Standby power supply rapid on-off intelligent solid power controller and rapid on-off method thereof

Abstract

The invention discloses an intelligent solid power controller for quick on-off of a standby power supply and a quick on-off method thereof, the solid power controller controls on-off between the standby power supply and load equipment, and the solid power controller comprises a processor and a power conversion unit, the processor and the power supply conversion unit are respectively connected with the external signal acquisition unit, the communication unit, the MOS driving acquisition unit, the ferroelectric storage unit, the voltage acquisition unit and the state indication unit; and the product has the functions of self-checking, power failure storage, state indication and the like. An external voltage value and a loop current value can be acquired in real time, a working state can be reported in real time through CAN communication, and external two-path power supply voltage thresholds and response time can be configured through CAN communication. The load equipment can be timely connected to enable the external equipment to work normally under the condition that the power supply of the external equipment goes wrong, and the stability of the external equipment is improved.

Description

TECHNICAL FIELD

[0001] The application relates to a quick on-off intelligent solid power controller of a backup power supply and a quick on-off method thereof. BACKGROUND

[0002] Many devices are damaged due to power supply oscillation caused by external environment and other factors in actual use. In order to solve the problem, many precision devices usually use dual power supply, one for normal use and the other for backup. However, the existing dual power supply switching only detects the voltage of the power supply, and the switching process is not timely, so the compensation effect cannot be achieved. For example, the device and method for controlling the main power supply and backup power supply switch disclosed in WO2009059516A1 provide the backup power supply to the load through the control of the MOS switch when the main circuit power supply is overvoltage and undervoltage. However, the problem that the power supply switching is not timely due to the power supply oscillation of the load for a long time cannot be solved. SUMMARY

[0003] The application aims at the problem that the existing backup power supply switching device has slow switching speed and cannot detect the power supply process, and provides an intelligent solid power controller which can quickly on-off the backup power supply.

[0004] The technical scheme of the application is as follows: A quick on-off intelligent solid power controller of a backup power supply, which controls the on-off between the backup power supply and a load device. The solid power controller comprises a processor and a power conversion unit, the processor and the power conversion unit are respectively connected with an external signal acquisition unit, a communication unit, a MOS drive acquisition unit, a ferroelectric storage unit, a voltage acquisition unit and a state indication unit, the external signal acquisition unit acquires high / on signals and ground / on signals of an external power supply, the voltage acquisition unit acquires a control voltage signal, the processor receives the high / on signals, the ground / on signals and the control voltage signal, judges the external power supply through a threshold value set in the processor, and outputs a control signal to the MOS drive acquisition unit to drive the MOS switch to control the on-off of the line between the backup power supply and the load device, the ferroelectric storage unit stores the on-off state information, the state indication unit displays the working state of the solid power controller, and the communication unit is connected with an upper computer. The control voltage signal is transmitted to the processor through an AD acquisition chip and SPI communication, and the control voltage signal comprises two 0-32V voltage signals and two 0-5V voltage signals.

[0005] The power conversion unit converts the 28V voltage into the voltage required by the devices in the intelligent solid power controller for power supply.

[0006] The state indication unit comprises a high / on signal state indication lamp, a low / on signal state indication lamp and a pass state indication lamp.

[0007] A quick on-off method of a standby power supply quick on-off intelligent solid power controller, comprising the following steps: (1) A voltage acquisition unit and an external signal acquisition unit continuously acquire control voltage signal values and high / on signal values and low / on signal voltage values, respectively; (2) A processor receives control voltage signal values through SPI communication, compares corresponding threshold values, and receives and compares high / on signal values, low / on signal voltage values and corresponding times with corresponding threshold values; (3) When the external high / on signal voltage value meets the condition within a set time, the MOS drive acquisition unit drives the MOS switch to connect the load, and the high / on signal state indication lamp is turned on; when the processor judges that the high / on voltage returns to normal, the MOS switch is turned off after 3 seconds; (4) When the external low / on signal voltage value meets the condition within a set time, the MOS switch is connected, and the low / on signal state indication lamp is turned on; when the processor judges that the low / on voltage returns to normal, the MOS switch is turned off after 3 seconds.

[0008] (5) The MOS drive acquisition unit acquires the on-off state of the MOS switch in real time and transmits it to the processor, and the processor records the on-off times and time of the MOS switch through the ferroelectric storage unit; (6) The processor acquires the power supply current and working time of the standby power supply in real time.

[0009] If the MOS switch is connected 5-8 times within one minute, the MOS switch is continuously connected for one minute, and the state indication lamp flashes to display; during this process, the MOS switch is not turned off regardless of whether the external high / on signal and low / on signal are normal or not; If the MOS switch is connected 5-8 times within one minute twice in succession, the MOS switch is continuously connected until the standby power supply is powered off, and the pass state indication lamp flashes during this process.

[0010] The processor also records the working time and cumulative working time of the standby power supply each time, and records the corresponding time when the MOS switch is connected, and stores the trigger reason and corresponding time of the MOS switch connection through the SPI bus into the ferroelectric storage unit; The processor performs self-checking when the standby power supply is powered on, and detects whether the external power supply is disconnected; if the external power supply is not disconnected, the power-on self-checking fails; If the circuit is disconnected, the MOS switch will be turned on. If the MOS switch is successfully turned on, the self-test is considered successful. Otherwise, the power-on self-test fails. At the same time, the trigger reason and corresponding time when the MOS switch is turned on will be stored in the ferroelectric storage unit via the SPI bus.

[0011] When the processor receives a query command from the host computer, it sends the operating status of the backup power supply to the host computer via the CAN bus. When the processor receives the memory query information, it receives the 10 most recent storage information in the ferroelectric storage cell via the SPI bus and sends it to the host computer via the CAN bus. When the processor receives an erase memory information command, it erases all stored data in the ferroelectric storage cell via the SPI bus and sends a clear success command to the host computer via the CAN bus.

[0012] The beneficial effects of this invention are: The product features self-testing, power-off storage, and status indication functions. It can collect external voltage and loop current values ​​in real time and report its operating status via CAN communication. It can also configure the external dual-supply voltage thresholds and response times via CAN communication. This ensures timely connection of the load device to restore normal operation in the event of power supply problems, thus improving the stability of the external device. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of a solid-state power controller.

[0014] Figure 2 This is a schematic diagram of the power conversion unit.

[0015] Figure 3 This is a schematic diagram of the external signal acquisition unit.

[0016] Figure 4 This is a schematic diagram of the processor principle.

[0017] Figure 5 This is a schematic diagram of the communication unit principle.

[0018] Figure 6 This is a schematic diagram of the voltage acquisition unit.

[0019] Figure 7 This is a schematic diagram of the MOS driver acquisition unit.

[0020] Figure 8 This is a schematic diagram of the ferroelectric storage unit.

[0021] Figure 9 This is a schematic diagram of the status indicator unit. Detailed Implementation

[0022] This invention discloses a fast-connection and shutdown intelligent solid-state power controller. By identifying the voltage values ​​of two external high / on and ground / on signals, it can determine whether the voltage value is abnormal within microseconds, thereby quickly controlling the connection and shutdown of a load device with a rated current of 100A and a backup power supply. It has functions such as CAN communication, power-on self-test, command self-test, status indication, and power-off storage of load switching status information. It can feed back information such as the various working states, working time, voltage and current values ​​of the power circuit to external devices via the CAN bus. The voltage judgment threshold of the two external signals and the response time of MOS switch connection and shutdown can be configured via CAN bus commands.

[0023] It includes a power conversion unit, two external signal acquisition units, a signal processor, a communication unit, a voltage acquisition unit, a MOS drive acquisition unit, a ferroelectric storage unit, and a status indication unit.

[0024] The power conversion unit includes various voltage conversion chips that can convert the externally supplied 28V voltage into the various voltage values ​​required by other parts. Its principle block diagram is attached. Figure 1 As shown.

[0025] Two external signal acquisition units acquire external high / open and ground / open signals respectively. After resistor voltage division protection, the two signals are acquired by two AD acquisition chips and fed back to the processor for data processing. When the ground / open signal input terminal is floating, the voltage transmitted to the processor is high; otherwise, the input voltage value transmitted to the processor is the corresponding voltage value. When the high / open signal input terminal is floating, the voltage transmitted to the processor is low; otherwise, the input voltage value transmitted to the processor is the corresponding voltage value. The status of the external signal can be effectively identified through resistor voltage division. Its principle block diagram is attached. Figure 2 As shown.

[0026] The signal processor performs the following processing (its principle block diagram is attached). Figure 3 (as shown) The system acquires six external voltage values, high / on signal voltage values, low / on signal voltage values, and communicates with the EEPROM via the SPI bus. The processor can receive external device configuration information including: high / on signal voltage threshold, low / on signal voltage threshold, high / on signal control MOS switch response time (µs), and low / on signal control MOS switch response time (µs). The system determines the external high / on signal voltage value. When the voltage meets the condition within a set time, it controls the MOS switch to turn on and simultaneously controls the high / on signal status indicator light to illuminate. When the voltage returns to normal, the MOS switch is turned off after 3 seconds. The system determines the external low / on signal voltage value. When the voltage meets the condition within a set time, it controls the MOS switch to turn on and simultaneously controls the low / on signal status indicator to light up. When the voltage returns to normal, the MOS switch is turned off after 3 seconds. Record the number of times the load is turned on and the time. After the MOS switch is turned on 5 times in one minute, the MOS switch is turned on for one minute while the on status indicator flashes. During this process, the MOS switch is not turned off regardless of whether the external high / on signal and low / on signal are normal. Record the number of times the load is turned on. After the MOS switch is turned on 5 times within one minute for the second time, keep the MOS switch on until the product is powered off. During this process, the on status indicator light will flash. Real-time acquisition and processing of load circuit current values ​​and product operating status; Record the working time and cumulative working time of the product each time, and save the time in the memory. At the same time, record the corresponding time when the MOS switch is turned on, and store the triggering reason and corresponding time when the MOS switch is turned on into the EEPROM of the ferroelectric storage unit through the SPI bus. When the product is powered on, it receives a power-on self-test signal and controls the external device to disconnect the low / on signal. It then determines whether the low / on signal is disconnected. If it is not disconnected, the power-on self-test fails. If it is disconnected, the MOS switch is turned on. If the MOS switch is successfully turned on, the power-on self-test is successful. Otherwise, the power-on self-test fails. At the same time, the trigger reason (power-on self-test) when the MOS switch is turned on and the corresponding time are stored in the EEPROM of the ferroelectric storage unit via the SPI bus. When the product receives a command self-test signal during operation, it controls the external device to disconnect the low / on signal and determines whether the low / on signal is disconnected. If it is not disconnected, the command self-test fails. If it is disconnected, the MOS switch is turned on. If it is successfully turned on, the command self-test is successful. Otherwise, the command self-test fails. At the same time, the trigger reason (command self-test) when the MOS switch is turned on and the corresponding time are stored in the EEPROM of the ferroelectric storage unit through the SPI bus. When the processor receives a query command, it sends the product's operating status to the external device via the CAN bus. When it receives a query memory information, the processor receives the 10 most recent storage information in the EEPROM of the ferroelectric storage unit via the SPI bus and sends it to the external device via the CAN bus. When it receives an erase memory information command, the processor erases all stored data in the EEPROM of the ferroelectric storage unit via the SPI bus and sends a clear success command to the external device via the CAN bus.

[0027] The communication unit includes a CAN chip, which connects to the processor. The communication unit is used by external devices to query the various states and configuration information of the intelligent solid-state power controller, as well as the information stored in the EEPROM of the ferroelectric storage unit. External devices also send configuration commands and commands to erase the EEPROM storage information of the ferroelectric storage unit to the product. Its principle block diagram is attached. Figure 4 As shown.

[0028] The voltage acquisition unit includes two 0-32V voltage acquisition channels, two 0-5V voltage acquisition channels, an external power supply voltage acquisition channel, and a current acquisition channel. The two 0-32V voltage channels, two 0-5V voltage channels, and the external power supply voltage are connected to a multi-channel AD acquisition chip after being protected by resistor voltage dividers. Current acquisition involves transmitting the voltage value across a sampling resistor connected in series in the power circuit to an isolation operational amplifier chip. The operational amplifier chip then transmits the converted voltage value to the multi-channel AD acquisition chip, which then transmits it to the processor via SPI communication for voltage-to-current conversion. Its principle block diagram is attached. Figure 5 As shown.

[0029] The MOS drive acquisition unit controls the high and low voltage output of the optocoupler through the processor, thereby controlling the drive circuit. The drive circuit controls the gate voltage of the MOS, thus controlling the MOS switch to turn on and off. Simultaneously, the load circuit current value amplifies the voltage across the sampling resistor through an isolation operational amplifier before being transmitted to the voltage acquisition unit for calculation. Its principle block diagram is attached. Figure 6 As shown.

[0030] The ferroelectric memory cell includes an EEPROM chip, whose communication pins are connected to pins on the processor. It stores load switching state information via SPI communication for easy later tracing. Its block diagram is attached. Figure 7 As shown.

[0031] The status indicator section, connected to an external indicator interface, can visually reflect the operating status of the intelligent solid-state power controller. Its principle block diagram is attached. Figure 8 As shown.

[0032] The ground / on signal voltage threshold is configured to be 3 V, the high / on signal voltage value is 20 V, and the response time is 300 μs via the CAN bus.

[0033] After the product is powered on, when a valid power-on self-test (POST) port signal is detected, the external device power supply is first disconnected. The processor internally determines whether the external power supply is disconnected. If successfully disconnected, the load device is connected within 300 µs. If the load device is successfully connected, the power-on self-test is considered successful, and the reason for the load device connection (power-on self-test) and the time are sent to the EEPROM. Otherwise, the product's power-on self-test fails, and the product needs to be powered off to check the device. After a successful power-on self-test, the product will check the external high / open and ground / open signal voltage values. If either the ground / open signal voltage value is greater than 3 V or the high / open signal voltage value is less than 20 V, it is considered that there is a problem with the external device power supply. The product will control the load device to be connected within 300 µs and store the time and the conditions for connecting the load in the EEPROM. If the product connects five times within one minute, it will remain connected for one minute, and the connection status indicator will flash during one minute. After one minute, the check will be repeated. If the situation of connecting five times within one minute occurs again, the load device will remain connected and the status indicator will flash until the product is powered off. The product's operating status can be intuitively displayed through an external indicator interface. Simultaneously, during product operation, a self-test can be performed at any time via the command self-test interface. Information such as the product's operating status, external signal voltage values, operating time, etc., can be queried via the CAN bus, and information stored in the EEPRON can also be accessed.

[0034] In summary, the fast-start and shut-off intelligent solid-state power controller meets the above-mentioned specific requirements.

[0035] Product Advantages: The product boasts rich functionality, supports configuration of external signal voltage thresholds and response time parameters, and offers high adaptability. It features rapid on / off response time and strong load-bearing capacity. The product has a self-test function to ensure the reliability of the backup power supply. It also features power-off storage for easy tracking of external device operating status. The product has high integration, a compact external structure, and a small size, making it easy to install.

Claims

1. A smart solid-state power controller for rapid switching of backup power, wherein the solid-state power controller controls the switching between the backup power supply and the load device, characterized in that: The solid-state power controller includes a processor and a power conversion unit. The processor and the power conversion unit are respectively connected to an external signal acquisition unit, a communication unit, a MOS drive acquisition unit, a ferroelectric storage unit, a voltage acquisition unit, and a status indication unit. The external signal acquisition unit acquires the high / on signal and the ground / on signal of the external power supply. The voltage acquisition unit acquires control voltage signals; the processor receives high / on signals, ground / on signals, and control voltage signals, and judges the external power supply it is responsible for by passing the threshold set in the processor. After the processor judges, it outputs control signals to the MOS drive acquisition unit to drive the MOS switch to switch the line between the backup power supply and the load device. The ferroelectric storage unit stores the on / off status information it is responsible for. The status indication unit displays the working status of the solid-state power controller. The communication unit is connected to the host computer.

2. The intelligent solid-state power controller for rapid switching of backup power supply according to claim 1, characterized in that: The control voltage signal is transmitted to the processor via SPI communication through the AD acquisition chip. The control voltage signal includes two 0-32V voltage signals and two 0-5V voltage signals.

3. The intelligent solid-state power controller for rapid switching of backup power supply according to claim 1, characterized in that: The power conversion unit converts the 28V voltage to the voltage required by the devices in the intelligent solid-state power controller for power supply.

4. The intelligent solid-state power controller for rapid switching of backup power supply according to claim 1, characterized in that: The status indication unit includes a high / on signal status indicator, a low / on signal status indicator, and an on status indicator.

5. A rapid switching method for a backup power supply intelligent solid-state power controller according to any one of claims 1 to 3, characterized in that: (1) The voltage acquisition unit and the external signal acquisition unit continuously acquire the control voltage signal value, the high / on signal value, and the low / on signal voltage value, respectively; (2) The processor receives the control voltage signal value through SPI communication and compares it with the corresponding threshold. The processor receives the high / on signal value, low / on signal voltage value and corresponding time and compares them with the corresponding threshold. (3) When the external high / open signal voltage value meets the condition within the set time, control the MOS drive acquisition unit to drive the MOS switch to connect the load, and at the same time control the high / open signal status indicator to light up. When the processor judges that the high / open voltage has returned to normal, it turns off the MOS switch after 3 seconds. (4) When the external low / on signal voltage value meets the condition within the set time, the MOS switch is turned on and the low / on signal status indicator light is turned on. When the processor determines that the low / on voltage has returned to normal, the MOS switch is turned off after 3 seconds. (5) The MOS drive acquisition unit acquires the on / off state of the MOS switch in real time and transmits it to the processor. The processor records the number of times the MOS switch is turned on and off and the time through the ferroelectric storage unit. (6) The processor collects the power supply current and working time of the backup power supply in real time.

6. The rapid switching method for the intelligent solid-state power controller for rapid switching of backup power supply according to claim 5, characterized in that: If the MOS switch is turned on 5 to 8 times within one minute, the MOS switch will remain on for one minute, and this will be indicated by the flashing status indicator light. During this process, the MOS switch will not be turned off regardless of whether the external high / on or low / on signals are normal.

7. The rapid switching method for the intelligent solid-state power controller for rapid switching of backup power supply according to claim 6, characterized in that: If the MOS switch is turned on 5 to 8 times within one minute, it will remain on until the backup power supply is cut off. During this process, the on status indicator light will flash.

8. The rapid switching method for the intelligent solid-state power controller for rapid switching of backup power supply according to claim 5, characterized in that: The processor also records the working time of each backup power supply and the cumulative working time, and records the corresponding time when the MOS switch is turned on. It also stores the triggering reason and corresponding time when the MOS switch is turned on into the ferroelectric storage unit through the SPI bus.

9. The rapid switching method for the intelligent solid-state power controller for rapid switching of backup power supply according to claim 5, characterized in that: The processor performs a self-test when the backup power supply is powered on, and checks whether the external power supply is disconnected. If the external power supply is not disconnected, the power-on self-test fails. If the circuit is disconnected, the MOS switch will be turned on. If the MOS switch is successfully turned on, the self-test is considered successful. Otherwise, the power-on self-test fails. At the same time, the trigger reason and corresponding time when the MOS switch is turned on will be stored in the ferroelectric storage unit via the SPI bus.

10. The rapid switching method for the intelligent solid-state power controller for rapid switching of backup power supply according to claim 5, characterized in that: When the processor receives a query command from the host computer, it sends the operating status of the backup power supply to the host computer via the CAN bus. When the processor receives the memory query information, it receives the 10 most recent storage information in the ferroelectric storage cell via the SPI bus and sends it to the host computer via the CAN bus. When the processor receives an erase memory information command, it erases all stored data in the ferroelectric storage cell via the SPI bus and sends a clear success command to the host computer via the CAN bus.

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