A power control circuit and digital power system
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- CHONGQING DAQUAN TAILAI ELECTRIC CO LTD
- Filing Date
- 2025-06-30
- Publication Date
- 2026-07-07
Smart Images
Figure CN224473217U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of circuits, and in particular to a power control circuit and a digital power system. Background Technology
[0002] With the continuous development of digital control technology, the application of digital power supplies is becoming increasingly widespread. Digital power supplies deeply integrate power electronics technology with digital control, driving the development of power supplies towards greater intelligence and becoming one of the key technologies in energy transition. When using a digital power supply, a corresponding power control circuit is required. This circuit acquires the current output voltage or current of the digital power supply and then adjusts the output to the target voltage or current according to requirements. However, current digital power supply control circuits typically have limited sampling channels, usually only setting a single sampling point to acquire the current output voltage or current. This sampling may be inaccurate, resulting in low control precision. Therefore, improving the control precision of power supply control circuits has become an urgent technical problem to be solved. Utility Model Content
[0003] The purpose of this invention is to provide a power control circuit and a digital power system, with the aim of providing a power control circuit for a digital power system with higher precision.
[0004] To solve the above-mentioned technical problems, this utility model provides a power control circuit, including:
[0005] The sampling module, with its input end connected to the output end of the digital power supply, is used to sample the power supply voltage and / or power supply current output by the digital power supply using a detection component.
[0006] A control chip, with its input terminal connected to the output terminal of the sampling module; the control chip is used to generate corresponding control signals based on the sampling results of the sampling module.
[0007] The control chip integrates several multi-channel ADC modules, and all channels of the multi-channel ADC modules serve as sampling channels of the control chip. The sampling module includes several detection components that correspond one-to-one with several sampling channels of the control chip. The detection components are used to detect the power supply voltage or power supply current output by the digital power supply.
[0008] The signal output module has its input end connected to the output end of the control chip and is used to send the control signal to the digital power supply in the form of an optical signal.
[0009] Optionally, the detection component is a voltage transformer or a current transformer; the sampling module further includes:
[0010] The operational amplifier module, with its input terminal connected to the output terminal of the detection component, is used to amplify the sampling results of the voltage transformer or current transformer;
[0011] The differential module has its input terminal connected to the output terminal of the operational amplifier module and its output terminal connected to the input terminal of the control chip. It is used to convert the amplified sampling result into a differential signal.
[0012] Optionally, the operational amplifier module includes:
[0013] The first inductor has its first end connected to the output end of the detection component;
[0014] The first current limiting module has its first terminal connected to the second terminal of the first inductor;
[0015] The first filtering module has its first end connected to the second end of the first current limiting module;
[0016] The first operational amplifier has its non-inverting input terminal connected to the second terminal of the first filter module;
[0017] The second current limiting module has its first terminal connected to the output terminal of the first operational amplifier and the inverting input terminal of the first operational amplifier, respectively.
[0018] The second operational amplifier has its non-inverting input grounded.
[0019] The first feedback resistor has its first end connected to the second end of the second current limiting module and the inverting input of the second operational amplifier, and its second end connected to the output of the second operational amplifier, serving as the output of the operational amplifier module.
[0020] Optionally, the differential module includes:
[0021] The third current limiting module has its first terminal connected to the output terminal of the operational amplifier module.
[0022] The fourth current limiting module has its first terminal grounded.
[0023] Differential amplifier;
[0024] The first end of the second feedback resistor is connected to the second end of the third current limiting module and the non-inverting input of the differential amplifier, respectively.
[0025] The first end of the third feedback resistor is connected to the second end of the fourth current limiting module and the inverting input of the differential amplifier, respectively.
[0026] The second filter module has its first terminal connected to the second terminal of the second feedback resistor and the positive output terminal of the differential amplifier, respectively, and its second terminal serves as the first output terminal of the differential module.
[0027] The first terminal of the third filtering module is connected to the second terminal of the third feedback resistor and the negative output terminal of the differential amplifier, respectively, and the second terminal serves as the second output terminal of the differential module.
[0028] Optionally, the detection component includes:
[0029] Differential resistor;
[0030] First TVS tube;
[0031] The fifth current limiting module has its first terminal connected to the first terminal of the differential resistor, the first terminal of the first TVS transistor, and the positive output terminal of the digital power supply, respectively.
[0032] The sixth current limiting module has its first terminal connected to the second terminal of the differential resistor, the second terminal of the first TVS transistor, and the negative output terminal of the digital power supply, respectively.
[0033] The fourth filter module has its first terminal grounded.
[0034] The third operational amplifier has its non-inverting input terminal connected to the second terminal of the fourth filter module and the second terminal of the fifth current limiting module, respectively, and its output terminal serves as the output terminal of the detection component.
[0035] Compensation resistor;
[0036] The compensation capacitor has its first end connected to the inverting input terminal of the third operational amplifier, the second end of the sixth current limiting module, and the first end of the compensation resistor, respectively, and its second end connected to the output terminal of the third operational amplifier and the second end of the compensation resistor, respectively.
[0037] Optionally, the control signal is a PWM signal; the signal output module includes:
[0038] Pull-down resistor, first terminal grounded;
[0039] The driver has its first input terminal connected to the second terminal of the pull-down resistor and the output terminal of the control chip, respectively, and its second input terminal connected to a first preset power supply.
[0040] An optical fiber transceiver, with its input end connected to the output end of the driver, is used to convert the PWM signal processed by the driver into an optical signal and send it to the digital power supply.
[0041] Optional, also includes:
[0042] The power module has an input terminal connected to a power supply, and its output terminals are respectively connected to the power terminals of the sampling module, the control chip, and the signal output module, for supplying power to the sampling module, the control chip, and the signal output module, respectively.
[0043] Optional, also includes:
[0044] A digital input module has an input terminal connected to a host computer and an output terminal connected to the input terminal of the control chip. It is used to acquire digital signals sent by the host computer and output the digital signals to the control chip.
[0045] The switch output module has its input terminal connected to the output terminal of the control chip and its output terminal connected to the control terminal of the digital power supply's start switch. It is used to output the switch signal generated by the control chip to the start switch to control the digital power supply to turn on or off.
[0046] Optionally, the switch output module includes:
[0047] The fifth filtering module has its first end connected to the output end of the control chip;
[0048] A controllable switch, with its control terminal connected to the second terminal of the fifth filter module and its first terminal grounded;
[0049] The optocoupler has a first input terminal connected to a second preset power supply and connected to the second terminal of the controllable switch. The second input terminal is grounded, the first output terminal is connected to a third preset power supply, and the second output terminal is connected to the control terminal of the digital power supply's start switch.
[0050] To solve the above-mentioned technical problems, this utility model also provides a digital power supply system, including a digital power supply, a thyristor, and a power control circuit as described above. The output terminal of the digital power supply is connected to the anode of the thyristor, the output terminal of the power control circuit is connected to the control terminal of the thyristor, and the cathode of the thyristor serves as the output terminal of the digital power supply system.
[0051] The power control circuit is used to output control signals to adjust the trigger angle of the thyristor, so as to regulate the power supply voltage and / or power supply current output by the digital power system.
[0052] This invention provides a power control circuit, including a sampling module, a control chip, and a signal output module. The control chip integrates several multi-channel ADC modules, providing a sufficient number of sampling channels. The sampling module also includes multiple detection components corresponding to each sampling channel, enabling multi-channel sampling of the power supply voltage and current output from the digital power supply. This provides the control chip with a sufficient number of sampling results, improving sampling accuracy. Simultaneously, the control signal output by the control chip, after processing by the signal output module, is rapidly transmitted to the digital power supply via optical signals, improving the control response speed of the power control circuit and reducing its response time. Multi-channel sampling effectively improves the control accuracy of the power control circuit over the digital power supply, ensuring precise operation of the power controller.
[0053] This invention also provides a digital power supply system that has the same beneficial effects as the power control circuit described above. Attached Figure Description
[0054] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the prior art and embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0055] Figure 1 A schematic diagram of the structure of a power control circuit provided by this utility model;
[0056] Figure 2 A schematic diagram of another power control circuit provided by this utility model;
[0057] Figure 3 This is a schematic diagram of the structure of the first detection component provided by this utility model;
[0058] Figure 4 This is a schematic diagram of the structure of the second detection component provided by this utility model;
[0059] Figure 5 A schematic diagram of the structure of an operational amplifier module provided by this utility model;
[0060] Figure 6 A schematic diagram of the structure of a differential module provided by this utility model;
[0061] Figure 7 This is a schematic diagram of the structure of the third detection component provided by this utility model;
[0062] Figure 8A schematic diagram of the structure of a signal output module provided by this utility model;
[0063] Figure 9 A schematic diagram of the structure of a power module provided by this utility model;
[0064] Figure 10 A schematic diagram of the structure of a switch input module provided by this utility model;
[0065] Figure 11 A schematic diagram of the structure of a switch output module provided by this utility model;
[0066] Figure 12 This is a schematic diagram of the structure of a digital power supply system provided by this utility model. Detailed Implementation
[0067] The core of this invention is to provide a power control circuit and a digital power system, wherein the control chip has a sufficient number of sampling channels and high sampling accuracy.
[0068] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.
[0069] See Figure 1 As shown, Figure 1 This utility model provides a schematic diagram of a power control circuit; to solve the above-mentioned technical problems, this utility model provides a power control circuit, including:
[0070] Sampling module 1, with its input terminal connected to the output terminal of the digital power supply, is used to sample the power supply voltage and / or power supply current output by the digital power supply using a detection component;
[0071] The control chip 2 has its input terminal connected to the output terminal of the sampling module 1; the control chip 2 is used to generate corresponding control signals based on the sampling results of the sampling module 1.
[0072] The control chip 2 integrates several multi-channel ADC modules, and all channels of the multi-channel ADC modules are used as sampling channels of the control chip 2; the sampling module 1 includes several detection components that correspond one-to-one with several sampling channels of the control chip 2, and the detection components are used to detect the power supply voltage or power supply current output by the digital power supply.
[0073] The signal output module 3 has its input end connected to the output end of the control chip 2, and is used to send the control signal to the digital power supply in the form of an optical signal.
[0074] It's easy to understand that, to improve the control accuracy of power supply control circuits used in digital power supplies, the core control chip 2 is designed with several multi-channel ADC modules (Analog-Digital Converters). These multi-channel ADC modules provide a large number of sampling channels for the control chip 2, enabling it to process a sufficient number of sampling results simultaneously. Simultaneously, the sampling module 1 also incorporates multiple detection components, each capable of acquiring an independent power supply voltage or current sample from a single sampling point. This allows the control chip 2 to control the digital power supply using a sufficient number of sampling results, thereby improving the overall control accuracy of the circuit. A multi-channel ADC refers to an ADC with two or more input channels, typically a 16-bit ADC with 16 input channels or a 12-bit ADC with 12 input channels. The ADC module receives the sampling results from the detection components through the input channels and converts them into digital signals, which are then sent to the control chip 2.
[0075] Furthermore, to improve the response speed of the entire control circuit, control chip 2 can be implemented using a chip with a relatively high clock frequency, such as a 200MHz clock signal. Specifically, control chip 2 can be implemented using the TMS320F28377D chip. The TMS320F28377D chip has a dual-core design with a clock frequency of 200MHz, a large number of configurable pins, and internal multiple ADCs for sampling. It also uses a PWM channel to generate PWM (Pulse Width Modulation) signals as control signals. The PWM channel can efficiently achieve microsecond-level output, meeting the requirements of high precision, low cost, and fast response speed. The PWM signal has high resolution, and with the corresponding closed-loop control algorithm, it can accurately control the digital power supply based on the sampled current and voltage. In addition, this chip has a large number of peripheral interfaces and can be configured with various communication peripherals. By adopting this control chip 2 with multiple multi-channel ADCs, the problem of inaccurate sampling caused by insufficient sampling and output channels in general controllers can be solved. At the same time, since the 200MHz clock signal can achieve ultra-fast response at the microsecond level, when a fault occurs, the control chip 2 can react quickly and accurately, start the protection circuit to protect the digital power supply and the entire device, and can effectively store various waveforms at the time of the fault using communication peripherals to facilitate subsequent fault analysis.
[0076] It should be noted that this application does not make any special limitations on the specific types and implementation methods of the sampling module 1, the detection component, and the signal output module 3. The sampling module 1 is mainly used to accurately sample the AC voltage, DC voltage, AC current, and DC current in the digital power supply. It is not limited to the setting method of connecting to the output terminal of the digital power supply. The detection component can be configured according to the specific situation of the voltage or current to be detected. The signal output module 3 can be selected and adjusted according to the type of control signal. For example, when the control signal is a PWM signal, the signal output module 3 is implemented using a PWM output module.
[0077] Furthermore, the power control circuit can also include components such as a communication module 13 and a display screen, see [reference needed]. Figure 2 As shown, Figure 2 This is a schematic diagram of another power control circuit provided by this utility model. The entire power control circuit includes a control chip TMS320F28377D, a sampling module 1, a power module 15, a DI / DO module 11, a signal output module 3, an optical signal transmission module 12, a communication module 13, and a touch screen 14. The entire control process of the control chip 2 is data sampling → calling the control algorithm → outputting control signal adjustment. During the control process, it can communicate and interact with other devices such as a host computer through the communication module 13. The communication module 13 is used to realize the communication interaction between the power control circuit and external devices such as a host computer, so as to cooperate with external devices to realize remote monitoring and control of digital power supply. The communication module 13 can support multiple communication protocols such as CAN (Controller Area Network), RS485, TCP / IP (Transmission Control Protocol / Internet Protocol), and SPI (Serial Peripheral Interface) to cooperate with different external devices to realize control. The touch screen 14 communicates with the control chip 2 to display various power parameters and operating status of the current digital power system in real time, allowing operators to adjust and modify parameters promptly. The optical signal transmission module 12 can be implemented using optical fiber or other methods.
[0078] This invention provides a power control circuit for digital power systems, which can effectively achieve precise voltage / current regulation in digital power systems. By configuring a control chip 2, it can realize functions such as real-time monitoring, fault protection, fault recording, and communication control. It solves the problems of slow response time, low control accuracy, untimely and inaccurate monitoring of system operation status and faults, and limited sampling channels of traditional controllers. The entire power control circuit can be configured with multiple functions according to needs. It has the advantages of fast response time, high regulation accuracy, multiple sampling input channels and control signal output channels, and support for multiple communication protocols. It can meet the needs of various power systems and is suitable for fields such as industrial automation and new energy equipment.
[0079] Based on the above embodiments:
[0080] See Figure 3 As shown, Figure 3 This is a schematic diagram of the structure of the first detection component provided by this utility model; see also Figure 4 As shown, Figure 4 This is a schematic diagram of the structure of the second detection component provided by this utility model; as an optional embodiment, the detection component is a voltage transformer VT or a current transformer CT; the sampling module 1 further includes:
[0081] The operational amplifier module, with its input connected to the output of the detection component, is used to amplify the sampling results of the voltage transformer VT or the current transformer CT.
[0082] The differential module has its input connected to the output of the operational amplifier module and its output connected to the input of the control chip 2. It is used to convert the amplified sampling result into a differential signal.
[0083] It is easy to understand that sampling module 1 needs to be equipped with several detection components to cooperate with the multi-channel ADC module in control chip 2 to achieve multi-channel current sampling and multi-channel voltage sampling. Specifically, for high voltage or high current in a digital power supply system, the detection components can use voltage transformers VT to achieve voltage sampling, and current transformers CT to achieve current sampling. The sampling results from the detection components are further input to the operational amplifier module and the differential module. The operational amplifier module amplifies the sampling results, and the differential module converts them. The converted results are fed back to control chip 2 through the ADC interface. By using voltage transformers VT or current transformers CT to convert the high voltage or high current of the digital power supply into the sampling range supported by control chip 2, sampling module 1 and control chip 2 can effectively cooperate to achieve accurate sampling of AC current, DC current, AC voltage, and DC voltage in the digital power supply system. This application does not make any special limitations on the specific types and implementation methods of voltage transformers VT, current transformers CT, operational amplifier modules, and differential modules. Figure 3As shown, the voltage transformer VT can use a 100V / 6V ratio. The Gnd terminal of the primary side of the voltage transformer VT is grounded, and NC is connected to the corresponding voltage sampling point. V_BL represents the sampling result of the voltage transformer VT and is connected to the input of the operational amplifier module. Furthermore, a parallel capacitor C25 can be added between the two output terminals of the secondary side of the voltage transformer VT to improve the stability and accuracy of the sampling results. Figure 4 As shown, the current transformer (CT) can use a 6A / 3.53V ratio. The Gnd terminal of the primary side of the CT is grounded, the NC terminal is connected to the corresponding current sampling point, and C_BL represents the sampling result of the CT, connected to the input of the operational amplifier module. Furthermore, a parallel capacitor C26 can be added between the two output terminals of the secondary side of the CT to improve the stability and accuracy of the sampling results. It should be noted that the power supply control circuit will include multiple... Figure 3 The voltage transformer VT shown and as follows Figure 4 The current transformer (CT) shown can be configured with a corresponding op-amp module and differential module for each voltage transformer (VT), and a corresponding op-amp module and differential module for each current transformer (CT). Alternatively, multiple or all voltage transformers (VT) and current transformers (CT) can share a set of op-amp modules and differential modules for signal processing.
[0084] Specifically, sampling module 1 can use a voltage transformer VT to sample the voltage and a current transformer CT to sample the current. By selecting an appropriate transformation ratio, it can be ensured that the signal received by control chip 2 is within its supported sampling range, thereby achieving effective detection of each voltage sampling point and each current sampling point.
[0085] See Figure 5 As shown, Figure 5 A schematic diagram of an operational amplifier module provided by this utility model; as an optional embodiment, the operational amplifier module includes:
[0086] The first inductor L1 has its first end connected to the output end of the detection component;
[0087] The first current limiting module RX1 has its first terminal connected to the second terminal of the first inductor L1;
[0088] The first filtering module has its first end connected to the second end of the first current limiting module RX1;
[0089] The non-inverting input terminal of the first operational amplifier A1 is connected to the second terminal of the first filter module.
[0090] The second current limiting module RX2 has its first terminal connected to the output terminal and the inverting input terminal of the first operational amplifier A1, respectively.
[0091] The second operational amplifier A2 has its non-inverting input terminal grounded.
[0092] The first feedback resistor Rf1 has its first end connected to the second end of the second current limiting module RX2 and the inverting input of the second operational amplifier A2, and its second end connected to the output of the second operational amplifier A2, serving as the output of the operational amplifier module.
[0093] It is understandable that the operational amplifier module can be implemented using a first operational amplifier A1, a second operational amplifier A2, and corresponding peripheral circuitry. The sampling result from the voltage transformer VT or the current transformer CT is used as the sampling signal SAMPLE_IN and input to the operational amplifier module. The output of the first operational amplifier A1 is directly connected to the inverting input, with the input impedance approaching infinity and the output impedance approaching zero. This isolates high-impedance signal sources, prevents the sampling result from attenuating due to load effects, and preserves the original signal characteristics. The sampling result processed by the first operational amplifier A1 is then input to the second operational amplifier A2. The output of the second operational amplifier A2 is connected to the inverting input through a first feedback resistor Rf1. By configuring the value of the first feedback resistor Rf1, the signal amplitude can be adjusted as needed to achieve proportional amplification of the sampling result. Simultaneously, corresponding current limiting modules are set at the inputs of both the first operational amplifier A1 and the second operational amplifier A2 to limit the current input to the corresponding operational amplifier, protecting the components and the entire circuit. A first inductor L1 is set at the input of the operational amplifier module to block high-frequency noise from entering the circuit. To reduce interference, a first filtering module is designed to further filter out noise and other interference signals in the sampling results, thereby improving the accuracy and reliability of the entire processing. This application does not specifically limit the specific types and implementation methods of the first inductor L1, the first current limiting module RX1, the first filtering module, the first operational amplifier A1, the second current limiting module RX2, the second operational amplifier A2, and the first feedback resistor Rf1. Figure 5 As shown, the first filtering module is implemented using resistor R11 and capacitor C11. The power supply terminal of the first operational amplifier A1 is connected to a +15V power supply and a grounding capacitor C1301. The ground terminal of the first operational amplifier A1 is connected to a -15V power supply and a grounding capacitor C1321. A capacitor C1291 is also added between the output terminal of the first operational amplifier A1 and the input terminal of the first filtering module to further improve the accuracy and stability of the output signal of the first operational amplifier A1.
[0094] Specifically, the sampling signal is effectively amplified by the cooperation of the first operational amplifier A1 and the second operational amplifier A2. At the same time, with the cooperation of the corresponding peripheral circuits, the circuit stability and anti-interference capability of the entire operational amplifier module are guaranteed. The structure is simple and easy to implement.
[0095] See Figure 6 As shown, Figure 6 A schematic diagram of a differential module provided by this utility model; as an optional embodiment, the differential module includes:
[0096] The third current limiting module RX3 has its first terminal connected to the output terminal of the operational amplifier module.
[0097] The fourth current limiting module RX4 has its first terminal grounded.
[0098] Differential amplifier U111;
[0099] The first end of the second feedback resistor Rf2 is connected to the second end of the third current limiting module RX3 and the non-inverting input of the differential amplifier U111, respectively.
[0100] The first end of the third feedback resistor Rf3 is connected to the second end of the fourth current limiting module RX4 and the inverting input of the differential amplifier U111, respectively.
[0101] The first terminal of the second filter module is connected to the second terminal of the second feedback resistor Rf2 and the positive output terminal of the differential amplifier U111, respectively, and the second terminal serves as the first output terminal of the differential module.
[0102] The first terminal of the third filter module is connected to the second terminal of the third feedback resistor Rf3 and the negative output terminal of the differential amplifier U111, respectively, and the second terminal serves as the second output terminal of the differential module.
[0103] It's easy to understand that, to ensure the amplified sampling signal can be accurately and effectively transmitted to control chip 2, the amplified sampling signal SAMPLE_B output from the driver module is input to the differential module. The amplified sampling signal SAMPLE_B is then directly connected to the non-inverting input of differential amplifier U111 via the third current-limiting module RX3. The inverting input of differential amplifier U111 is grounded via the fourth current-limiting module RX4, thus converting the amplified sampling signal SAMPLE_B into a set of differential signals (SAMPLE_P and SAMPLE_N), which are then input to control chip 2. Feedback resistors are provided between the two outputs and corresponding inputs of differential amplifier U111. This negative feedback improves the anti-interference capability of differential amplifier U111. Simultaneously, filtering modules are provided at both outputs to filter out noise in the differential signals, improving their accuracy and reliability. This application does not impose any specific limitations on the specific types and implementation methods of the third current limiting module RX3, the fourth current limiting module RX4, the differential amplifier U111, the second feedback resistor Rf2, the third feedback resistor Rf3, the second filter module, and the third filter module. Figure 6As shown, the second filter module is implemented using inductor L21 and capacitor C21, and the third filter module is implemented using inductor L31 and capacitor C31. The common terminal Vocm of the differential amplifier U111 is connected to a +1.5V power supply and also to ground capacitor C1271. The positive terminal Vs+ is connected to a +5V power supply and also to ground capacitor C1261. The negative terminal Vs- is connected to a -5V power supply and also to ground capacitor C1331. Both differential signals are connected to their corresponding grounding diodes D111 and D121.
[0104] Specifically, by converting the sampled signal into a differential signal, the strong anti-common-mode interference capability of the differential signal is utilized to effectively suppress electromagnetic interference and radiation during signal transmission, improve signal integrity and transmission distance, and enhance the signal-to-noise ratio; it also improves the accuracy and reliability of the control chip 2 when receiving the sampled signal. The structure is simple and easy to implement.
[0105] See Figure 7 As shown, Figure 7 A schematic diagram of the structure of the third detection component provided by this utility model; as an optional embodiment, the detection component includes:
[0106] Differential resistor R0;
[0107] First TVS tube TVS1;
[0108] The fifth current limiting module has its first terminal connected to the first terminal of the differential resistor R0, the first terminal of the first TVS transistor TVS1, and the positive output terminal of the digital power supply, respectively.
[0109] The sixth current limiting module has its first terminal connected to the second terminal of the differential resistor R0, the second terminal of the first TVS transistor TVS1, and the negative output terminal of the digital power supply, respectively.
[0110] The fourth filter module has its first terminal grounded.
[0111] The third operational amplifier A3 has its non-inverting input terminal connected to the second terminal of the fourth filter module and the second terminal of the fifth current limiting module, respectively, and its output terminal serves as the output terminal of the detection component.
[0112] Compensation resistor RC1;
[0113] The first end of the compensation capacitor C0 is connected to the inverting input of the third operational amplifier A3, the second end of the sixth current limiting module, and the first end of the compensation resistor RC1, respectively. The second end is connected to the output of the third operational amplifier A3 and the second end of the compensation resistor RC1, respectively.
[0114] It is understandable that when the voltage or current at the sampling point is relatively small, discrete components can be used to build the circuit to implement the detection component. +IN is connected to the positive output terminal of the digital power supply, and -IN is connected to the negative output terminal. A differential resistor R0 and the first TVS transistor TVS1 are connected in parallel between the two input terminals to effectively protect the circuit and prevent overvoltage and other abnormal situations. The two sampling signals are respectively connected to the non-inverting and inverting input terminals of the third operational amplifier A3 through corresponding current limiting modules. The output terminal of the third operational amplifier A3 is fed back to the inverting input terminal through a compensation resistor RC1 and a compensation capacitor C0 to improve the phase margin. A grounded fourth filter module is also set at the non-inverting input terminal to filter out noise and other interference signals in the sampling signal. This application does not specifically limit the specific types and implementation methods of the differential resistor R0, the first TVS transistor TVS1, the fifth current limiting module, the sixth current limiting module, the fourth filter module, the third operational amplifier A3, the compensation resistor RC1, and the compensation capacitor C0. Figure 7 As shown, grounded TVS transistors TVS2 and TVS3 can be further added to the non-inverting input terminal to further protect the circuit; the fifth current limiting module is implemented using two resistors RX51 and RX52 connected in series, and the sixth current limiting module is implemented using two resistors RX61 and RX62 connected in series; the fourth filtering module is implemented using a parallel resistor R41 and a capacitor C41; the power supply terminal of the third operational amplifier A3 is connected to a +5V power supply and a grounding resistor C1 is connected, and the grounding terminal is grounded; the output terminal is further filtered by a resistor R7 and a grounding capacitor C3; finally, the signal SYN of the output terminal VOUT is sent to the control chip 2.
[0115] Specifically, using discrete components to build the circuit to realize the detection component can effectively realize the detection of small voltages and / or small currents in digital power supply systems. It has a simple structure, is easy to implement, has low cost, higher design flexibility, and is easy to maintain.
[0116] See Figure 8 As shown, Figure 8 A schematic diagram of a signal output module provided by this utility model; as an optional embodiment, the control signal is a PWM signal; the signal output module 3 includes:
[0117] Pull-down resistor, first terminal grounded;
[0118] The first input terminal of the driver S0 is connected to the second terminal of the pull-down resistor and the output terminal of the control chip 2, respectively, and the second input terminal is connected to the first preset power supply.
[0119] The fiber optic transceiver, with its input end connected to the output end of driver S0, is used to convert the PWM signal processed by driver S0 into an optical signal and send it to the digital power supply.
[0120] Understandably, after receiving the sampling signal, control chip 2 generates a corresponding PWM signal as a control signal. It adjusts the PWM duty cycle to regulate the optical signal pulse output and the trigger angle of the thyristor in the digital power system to regulate the voltage and current. Combined with phase-locked loop (PLL) algorithms, PID open-loop and closed-loop control algorithms, it ensures the voltage and current in the digital power system reach the desired target values. Signal output module 3, in conjunction with optical signal transmission module 12, sends the PWM signal to the digital power supply to control it. To achieve fast signal transmission, the power control circuit connects to fiber optic output to send control signals via optical signals. Therefore, signal output module 3 includes a driver S0 to improve the driving capability of the PWM signal. A pull-down resistor is also installed at the input of the PWM signal to stabilize the signal level, eliminate pin floating, and prevent false triggering. This, along with driver S0, optimizes the driving capability of the PWM signal and ensures its reliability. The output signal of driver S0 is sent to the fiber optic transceiver to convert the PWM signal into an optical signal. Figure 8 As shown, Figure 8 The diagram illustrates how control chip 2 simultaneously generates two PWM signals. The first PWM signal, PWM1, is connected to logic input 1B of driver S0, with a pull-down resistor Rp1, and the fiber optic transceiver is HRBR1. The second PWM signal, PWM2, is connected to another logic input 2B of driver S0, with a pull-down resistor Rp2, and the fiber optic transceiver is HRBR2. Driver S0's power supply is connected to +5V, and its ground terminal is grounded. The other two logic inputs, 1A and 2A, are both connected to +5V via resistor R43. HRBR1's input also includes resistor R48 and grounding capacitor C5, while HRBR2's input includes resistor R49 and grounding capacitor C6 for further filtering and improved signal accuracy.
[0121] Specifically, the control signal is implemented using PWM signals, and the control chip 2 generates two PWM signals simultaneously to generate the control signal, which can ensure fast, reliable and accurate control of the digital power supply. At the same time, an optical transceiver is configured to realize optical signal transmission, which effectively improves the response speed of the entire control circuit.
[0122] See Figure 9 As shown, Figure 9 A schematic diagram of the structure of a power module provided by this utility model; as an optional embodiment, it further includes:
[0123] The power module 15 has an input terminal connected to a power supply, and its output terminals are connected to the power terminals of the sampling module 1, the control chip 2, and the signal output module 3, respectively, to supply power to the sampling module 1, the control chip 2, and the signal output module 3.
[0124] It is easy to understand that each module in the power control circuit requires a corresponding power supply voltage to operate effectively. Therefore, the power control circuit can also be configured with a power supply module 15 to supply power to each module in the power control circuit and provide a stable operating voltage. The power supply terminals of the sampling module 1 include, but are not limited to, the power supply terminals of each operational amplifier and differential amplifier U111 therein. The power supply terminals of the signal output module 3 include, but are not limited to, the power supply terminal of the driver S0. This application does not specifically limit the specific type and implementation method of the power supply module 15. It can be implemented through the cooperation of DC / DC (Direct Current / Direct Current) conversion circuits and input filtering modules. The specific values of the power supply and the output voltage of the power supply module 15 can be set and adjusted according to actual needs, such as 3.3V, 5V, and 24V. Figure 9 As shown, the power module 15 is implemented using a power chip U10, which can generate 3.3V and 1.2V voltages using a +5V power supply. The power chip is equipped with capacitors C95, C96, C103, C104, C97, C98, C99, C100, C101, C102 and resistor R50.
[0125] Specifically, by setting up the power supply module 15, we can ensure that each module in the power control circuit can obtain an effective and stable operating voltage, thus ensuring that the entire power control circuit can work normally.
[0126] As an optional embodiment, it also includes:
[0127] The digital input module has its input end connected to the host computer and its output end connected to the input end of the control chip 2. It is used to acquire the digital signals sent by the host computer and output the digital signals to the control chip 2.
[0128] The switch output module has its input terminal connected to the output terminal of the control chip 2 and its output terminal connected to the control terminal of the digital power supply's start switch. It is used to output the switch signal generated by the control chip 2 to the start switch to control the digital power supply to turn on or off.
[0129] It is understandable that, considering the presence of switching control functions in digital power supply systems, such as turning the digital power supply on or off, and activating or deactivating protection circuits, these switching controls can be implemented by controlling the activation of relays, thereby controlling and monitoring the status of other devices in the digital power supply system. Therefore, the power control circuit will also include a switching input module (DI module) and a switching output module (DO module). The control chip 2 uses the DI module to collect switching signals to determine the status of other devices and detect whether they have met the predetermined conditions for normal operation. After the predetermined conditions are met and phase-locked loop is completed, the control chip 2 sends a switching signal through the DO module to control the digital power supply to start. The control chip 2 then begins operation after receiving the corresponding start signal. The switching control function in the digital power supply system can also be used for other operations, including but not limited to the content of this embodiment. This application does not impose any special limitations on this, and it can also be used to trigger specific alarm signals in the digital power supply system to implement protection mechanisms, etc.
[0130] Further, see Figure 10 As shown, Figure 10 This utility model provides a schematic diagram of the structure of a switch input module. Status monitoring and other switch signals are input as the switch input signal DI_IN to the switch input module. After passing through resistor R01, the signal is transmitted to an optocoupler U1. The other input terminal of optocoupler U1 is connected to DI_COM, which can be achieved through grounding in the control chip 2. One output terminal of optocoupler U1 is connected to a 3.3V voltage, and the other output terminal, after passing through resistor RO2 and capacitor CO1, generates the signal DI_OUT. This signal is output to the corresponding switch receiving pin in the control chip 2.
[0131] Specifically, by further configuring the DI / DO module 11, the switching control of other devices such as protection circuits and alarm circuits in the digital power system can be realized through the cooperation of the switching quantity and the control chip 2, thereby improving the automation of the digital power system and ensuring the effective realization of functions such as alarm mechanism and protection mechanism in the digital power system.
[0132] See Figure 11 As shown, Figure 11 A schematic diagram of a switch output module provided by this utility model; as an optional embodiment, the switch output module includes:
[0133] The fifth filtering module has its first end connected to the output end of control chip 2;
[0134] A controllable switch, with its control terminal connected to the second terminal of the fifth filter module and its first terminal grounded;
[0135] The optocoupler has a first input terminal connected to a second preset power supply and connected to the second terminal of a controllable switch. The second input terminal is grounded. The first output terminal is connected to a third preset power supply. The second output terminal is connected to the control terminal of the digital power supply's start switch.
[0136] It is understandable that a switch output module can specifically use a combination of controllable switches and optocouplers to achieve switch output. For example... Figure 11 As shown, the controllable switch is implemented using a multi-level control structure composed of multiple switches. The switch signal DO_IN is sent by the switch signal transmission pin of the control chip 2. After passing through the fifth filter module composed of resistor R51 and capacitor C51, it is input to the control terminal of the first switch Q1. A resistor R52 is set between the control terminal and the first terminal of the first switch Q1 to provide a stable operating point for the first switch Q1. The second terminal of the first switch Q1 is connected to the control terminal of the second switch Q2, and is also connected to the +5V power supply voltage through resistor R53. One terminal of the second switch Q2 is also connected to the +5V power supply voltage through resistor R54. The +5V power supply voltage is connected to the ground capacitor C02. The two ends of the second switch Q2 are connected in parallel to the two input terminals of another optocoupler U0. The first output terminal of optocoupler U0 is connected to a +24V power supply and a grounding capacitor CO3. The second output terminal is connected to one end of the coil of relay K1, and the other end of the coil is grounded and connected to the second output terminal of optocoupler U0 through diode D1. The switching signal DO_IN is transmitted through the controllable switch and optocoupler U0, controlling the relay to open or close, thereby outputting the corresponding switching signal DO_OUT. DO_COM, as the common output terminal, can be grounded or connected to a power supply by connecting to control chip 2, etc., to cooperate with the relay to achieve the output of the switching signal DO_OUT.
[0137] Specifically, the transmission of switching signals can be achieved through a combination of switching devices. The specific types and implementation methods of the first switch, the second switch, and the optocoupler can be flexibly selected according to requirements. The structure is simple and easy to implement.
[0138] See Figure 12 As shown, Figure 12 This is a schematic diagram of a digital power supply system provided by this utility model. To solve the above-mentioned technical problems, this utility model also provides a digital power supply system, including a digital power supply DP, a silicon controlled rectifier (SCR), and a power control circuit as described above. The output terminal of the digital power supply DP is connected to the anode of the SCR, the output terminal of the power control circuit is connected to the control terminal of the SCR, and the cathode of the SCR serves as the output terminal of the digital power supply system.
[0139] The power control circuit is used to output control signals to adjust the trigger angle of the silicon controlled rectifier (SCR) in order to regulate the power supply voltage and / or power supply current output by the digital power supply system.
[0140] It is easy to understand that the control chip uses an ADC module to collect the current or voltage output from the digital power supply, and then generates a PWM signal as a control signal. The PWM signal is transmitted via optical signal to control the turn-on angle of the thyristor, thereby controlling the output of the digital power supply. This application does not impose any special limitations on the specific types of thyristors and digital power supplies, or their implementation methods.
[0141] For an introduction to the digital power supply system provided by this utility model, please refer to the above-described embodiment of the power control circuit; this utility model will not be described in detail here.
[0142] The various embodiments described in this specification are presented in a progressive manner, with each embodiment focusing on its differences from other embodiments. Similar or identical parts between embodiments can be referred to interchangeably. It should also be noted that in this specification, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.
[0143] The above description of the disclosed embodiments enables those skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims
1. A power control circuit, characterized by comprising: The application relates to a digital power supply control device. The device comprises a sampling module, a control chip and a signal output module. The sampling module is connected with the output end of a digital power supply and is used for sampling the power supply voltage and / or the power supply current output by the digital power supply. The control chip is connected with the output end of the sampling module and is used for generating a corresponding control signal based on the sampling result of the sampling module. The control chip is integrated with a plurality of multi-channel ADC modules, and all the channels of the multi-channel ADC modules are used as sampling channels of the control chip.
2. The power control circuit of claim 1, wherein The sampling module comprises a plurality of detection components corresponding to the sampling channels of the control chip, and the detection components are used for detecting the power supply voltage or the power supply current output by the digital power supply. The signal output module is connected with the output end of the control chip and is used for sending the control signal in the form of an optical signal to the digital power supply. The detection component is a voltage transformer or a current transformer.
3. The power control circuit of claim 2, wherein, The sampling module further comprises an operational amplifier module and a differential module. The operational amplifier module is connected with the output end of the detection component and is used for amplifying the sampling result of the voltage transformer or the current transformer. The differential module is connected with the output end of the operational amplifier module and the input end of the control chip and is used for converting the amplified sampling result into a differential signal. The operational amplifier module comprises a first inductor, a first current limiting module, a first filter module, a first operational amplifier, a second current limiting module and a second operational amplifier. The first inductor is connected with the output end of the detection component. The first current limiting module is connected with the second end of the first inductor. The first filter module is connected with the second end of the first current limiting module. The same-phase input end of the first operational amplifier is connected with the second end of the first filter module.
4. The power control circuit of claim 3, wherein The first end of the second current limiting module is connected with the output end of the first operational amplifier and the opposite-phase input end of the first operational amplifier. The same-phase input end of the second operational amplifier is grounded. The first feedback resistor is connected with the second end of the second current limiting module and the opposite-phase input end of the second operational amplifier. The differential module comprises a third current limiting module, a fourth current limiting module, a differential amplifier, a second feedback resistor, a third feedback resistor, a second filter module and a third filter module. The first end of the third current limiting module is connected with the output end of the operational amplifier module. The first end of the fourth current limiting module is grounded. The differential amplifier is connected with the second end of the third current limiting module and the same-phase input end of the differential amplifier. The first end of the third feedback resistor is connected with the second end of the fourth current limiting module and the opposite-phase input end of the differential amplifier.
5. The power control circuit of claim 1, wherein, The first end of the second filter module is connected with the second end of the second feedback resistor and the positive output end of the differential amplifier. The first end of the third filter module is connected with the second end of the third feedback resistor and the negative output end of the differential amplifier. The detection component comprises a differential resistor, a first TVS tube and a fifth current limiting module. The first end of the fifth current limiting module is connected with the first end of the differential resistor, the first end of the first TVS tube and the positive output end of the digital power supply. A sixth current limiting module, a first end of which is connected with a second end of the differential resistor, a second end of the first TVS tube and a negative output end of the digital power supply respectively; A fourth filtering module, a first end of which is grounded; A third operational amplifier, a same-phase input end of which is connected with a second end of the fourth filtering module and a second end of the fifth current limiting module respectively, and an output end of which serves as an output end of the detection component; A compensation resistor; A compensation capacitor, a first end of which is connected with an inverse-phase input end of the third operational amplifier, a second end of the sixth current limiting module and a first end of the compensation resistor respectively, and a second end of which is connected with the output end of the third operational amplifier and a second end of the compensation resistor respectively.
6. The power control circuit of claim 1, wherein, The control signal is a PWM signal; the signal output module comprises: A pull-down resistor, a first end of which is grounded; A driver, a first input end of which is connected with a second end of the pull-down resistor and an output end of the control chip respectively, and a second input end of which is connected with a first preset power supply; An optical fiber transceiver, an input end of which is connected with an output end of the driver, for converting the PWM signal processed by the driver into an optical signal and sending the optical signal to the digital power supply.
7. The power control circuit of claim 1, wherein, Further comprising: A power supply module, an input end of which is connected with a power supply, and output ends of which are connected with a power supply end of the sampling module, a power supply end of the control chip and a power supply end of the signal output module respectively, for supplying power to the sampling module, the control chip and the signal output module respectively.
8. The power control circuit according to any one of claims 1 to 7, characterized by Further comprising: An on-off quantity input module, an input end of which is connected with an upper computer, and an output end of which is connected with an input end of the control chip, for obtaining an on-off quantity signal sent by the upper computer and outputting the on-off quantity signal to the control chip; An on-off quantity output module, an input end of which is connected with an output end of the control chip, and an output end of which is connected with a control end of a starting switch of the digital power supply, for outputting an on-off quantity signal generated by the control chip to the starting switch to control opening or closing of the digital power supply.
9. The power control circuit of claim 8, wherein, The on-off quantity output module comprises: A fifth filtering module, a first end of which is connected with an output end of the control chip; A controllable switch, a control end of which is connected with a second end of the fifth filtering module, and a first end of which is grounded; An optical coupler, a first input end of which is connected with a second preset power supply and a second end of the controllable switch, a second input end of which is grounded, a first output end of which is connected with a third preset power supply, and a second output end of which is connected with a control end of a starting switch of the digital power supply.
10. A digital power supply system characterized by, A digital power supply, a thyristor and a power supply control circuit according to any one of claims 1-9, an output end of the digital power supply is connected with an anode of the thyristor, an output end of the power supply control circuit is connected with a control end of the thyristor, and a cathode of the thyristor serves as an output end of the digital power supply system; The power supply control circuit is used for outputting a control signal to adjust a triggering angle of the thyristor, so as to adjust a power supply voltage and / or a power supply current output by the digital power supply system.