, characterized in that: Also includes: Pre-charging module; The input end of the pre-charging module is connected to the normally closed switch of the relay, and the output end of the pre-charging module is connected to the output end of the PFC boost circuit.

5. The delay protection circuit of an AC-AC voltage regulator according to claim 3, characterized in that: Also includes: Monitoring module; The input end of the monitoring module is respectively connected to the common end of the relay, the output end of the PFC boost circuit and the output end of the inverter circuit, and the output end of the monitoring module is connected to the control module. The monitoring module is used to monitor the mains voltage and the DC voltage.

6. The delay protection circuit of an AC-AC voltage regulator according to claim 4, characterized in that: The pre-charging module comprises: A current limiting resistor connected to a normally closed terminal of the relay; A thyristor, wherein an anode of the thyristor is connected to a current limiting resistor, and a cathode of the thyristor is connected to an output end of a PFC boost circuit; An energy storage capacitor, wherein the positive electrode of the energy storage capacitor is respectively connected to the cathode of the thyristor and the output end of the PFC boost circuit, and the negative electrode of the energy storage capacitor is connected to the ground end.

7. The delay protection circuit of an AC-AC voltage regulator according to claim 5, characterized in that: The monitoring module comprises: a mains power monitoring circuit; The input end of the mains monitoring circuit is connected to the common end of the relay, the output end of the mains monitoring circuit is connected to the control module, and the mains monitoring circuit is used to monitor the mains voltage.

8. The delay protection circuit of an AC-AC voltage regulator according to claim 5, characterized in that: The monitoring module also includes: a BUS voltage monitoring circuit; The input end of the BUS voltage monitoring circuit is connected to the output end of the PFC boost circuit, the output end of the BUS voltage monitoring circuit is connected to the control module, and the BUS voltage monitoring circuit is used to monitor the DC voltage.

9. The delay protection circuit of an AC-AC voltage regulator according to claim 8, characterized in that: The BUS voltage monitoring circuit comprises: a sampling resistor group; one end of the sampling resistor group is connected to the output end of the PFC boost circuit, and the other end of the sampling resistor group is connected to the control module.

10. The delay protection circuit of an AC-AC voltage regulator according to claim 1, characterized in that: Also includes: Delay switch; The delay switch is connected to the control module, and is used to output a delay signal so that the control module delays output of the power supply signal.

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