Power supply device and magnetic therapy instrument

Abstract

The utility model provides a power supply device and a magnetic therapy instrument, and the power supply device comprises a power input circuit which is used for accessing an external power supply; two ends of the energy storage circuit are respectively connected with the external power supply, the energy storage circuit is charged through the power supply input circuit, and the energy storage circuit is used for supplying power to a load; the discharging circuit is coupled with the power supply input circuit and is connected with the energy storage circuit in parallel; and the discharging circuit is configured to release the voltage stored by the power supply input circuit before the energy storage circuit supplies power to the load. Through the mode, the discharging circuit can release the voltage stored by the power input circuit, so that the withstand voltage of the power supply device is greatly reduced, the stability and the reliability of the power supply device are improved, a power supply device with a high withstand voltage value does not need to be prepared, and the preparation cost of the power supply device is effectively reduced.

Description

Technical Field

[0001] The present application is applied to the technical field of medical devices, and in particular relates to a power supply device and a magnetic therapy device. Background Art

[0002] Currently, most magnetic therapy devices use a power supply that directly boosts the voltage through a transformer winding and charges this high voltage directly to a capacitor. When the capacitor voltage reaches a specified level, it maintains a constant voltage. Upon receiving a stimulation command, the charging control tube is turned off, and the discharge switch between the capacitor and the magnetic stimulation coil is opened. The capacitor voltage falls on the coil, causing it to instantly release a large current, generating an electromagnetic field. By varying the capacitor voltage and the frequency of the discharge switch, pulsed magnetic fields of varying intensities can be generated, resulting in targeted medical treatments.

[0003] However, existing power supplies for magnetic therapy devices often focus solely on rapid charging, ignoring the voltage spikes generated during the shutdown of the charge control tube. These spikes can reduce the reliability of the power supply, while also requiring a very high withstand voltage, increasing the cost of manufacturing. Utility Model Content

[0004] The present application provides a power supply device to solve the problem of poor power supply stability of medical devices after discharge in the prior art.

[0005] To solve the above technical problems, the present application provides a power supply device, including: a power input circuit for connecting to an external power supply; an energy storage circuit, wherein both ends of the energy storage circuit are respectively connected to the external power supply, the energy storage circuit is charged through the power input circuit, and is used to power a load; a discharge circuit, coupled to the power input circuit and connected in parallel with the energy storage circuit; the discharge circuit is configured to release the voltage stored in the power input circuit before the energy storage circuit powers the load.

[0006] Among them, the power input circuit includes: a PFC unit, configured to input a DC signal; a boost unit, connected to the PFC unit; a pre-charged energy storage unit, connected to the boost unit; the boost unit is configured to charge the pre-charged energy storage unit and the energy storage circuit; a discharge circuit, connected to both ends of the pre-charged energy storage unit, and configured to release the voltage stored in the pre-charged energy storage unit before the energy storage circuit supplies power to the load.

[0007] The discharge circuit includes: a first switch, a variable resistor and a discharge unit connected in series, the first switch is also connected to one end of the pre-charged energy storage unit, and the discharge unit is also connected to the other end of the pre-charged energy storage unit.

[0008] Among them, the discharge unit is a transistor, including an input end, an output end and a control end; the input end is connected to one end of the variable resistor, the output end is connected to the other end of the pre-charged energy storage unit, and the control end is used to connect to the control device of the power supply device, and is configured to release the voltage stored in the pre-charged energy storage unit before the energy storage circuit supplies power to the load.

[0009] The power supply device further includes a second switch, which is arranged between the discharge circuit and the energy storage circuit; a diode is coupled to both ends of the second switch, the anode of the diode is coupled to the output end of the second switch, and the cathode of the diode is coupled to the input end of the second switch.

[0010] The power supply device further includes: a filter circuit and a rectifier circuit, which are connected in sequence, the other end of the filter circuit is connected to the external power supply, and the other end of the rectifier circuit is coupled to the PFC unit.

[0011] The power supply device further includes a sampling circuit and a protection circuit, and the sampling circuit and the protection circuit are coupled to the control device.

[0012] The power supply device further includes: a third switch, which is arranged between the energy storage circuit and the load, wherein the third switch is a thyristor.

[0013] Wherein, a filter inductor is provided between the pre-charge energy storage unit and the discharge circuit.

[0014] To solve the above problems, the present application also provides a magnetic therapy device, which includes a power supply device, which is arranged in the magnetic therapy device, and the power supply device is any one of the power supply devices mentioned above.

[0015] The beneficial effect of the present application is that, different from the prior art, the present application sets a discharge circuit coupled to the power input circuit and connected in parallel with the energy storage circuit in the power supply device, and the discharge circuit is configured to release the voltage stored in the power input circuit after the external power supply supplies power to the energy storage circuit through the power input circuit to reach a preset voltage before the energy storage circuit supplies power to the load, thereby greatly reducing the withstand voltage of the power supply device, improving the stability and reliability of the power supply device, and eliminating the need to prepare a power supply device with a high withstand voltage value, effectively reducing the preparation cost of the power supply device. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a structural block diagram of an embodiment of the power supply device of the present application;

[0017] Figure 2 This is a structural block diagram of an embodiment of the connection between the power input circuit, the energy storage circuit, and the discharge circuit of the present application;

[0018] Figure 3 This is a structural block diagram of another embodiment of the power supply device of the present application. DETAILED DESCRIPTION

[0019] The following will be combined with the drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0020] It should be noted that if the embodiments of the present application involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative position relationship, movement status, etc. between the various components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indications will also change accordingly.

[0021] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present application, the descriptions of "first", "second", etc. are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of such features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the fact that they can be implemented by ordinary technicians in this field. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by this application.

[0022] See also Figure 1 , Figure 1 This is a structural block diagram of an embodiment of a power supply device provided in this application.

[0023] The present application provides a power supply device, such as Figure 1 As shown, a power supply device of this embodiment includes: a power input circuit 20, an energy storage circuit 40, and a discharge circuit 30. The power input circuit 20 is used to connect to an external power source 10. The two ends of the energy storage circuit 40 are respectively connected to the external power source 10. The energy storage circuit 40 is charged by the power input circuit 20 and is used to supply power to the load 50. The discharge circuit 30 is coupled to the power input circuit 20 and connected in parallel with the energy storage circuit 40. The discharge circuit 30 is configured to release the voltage stored in the power input circuit 20 before the energy storage circuit 40 supplies power to the load 50. The external power source 10 can be AC power, that is, the power input circuit 20 is directly connected to the AC power, thereby coupling the energy storage circuit 40. The energy storage circuit 40 can specifically be a capacitor. The power input circuit 20 can supply power to the energy storage circuit 40 through the AC power, so that the energy storage circuit 40 supplies power to the load 50.

[0024] In an optional embodiment, the power input circuit 20 is connected to the external power supply 10, and the external power supply 10 supplies power to the energy storage circuit 40 through the power input circuit 20, thereby charging the energy storage circuit 40. After the energy storage circuit 40 is charged, the energy storage circuit 40 can be used to supply power to the load 50. That is, after the energy storage circuit 40 supplies power to the load 50, the power of the energy storage circuit 40 is exhausted, and the external power supply 10 charges the energy storage circuit 40 again through the power input circuit 20. The load 50 can be set as a coil. When the energy storage circuit 40 supplies power to the coil, the voltage of the energy storage circuit 40 is input to the coil, so that the coil instantly generates current and thus generates an electromagnetic field.

[0025] In a specific application scenario, the power supply device is set in a magnetic therapy device, that is, the load 50 of the energy storage circuit 40 is set to an inductor, and the energy storage circuit 40 is set to an inductor. When the external power supply 10 charges and discharges the power supply device, the power supply device generates an electromagnetic field. Specifically, after the power input circuit 20 is connected to the external power supply 10, the external power supply 10 begins to power the energy storage circuit 40 through the power input circuit 20. After the energy storage circuit 40 is charged, it powers the load 50. The voltage of the energy storage circuit 40 is applied to the load 50, causing the load 50 to instantly generate current and thus generate an electromagnetic field. Since the energy storage circuit 40 is configured as a capacitor and the load 50 is configured as an inductor, that is, the load 50 is configured as inductive, an LC oscillating circuit is formed when the capacitor discharges the inductor. After the energy storage circuit 40 has completed discharging the load 50, the oscillating circuit generates an oscillating voltage U3. Furthermore, since the energy storage circuit 40 discharges the load 50, the discharge time is extremely short, and a negative voltage is also generated during the discharge. On this basis, when the external power supply 10 charges the energy storage circuit 40 through the power input circuit 20, the power input circuit 20 generates a charging voltage U1. That is, after the energy storage circuit 40 discharges the load 50, the power supply device generates a charging voltage U1, a discharge voltage U2 generated by the energy storage circuit 40, and an oscillating voltage U3 generated between the energy storage circuit 40 and the load 50. After discharge, the power supply device's withstand voltage is the sum of the charging voltage U1, the discharge voltage U2, and the oscillating voltage U3.

[0026] In this embodiment, in order to reduce the withstand voltage of the power supply device, a discharge circuit 30 is provided, which is coupled to the power input circuit 20 and connected in parallel with the energy storage circuit 40. After the external power supply 10 supplies power to the energy storage circuit 40 through the power input circuit 20 and reaches a preset voltage, the discharge circuit 30 is controlled to open, thereby discharging the charging voltage U1 generated by the external power supply 10. The charging voltage U1 of the power input circuit 20 will drop to close to 0V. At this time, the withstand voltage of the power supply device is the sum of the discharge voltage U2 and the oscillation voltage U3, thereby greatly reducing the withstand voltage of the power supply device, effectively improving the stability of the power supply device, and eliminating the need to prepare a power supply device with a high withstand voltage, effectively reducing the preparation cost of the power supply device. Specifically, the discharge circuit 30 is configured to wait for the stimulation command of the load 50 coil after the external power supply 10 supplies power to the energy storage circuit 40 through the power input circuit 20 and reaches a preset value before the energy storage circuit 40 supplies power to the load 50. That is, at this time, the discharge circuit 30 can be controlled to discharge the charging voltage U1 stored in the power input circuit 20, so that after the energy storage circuit 40 discharges the load 50, the withstand voltage value of the power supply device is the sum of the discharge voltage U2 and the oscillation voltage U3, thereby improving the stability of the power supply device and reducing the preparation cost of the power supply device.

[0027] In the above manner, by providing a discharge circuit 30 coupled to the power input circuit 20 and connected in parallel with the energy storage circuit 40 in the power supply device, and the discharge circuit 30 is configured to release the voltage stored in the power input circuit 20 after the external power supply 10 supplies power to the energy storage circuit 40 through the power input circuit 20 to reach a preset voltage before the energy storage circuit 40 supplies power to the load 50, the discharge circuit 30 can greatly reduce the withstand voltage of the power supply device, improve the stability and reliability of the power supply device, and do not need to prepare a power supply device with a high withstand voltage value, effectively reducing the preparation cost of the power supply device.

[0028] In an optional embodiment, the power input circuit 20 includes a PFC (Power Factor Correction) unit 201, a boost unit 202, and a pre-charge energy storage unit 203. The PFC unit 201 is configured to input a DC signal, the boost unit 202 is connected to the PFC unit 201, and the pre-charge energy storage unit 203 is connected to the boost unit 202. The boost unit 202 is configured to charge the pre-charge energy storage unit 203 and the energy storage circuit 40. The discharge circuit 30 is connected to both ends of the pre-charge energy storage unit 203 and is configured to release the voltage stored in the pre-charge energy storage unit 203 before the energy storage circuit 40 supplies power to the load 50. The pre-charge energy storage unit 203 can be configured as a capacitor, and the boost unit 202 can be configured as a DC-DC converter (DC-DC converter). Specifically, the PFC unit 201 can correct the power factor of the external power supply 10, thereby adjusting the phase difference between current and voltage, reducing idle power consumption, and further improving the stability and reliability of the power supply device. The boost unit 202 is connected to the PFC unit 201. The PFC unit 201 outputs a configured DC signal and corrects the power factor of the DC signal. The boost unit 202 can be specifically a DCDC converter. The DCDC converter receives the DC signal output by the PFC unit 201, thereby converting the voltage of the DC signal into a voltage accepted by the pre-charged energy storage unit 203. After the boost unit 202 converts the voltage of the DC signal, it outputs it to the pre-charged energy storage unit 203, thereby charging the pre-charged energy storage unit 203. After the pre-charged energy storage unit 203 is charged, the energy storage circuit 40 can be charged through the pre-charged energy storage unit 203.

[0029] In this embodiment, the discharge circuit 30 is connected to both ends of the pre-charged energy storage unit 203. That is, after the pre-charged energy storage unit 203 has completed charging the energy storage circuit 40, the pre-charged energy storage unit 203 can be discharged through the discharge circuit 30, thereby eliminating the charging voltage U1 of the external power supply 10 on the pre-charged energy storage unit 203, thereby improving the stability and reliability of the power supply device. Specifically, the discharge circuit 30 is configured to control the discharge circuit 30 to discharge the voltage stored in the pre-charged energy storage unit 203 after the energy storage circuit 40 has completed charging before the energy storage circuit 40 supplies power to the load 50, thereby eliminating the charging voltage U1 of the external power supply 10 on the pre-charged energy storage unit 203. This makes the withstand voltage value of the power supply device the sum of the discharge voltage U2 and the oscillation voltage U3, reducing the withstand voltage value required by the charging device, and improving the reliability and stability of the power supply device.

[0030] In an optional embodiment, the discharge circuit 30 includes: a first switch 301, a variable resistor 302, and a discharge unit 303 connected in series. The first switch 301 is further connected to one end of the pre-charged energy storage unit 203, and the discharge unit 303 is further connected to the other end of the pre-charged energy storage unit 203. Specifically, the first switch 301 is connected to one end of the pre-charged energy storage unit 203, and the other end is connected to the variable resistor 302. The discharge unit 303 is connected to the other end of the pre-charged energy storage unit 203, so that the discharge circuit 30 is connected to both ends of the pre-charged energy storage unit 203. After the external power supply 10 charges the pre-charged energy storage unit 203 through the power input circuit 20, the pre-charged energy storage unit 203 can charge the energy storage circuit 40. After the energy storage circuit 40 is fully charged and reaches a preset voltage, while waiting for a stimulation command from the load 50, the first switch 301 can be controlled to open, thereby discharging the voltage stored in the pre-charged energy storage unit 203 through the first switch 301, the variable resistor 302, and the discharge unit 303, thereby discharging the charging voltage U1 of the power supply device. When it is necessary to charge the pre-charged energy storage unit 203 again, the first switch 301 can be controlled to close, thereby closing the discharge circuit 30. Among them, the variable resistor 302 can control the discharge rate by changing the resistance, thereby protecting the discharge unit 303 and the power supply device.

[0031] In this embodiment, the discharge unit 303 is a transistor, including an input end, an output end, and a control end. The input end is connected to one end of the variable resistor 302, the output end is connected to the other end of the pre-charged energy storage unit 203, and the control end is used to connect to the control device 60 of the power supply device, and is configured to release the voltage stored in the pre-charged energy storage unit 203 before the energy storage circuit 40 supplies power to the load 50. That is, when the voltage stored in the pre-charged energy storage unit 203 is released, a signal is output by the control device 60, the control end of the discharge unit 303 receives the signal, and simultaneously controls the first switch 301 to open, and the voltage of the pre-charged energy storage unit 203 is released through the first switch 301, the variable resistor 302, and the discharge unit 303. After the voltage of the pre-charged energy storage unit 203 is released, the control device 60 controls the first switch 301 and the discharge unit 303 to close, so as to facilitate the subsequent charging of the pre-charged energy storage unit 203.

[0032] In an optional embodiment, the power supply device further includes a second switch 401, which is disposed between the discharge circuit 30 and the energy storage circuit 40. The second switch 401 is disposed between the discharge circuit 30 and the energy storage circuit 40. By controlling the on / off state of the second switch 401, the on / off state of the pre-charged energy storage unit 203 and the energy storage circuit 40 is controlled, thereby controlling the pre-charged energy storage unit 203 to charge the energy storage circuit 40. The second switch 401 can be configured as a high-voltage switching transistor.

[0033] In a specific application scenario, the external power supply 10 inputs the electrical signal into the PFC unit 201, configures the DC signal through the PFC unit 201, corrects the power factor of the DC signal, and outputs the configured DC signal to the boost unit 202. The boost unit 202 converts the voltage of the DC signal into the voltage required to charge the pre-charged energy storage unit 203, thereby charging the pre-charged energy storage unit 203. After the pre-charged energy storage unit 203 is charged, the second switch 401 is turned on, so that the pre-charged energy storage unit 203 is charged. The charging storage unit 203 charges the energy storage circuit 40. After the energy storage circuit 40 is charged and reaches the set value, it waits for the load 50 to receive a stimulation command. At this time, the first switch 301 is turned on, so that the discharge circuit 30 is turned on and the voltage stored in the pre-charged energy storage unit 203 is discharged, so that the charging voltage U1 of the power supply device drops rapidly to close to 0V. After the charging voltage U1 is discharged, the second switch 401 can be disconnected after a very short delay, specifically 1ms, to control the energy storage circuit 40 to discharge the load 50.

[0034] In this embodiment, since load 50 needs to generate an electromagnetic field, it is configured as an inductor. After the signal from external power supply 10 charges pre-charged energy storage unit 203 via PFC unit 201 and boost unit 202, second switch 401 is controlled to open, allowing the pre-charged energy storage unit to charge energy storage circuit 40. First switch 301 is controlled to open, allowing discharge circuit 30 to discharge the charged voltage U1 across pre-charged energy storage unit 203. After a very short delay, the energy storage circuit discharges load 50. Since load 50 is an inductor, an LC oscillating circuit is formed between load 50 and energy storage circuit 40, generating an oscillating voltage U3. Generally, oscillating voltage U3 is approximately 10 percent of charging voltage U1. When discharging load 50, energy storage circuit 40 generates a discharge voltage U2. Therefore, the voltage acting on the second switch 401 is the sum of the discharge voltage U2 and the oscillation voltage U3. Since the charge voltage U1 drops to near 0V, the single voltage applied to the second switch 401 is greatly reduced, thereby lowering the withstand voltage of the second switch 401. Since the second switch 401 is configured as a high-voltage switching transistor, the required withstand voltage of the second switch 401 is greatly reduced, thereby reducing the manufacturing cost of the second switch 401 and the manufacturing cost of the power supply device. Furthermore, the reduced voltage acting on the second switch 401 significantly reduces the probability of damage to the second switch 401, thereby improving the stability and reliability of the second switch 401 and the power supply device.

[0035] In this embodiment, a diode 402 is coupled across the second switch 401. The anode of the diode 402 is coupled to the output of the second switch 401, and the cathode of the diode 402 is coupled to the input of the second switch 401. The provision of the diode 402 across the second switch 401 allows the voltage carried by the second switch 401 to drop rapidly through the diode 402 after the second switch 401 is disconnected. This reduces the possibility of damage to the second switch 401 due to multiple on-off cycles, and protects the second switch 401 from damage during disconnection.

[0036] In an optional embodiment, the control device 60 is further communicatively connected to the boost unit 202, the discharge circuit 30, and the second switch 401, and the control device 60 is connected to an external device (not shown). The control device 60 is connected to the PFC unit 201 so that the PFC unit 201 supplies power to the control device 60. After the external power supply 10 charges the energy storage circuit 40 through the power input circuit 20, the control device 60 can control the first switch 301 to open, thereby causing the discharge circuit 30 to discharge the voltage stored in the pre-charged energy storage unit 203. After the pre-charged energy storage unit 203 is discharged, the control device 60 controls the second switch 401 to open, allowing the energy storage circuit 40 to discharge the load 50, thereby causing the load 50 to generate an electromagnetic field. While controlling the first switch 301 to open to discharge the discharge circuit 30, the control device 60 controls the boost unit 202 to perform wave blocking, thereby causing the charging voltage U1 to drop rapidly.

[0037] In this embodiment, the control device 60 is provided with an auxiliary power supply (not shown). The auxiliary power supply of the control device 60 can be connected to the PFC unit 201. After the external power supply 10 supplies power to the PFC unit 201, the PFC unit 201 configures the DC signal and the PFC unit 201 can start supplying power to the auxiliary power supply of the control device 60, thereby enabling the control device 60 to operate. The control device 60 is communicatively connected to an external component 601, which can be a computer. The control device 60 can be a digital signal processor. Communication with the control device 60 is achieved through the external component 601. The control device 60 can detect status data of the power supply device and control the frequency of charging and discharging the energy storage circuit 40 for the load 50. The control device 60 interacts with the external component 601, and the external component 601 can process and display the received status data. The control device 60 is provided with a communication circuit (not shown) for communication between the control device 60 and the external component 601.

[0038] In an optional embodiment, the power supply device further includes: a filter circuit 70 and a rectifier circuit 80, the filter circuit 70 and the rectifier circuit 80 being connected in sequence, the other end of the filter circuit 70 being connected to the external power supply 10, and the other end of the rectifier circuit 80 being coupled to the PFC unit 201. That is, the filter circuit 70 is connected to the external power supply 10, wherein the external power supply 10 may be a mains power supply. After being connected to the external power supply 10, the filter device may filter the AC signal of the mains power supply, and then input the filtered AC signal into the rectifier circuit 80. The rectifier circuit 80 converts the AC signal of the mains power supply into a DC signal, and then inputs the DC signal into the PFC unit 201 for power factor correction.

[0039] In an optional embodiment, the power supply device further includes a sampling circuit 602 and a protection circuit 603, and the sampling circuit 602 and the protection circuit 603 are coupled to the control device 60. The sampling circuit 602 may specifically include temperature sampling, voltage sampling, and current sampling, thereby sampling the temperature, voltage, and current of the power supply device. The control device 60 processes the sampled data to determine whether the temperature, voltage, and current of the power supply device meet the set values. The protection circuit 603 may specifically include temperature protection, current protection, and voltage protection. After the control device 60 processes the sampled temperature, voltage, and current data, if the temperature, voltage, and current of the power supply device do not meet the set values, the temperature protection, current protection, and voltage protection may be used to control the power supply device to stop operating. That is, when a fault occurs in the power supply device, the protection circuit 603 protects the power supply device to prevent safety accidents such as component damage in the power supply device.

[0040] In this embodiment, the control device 60 is configured to: obtain the charging current in the power supply device through the sampling circuit 602, determine whether the voltage of the charging current is lower than the preset reference voltage based on the charging current, and then, based on the difference between the sampled voltage and the preset reference voltage, if the difference is greater than the preset value, the power supply device can be shut down through the protection circuit 603 to prevent the power supply device from malfunctioning.

[0041] The release current and release voltage in the power supply device may also be directly sampled by the sampling circuit 602 , which is not specifically limited in this application.

[0042] In an optional embodiment, the power supply device further includes a third switch 501 disposed between the energy storage circuit 40 and the load 50. Specifically, after the energy storage circuit 40 reaches a set value, the control device 60 can transmit a command to stimulate the load 50, thereby causing the energy storage circuit 40 to discharge the load 50 and generate an electromagnetic field. Specifically, when the energy storage circuit 40 needs to discharge the inductor, the third switch 501 can be controlled to open, thereby causing the energy storage circuit 40 to discharge the inductor. The third switch 501 can be configured as a thyristor, which is not specifically limited in this application.

[0043] In an optional embodiment, a filter inductor 90 is provided between the pre-charge energy storage unit 203 and the discharge circuit 30. That is, when the pre-charge energy storage unit 203 releases an electrical signal to charge the energy storage circuit 40, the DC signal can be filtered by the filter inductor 90. The filter inductor 90 can also be set as other devices capable of filtering DC signals, such as a filter, which is not specifically limited in this application.

[0044] Through the above-described approach, the present application provides a discharge circuit 30 within the power supply device, coupled to the power input circuit 20 and connected in parallel with the energy storage circuit 40. The discharge circuit 30 is configured to release the stored voltage in the circuit input circuit before the energy storage circuit 40 supplies power to the load 50. This significantly reduces the withstand voltage of the power supply device, improves the stability and reliability of the power supply device, and eliminates the need to manufacture a power supply device with a high withstand voltage, effectively reducing the manufacturing cost of the power supply device. By providing a PFC unit 201, a boost unit 202, and a pre-charge energy storage unit 203, the PFC unit 201 can configure a DC signal, and the boost unit 202 can convert the voltage of the DC signal, thereby pre-charging the energy storage unit 203 with the input signal. By configuring the discharge circuit 30 before the energy storage circuit 40 supplies power to the load 50, the discharge circuit 30 can discharge the voltage stored in the pre-charge energy storage unit 203, reducing the withstand voltage of the power supply device. By setting up a method of connecting the first switch 301, the variable resistor 302, and the discharge unit 303 in this way, the first switch 301 can be controlled to open during discharge so that the discharge unit 303 discharges, and the discharge rate can be controlled by the variable circuit to protect the discharge unit 303. By setting up a second switch 401 between the discharge circuit 30 and the energy storage circuit 40, the on and off of the second switch 401 can be controlled to charge the energy storage circuit 40. By setting up a control device 60 with an auxiliary power supply, the on and off of the second switch 401 can be controlled by the control device 60, the discharge circuit 30 discharges, and the boost unit 202 performs wave blocking, so that the voltage stored in the pre-charged energy storage unit 203 drops rapidly. By setting up a filter circuit 70 and a rectifier circuit 80 at the output end of the external power supply 10, the AC signal of the mains can be filtered, and the AC signal can be converted into a DC signal by the rectifier circuit 80. By providing a sampling circuit 602 and a protection circuit 603 in the control device 60, data of the power supply device can be sampled and the power supply device can be protected to prevent safety accidents such as component damage in the power supply device.

[0045] The present application also provides a magnetic therapy device, which includes: a power supply device, which is arranged in the magnetic therapy device, and the power supply device is the power supply device of any of the above-mentioned embodiments.

[0046] The above description is only an implementation method of the present application and does not limit the patent scope of the present application. Any equivalent structure or equivalent process transformation made using the contents of the description and drawings of this application, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present application.

Claims

1. A power supply device, characterized in that: The power supply device comprises: Power input circuit, used to connect to an external power supply; an energy storage circuit, wherein both ends of the energy storage circuit are respectively connected to the external power supply, the energy storage circuit is charged through the power input circuit, and is used to power a load; A discharge circuit is coupled to the power input circuit and connected in parallel with the energy storage circuit; the discharge circuit is configured to release the voltage stored in the power input circuit before the energy storage circuit supplies power to the load.

2. The power supply device according to claim 1, wherein: The power input circuit includes: The PFC unit is configured to input a DC signal; A boost unit connected to the PFC unit; A pre-charged energy storage unit connected to the boost unit; The boost unit is configured to charge the pre-charged energy storage unit and the energy storage circuit; The discharge circuit is connected to both ends of the pre-charged energy storage unit and is configured to release the voltage stored in the pre-charged energy storage unit before the energy storage circuit supplies power to the load.

3. The power supply device according to claim 2, wherein: The discharge circuit comprises: A first switch, a variable resistor and a discharge unit are connected in series, the first switch is also connected to one end of the pre-charge energy storage unit, and the discharge unit is also connected to the other end of the pre-charge energy storage unit.

4. The power supply device according to claim 3, wherein: The discharge unit is a transistor, comprising an input terminal, an output terminal and a control terminal; The input end is connected to one end of the variable resistor, the output end is connected to the other end of the pre-charged energy storage unit, and the control end is used to be connected to the control device of the power supply device, and is configured to release the voltage stored in the pre-charged energy storage unit before the energy storage circuit supplies power to the load.

5. The power supply device according to claim 1, wherein: The power supply device further includes a second switch, which is arranged between the discharge circuit and the energy storage circuit; A diode is coupled to both ends of the second switch, an anode of the diode is coupled to the output end of the second switch, and a cathode of the diode is coupled to the input end of the second switch.

6. The power supply device according to claim 2, wherein: The power supply device further includes: A filter circuit and a rectifier circuit are connected in sequence, the other end of the filter circuit is connected to the external power supply, and the other end of the rectifier circuit is coupled to the PFC unit.

7. The power supply device according to claim 4, characterized in that: The power supply device further includes a sampling circuit and a protection circuit, and the sampling circuit and the protection circuit are coupled to the control device.

8. The power supply device according to claim 1, wherein: The power supply device further includes: The third switch is arranged between the energy storage circuit and the load, wherein the third switch is a thyristor.

9. The power supply device according to claim 2, wherein: A filter inductor is provided between the pre-charge energy storage unit and the discharge circuit.

10. A magnetic therapy device, characterized in that: The magnetic therapy device includes: a power supply device, which is arranged in the magnetic therapy device, and the power supply device is the power supply device according to any one of claims 1-9.

Images