High voltage output circuits and power supply equipment

Abstract

The present application discloses a high-voltage output circuit and a power supply device, including: a first feedback regulation unit, a plurality of transformer units, a plurality of BUCK units, a plurality of second feedback regulation units and a plurality of control units. Each transformer unit is used to perform voltage conversion on a first voltage signal and output a second voltage signal. Each BUCK unit is used to output a third voltage signal according to the second voltage signal, and a plurality of BUCK units have a positive output terminal and a negative output terminal. A plurality of BUCK units are connected in series through the positive output terminal and the negative output terminal to output a fourth voltage signal to the outside. The first feedback regulation unit is used to obtain a first feedback control amount according to a preset target voltage and a fourth voltage signal. Each second feedback regulation unit is used to obtain a second feedback control amount according to the third voltage signal of the corresponding BUCK unit and the first feedback control amount. Each control unit is used to control the corresponding BUCK unit according to the second feedback control amount.

Description

Technical Field

[0001] The present application relates to the technical field of power supply equipment, and in particular to a high voltage output circuit and a power supply equipment. Background Art

[0002] In the existing isolated high-voltage DC power supply technology, multiple BUCK modules are connected in series to boost the voltage and achieve high-voltage output. However, there is an uneven voltage problem between multiple BUCK modules, which may cause the total output voltage to be too high, or cause the voltage of a certain BUCK module to be too high, which is prone to switch tube breakdown or capacitor breakdown, resulting in failure of the isolated high-voltage DC power supply. Summary of the invention

[0003] The present application aims to provide a high-voltage output circuit and a power supply device, which can solve the problem of uneven voltage when BUCK modules are connected in series.

[0004] In a first aspect, an embodiment of the present application provides a high-voltage output circuit, comprising:

[0005] A plurality of transformer units, wherein input ends of the plurality of transformer units are used to input a first voltage signal, and each transformer unit is used to perform voltage conversion on the first voltage signal and output a second voltage signal;

[0006] A plurality of BUCK units, wherein the plurality of BUCK units correspond to the plurality of transformer units, the input ends of the plurality of BUCK units are correspondingly connected to the first secondary windings of the plurality of transformer units, each of the BUCK units is used to output a third voltage signal according to the second voltage signal, the plurality of BUCK units all have a positive output end and a negative output end, and the plurality of BUCK units are connected in series through the positive output end and the negative output end, wherein the positive output end of the first BUCK unit is used as a first main output end, and the negative output end of the last BUCK unit is used as a second main output end, and the first main output end and the second main output end are used to output a fourth voltage signal to the outside, and the fourth voltage signal is the sum of the plurality of third voltage signals;

[0007] a first feedback regulation unit, the first feedback regulation unit being connected to the first main output terminal and the second main output terminal, and the first feedback regulation unit being used to obtain a first feedback control amount according to a preset target voltage and the fourth voltage signal;

[0008] a plurality of second feedback regulating units, the plurality of second feedback regulating units corresponding to the plurality of BUCK units, the plurality of second feedback regulating units correspondingly connected to the positive output ends of the plurality of BUCK units, the plurality of second feedback regulating units correspondingly connected to the negative output ends of the plurality of BUCK units, the plurality of second feedback regulating units all connected to the first feedback regulating unit, each of the second feedback regulating units being used to obtain a second feedback control amount according to a third voltage signal of the corresponding BUCK unit and the first feedback control amount;

[0009] A plurality of control units, the plurality of control units correspond to the plurality of BUCK units, the plurality of control units are correspondingly connected to the plurality of BUCK units, a plurality of second feedback adjustment units are correspondingly connected to the plurality of control units, and each of the control units is used to control the corresponding BUCK unit according to the second feedback control amount so that the fourth voltage signal reaches the target voltage.

[0010] According to some embodiments of the present application, the first feedback adjustment unit includes:

[0011] a first voltage sampling subunit, the first voltage sampling subunit being connected to the first main output terminal and the second main output terminal, and the first voltage sampling subunit being used to collect the fourth voltage signal to obtain a first sampled voltage;

[0012] A first operational amplifier subunit, wherein the first input terminal of the first operational amplifier subunit is used to input the target voltage, the second input terminal of the first operational amplifier subunit is connected to the first voltage sampling subunit, the first operational amplifier subunit is connected to a plurality of the second feedback adjustment units, and the first operational amplifier subunit is used to obtain the first feedback control quantity according to the target voltage and the first sampling voltage, and output it to the plurality of the second feedback adjustment units.

[0013] According to some embodiments of the present application, the first voltage sampling subunit includes:

[0014] A first operational amplifier, wherein the non-inverting input terminal of the first operational amplifier is connected to the first main output terminal, the inverting input terminal of the first operational amplifier is connected to the second main output terminal, and the output terminal of the first operational amplifier is connected to the second input terminal of the first operational amplifier subunit.

[0015] According to some embodiments of the present application, the first operational amplifier subunit includes:

[0016] A second operational amplifier, wherein the non-inverting input terminal of the second operational amplifier is used to input the target voltage, the inverting input terminal of the second operational amplifier is connected to the first voltage sampling subunit, and the output terminal of the second operational amplifier is connected to a plurality of the second feedback adjustment units.

[0017] According to some embodiments of the present application, each of the second feedback adjustment units includes:

[0018] a second voltage sampling subunit, the second voltage sampling subunit being correspondingly connected to the positive output terminal and the negative output terminal of the BUCK unit, and the second voltage sampling subunit being used to collect the third voltage signal of the BUCK unit to obtain a second sampled voltage;

[0019] A second operational amplifier subunit, wherein the first input end of the second operational amplifier subunit is connected to the first feedback adjustment unit, the second input end of the second operational amplifier subunit is connected to the second voltage sampling subunit, the second operational amplifier subunit is correspondingly connected to the control unit, and the second operational amplifier subunit is used to obtain the second feedback control amount according to the first feedback control amount and the second sampling voltage, and output it to the corresponding control unit.

[0020] According to some embodiments of the present application, the second voltage sampling subunit includes:

[0021] A third operational amplifier, wherein the non-inverting input terminal of the third operational amplifier is correspondingly connected to the positive output terminal of the BUCK unit, the inverting input terminal of the third operational amplifier is correspondingly connected to the negative output terminal of the BUCK unit, and the output terminal of the third operational amplifier is connected to the second input terminal of the second operational amplifier subunit.

[0022] According to some embodiments of the present application, the second operational amplifier subunit includes:

[0023] A fourth operational amplifier, wherein the non-inverting input terminal of the fourth operational amplifier is connected to the first feedback adjustment unit, the second input terminal of the fourth operational amplifier is connected to the second voltage sampling subunit, and the output terminal of the fourth operational amplifier is correspondingly connected to the control unit.

[0024] According to some embodiments of the present application, each of the second feedback adjustment units further includes:

[0025] The isolation operational amplifier subunit, the first feedback adjustment unit is connected to the input end of the isolation operational amplifier subunit, and the output end of the isolation operational amplifier subunit is connected to the first input end of the second operational amplifier subunit.

[0026] According to some embodiments of the present application, it further includes:

[0027] Multiple first rectifier units, the multiple first rectifier units correspond to the multiple transformer units, the input ends of the multiple first rectifier units are correspondingly connected to the first secondary windings of the multiple transformer units, and the output ends of the multiple first rectifier units are correspondingly connected to the input ends of the multiple BUCK units.

[0028] In a second aspect, an embodiment of the present application provides a power supply device, including a high-voltage output circuit as described above.

[0029] In the embodiment of the present application, multiple BUCK units are connected in series to achieve high-voltage output, and the outer-loop feedback regulation of the total output voltage is achieved through the first feedback regulation unit, that is, the fourth voltage signal is feedback regulated, and the first feedback control amount is output to multiple second feedback regulation units, and then the inner-loop feedback regulation of multiple BUCK units is achieved through multiple second feedback regulation units, that is, the multiple third voltage signals are feedback regulated, and multiple second feedback control amounts are obtained by using the first feedback control amount, and the multiple second feedback control amounts are output to multiple control units, and the multiple control units control the corresponding third voltage signals output by the BUCK units according to the second feedback control amount. In other words, the total output voltage reaches the target voltage through the outer-loop feedback regulation, and the total output voltage is evenly divided by multiple BUCK units through each inner-loop feedback regulation, thereby achieving voltage-balanced control of multiple BUCK units.

[0030] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become apparent from the description below, or will be learned through the practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] The present application is further described below with reference to the accompanying drawings and embodiments, wherein:

[0032] Figure 1 A schematic diagram of a plurality of BUCK units connected in series in an embodiment of a high-voltage output circuit provided by the present application;

[0033] Figure 2 A schematic diagram of a BUCK unit, a first feedback regulation unit, and a second feedback regulation unit in an embodiment of a high-voltage output circuit provided in the present application;

[0034] Figure 3 A schematic diagram of a second feedback control amount, a triangular carrier signal and a driving duty cycle of a MOS tube in an embodiment of a high-voltage output circuit provided by the present application;

[0035] Figure 4 This is a schematic diagram of a plurality of high-voltage output circuits connected in series for output in an embodiment of a high-voltage output circuit provided in the present application.

[0036] Reference numerals:

[0037] High voltage output circuit 100, transformer unit 110, BUCK unit 120, control unit 130, first voltage sampling subunit 140, second voltage sampling subunit 150, first operational amplifier subunit 160, second operational amplifier subunit 170, isolation operational amplifier subunit 180, first rectifier unit 190, second rectifier unit 200, MCU300. DETAILED DESCRIPTION

[0038] The embodiments of the present application are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present application, and cannot be understood as limiting the present application.

[0039] In the description of the present application, it should be understood that the descriptions involving orientation, such as the orientation or positional relationship indicated as up, down, etc., are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0040] In the description of this application, "a plurality" means more than two. If there is a description of "first" or "second", it is only for the purpose of distinguishing technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0041] In the description of this application, 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 this application based on the specific content of the technical solution.

[0042] In order to achieve high-voltage output, the existing isolated high-voltage DC power supply needs to use a large magnetic component to wind the isolation transformer, which is not only large in size and high in cost, but also not conducive to the expansion of current and power. In addition, it is necessary to use high-voltage semiconductor switching devices, such as MOS tubes and diodes. Compared with conventional semiconductor switching devices, such high-voltage semiconductor switching devices are not only expensive, but also due to the improvement of voltage resistance, the performance such as switching frequency, on-resistance or on-voltage drop will be greatly reduced. In addition, when the isolated high-voltage DC power supply is started, if the high-voltage output is required to be established quickly, it means that the voltage climbing slope is very large. The excessive voltage rising slope makes it difficult for the power supply to stabilize quickly, and even causes a large voltage overshoot. For high-voltage power supplies with a wide range of output, it is often necessary to start from 0V. The large voltage range makes it difficult for the high-voltage power supply to guarantee the performance indicators of the low-voltage section.

[0043] Refer to the following Figures 1 to 4 A high voltage output circuit 100 and a power supply device according to an embodiment of the present application are described.

[0044] In a first aspect, an embodiment of the present application provides a high-voltage output circuit 100, comprising:

[0045] A plurality of transformer units 110, wherein the input ends of the plurality of transformer units 110 are used to input a first voltage signal, and each transformer unit 110 is used to perform voltage conversion on the first voltage signal and output a second voltage signal;

[0046] A plurality of BUCK units 120, the plurality of BUCK units 120 correspond to the plurality of transformer units 110, the input ends of the plurality of BUCK units 120 are correspondingly connected to the first secondary windings of the plurality of transformer units 110, each BUCK unit 120 is used to output a third voltage signal according to the second voltage signal, and the plurality of BUCK units 120 have a positive output end and a negative output end, such as Figure 1 As shown, a plurality of BUCK units 120 are connected in series via a positive output terminal and a negative output terminal, wherein the positive output terminal of the first BUCK unit 120 is used as a first main output terminal, and the negative output terminal of the last BUCK unit 120 is used as a second main output terminal, and the first main output terminal and the second main output terminal are used to output a fourth voltage signal to the outside, and the fourth voltage signal is the sum of the plurality of third voltage signals;

[0047] The first feedback regulation unit, such as Figure 2 As shown, the first feedback adjustment unit is connected to the first main output terminal and the second main output terminal, and the first feedback adjustment unit is used to obtain a first feedback control amount according to a preset target voltage and a fourth voltage signal;

[0048] A plurality of second feedback adjustment units, such as Figure 2 As shown, the plurality of second feedback adjustment units correspond to the plurality of BUCK units 120, the plurality of second feedback adjustment units are connected to the positive output ends of the plurality of BUCK units 120, the plurality of second feedback adjustment units are connected to the negative output ends of the plurality of BUCK units 120, and the plurality of second feedback adjustment units are all connected to the first feedback adjustment unit, and each second feedback adjustment unit is used to obtain the second feedback control amount according to the third voltage signal of the corresponding BUCK unit 120 and the first feedback control amount;

[0049] A plurality of control units 130, such as Figure 2 As shown, multiple control units 130 correspond to multiple BUCK units 120, multiple control units 130 are correspondingly connected to multiple BUCK units 120, multiple second feedback adjustment units are correspondingly connected to multiple control units 130, and each control unit 130 is used to control the corresponding BUCK unit 120 according to the second feedback control amount so that the fourth voltage signal reaches the target voltage.

[0050] In the embodiment of the present application, multiple BUCK units 120 are connected in series to achieve high-voltage output, and the outer-loop feedback regulation of the total output voltage is achieved through the first feedback regulation unit, that is, the fourth voltage signal is feedback regulated, and the first feedback control amount is output to multiple second feedback regulation units, and then the inner-loop feedback regulation of multiple BUCK units 120 is achieved through multiple second feedback regulation units, that is, the multiple third voltage signals are feedback regulated, and multiple second feedback control amounts are obtained by using the first feedback control amount, and the multiple second feedback control amounts are output to multiple control units 130, and the multiple control units 130 control the corresponding third voltage signals output by the BUCK units 120 according to the second feedback control amount. In other words, the total output voltage reaches the target voltage through the outer-loop feedback regulation, and the total output voltage is evenly divided by multiple BUCK units 120 through each inner-loop feedback regulation, thereby realizing voltage-balanced control of multiple BUCK units 120.

[0051] In this embodiment, compared with the traditional method of using a large magnetic component to wind an isolation transformer, since multiple BUCK units 120 share the total output voltage, there is no need to use a high-voltage semiconductor switch device, and the switching frequency, on-resistance or on-voltage drop performance will not be reduced for the sake of voltage resistance, and the volume and cost can be reduced. In addition, when high-voltage output is required to be established quickly, since each BUCK unit 120 shares the total output voltage, the voltage climbing slope of each BUCK unit 120 at the time of output is also relatively small, and a stable high-voltage output can be performed. And since the output voltage range span of each BUCK unit 120 is reduced, the performance indicators of the low-voltage section can be guaranteed.

[0052] In some embodiments of the present application, each control unit 130 performs drive control of the switch tube of each BUCK unit 120 according to the size of the obtained second feedback control amount, that is, the second feedback control amount directly determines the drive duty cycle of the MOS tube in the BUCK unit 120. Figure 3 As shown, Figure 3In the figure, Vcomp is the second feedback control amount, and Vramp is the triangular carrier signal. The second feedback control amount is compared with the triangular carrier signal inside the control unit 130. The triangular carrier signal is a signal wave with a period of T and an amplitude that varies within a certain range (such as 5Vp-p). In a period T, when the second feedback control amount is greater than the amplitude of the triangular carrier signal, the drive of the MOS tube is turned on, and when the second feedback control amount is less than the carrier amplitude, the drive of the MOS tube is turned off. In a switching cycle, the ratio of the MOS drive on time Ton to the period T is the drive duty cycle of the MOS tube. The output voltage of the BUCK unit 120 is directly determined by the drive duty cycle of the MOS tube, that is, by the second feedback control amount. Therefore, the output voltage of the BUCK unit 120 can be controlled by the second feedback control amount.

[0053] In some embodiments of the present application, the first main output terminal is the positive output terminal of the fourth voltage signal, the second main output terminal is the negative output terminal of the fourth voltage signal, and the fourth voltage signal is output through the first main output terminal and the second main output terminal.

[0054] In some embodiments of the present application, the transformer unit 110 uses an isolation transformer, and the first secondary winding of the transformer unit 110 is a secondary power winding of the isolation transformer. The BUCK unit 120 uses a BUCK circuit module. The control unit 130 uses a BUCK control chip. The preset target voltage can be output by the MCU 300.

[0055] In some embodiments of the present application, Figure 2 As shown, the first feedback adjustment unit includes:

[0056] A first voltage sampling subunit 140, the first voltage sampling subunit 140 is connected to the first main output terminal and the second main output terminal, and the first voltage sampling subunit 140 is used to collect the fourth voltage signal to obtain a first sampling voltage;

[0057] The first operational amplifier subunit 160, the first input terminal of the first operational amplifier subunit 160 is used to input the target voltage, the second input terminal of the first operational amplifier subunit 160 is connected to the first voltage sampling subunit 140, the first operational amplifier subunit 160 is connected to multiple second feedback adjustment units, the first operational amplifier subunit 160 is used to obtain a first feedback control amount according to the target voltage and the first sampling voltage, and output it to the multiple second feedback adjustment units.

[0058] In this embodiment, the first voltage sampling subunit 140 samples the total output voltage, that is, samples the fourth voltage signal to obtain a first sampling voltage, and then outputs the first sampling voltage to the second input terminal of the first operational amplifier subunit 160. The target voltage is input to the first input terminal of the first operational amplifier subunit 160. The first operational amplifier subunit 160 obtains a first feedback control quantity based on the target voltage and the first sampling voltage, and outputs it to multiple second feedback adjustment units.

[0059] In some embodiments of the present application, the first voltage sampling subunit 140 may collect the fourth voltage signal using a voltage sensor, a voltage sampling resistor, etc. The collected fourth voltage signal may be scaled down according to a specific application scenario to obtain the first sampled voltage.

[0060] In some embodiments of the present application, Figure 2 As shown, the first voltage sampling subunit 140 includes:

[0061] The first operational amplifier has a non-inverting input terminal connected to the first main output terminal, an inverting input terminal connected to the second main output terminal, and an output terminal of the first operational amplifier connected to the second input terminal of the first operational amplifier subunit 160 .

[0062] In this embodiment, the fourth voltage signal is collected by the first operational amplifier, that is, the non-inverting input terminal and the inverting input terminal of the first operational amplifier are respectively connected to the first main output terminal and the second main output terminal, and the output terminal of the first operational amplifier outputs the first sampling voltage.

[0063] In some embodiments of the present application, Figure 2 As shown, the first operational amplifier subunit 160 includes:

[0064] The second operational amplifier, the non-inverting input terminal of the second operational amplifier is used to input the target voltage, the inverting input terminal of the second operational amplifier is connected to the first voltage sampling sub-unit 140, and the output terminal of the second operational amplifier is connected to multiple second feedback adjustment units.

[0065] In this embodiment, the target voltage is input to the non-inverting input terminal of the second operational amplifier, the first sampling voltage is input to the inverting input terminal of the second operational amplifier, and the first feedback control amount is output to multiple second feedback adjustment units through the output terminal of the second operational amplifier.

[0066] In some embodiments of the present application, Figure 2 As shown, each second feedback adjustment unit includes:

[0067] A second voltage sampling subunit 150, the second voltage sampling subunit 150 is correspondingly connected to the positive output terminal and the negative output terminal of the BUCK unit 120, and the second voltage sampling subunit 150 is used to collect the third voltage signal of the BUCK unit 120 to obtain a second sampling voltage;

[0068] The second operational amplifier subunit 170, the first input end of the second operational amplifier subunit 170 is connected to the first feedback adjustment unit, the second input end of the second operational amplifier subunit 170 is connected to the second voltage sampling subunit 150, the second operational amplifier subunit 170 is correspondingly connected to the control unit 130, the second operational amplifier subunit 170 is used to obtain the second feedback control amount according to the first feedback control amount and the second sampling voltage, and output it to the corresponding control unit 130.

[0069] In this embodiment, the output voltage of the corresponding BUCK unit 120 is collected by the second voltage sampling subunit 150, that is, the third voltage signal of the BUCK unit 120 is collected to obtain a second sampling voltage, and the second sampling voltage is output to the second input terminal of the second operational amplifier subunit 170. The first input terminal of the second operational amplifier subunit 170 inputs the first feedback control amount, and the second operational amplifier subunit 170 obtains the second feedback control amount according to the first feedback control amount and the second sampling voltage. The output terminal of the second operational amplifier subunit 170 outputs the second feedback control amount to the corresponding control unit 130.

[0070] In some embodiments of the present application, the second voltage sampling subunit 150 may collect the third voltage signal using a voltage sensor, a voltage sampling resistor, etc. The collected third voltage signal may be scaled down according to a specific application scenario to obtain a second sampled voltage.

[0071] In some embodiments of the present application, Figure 2 As shown, the second voltage sampling subunit 150 includes:

[0072] The third operational amplifier, the non-inverting input terminal of the third operational amplifier is correspondingly connected to the positive output terminal of the BUCK unit 120, the inverting input terminal of the third operational amplifier is correspondingly connected to the negative output terminal of the BUCK unit 120, and the output terminal of the third operational amplifier is connected to the second input terminal of the second operational amplifier sub-unit 170.

[0073] In this embodiment, the non-inverting input terminal and the inverting input terminal of the third operational amplifier are respectively connected to the positive output terminal and the negative output terminal of the BUCK unit 120, and the output voltage of the BUCK unit 120 is collected to obtain a second sampling voltage, and the output terminal of the third operational amplifier outputs the second sampling voltage to the second operational amplifier sub-unit 170.

[0074] In some embodiments of the present application, Figure 2 As shown, the second operational amplifier subunit 170 includes:

[0075] A fourth operational amplifier, wherein the non-inverting input terminal of the fourth operational amplifier is connected to the first feedback regulation unit, the second input terminal of the fourth operational amplifier is connected to the second voltage sampling subunit 150 , and the output terminal of the fourth operational amplifier is correspondingly connected to the control unit 130 .

[0076] In this embodiment, the first feedback control quantity is input to the non-inverting input terminal of the fourth operational amplifier, the second sampling voltage is input to the inverting input terminal of the fourth operational amplifier, the fourth operational amplifier obtains the second feedback control quantity based on the first feedback control quantity and the second sampling voltage, and the output terminal of the fourth operational amplifier outputs the second feedback control quantity to the corresponding control unit 130.

[0077] In some embodiments of the present application, Figure 2 As shown, each second feedback adjustment unit also includes:

[0078] The isolation operational amplifier sub-unit 180 , the first feedback adjustment unit is connected to the input end of the isolation operational amplifier sub-unit 180 , and the output end of the isolation operational amplifier sub-unit 180 is connected to the first input end of the second operational amplifier sub-unit 170 .

[0079] In this embodiment, the first feedback control amount output by the first feedback adjustment unit is input to the first input terminal of the second operational amplifier subunit 170 through the isolation operational amplifier subunit 180. The isolation operational amplifier subunit 180 plays a role in signal isolation, solving the problem that different BUCK units 120 do not share a common ground. The isolation operational amplifier subunit 180 can use an isolation signal amplifier, and the amplification ratio of the isolation operational amplifier subunit 180 is 1:1.

[0080] In some embodiments of the present application, Figure 2 As shown, it also includes:

[0081] There are multiple first rectifier units 190, and the multiple first rectifier units 190 correspond to the multiple transformer units 110. The input ends of the multiple first rectifier units 190 are correspondingly connected to the first secondary windings of the multiple transformer units 110, and the output ends of the multiple first rectifier units 190 are correspondingly connected to the input ends of the multiple BUCK units 120.

[0082] In this embodiment, the second voltage signal output by the first secondary winding of the transformer unit 110 is rectified by the first rectifier unit 190 to obtain a DC signal, and then the DC signal is input to the corresponding BUCK unit 120 .

[0083] In some embodiments of the present application, the first rectifying unit 190 may adopt a half-wave rectifying circuit, a full-wave rectifying circuit, or the like.

[0084] In some embodiments of the present application, Figure 2As shown, it also includes:

[0085] Multiple second rectifier units 200, the multiple second rectifier units 200 correspond to the multiple transformer units 110, the input ends of the multiple second rectifier units 200 are correspondingly connected to the second secondary windings of the multiple transformer units 110, and the output ends of the multiple second rectifier units 200 are used for low-voltage power supply.

[0086] In this embodiment, the second secondary winding of the transformer unit 110 outputs a fifth voltage signal. The transformer unit 110 adopts an isolation transformer. The second secondary winding of the transformer unit 110 is the secondary auxiliary winding of the isolation transformer. The fifth voltage signal is rectified into a low voltage signal through the second rectifier unit 200 for low voltage power supply.

[0087] In some embodiments of the present application, Figure 2 As shown, multiple second rectifier units 200 are connected to multiple control units 130, multiple second rectifier units 200 are connected to multiple isolation op amp sub-units 180, and multiple second rectifier units 200 are connected to multiple second op amp sub-units 170, thereby providing low-voltage power supply to multiple control units 130, multiple isolation op amp sub-units 180, and multiple second op amp sub-units 170.

[0088] In some embodiments of the present application, Figure 4 As shown, according to the application scenario, multiple high-voltage output circuits 100 can be connected in series through the first main output terminal and the second main output terminal to further output a higher voltage.

[0089] In addition, an embodiment of the present application provides a power supply device, including the high-voltage output circuit 100 as described above.

[0090] The power supply device provided in the embodiment of the present application can implement each process implemented in the above-mentioned circuit embodiment and achieve the same beneficial effects. To avoid repetition, it will not be described here.

[0091] The embodiments of the present application are described in detail above in conjunction with the accompanying drawings, but the present application is not limited to the above embodiments, and various changes can be made within the knowledge scope of ordinary technicians in the relevant technical field without departing from the purpose of the present application.

Claims

1. A high voltage output circuit, characterized in that: include: A plurality of transformer units, wherein the input ends of the plurality of transformer units are used to input a first voltage signal, and the first secondary winding of each transformer unit is used to perform voltage conversion on the first voltage signal and output a second voltage signal; A plurality of BUCK units, wherein the plurality of BUCK units correspond to the plurality of transformer units, the input ends of the plurality of BUCK units are correspondingly connected to the first secondary windings of the plurality of transformer units, each of the BUCK units is used to output a third voltage signal according to the second voltage signal, the plurality of BUCK units all have a positive output end and a negative output end, and the plurality of BUCK units are connected in series through the positive output end and the negative output end, wherein the positive output end of the first BUCK unit is used as a first main output end, and the negative output end of the last BUCK unit is used as a second main output end, and the first main output end and the second main output end are used to output a fourth voltage signal to the outside, and the fourth voltage signal is the sum of the plurality of third voltage signals; a first feedback regulation unit, the first feedback regulation unit being connected to the first main output terminal and the second main output terminal, and the first feedback regulation unit being used to obtain a first feedback control amount according to a preset target voltage and the fourth voltage signal; a plurality of second feedback regulating units, the plurality of second feedback regulating units corresponding to the plurality of BUCK units, the plurality of second feedback regulating units correspondingly connected to the positive output ends of the plurality of BUCK units, the plurality of second feedback regulating units correspondingly connected to the negative output ends of the plurality of BUCK units, the plurality of second feedback regulating units all connected to the first feedback regulating unit, each of the second feedback regulating units being used to obtain a second feedback control amount according to a third voltage signal of the corresponding BUCK unit and the first feedback control amount; A plurality of control units, the plurality of control units correspond to the plurality of BUCK units, the plurality of control units are correspondingly connected to the plurality of BUCK units, a plurality of second feedback adjustment units are correspondingly connected to the plurality of control units, and each of the control units is used to control the corresponding BUCK unit according to the second feedback control amount so that the fourth voltage signal reaches the target voltage.

2. The high voltage output circuit according to claim 1, characterized in that: The first feedback adjustment unit comprises: a first voltage sampling subunit, the first voltage sampling subunit being connected to the first main output terminal and the second main output terminal, and the first voltage sampling subunit being used to collect the fourth voltage signal to obtain a first sampled voltage; A first operational amplifier subunit, wherein the first input terminal of the first operational amplifier subunit is used to input the target voltage, the second input terminal of the first operational amplifier subunit is connected to the first voltage sampling subunit, the first operational amplifier subunit is connected to a plurality of the second feedback adjustment units, and the first operational amplifier subunit is used to obtain the first feedback control quantity according to the target voltage and the first sampling voltage, and output it to the plurality of the second feedback adjustment units.

3. The high voltage output circuit according to claim 2, characterized in that: The first voltage sampling subunit comprises: A first operational amplifier, wherein the non-inverting input terminal of the first operational amplifier is connected to the first main output terminal, the inverting input terminal of the first operational amplifier is connected to the second main output terminal, and the output terminal of the first operational amplifier is connected to the second input terminal of the first operational amplifier subunit.

4. The high voltage output circuit according to claim 2, characterized in that: The first operational amplifier subunit comprises: A second operational amplifier, wherein the non-inverting input terminal of the second operational amplifier is used to input the target voltage, the inverting input terminal of the second operational amplifier is connected to the first voltage sampling subunit, and the output terminal of the second operational amplifier is connected to a plurality of the second feedback adjustment units.

5. The high voltage output circuit according to claim 1, characterized in that: Each of the second feedback adjustment units comprises: a second voltage sampling subunit, the second voltage sampling subunit being connected to the positive output terminal and the negative output terminal of the BUCK unit, and being used for collecting the third voltage signal of the BUCK unit to obtain a second sampling voltage; A second operational amplifier subunit, wherein the first input end of the second operational amplifier subunit is connected to the first feedback adjustment unit, the second input end of the second operational amplifier subunit is connected to the second voltage sampling subunit, the second operational amplifier subunit is correspondingly connected to the control unit, and the second operational amplifier subunit is used to obtain the second feedback control amount according to the first feedback control amount and the second sampling voltage, and output it to the corresponding control unit.

6. The high voltage output circuit according to claim 5, characterized in that: The second voltage sampling subunit comprises: A third operational amplifier, wherein the non-inverting input terminal of the third operational amplifier is correspondingly connected to the positive output terminal of the BUCK unit, the inverting input terminal of the third operational amplifier is correspondingly connected to the negative output terminal of the BUCK unit, and the output terminal of the third operational amplifier is connected to the second input terminal of the second operational amplifier subunit.

7. The high voltage output circuit according to claim 5, characterized in that: The second operational amplifier subunit comprises: A fourth operational amplifier, wherein the non-inverting input terminal of the fourth operational amplifier is connected to the first feedback adjustment unit, the second input terminal of the fourth operational amplifier is connected to the second voltage sampling subunit, and the output terminal of the fourth operational amplifier is correspondingly connected to the control unit.

8. The high voltage output circuit according to claim 5, characterized in that: Each of the second feedback adjustment units further includes: The isolation operational amplifier subunit, the first feedback adjustment unit is connected to the input end of the isolation operational amplifier subunit, and the output end of the isolation operational amplifier subunit is connected to the first input end of the second operational amplifier subunit.

9. The high voltage output circuit according to claim 1, characterized in that: Also includes: Multiple first rectifier units, the multiple first rectifier units correspond to the multiple transformer units, the input ends of the multiple first rectifier units are correspondingly connected to the first secondary windings of the multiple transformer units, and the output ends of the multiple first rectifier units are correspondingly connected to the input ends of the multiple BUCK units.

10. A power supply device, characterized in that: Comprising the high voltage output circuit as claimed in any one of claims 1 to 9.

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