A control circuit for a direct current power supply

Abstract

A control circuit for DC power supply, comprising an anti-reverse connection module, a power module, an analog signal quantity processing module, a control module, a data transmission interface module, a switch isolation module and a relay switch acquisition module; the anti-reverse connection module adopts an ideal diode controller and a large-current MOS tube to form an ideal diode, the input end of the module is connected with an external power supply, and the output end of the module is connected with the power module; the power module can convert high voltage of the external power supply into low voltage; the analog signal quantity processing module can acquire current information of the external power supply and transmit the current information to the control module; the control module can control and record the power supply state of each load according to the control signal sent by the upper computer; the circuit is safe and reliable, and can control the power supply switching between multiple loads.

Description

Technical Field

[0001] This invention relates to the field of DC power supply technology, and in particular to a control circuit for a DC power supply. Background Technology

[0002] As is well known, a DC power supply is a power supply device that can provide a stable and constant current to multiple loads at the same time. However, for automated production lines, there are a large number of loads used, and the power supply switching between multiple loads is frequent. The traditional DC power supply switching method is still manual, which is inconvenient for automated production lines and too labor and material resources. If workers misoperate, it will affect the operation of the entire production line and increase maintenance costs. Chinese patent (CN113285518A) discloses a DC power supply system that connects a battery module to a bidirectional converter module, which in turn connects to a DC distribution bus. When the grid power supply is normal, the charging module charges the battery module via the DC distribution bus. When the grid power supply is abnormal, the battery module supplies power to the DC distribution bus in reverse via the bidirectional converter module, ensuring the normal operation of the DC loads on the DC distribution bus and effectively achieving safe discharge to the DC bus. Furthermore, even under abnormal grid power conditions, it ensures continuous power supply to the DC loads for extended periods, meeting the power requirements of downstream loads at the safety level and improving the safety and reliability of critical loads in nuclear power plants. However, while this system offers high security for grid power supply, it lacks the ability to implement switching control power supply functions in multi-load applications. Therefore, in summary, there is a current market need for a safe and reliable DC power supply that can control the power supply switching between multiple loads. Summary of the Invention

[0003] To overcome the shortcomings of the prior art, the present invention discloses a control circuit for a DC power supply.

[0004] To achieve the above-mentioned objectives, the present invention adopts the following technical solution: A control module for a DC power supply includes a reverse connection protection module, a power supply module, an analog signal processing module, a control module, a data transmission interface module, a switch isolation module, and a relay switch acquisition module. The reverse connection protection module uses an ideal diode controller and a high-current MOSFET to form an ideal diode. The input terminal of the module is connected to an external power supply, and the output terminal of the module is connected to a power supply module. The power module can convert the high voltage of the external power supply into the low voltage of the adapter control module, data transmission interface module, relay switch acquisition module and switch isolation module. The analog signal processing module can collect current information from the external power supply and transmit it to the control module; The control module can control and record the power supply status of each load according to the control signals sent by the host computer. The control module is connected to the host computer through a data transmission interface module, and the control module is connected to multiple loads one by one through multiple switch isolation modules. The switch isolation modules can detect the power supply status of multiple loads, and the multiple switch isolation modules are connected to the control module through a relay switch acquisition module.

[0005] Preferably, the reverse connection protection module consists of a differential amplifier, two parallel ideal diode controllers, and a high-current MOSFET. The differential amplifier is connected to an external power supply, the output terminal of the differential amplifier is connected in series with the high-current MOSFET, the high-current MOSFET is connected to both parallel ideal diode controllers, and the two parallel ideal diode controllers are connected to the power supply module.

[0006] Preferably, the power module includes a low-voltage power supply circuit and an isolated power supply circuit, wherein the low-voltage power supply circuit includes a power supply unit M3, a DC-DC conversion control IC and a voltage regulator branch. The power supply unit M3 can convert the 28V voltage input from the external power supply into a 9V voltage output to the data transmission interface module, and the 9V voltage can be converted into a 3.3V voltage output to the control module through the DC-DC conversion control IC and the voltage regulator branch. The isolated power supply circuit includes a 600W isolated power supply branch and a 30W isolated power supply branch. The 600W isolated power supply branch is composed of a power supply unit M2 and a drive branch connected in series. The power supply unit M2 is used to convert the 28V voltage input from the external power supply into a 12V voltage output to the switch isolation module. The 30W isolated power supply branch consists of power supply unit M1 and peripheral circuits. Power supply unit M1 is used to convert the 28V voltage input from the external power supply into a 5V voltage output to the relay switch acquisition module.

[0007] Preferably, the data transmission interface module includes a communication chip and a differential-to-single-ended conversion circuit. The communication chip is used to receive control signals, and the conversion circuit can transmit the control signals to the control module in a single-ended manner.

[0008] Preferably, the control module includes an ADC converter and a processor, wherein the ADC converter is used to receive control signals and can convert analog control signals into digital signals and transmit them to the processor, and the processor controls the power supply of each load through the load switch control module according to the digital control signals.

[0009] Preferably, the analog signal processing module includes a sampling resistor, a current detection chip, a voltage reference circuit, a voltage divider resistor, a four-to-one switch, a four-to-one analog switch, and an optocoupler isolation controller. The sampling resistor is connected to an external power supply. The current detection chip converts the current signal flowing through the sampling resistor into a voltage signal. The current detection chip can output two battery signals, each converted into a sampling voltage by a voltage divider resistor. The voltage reference circuit outputs a reference voltage signal to the current detection chip. The voltage signal, the two sampling voltages, and the reference voltage signal are input to the four-to-one analog switch. The optocoupler isolation controller controls the output of the four-to-one analog switch. The output of the four-to-one analog switch, the voltage signal, and the two sampling voltages are input to the four-to-one switch. The output of the four-to-one switch is connected to the control module.

[0010] Preferably, the switch isolation module includes two P-channel MOSFETs, four N-channel MOSFETs, and an optocoupler circuit. The two P-channel MOSFETs are set as positive terminals and connected to the control module. The two P-channel MOSFETs are respectively connected to the two N-channel MOSFETs. The four N-channel MOSFETs are set as negative terminals and are respectively connected to the relay switch acquisition module and the corresponding load through the optocoupler circuit.

[0011] Preferably, the relay switch acquisition module includes two relays, an opto-isolation coupler, and a MOSFET. The two relays are connected to multiple switch isolation modules to detect changes in the operation of the switch isolation modules. The opto-coupler amplifies the digital signal output by the relays and transmits it to the control module via the MOSFET.

[0012] By employing the technical solution described above, the present invention has the following beneficial effects: This invention discloses a control module for a DC power supply. It collects the operating information of each load through a relay switch acquisition module and the external power supply status information through an analog signal processing module, and transmits this information back to the control module to achieve signal feedback, thereby making the control circuit safer when supplying power. In addition, the safety of load operation is further improved by controlling the corresponding load actions through multiple switch isolation modules, and the power supply switching between multiple loads is realized. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of one structure of the present invention; Figure 2 A schematic diagram of the circuit structure for the reverse connection protection module; Figure 3 A schematic diagram of the circuit structure for a 28V to 9V power module; Figure 4This is a schematic diagram of the circuit structure for a 28V to 3.3V power module. Figure 5 This is a schematic diagram of the circuit structure for a 28V to 12V power module. Figure 6 A schematic diagram of the circuit structure for a 28V to 5V power module; Figure 7 This is a schematic diagram of the circuit structure of the analog signal processing module; Figure 8 This is a schematic diagram of the circuit structure of the control module; Figure 9 This is a schematic diagram of the circuit structure of the data transmission interface module; Figure 10 This is a schematic diagram of the circuit structure of the switch isolation module; Figure 11 This is a schematic diagram of the circuit structure of the relay switch acquisition module.

[0014] In the diagram: 1. Reverse connection protection module; 2. Power supply module; 3. Analog signal processing module; 4. Control module; 5. Data transmission interface module; 6. Switch isolation module; 7. Relay switch acquisition module. Detailed Implementation

[0015] The technical solution of the present invention will now be described with reference to the accompanying drawings of the embodiments of the present invention. In the description, it should be understood that the terms "upper," "lower," "front," "rear," "left," and "right," etc., indicating directions or positional relationships, are only used to correspond to the accompanying drawings of the present invention for the purpose of facilitating the description of the present invention, and are not intended to indicate or imply that the device or element referred to must have a specific orientation. Combined with appendix Figure 1-11 The control circuit for a DC power supply includes a reverse connection protection module 1, a power supply module 2, an analog signal processing module 3, a control module 4, a data transmission interface module 5, a switch isolation module 6, and a relay switch acquisition module 7. The reverse connection protection module 1 uses an ideal diode controller and a high-current MOSFET to form an ideal diode, which has the advantages of high reliability and low power consumption. The input terminal of the module is connected to an external power supply, and the output terminal of the module is connected to the power supply module 2. The reverse connection protection function of the circuit is realized through the unidirectional current transfer characteristic of the ideal diode. The ideal diode controller can rectify the circuit, while the MOSFET can regulate the voltage of the circuit, thereby effectively improving the stability of the power supply. The power module 2 can convert the high voltage of the external power supply into a low voltage that is compatible with the control module 4, the data transmission interface module 5, the relay switch acquisition module 7, and the switch isolation module 6. The analog signal processing module 3 can collect the current information of the external power supply and transmit it to the control module 4; The control module 4 can control and record the power supply status of each load according to the control signals sent by the host computer. The control module 4 is connected to the host computer through the data transmission interface module 5 to receive the control signals sent by the host computer. The control module 4 is connected to multiple loads one by one through multiple switch isolation modules 6. The multiple switch isolation modules 6 control the corresponding load actions respectively, which further improves the safety of load actions and realizes the power supply switching between multiple loads. The switch isolation modules 6 can detect the power supply status of multiple loads. The multiple switch isolation modules 6 are connected to the control module 4 through the relay switch acquisition module 7. The relay switch acquisition module 7 collects the operating information of each load, and the analog signal processing module 3 collects the external power supply status information. This information is then transmitted back to the control module 4 to achieve signal feedback, thereby making the control circuit safer when powered on.

[0016] Example 1: The reverse connection protection module 1 consists of a differential amplifier, two parallel ideal diode controllers, and a high-current MOSFET. The differential amplifier is connected to an external power supply, and its output terminal is connected in series with the high-current MOSFET. The high-current MOSFET is connected to both parallel ideal diode controllers, and the two parallel ideal diode controllers are connected to the power supply module. The characteristics of the differential amplifier can improve the accuracy and stability of the reverse connection protection module 1, thereby improving the stability of the power supply. In addition, by using multiple sets of ideal diodes in parallel, this module can have redundancy, further improving the safety and stability of the DC power supply.

[0017] Example 2 is as follows: The power module 2 includes a low-voltage power supply circuit and an isolated power supply circuit. The low-voltage power supply circuit includes a power supply unit M3, a DC-DC conversion control IC, and a voltage regulator branch. The power supply unit M3 can convert the 28V voltage input from the external power supply into a 9V voltage output to the data transmission interface module 5. The 9V voltage can be converted into a 3.3V voltage output to the control module 4 through the DC-DC conversion control IC and the voltage regulator branch. The DC-DC conversion control IC and the voltage regulator branch can perform noise reduction processing on the power supply voltage, thereby providing the 3.3V voltage to the control module 4 with high stability. The isolated power supply circuit includes a 600W isolated power supply branch and a 30W isolated power supply branch. The 600W isolated power supply branch is composed of a power supply unit M2 and a drive branch connected in series. The power supply unit M2 is used to convert the 28V voltage input from the external power supply into a 12V voltage output to the switch isolation module 6. The 30W isolated power supply branch consists of power supply unit M1 and peripheral circuits. Power supply unit M1 is used to convert the 28V voltage input from the external power supply into a 5V voltage output to the relay switch acquisition module 7.

[0018] Example 3 is as follows: The data transmission interface module 5 includes a communication chip and a differential-to-single-ended conversion circuit. The communication chip is used to receive control signals, and the conversion circuit can transmit the control signals to the control module 4 in a single-ended manner. The communication chip can also isolate the control signals. In addition, since the distance between the data transmission interface module 5 and the control module 4 is relatively far, using a single-ended method to transmit the control signals can improve the stability and anti-interference ability during signal transmission, and ensure the control accuracy of the subsequent control module 4.

[0019] Example 4 is as follows: The control module 4 includes an ADC converter and a processor. The ADC converter is used to receive control signals and can convert analog control signals into digital signals and transmit them to the processor. In addition, the ADC converter is externally connected to a reference voltage calibration circuit, which can improve the sampling accuracy of the ADC converter and improve the signal strength. The processor controls the power supply of each load through the load switch control module 4 according to the digital control signals.

[0020] Example 5 is as follows: The analog signal processing module 3 includes a sampling resistor, a current detection chip, a voltage reference circuit, a voltage divider resistor, a four-to-one switch, a four-to-one analog switch, and an optocoupler isolation controller. The sampling resistor is connected to an external power supply. The current detection chip converts the current signal flowing through the sampling resistor into a voltage signal. The current detection chip can output two battery signals, and the two battery signals are converted into sampling voltages through a voltage divider resistor. The voltage reference circuit can output a reference voltage signal to the current detection chip. The voltage signal, the two sampled voltages, and the reference voltage signal are respectively input to the four-to-one analog switch. The reference voltage signal is used to eliminate the influence of factors such as temperature and drift, and improve accuracy. The optocoupler isolation controller is used to control the output of the four-to-one analog switch. The output terminal of the four-to-one analog switch, the voltage signal, and the two sampled voltages are input to the four-to-one switching switch. The output terminal of the four-to-one switching switch is connected to the control module 4. Since the optocoupler isolation controller has the advantage of high impedance, it has strong anti-interference ability and can improve the stability of signal output.

[0021] Example 6: The switch isolation module 6 includes two P-channel MOSFETs, four N-channel MOSFETs, and an optocoupler circuit. The two P-channel MOSFETs are set as positive terminals and connected to the control module 4. The two P-channel MOSFETs are respectively connected to the two N-channel MOSFETs. The four N-channel MOSFETs are set as negative terminals and are connected to the relay switch acquisition module 7 and the corresponding load respectively through the optocoupler circuit. This switch isolation module 6 adopts a two-set parallel redundant design, which can shunt the current, thereby improving the reliability of the module circuit and reducing heat generation.

[0022] Example 7: The relay switch acquisition module 7 includes two relays, an opto-isolation coupler, and a MOSFET. The two relays are connected to multiple switch isolation modules 6 to detect changes in the operation of the switch isolation modules 6. The opto-coupler amplifies the digital signal output by the relays and transmits it to the control module 4. The activation of the relays determines which switch isolation module 6 is open and which load is powered. In addition, the opto-isolation coupler detects the activation status of the relays, and finally, the MOSFET amplifies the signal output by the opto-coupler and feeds it back to the control module 4 to determine whether the load is being powered correctly.

[0023] When implementing the control circuit for a DC power supply according to the present invention, the host computer first sends specific load power supply control information, such as the specific power supply time and power-off time for each load. Then, the control information is transmitted to the control module through the data transmission module. The processor in the control module analyzes and processes the control information and outputs control signals to the isolating switch at intervals, thereby specifically controlling the power supply status of the load. At the same time, the external power supply supplies power to each module through the reverse connection protection module and the power supply module's voltage reduction. In addition, the relay switch acquisition module collects the working information of each load in real time, and the analog signal processing module collects the status information of the external power supply in real time, and transmits this information back to the control module. The control module compares the control information from the host computer with the feedback control signals to achieve feedback comparison between signals, making the control circuit safer during power supply and more accurate in controlling the working process of the load.

[0024] The parts of this invention not described in detail are prior art. It will be apparent to those skilled in the art that this invention is not limited to the details of the above exemplary embodiments, and that the invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments should be regarded as exemplary and non-limiting in all respects. The scope of this invention is defined by the appended claims rather than the foregoing description. Therefore, it is intended to include all changes that fall within the meaning and scope of the equivalents of the claims within this invention, and no reference numerals in the claims should be regarded as limiting the scope of the claims.

Claims

1. A control circuit for a DC power supply, characterized in that: It includes a reverse connection protection module (1), a power supply module (2), an analog signal processing module (3), a control module (4), a data transmission interface module (5), a switch isolation module (6), and a relay switch acquisition module (7). The reverse connection protection module (1) is composed of an ideal diode controller and a high-current MOSFET. The input terminal of the module is connected to an external power supply, and the output terminal of the module is connected to the power supply module (2). The power module (2) can convert the high voltage of the external power supply into the low voltage of the adapter control module (4), the data transmission interface module (5), the relay switch acquisition module (7) and the switch isolation module (6); The analog signal processing module (3) can collect the current information of the external power supply and transmit it to the control module (4). The control module (4) can control and record the power supply status of each load according to the control signal sent by the host computer; wherein the control module (4) is connected to the host computer through the data transmission interface module (5), and the control module (4) is connected to multiple loads one by one through multiple switch isolation modules (6); the switch isolation module (6) can detect the power supply status of multiple loads, and the multiple switch isolation modules (6) are connected to the control module (4) through the relay switch acquisition module (7); The analog signal processing module (3) includes a sampling resistor, a current detection chip, a voltage reference circuit, a voltage divider resistor, a four-to-one switching switch, a four-to-one analog switch, and an optocoupler isolation controller. The sampling resistor is connected to an external power supply, and the current detection chip is used to convert the current signal flowing through the sampling resistor into a voltage signal. The current detection chip can output two battery signals. The two battery signals are converted into sampling voltages by a voltage divider resistor. The voltage reference circuit can output a reference voltage signal to the current detection chip. The voltage signal, the two sampling voltages and the reference voltage signal are respectively input to the four-to-one analog switch. The optocoupler isolation controller is used to control the output of the four-to-one analog switch. The output terminal of the four-to-one analog switch, the voltage signal and the two sampling voltages are input to the four-to-one switching switch. The output terminal of the four-to-one switching switch is connected to the control module (4). The switch isolation module (6) includes two P-channel MOS transistors, four N-channel MOS transistors and an optocoupler circuit. The two P-channel MOS transistors are set as positive terminals and connected to the control module (4). The two P-channel MOS transistors are respectively connected to the two N-channel MOS transistors. The four N-channel MOS transistors are set as negative terminals and are respectively connected to the relay switch acquisition module (7) and the corresponding load through the optocoupler circuit.

2. The control circuit for a DC power supply as described in claim 1, characterized in that: The reverse connection protection module (1) consists of a differential amplifier, two parallel ideal diode controllers and a high-current MOSFET. The differential amplifier is connected to an external power supply, the output terminal of the differential amplifier is connected in series with the high-current MOSFET, the high-current MOSFET is connected to both parallel ideal diode controllers, and the two parallel ideal diode controllers are connected to the power supply module (2).

3. The control circuit for a DC power supply as described in claim 1, characterized in that: The power module (2) includes a low-voltage power supply circuit and an isolated power supply circuit. The low-voltage power supply circuit includes a power supply unit M3, a DC-DC conversion control IC and a voltage regulator branch. The power supply unit M3 can convert the 28V voltage input from the external power supply into a 9V voltage output to the data transmission interface module (5). The 9V voltage can be converted into a 3.3V voltage output to the control module (4) through the DC-DC conversion control IC and the voltage regulator branch. The isolated power supply circuit includes a 600W isolated power supply branch and a 30W isolated power supply branch. The 600W isolated power supply branch is composed of a power supply unit M2 and a drive branch connected in series. The power supply unit M2 is used to convert the 28V voltage input from the external power supply into a 12V voltage output to the switch isolation module (6). The 30W isolated power supply branch consists of power supply unit M1 and peripheral circuits. Power supply unit M1 is used to convert the 28V voltage input from the external power supply into a 5V voltage output to the relay switch acquisition module (7).

4. The control circuit for a DC power supply as described in claim 1, characterized in that: The data transmission interface module (5) includes a communication chip and a differential-to-single-ended conversion circuit. The communication chip is used to receive control signals, and the conversion circuit can transmit control signals to the control module (4) in a single-ended manner.

5. The control circuit for a DC power supply as described in claim 1, characterized in that: The control module (4) includes an ADC converter and a processor. The ADC converter is used to receive control signals and can convert analog control signals into digital signals and transmit them to the processor. The processor controls the power supply of each load through the control module (4) according to the digital control signals.

6. The control circuit for a DC power supply as described in claim 1, characterized in that: The relay switch acquisition module (7) includes two relays, an opto-isolation coupler and a MOS transistor. The two relays are connected to multiple switch isolation modules (6) to detect changes in the operation of the switch isolation modules (6). The opto-isolation coupler can amplify the digital signal output by the relay through the MOS transistor and transmit it to the control module (4).

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