CN112688535A - Power-on control system - Google Patents
Power-on control system Download PDFInfo
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- CN112688535A CN112688535A CN202011628536.XA CN202011628536A CN112688535A CN 112688535 A CN112688535 A CN 112688535A CN 202011628536 A CN202011628536 A CN 202011628536A CN 112688535 A CN112688535 A CN 112688535A
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Abstract
The present application relates to a power-on control system. The power-on control system comprises: the power supply, the power-on time sequence control unit and the high-voltage power supply distribution unit; the power-on time sequence control unit is respectively connected with the power supply and the high-voltage power supply distribution unit; the power-on time sequence control unit is used for transmitting the direct current control electricity output by the power supply to the high-voltage power supply distribution unit; the high-voltage power supply distribution unit is initialized according to the direct-current control power; and the power-on sequence control unit is also used for transmitting the grid power output by the power supply to the high-voltage power supply distribution unit under the condition that the high-voltage power supply distribution unit is determined to finish initialization. The power-on control system realizes that the direct-current control power is supplied to the high-voltage power supply distribution unit firstly, the internal control circuit of the high-voltage power supply distribution unit works normally, and the network power output by the power supply is transmitted to the high-voltage power supply distribution unit under the condition that the state initialization of each part in the high-voltage power supply distribution unit is determined, so that the error report caused by the asynchronous state of each part is avoided.
Description
Technical Field
The application relates to the technical field of computed tomography, in particular to a power-on control system.
Background
The high voltage generator is a device for controlling a Computed Tomography (CT) bulb tube to generate X rays, the high voltage generator is mounted at a rotating part of a CT frame, and the Power supply method of a Power Distribution Unit (PDU) of the current high voltage generator generally has the following two modes, one mode is that network Power is controlled and output by a Power supply system of a CT scanning room and is directly supplied to the high voltage generator through a slip ring, and a direct current Power supply required by an internal control circuit of the high voltage generator is obtained by converting the network Power; the other is that the grid power is separated from the control power, and the control power is directly supplied by a switching power supply arranged at the rotating part.
However, the first power supply mode has the problems that if the internal control power supply of the high-voltage generator is abnormal, the whole high-voltage generator is in a downtime state, is disconnected with the main control unit of the CT rotating part, reports various errors and cannot locate the fault reason; the second power supply mode has the problem that reporting errors are caused by asynchronous states among all parts in the high-voltage generator, and certain safety risks exist.
Disclosure of Invention
In view of the above, it is necessary to provide a power-on control system capable of ensuring power supply stability of a power distribution unit of a high voltage generator.
A power-on control system, comprising: the power supply, the power-on time sequence control unit and the high-voltage power supply distribution unit; the power-on time sequence control unit is respectively connected with the power supply and the high-voltage power supply distribution unit;
the power-on sequence control unit transmits the direct current control power output by the power supply to the high-voltage power supply distribution unit;
the high-voltage power supply distribution unit is initialized according to the direct-current control power;
and the power-on sequence control unit transmits the network power output by the power supply to the high-voltage power supply distribution unit under the condition that the high-voltage power supply distribution unit is determined to finish initialization.
In one embodiment, the power-on timing control unit includes: the power tube driving circuit, the network power tube and the direct current power tube;
the power tube driving circuit inputs a first control signal to the direct current power tube;
the direct current power tube is started when a preset time length is reached according to the first control signal, and then the direct current control power is transmitted to the high-voltage power supply distribution unit;
the power tube driving circuit inputs a second control signal to the grid power tube under the condition that the high-voltage power supply distribution unit is determined to finish initialization;
and the grid power tube transmits the grid power to the high-voltage power distribution unit according to the second control signal.
In one embodiment, the power tube driving circuit includes: the direct current control electric drive circuit and the network electric drive circuit; the control end of the direct current control electric drive circuit is connected with the direct current power tube, the input end of the direct current control electric drive circuit is electrically connected with the direct current control of the power supply, and the output end of the direct current control electric drive circuit is connected with the high-voltage power supply distribution unit; the control end of the grid power driving circuit is connected with the grid power tube, the input end of the grid power driving circuit is connected with the grid power of the power supply, and the output end of the grid power driving circuit is connected with the high-voltage power supply distribution unit.
In one embodiment, the dc-controlled electric drive circuit comprises a charging path, an input end of the charging path is electrically connected with the dc control of the power supply, and an output end of the charging path is connected with the high-voltage power supply distribution unit;
and the charging path charges a capacitor connected with the direct current power tube at a preset charging rate so as to enable the direct current power tube to be opened when the preset time length is reached.
In one embodiment, the dc controlled electric drive circuit further comprises a discharge path; the input end of the discharge path is connected with the controller, and the output end of the discharge path is connected with the capacitor;
and the discharge path controls the voltage at two ends of the capacitor to discharge according to the control signal output by the controller so as to close the direct current power tube.
In one embodiment, the grid power driving circuit comprises a grid power switch and an optical coupling thyristor, and the grid power switch is connected with the optical coupling thyristor; the grid power driving circuit is used for controlling the grid power switch to be started, and conducting the grid power tube when the optocoupler thyristor is triggered by zero crossing, so as to control the grid power tube to be started.
In one embodiment, the power-on timing control unit further includes: a grid voltage detection circuit; the grid voltage detection circuit is respectively connected with the input end and the output end of the grid power tube;
the grid voltage detection circuit detects whether the input voltage value and the output voltage value of the grid power tube are within a first preset range, if so, outputs a first state feedback signal to the main control circuit of the CT rack, and if not, outputs a second state feedback signal to the main control circuit of the CT rack; the first state feedback signal is used for representing that the grid power tube works normally, and the second state feedback signal is used for representing that the grid power tube works abnormally.
In one embodiment, the power-on timing control unit further includes: a control voltage detection circuit; the control voltage detection circuit is respectively connected with the input end and the output end of the direct current power tube;
the control electric voltage detection circuit detects whether the input voltage value and the output voltage value of the direct current power tube are within a second preset range, if the input voltage value and the output voltage value of the direct current power tube are both within the second preset range, a third state feedback signal is output to the main control circuit of the CT frame, and if the input voltage value and the output voltage value of the direct current power tube are not within the second preset range, a fourth state feedback signal is output to the main control circuit of the CT frame; the third state feedback signal is used for representing that the direct current power tube works normally, and the fourth state feedback signal is used for representing that the direct current power tube works abnormally.
In one embodiment, the power-on timing control unit further includes: a power tube fault detector; the grid power tube comprises a radiator, the direct current power tube comprises a radiator, and the power tube fault detector is respectively connected with the radiator of the grid power tube and the radiator of the direct current power tube;
the power tube fault detector acquires the temperature of the radiator of the grid power tube and the temperature of the radiator of the direct current power tube, carries out fault detection on the grid power tube according to the temperature of the radiator of the grid power tube, and carries out fault detection on the direct current power tube according to the temperature of the radiator of the direct current power tube.
In one embodiment, the power-on control system further comprises a CT gantry; and the power-on time sequence control unit reports the fault state signal of the grid power tube and the fault state signal of the direct current power tube to a main control circuit of the CT frame.
The power-on control system comprises a power supply, a power-on time sequence control unit and a high-voltage power supply distribution unit, wherein the power-on time sequence control unit is respectively connected with the power supply and the high-voltage power supply distribution unit, the power-on time sequence control unit transmits direct-current control electricity output by the power supply to the high-voltage power supply distribution unit, the high-voltage power supply distribution unit initializes according to the direct-current control electricity transmitted by the power-on time sequence control unit, and the power-on time sequence control unit transmits network electricity output by the power supply to the high-voltage power supply distribution unit under the condition that the power-on time sequence. In the power-on control system, the power-on time sequence control unit is connected between the power supply and the high-voltage power supply distribution unit, so that direct-current control power is supplied to the high-voltage power supply distribution unit firstly, a control circuit in the high-voltage power supply distribution unit works normally, and under the condition that all parts in the high-voltage power supply distribution unit are determined to complete state initialization and be in a controllable state, the power-on time sequence control unit transmits the network power output by the power supply to the high-voltage power supply distribution unit, thereby avoiding error reporting caused by asynchronous states of all parts, and being safer and more reliable.
Drawings
FIG. 1 is a schematic diagram of a power-on control system in one embodiment;
FIG. 2 is a schematic diagram of the power-on control system in one embodiment;
FIG. 3 is a schematic diagram of the power-on control system in one embodiment;
FIG. 4 is a schematic diagram of the power-on control system in one embodiment;
FIG. 5 is a schematic diagram of the power-on control system in one embodiment;
FIG. 5a is a diagram illustrating an exemplary power-on control system
FIG. 6 is a schematic diagram of the power-on control system in one embodiment;
description of reference numerals:
power supply: 10; a power-on sequence control unit: 20; the power tube driving circuit: 201;
grid power tube: 202; a direct current power tube: 203; grid voltage detection circuit: 204;
control electric voltage detection circuit: 205; power tube fault detector: 206;
high-voltage power distribution unit: 30, of a nitrogen-containing gas; a CT frame: 40;
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the present application is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.
At present, a power supply method of a Power Distribution Unit (PDU) of a high voltage generator generally includes two modes, one mode is that a network power is controlled and output by a power system between CT scans and directly supplied to the high voltage generator through a slip ring, and a direct current power supply required by an internal control circuit of the high voltage generator is obtained by converting the network power; the other is that the grid power is separated from the control power, and the control power is directly supplied by a switching power supply arranged at the rotating part. However, the first power supply mode has the problems that if the internal control power supply of the high-voltage generator is abnormal, the whole high-voltage generator is in a downtime state, is disconnected with the main control unit of the CT rotating part, reports various errors and cannot locate the fault reason; the second power supply mode has the problem that reporting errors are caused by asynchronous states among all parts in the high-voltage generator, and certain safety risks exist. The embodiment of the application provides a power-on control system, which can solve the technical problem.
The power-on control system provided by the embodiment of the application can be applied to a Computed Tomography (CT) device, and a high voltage generator of the CT device can include the power-on control system. The following is a detailed description of the devices and the operation principle included in the power-on control system provided in the embodiment of the present application.
In one embodiment, there is provided a power-on control system, as shown in fig. 1, including: a power supply 10, a power-on timing control unit 20, and a high-voltage power distribution unit 30; the power-on sequence control unit 20 is connected to the power supply 10 and the high-voltage power distribution unit 30, respectively; the power-on sequence control unit 20 is configured to transmit the dc control power outputted by the power supply 10 to the high-voltage power distribution unit 30; the high-voltage power distribution unit 30 performs initialization according to the direct-current control power; the power-on sequence control unit 20 is further configured to transmit the grid power output by the power supply 10 to the high-voltage power distribution unit 30 if it is determined that the high-voltage power distribution unit 30 completes initialization.
The initialization of the high voltage power distribution unit 30 according to the dc control power transmitted by the power-on sequence control unit 20 means that the high voltage power distribution unit 30 is normally operated by supplying the dc control power to the high voltage power distribution unit 30.
In an embodiment of the present disclosure, a power-on control system includes: the power supply system comprises a power supply 10, a power-on sequence control unit 20 and a high-voltage power supply distribution unit 30, wherein the power-on sequence unit 20 is respectively connected with the power supply 10 and the high-voltage power supply distribution unit 30. The power-on timing sequence control unit 20 is first configured to transmit the dc control power output by the power supply 10 to the high-voltage power distribution unit 30, where the high-voltage power distribution unit 30 initializes according to the dc control power transmitted by the power-on timing sequence control unit 20, so that the high-voltage power distribution unit 30 works normally, and the power-on timing sequence control unit 20 is further configured to transmit the grid power output by the power supply 10 to the high-voltage power distribution unit when it is determined that the high-voltage power distribution unit 30 completes initialization, that is, works normally.
In the embodiment, the power-on time sequence control unit is connected between the power supply and the high-voltage power supply distribution unit, so that direct-current control power is supplied to the high-voltage power supply distribution unit firstly, the control circuit in the high-voltage power supply distribution unit works normally, and under the condition that all parts in the high-voltage power supply distribution unit are determined to complete state initialization and be in a controllable state, the power-on time sequence control unit transmits the network power output by the power supply to the high-voltage power supply distribution unit, thereby avoiding error reporting caused by asynchronous states of all parts, and being safer and more reliable.
In one embodiment, as shown in fig. 2, the power-on timing control unit 20 includes: a power tube driving circuit 201, a grid power tube 202 and a direct current power tube 203; the power tube driving circuit 201 is used for inputting a first control signal to the direct current power tube 203; the direct current power tube is used for transmitting the direct current control electricity to the high-voltage power supply distribution unit 30 after being started when the preset time length is reached according to the first control signal; the power tube driving circuit 201 is further configured to input a second control signal to the grid power tube 202 when it is determined that the high-voltage power distribution unit 30 completes initialization; and a grid power tube 202 for sending the grid power to the high voltage power distribution unit 30 according to the second control signal.
In the embodiment of the present disclosure, the power-on timing control unit 20 includes: the power tube driving circuit 201 is used for inputting a first control signal to the direct current power tube 203. A dc power tube 203, configured to transmit the dc control power output by the power supply 10 to the high-voltage power distribution unit 30 after being turned on according to the first control signal when a preset time period arrives, so as to initialize the high-voltage power distribution unit 30, and enable a control circuit inside the high-voltage power distribution unit 30 to operate normally; the power tube driving circuit 201 is further configured to, when it is determined that the high-voltage power distribution unit 30 completes initialization, input a second control signal to the grid power tube 202, so that the grid power tube 202 sends the grid power output by the power source 10 to the high-voltage power distribution unit 30 according to the second control signal. Optionally, in the embodiment of the present disclosure, the preset time period may be 60s, or may also be 30s, or may be determined in real time according to the actual working condition of the high-voltage power distribution unit, where the preset time period is not limited in this embodiment. Optionally, the first control signal may be an electrical signal, and the second control signal may also be an electrical signal.
In this embodiment, since the power-on sequence control unit includes the power tube driving circuit, the grid power tube and the dc power tube, the power tube driving circuit can input the first control signal to the dc power tube, so that the dc power is turned on according to the first control signal when the preset time period is reached, and then the dc control electricity output by the power source is transmitted to the high-voltage power distribution unit, so that the power tube driving circuit can input the second control signal to the grid power tube under the condition that the high-voltage power distribution unit completes initialization, so that the grid power tube sends the grid electricity to the high-voltage power distribution unit according to the second control signal, so that the dc control electricity can be transmitted to the high-voltage power distribution unit first, the high-voltage power distribution unit initializes according to the dc control electricity, and then the second control signal is input to the grid power tube under the condition that the high-voltage power distribution unit completes initialization, therefore, the network power output by the power supply is transmitted to the high-voltage power supply distribution unit under the condition that all parts in the high-voltage power supply distribution unit are determined to complete state initialization and be in a controllable state, error reporting caused by asynchronous states of all parts is avoided, and the network power distribution unit is safer and more reliable.
In an embodiment, with continued reference to fig. 2, the power transistor driving circuit 201 includes: the direct current control electric drive circuit and the network electric drive circuit; the control end of the direct current control electric drive circuit is connected with the direct current power tube 203, the input end of the direct current control electric drive circuit is electrically connected with the direct current control of the power supply 10, and the output end of the direct current control electric drive circuit is connected with the high-voltage power supply distribution unit 30; the control end of the grid power driving circuit is connected with the grid power tube 202, the input end of the grid power driving circuit is connected with the grid power of the power supply 10, and the output end of the grid power driving circuit is connected with the high-voltage power supply distribution unit 30.
In the embodiment of the present disclosure, the power transistor driving circuit 201 includes: the direct current control drive circuit and the network power drive circuit.
The control end of the dc control electric driving circuit is connected to the dc power tube 203, the input end of the dc control electric driving circuit is electrically connected to the dc control of the power source 10, and the output end of the dc control electric driving circuit is connected to the high voltage power distribution unit 30. Alternatively, as shown in fig. 3, the dc-controlled electric drive circuit includes a charging path, an input end of the charging path is electrically connected to the dc control of the power supply 10, and an output end of the charging path is connected to the high-voltage power distribution unit 30; the charging path charges a capacitor connected to the dc power tube 203 at a predetermined charging rate, so that the dc power tube 203 is turned on when the predetermined time period is reached. It should be noted here that, as shown in fig. 3, the dc control electric drive circuit uses MOSFET tubes, on one hand, the use of the parallel connection of the two MOSFET tubes increases the current capacity of the current to achieve heat dissipation balance, and on the other hand, the use of the slow start mode for turning on the MOSFET tubes delays the on-time of the MOSFET tubes by adding capacitors between the gate sources of the MOSFET tubes, so that the load current gradually increases, and the impact of the large start current on the switching power supply is reduced. Optionally, with reference to fig. 3, the DC-controlled electric drive circuit further includes a discharge path, an input end of the discharge path is connected to the controller, an output end of the discharge path is connected to the capacitor, the discharge path is configured to control a voltage across the capacitor to discharge according to a control signal output by the controller, so as to turn off the DC power tube 203, that is, as shown in fig. 3, when an IO send enable signal is controlled, Q2 is turned on, Q3 is not turned on, the S1 switch is turned off, the AC-DC input voltage charges C1 through a C1, R1, R3, and Q2 loop, a voltage across C1 rises slowly, and further Q1 is controlled to turn on slowly, when the IO disable is controlled, Q2 is turned off, Q3 is turned on, the S1 switch is turned on, and a voltage across C1 discharges rapidly through R2 and S1, so that Q1 turns off rapidly. It should be noted that, the slow start circuit also causes the problem that the MOSFET is turned off slowly when the MOSFET needs to be turned off, if the MOSFET is turned off when the front end of the MOSFET is normally powered, the turn-off is slow, which causes the resistance between the drain and the source of the MOSFET to increase, the power consumption increases sharply when a large current passes through, and the large current exceeds the thermal endurance capacity of the MOSFET to cause burnout.
The control terminal of the grid power driving circuit is connected to the grid power transistor 202, the input terminal of the grid power driving circuit is connected to the power supply 10, and the output terminal of the grid power driving circuit is connected to the high voltage power supply distribution unit 30. Optionally, as shown in fig. 4, the grid power driving circuit includes a grid power switch and an optocoupler thyristor, where the grid power switch is connected to the optocoupler thyristor; the grid power driving circuit is used for controlling the starting of a grid electric switch, and when the optocoupler thyristor is triggered in a zero-crossing mode, the grid power tube 202 is conducted, and the grid power tube 202 is controlled to be started.
In this embodiment, the power transistor driving circuit includes a dc control electric driving circuit and a grid electric driving circuit, a control terminal of the dc control electric driving circuit is connected to the dc power transistor, an input terminal of the dc control electric driving circuit is electrically connected to the dc control of the power supply, an output terminal of the dc control electric driving circuit is connected to the high voltage power distribution unit, a charging path included in the dc control electric driving circuit can charge a capacitor connected to the dc power transistor with a preset charging power, so that the dc power transistor is turned on when a preset duration arrives, thereby realizing a slow start of the dc power transistor, a discharging path of the dc control electric driving circuit can control voltages at two ends of the capacitor connected to the dc power transistor to discharge according to a control signal output by the controller, so that the dc power transistor can be turned off quickly, thereby solving a problem of slow turn-off of the dc power transistor caused by the dc control electric driving circuit when a load current is large The problem of burning of the power tube; the grid power driving circuit comprises a grid power switch and an optocoupler thyristor, the grid power switch is connected with the optocoupler thyristor, and the power tube is triggered to be conducted only when the grid power passes through zero, so that the impact of the load on the grid power is reduced.
In one embodiment, as shown in fig. 5, the power-on timing control unit 20 further includes: a grid voltage detection circuit 204; the grid voltage detection circuit 204 is respectively connected with the input end and the output end of the grid power tube 202; the grid voltage detection circuit 204 is configured to detect whether an input voltage value and an output voltage value of the grid power tube 202 are within a first preset range, output a first state feedback signal to a main control circuit of the CT gantry if the input voltage value and the output voltage value of the grid power tube 202 are both within the first preset range, and output a second state feedback signal to the main control circuit of the CT gantry if the input voltage value and the output voltage value of the grid power tube 202 are not within the first preset range; the first state feedback signal is used for representing that the grid power transistor 202 works normally, and the second state feedback signal is used for representing that the grid power transistor 202 works abnormally.
In the embodiment of the present disclosure, the power-on timing control unit 20 further includes: a grid voltage detection circuit 204, wherein the grid voltage detection circuit 204 is respectively connected with the input end and the output end of the grid power tube 202; the grid voltage detection circuit 204 is configured to detect whether the input voltage value and the output voltage value of the grid power tube 202 are within a first preset range, output a first state feedback signal for indicating that the grid power tube 202 is working normally to the main control circuit of the CT gantry if the input voltage value and the output voltage value of the grid power tube 202 are both within the first preset range, and output a second state feedback signal for indicating that the grid power tube 202 is working abnormally to the main control circuit of the CT gantry if the input voltage value and the output voltage value of the grid power tube 202 are not within the first preset range. Optionally, the grid voltage detection circuit 204 may detect the grid voltage amplitudes before and after the grid power tube 202, convert the grid current signal into a voltage signal by using a transformer, compare the voltage signal with a threshold of a comparator, implement overvoltage and undervoltage detection of the grid power tube 202, and output a feedback signal representing a working state of the grid power tube.
In this embodiment, the power-on sequence control unit further includes a grid voltage detection circuit, the grid voltage detection circuit is respectively connected to the input terminal and the output terminal of the grid power tube, the grid voltage detection circuit can detect whether the input voltage value and the output voltage value of the grid power tube are within a first preset range, if the input voltage value and the output voltage value of the grid power tube are both within the first preset range, a first state feedback signal indicating that the grid power tube is working normally is output to the main control circuit of the CT gantry, and if the input voltage value and the output voltage value of the grid power tube are not within the first preset range, a second state feedback signal indicating that the grid power tube is working abnormally is output to the main control circuit of the CT gantry, so as to ensure that the input voltage value and the output voltage value of the grid power tube are both within the preset range, and enable the CT gantry to obtain the working state of the grid power tube in time, the stable work of the grid power tube is ensured.
In one embodiment, with continued reference to fig. 5, the power-on timing control unit 20 further includes: a control electric voltage detection circuit 205; the control voltage detection circuit 205 is respectively connected with the input end and the output end of the direct current power tube 203; the control voltage detection circuit 205 is configured to detect whether the input voltage value and the output voltage value of the dc power tube 203 are within a second preset range, output a third state feedback signal to the main control circuit of the CT gantry if the input voltage value and the output voltage value of the dc power tube 203 are both within the second preset range, and output a fourth state feedback signal to the main control circuit of the CT gantry if the input voltage value and the output voltage value of the dc power tube 203 are not within the second preset range; the third state feedback signal is used for representing that the direct current power tube works normally, and the fourth state feedback signal is used for representing that the direct current power tube works abnormally.
In the embodiment of the present disclosure, the power-on timing control unit 20 further includes: a control voltage detection circuit 205, the control voltage detection circuit 205 being connected to an input terminal and an output terminal of the dc power tube 203, respectively; the control voltage detection circuit 205 is configured to detect whether the input voltage value and the output voltage value of the dc power tube 203 are within a second preset range, output a third state feedback signal for indicating that the dc power tube 203 is working normally to the main control circuit of the CT gantry if the input voltage value and the output voltage value of the dc power tube 203 are both within the second preset range, and output a fourth state feedback signal for indicating that the dc power tube 203 is working abnormally to the main control circuit of the CT gantry if the input voltage value and the output voltage value of the dc power tube 203 are not within the second preset range. Optionally, the control voltage detection circuit 205 may sample the control voltage in a voltage division manner, convert the control voltage into a small amplitude voltage, compare the small amplitude voltage with a threshold of the comparator, implement overvoltage and undervoltage detection of the dc power tube 203, and output a feedback signal representing a working state of the dc power tube 203.
In this embodiment, the power-on sequence control unit further includes a control voltage detection circuit, the control voltage detection circuit is respectively connected to the input terminal and the output terminal of the dc power tube, the control voltage detection circuit can detect whether the input voltage value and the output voltage value of the dc power tube are within a second preset range, if the input voltage value and the output voltage value of the dc power tube are both within the second preset range, a third state feedback signal indicating that the dc power tube is working normally is output to the main control circuit of the CT gantry, and if the input voltage value and the output voltage value of the dc power tube are not within the second preset range, a fourth state feedback signal indicating that the dc power tube is working abnormally is output to the main control circuit of the CT gantry, so as to ensure that the input voltage value and the output voltage value of the dc power tube are both within the preset range, the CT frame can also acquire the working state of the direct current power tube in time, and the stable work of the direct current power tube is ensured.
In one embodiment, with continued reference to fig. 5, the power-on timing control unit 20 further includes: a power tube fault detector 206; the grid power tube 202 comprises a radiator, the direct current power tube 203 comprises a radiator, and the power tube fault detector 206 is respectively connected with the radiator of the grid power tube 202 and the radiator of the direct current power tube 203; the power tube fault detector 206 is configured to obtain a temperature of a radiator of the grid power tube 202 and a temperature of a radiator of the dc power tube 203, perform fault detection on the grid power tube 202 according to the temperature of the radiator of the grid power tube 202, and perform fault detection on the dc power tube 203 according to the temperature of the radiator of the dc power tube 203.
In this embodiment, the power-on sequence control unit 20 further includes a power tube fault detector 206, the grid power tube 202 includes a heat sink, the dc power tube 203 includes a heat sink, it should be noted that the failure modes of the grid power tube 202 and the dc power tube 203 are both short-circuit failures, and the short-circuit failures are represented by power tube through-connections, which cannot be detected even if the failures occur, and may cause a safety hazard, but such failure modes have obvious characteristics that the power tubes generate very serious heat and the temperature rises sharply, therefore, in this embodiment, the power tube fault detector 206 is respectively connected to the heat sink of the grid power tube 202 and the heat sink of the dc power tube 203, the power tube fault detector 206 is configured to obtain the temperature of the heat sink of the grid power tube 202 and the temperature of the heat sink of the dc power tube 203, and the grid power tube 202 is fault-detected according to the temperature of the heat sink of the grid power tube 202, the dc power tube 203 is detected for faults according to the temperature of the heat sink of the dc power tube 203, and the implementation principle thereof can be seen in fig. 5 a. Alternatively, the temperature sensor in fig. 5a may be a temperature sensor with a central opening, the temperature sensing end of the temperature sensor is made of metal, and similarly to the manner of using a gasket, a screw is sequentially passed through the hole in the temperature sensor and the fixing hole of the grid power tube 202 or the dc power tube 203 to fix the two on the heat sink of the grid power tube 202 or the heat sink of the dc power tube 203, a temperature sensor is also fixed by a screw at the position of the radiator of the grid power tube 202 or the radiator of the direct current power tube 203 at the equal distance from the grid power tube 202 and the direct current power tube 203, the leads of the three temperature sensors are connected into the temperature detection circuit of the PCB through a connector, the temperature detection circuit detects the temperature values of the three sensors and compares the temperature values with an over-temperature threshold value, when the temperatures of at least two sensors exceed the threshold value, the grid power tube 202 or the direct current power tube 203 is considered to be in fault.
In this embodiment, the power-on sequence control unit further includes a power tube fault detector, the grid power tube includes a heat sink, the dc power tube includes a heat sink, the power tube fault detector is respectively connected with a radiator of the grid power tube and a radiator of the direct current power tube, the power tube fault detector can acquire the temperature of the radiator of the grid power tube and the temperature of the radiator of the direct current power tube, can detect the fault of the grid power tube according to the temperature of the radiator of the grid power tube, the fault detection is carried out on the direct current power tube according to the temperature of the radiator of the direct current power tube, the working states of the grid power tube and the direct current power tube can be monitored, therefore, the fault states of the grid power tube and the direct current power tube can be detected in time, and the working state of the grid power tube and the working state of the direct current power tube can be monitored in time.
In one embodiment, as shown in fig. 6, the power-on control system further includes a CT gantry 40; the power-on sequence control unit 20 is further configured to report a fault state signal of the grid power transistor 202 and a fault state signal of the dc power transistor 203 to a main control circuit of the CT gantry 40.
In this embodiment, the power-on control system further includes a CT gantry 40 connected to the power-on timing control unit 20, and the power-on timing control unit 20 is further configured to report a fault state signal of the grid power transistor 202 and a fault state signal of the dc power transistor 203 to a main control circuit of the CT gantry 40. Optionally, the power-on timing control unit 20 may be wirelessly connected to the CT gantry 40, or may be connected to the CT gantry by wire.
In this embodiment, the power-on control system further includes a CT rack, so that the power-on timing sequence control unit can report the fault state signal of the grid power transistor and the fault state signal of the dc power transistor to the main control circuit of the CT rack, and the main control circuit of the CT rack can timely acquire the fault state signal of the grid power transistor and the fault state signal of the dc power transistor, so that the main control circuit of the CT rack can timely monitor the fault state of the grid power transistor and the fault state of the dc power transistor, and the CT rack can timely locate the fault cause of the high-voltage power distribution unit due to the power supply problem of the power supply.
The technical features of the above embodiments can be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments are not described, however, as long as there is no contradiction between the combinations of the technical features, the scope of the present description should be considered as being described in the present specification.
The above-mentioned embodiments only express several embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, which falls within the scope of protection of the present application. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (10)
1. A power-on control system, comprising: the power supply, the power-on time sequence control unit and the high-voltage power supply distribution unit; the power-on time sequence control unit is respectively connected with the power supply and the high-voltage power supply distribution unit;
the power-on sequence control unit transmits the direct current control power output by the power supply to the high-voltage power supply distribution unit;
the high-voltage power supply distribution unit is initialized according to the direct-current control power;
and the power-on sequence control unit transmits the network power output by the power supply to the high-voltage power supply distribution unit under the condition that the high-voltage power supply distribution unit is determined to finish initialization.
2. The power-on control system according to claim 1, wherein the power-on timing control unit includes: the power tube driving circuit, the network power tube and the direct current power tube;
the power tube driving circuit inputs a first control signal to the direct current power tube;
the direct current power tube is started when a preset time length is reached according to the first control signal, and then the direct current control power is transmitted to the high-voltage power supply distribution unit;
the power tube driving circuit inputs a second control signal to the grid power tube under the condition that the high-voltage power supply distribution unit is determined to finish initialization;
and the grid power tube transmits the grid power to the high-voltage power distribution unit according to the second control signal.
3. The power-on control system of claim 2, wherein the power tube drive circuit comprises: the direct current control electric drive circuit and the network electric drive circuit; the control end of the direct current control electric drive circuit is connected with the direct current power tube, the input end of the direct current control electric drive circuit is electrically connected with the direct current control of the power supply, and the output end of the direct current control electric drive circuit is connected with the high-voltage power supply distribution unit; the control end of the grid power driving circuit is connected with the grid power tube, the input end of the grid power driving circuit is connected with the grid power of the power supply, and the output end of the grid power driving circuit is connected with the high-voltage power supply distribution unit.
4. The power-on control system according to claim 3, wherein the DC-controlled electric drive circuit includes a charging path having an input electrically connected to the DC control of the power source and an output connected to the high-voltage power distribution unit;
and the charging path charges a capacitor connected with the direct current power tube at a preset charging rate so as to enable the direct current power tube to be opened when the preset time length is reached.
5. The power-on control system according to claim 4, wherein the DC-controlled electric drive circuit further comprises a discharge path; the input end of the discharge path is connected with the controller, and the output end of the discharge path is connected with the capacitor;
and the discharge path controls the voltage at two ends of the capacitor to discharge according to the control signal output by the controller so as to close the direct current power tube.
6. The power-on control system according to claim 3, wherein the grid power drive circuit comprises a grid power switch and an optocoupler thyristor, the grid power switch and the optocoupler thyristor being connected; the grid power driving circuit is used for controlling the grid power switch to be started, and conducting the grid power tube when the optocoupler thyristor is triggered by zero crossing, so as to control the grid power tube to be started.
7. The power-on control system according to claim 2, wherein the power-on timing control unit further includes: a grid voltage detection circuit; the grid voltage detection circuit is respectively connected with the input end and the output end of the grid power tube;
the grid voltage detection circuit detects whether the input voltage value and the output voltage value of the grid power tube are within a first preset range, if so, outputs a first state feedback signal to the main control circuit of the CT rack, and if not, outputs a second state feedback signal to the main control circuit of the CT rack; the first state feedback signal is used for representing that the grid power tube works normally, and the second state feedback signal is used for representing that the grid power tube works abnormally.
8. The power-on control system according to claim 2, wherein the power-on timing control unit further includes: a control voltage detection circuit; the control voltage detection circuit is respectively connected with the input end and the output end of the direct current power tube;
the control electric voltage detection circuit detects whether the input voltage value and the output voltage value of the direct current power tube are within a second preset range, if the input voltage value and the output voltage value of the direct current power tube are both within the second preset range, a third state feedback signal is output to the main control circuit of the CT frame, and if the input voltage value and the output voltage value of the direct current power tube are not within the second preset range, a fourth state feedback signal is output to the main control circuit of the CT frame; the third state feedback signal is used for representing that the direct current power tube works normally, and the fourth state feedback signal is used for representing that the direct current power tube works abnormally.
9. The power-on control system according to claim 2, wherein the power-on timing control unit further includes: a power tube fault detector; the grid power tube comprises a radiator, the direct current power tube comprises a radiator, and the power tube fault detector is respectively connected with the radiator of the grid power tube and the radiator of the direct current power tube;
the power tube fault detector acquires the temperature of the radiator of the grid power tube and the temperature of the radiator of the direct current power tube, carries out fault detection on the grid power tube according to the temperature of the radiator of the grid power tube, and carries out fault detection on the direct current power tube according to the temperature of the radiator of the direct current power tube.
10. The power-on control system according to claim 9, further comprising a CT gantry; and the power-on time sequence control unit reports the fault state signal of the grid power tube and the fault state signal of the direct current power tube to a main control circuit of the CT frame.
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| CN112688535B (en) | 2022-07-05 |
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