DC wide voltage input start-up control circuit and high-speed suspension controller

Abstract

The present application relates to a startup control circuit and a high-speed suspension controller with a DC wide-voltage input, the circuit includes an input end of a power-on current limiting circuit for connecting a DC wide-voltage power supply, and an output end of a power-on current limiting circuit for connecting a system transformer; an input end of a primary control power supply is connected to an output end of a power-on current limiting circuit, and output ends of a primary control power supply and a secondary control power supply are used to connect a load, and an input end of a secondary control power supply is connected to a system transformer. The power-on current limiting circuit is used to provide a power-on current limiting startup control for the system, and the primary control power supply is used to provide a startup control power supply for the system when the power-on current limiting circuit provides a power-on current limiting startup control. The secondary control power supply is used to provide a control power supply for the system when the system is operating normally; the primary control power supply and the secondary control power supply are redundant parallel power supplies for the load, and the output voltage of the secondary control power supply is higher than the output voltage of the primary control power supply. The circuit has low power consumption and high reliability.

Description

Technical Field

[0001] The invention belongs to the technical field of power supply control circuits and relates to a direct current wide voltage input start-up control circuit and a high-speed suspension controller. Background Art

[0002] For switching power supply products with DC wide-range voltage input, its internal control circuit needs to properly control the power supply to meet the actual use needs such as power supply startup control and power supply control. Generally, when designing a small-capacity switching power supply, a capacitor is directly configured at the front end of the switching circuit for filtering, and an NTC (thermistor) resistor is used for current limiting startup at startup. When the system input is a DC wide-range input, this NTC resistor cannot be properly selected and after working for a long time, the temperature of the NTC resistor rises. At this time, if the power is cut off and restarted, the system will not be able to achieve the current limiting startup effect. In addition, when a small switching power supply control IC is started, the power supply generally adopts a resistor direct series connection method. In order to ensure that the control IC starts normally, the current limiting value is generally controlled to the milliampere value. However, when the input voltage is high, the resistor consumes high power. For example, assuming that when the system is DC650V input, the startup circuit limits the current to 1mA, then the power consumption on this resistor is 0.65W, which affects the performance of the system startup control. Therefore, in the process of realizing the present invention, the inventor found that there is still a technical problem of low reliability in the traditional power startup control technology. Summary of the invention

[0003] In view of the problems existing in the above-mentioned traditional methods, the present invention proposes a low-power and high-reliability DC wide-voltage input startup control circuit and a high-speed suspension controller.

[0004] In order to achieve the above objectives, the embodiments of the present invention adopt the following technical solutions:

[0005] On the one hand, a startup control circuit with a DC wide voltage input is provided, comprising a power-on current limiting circuit, a primary control power supply and a secondary control power supply, wherein the input end of the power-on current limiting circuit is used to connect to the DC wide voltage power supply, the output end of the power-on current limiting circuit is used to connect to the primary winding of a system transformer, the control input end of the power-on current limiting circuit is used to connect to the first secondary winding of the system transformer, the input end of the primary control power supply is connected to the output end of the power-on current limiting circuit, the output end of the primary control power supply is used to connect to a load, the input end of the secondary control power supply is connected to the second secondary winding of the system transformer, and the output end of the secondary control power supply is connected to connect to the load;

[0006] The power-on current limiting circuit is used to provide power-on current limiting startup control for the system and provide a pulse power supply through the first secondary winding connected to the control input terminal after the system is working normally. The primary control power supply is used to provide startup control power supply for the system when the power-on current limiting circuit provides power-on current limiting startup control;

[0007] The secondary control power supply is used to provide control power to the system and shut down the primary control power supply when the primary control power supply starts the system until it works normally; the primary control power supply and the secondary control power supply are redundant parallel power supplies for the load, and the output voltage of the secondary control power supply is higher than the output voltage of the primary control power supply.

[0008] In one of the embodiments, the power-on current limiting circuit includes an input connector, a power-on current limiting unit and a low-resistance bypass unit;

[0009] The input connector is used to connect a DC wide-voltage power supply, the input end of the power-on current limiting unit is connected to the input connector, the output end of the power-on current limiting unit is used to connect the primary winding of the system transformer, the input end of the low-resistance bypass unit is connected to the input connector, the control input end of the low-resistance bypass unit is used to connect the first secondary winding of the system transformer, and the output end of the low-resistance bypass unit is connected to the output end of the power-on current limiting unit.

[0010] In one embodiment, the input connector includes a positive connector VIN+ and a negative connector VIN-, the power-on current limiting startup unit includes a current limiting resistor RA1 and a unidirectional conducting diode DA1, and the low-resistance bypass unit includes a low-resistance bypass switch QG1, a current limiting resistor RG1, a rectifier diode DA2, a filter inductor LA1 and a filter capacitor CG1, a freewheeling diode DA3, a voltage regulator diode ZD1 and a capacitor C1;

[0011] The positive connector VIN+ is used to connect the positive end of the DC wide voltage power supply, one end of the current limiting resistor RA1 is connected to the positive connector VIN+, the other end of the current limiting resistor RA1 is connected to the positive electrode of the unidirectional conducting diode DA1, and the negative electrode of the unidirectional conducting diode DA1 is used to connect one end of the primary winding of the system transformer;

[0012] The negative connector VIN- is used to connect the negative end of the DC wide voltage power supply and the other end of the primary winding of the system transformer respectively. One end of the capacitor C1 is connected to the negative electrode of the unidirectional conducting diode DA1, and the other end of the capacitor C1 is connected to the negative connector VIN-;

[0013] The input end of the low-resistance bypass switch QG1 is connected to the positive connector VIN+, the output end of the low-resistance bypass switch QG1 is connected to the cathode of the unidirectional conducting diode DA1 and is used to connect to one end of the first secondary winding of the system transformer, the control end of the low-resistance bypass switch QG1 is connected to one end of the current limiting resistor RG1, the other end of the current limiting resistor RG1 is respectively connected to the other end of the filter inductor LA1, one end of the filter capacitor CG1 and the cathode of the voltage-stabilizing diode ZD1, one end of the filter inductor LA1 is respectively connected to the cathode of the rectifier diode DA2 and the cathode of the freewheeling diode DA3, the other end of the filter capacitor CG1 is respectively connected to the output end of the low-resistance bypass switch QG1, the cathode of the voltage-stabilizing diode ZD1 and the cathode of the freewheeling diode DA3, and the cathode of the rectifier diode DA2 is used to connect to the other end of the first secondary winding of the system transformer.

[0014] In one embodiment, the primary control power supply includes an input voltage filter unit, a flyback power supply unit, an output voltage feedback loop, a low-pass filter unit and a unidirectional conducting diode D5;

[0015] The input end of the input voltage filter unit is connected to the output end of the power-on current limiting circuit, the output end of the input voltage filter unit is connected to the control end of the flyback power supply unit, the ground end of the input voltage filter unit is grounded, the output end of the flyback power supply unit is connected to the input end of the low-pass filter unit, and the feedback input end of the flyback power supply unit is connected to the output end of the output voltage feedback loop;

[0016] The positive electrode of the unidirectional conducting diode D5 is respectively connected to the input end of the output voltage feedback loop and the output end of the low-pass filtering unit, and the negative electrode of the unidirectional conducting diode D5 is used to connect to the load.

[0017] In one embodiment, the input voltage filter unit includes a unidirectional conducting diode DB1 and a polar capacitor EB1, the flyback power supply unit includes a flyback power supply chip U1 and a filter capacitor CB1, the output voltage feedback loop includes a loop resistor RBF1, a loop resistor RBF2, a loop capacitor CB2, a unidirectional conducting diode DB2 and a bypass resistor RB1; the low-pass filter unit includes a filter inductor LB1, a filter capacitor CAP_B1 and a freewheeling diode DB3;

[0018] The positive electrode of the unidirectional conducting diode DB1 is connected to the output end of the power-on current limiting circuit, the negative electrode of the unidirectional conducting diode DB1 is respectively connected to the positive end of the polarity capacitor EB1, the 5th foot and the 8th foot of the flyback power supply chip U1, and the negative end of the polarity capacitor EB1 is grounded;

[0019] Pin 4 of the flyback power chip U1 is connected to one end of the filter capacitor CB1, and the other end of the filter capacitor CB1 is respectively connected to one end of the loop resistor RBF2, one end of the loop capacitor CB2, one end of the filter inductor LB1, the cathode of the flyback diode DB3, and pins 1 and 2 of the flyback power chip U1. The other end of the loop resistor RBF2 is respectively connected to one end of the loop resistor RBF1 and pin 3 of the flyback power chip U1, and the other end of the loop resistor RBF1 is respectively connected to the other end of the loop capacitor CB2 and the cathode of the unidirectional conducting diode DB2;

[0020] The positive electrode of the unidirectional conducting diode DB2 is respectively connected to the positive electrode of the unidirectional conducting diode D5, one end of the bypass resistor RB1, the other end of the filter inductor LB1 and one end of the filter capacitor CAP_B1. The other end of the bypass resistor RB1 is connected to the negative electrode of the unidirectional conducting diode D5. The other end of the filter capacitor CAP_B1 is grounded. The positive electrode of the freewheeling diode DB3 is grounded.

[0021] In one embodiment, the secondary control power supply includes an output rectifier unit, an output filter unit, a unidirectional conducting diode D6 and a voltage regulator diode ZD2;

[0022] The input end of the output rectifier unit is connected to the second secondary winding of the system transformer, the output end of the output rectifier unit is connected to the input end of the output filter unit, the output end of the output filter unit is respectively connected to the positive electrode of the unidirectional conducting diode D6 and the positive electrode of the Zener diode ZD2, the negative electrode of the unidirectional conducting diode D6 is used to connect the load, the negative electrode of the Zener diode ZD2 is connected to the negative electrode of the unidirectional conducting diode D6, and the positive electrode of the Zener diode ZD2 is grounded.

[0023] In one embodiment, the output rectifying unit includes a rectifying diode D3 and a rectifying diode D4, and the output filtering unit includes a filtering inductor LC1 and a filtering capacitor CAP_C1;

[0024] The positive electrode of the rectifier diode D3 is connected to one end of the second secondary winding of the system transformer, the positive electrode of the rectifier diode D4 is connected to the other end of the second secondary winding of the system transformer and is grounded, the negative electrode of the rectifier diode D3 is respectively connected to the negative electrode of the rectifier diode D4 and one end of the filter inductor LC1, the other end of the filter inductor LC1 is respectively connected to one end of the filter capacitor CAP_C1 and the positive electrode of the unidirectional conducting diode D6, and the other end of the filter capacitor CAP_C1 is connected to the positive electrode of the Zener diode ZD2.

[0025] On the other hand, a high-speed suspension controller is also provided, including a switching circuit, a system transformer and the above-mentioned DC wide-voltage input starting control circuit, and the output end of the power-on current limiting circuit of the starting control circuit is connected to the primary winding of the system transformer through the switching circuit.

[0026] In one embodiment, the switch circuit is a double-transistor forward switch circuit.

[0027] In one embodiment, the input end of the start control circuit is used to connect a 260V-660V DC power supply.

[0028] One of the above technical solutions has the following advantages and beneficial effects:

[0029] The above-mentioned DC wide voltage input startup control circuit and high-speed suspension controller adopt the circuit structure of power-on current limiting circuit, primary control power supply and secondary control power supply according to the startup and control power supply requirements of the control power supply itself. The power-on current limiting circuit is used as the startup circuit part to realize current limiting slow start and can provide low resistance bypass to support the secondary winding of the system transformer to provide pulse power after the system is working normally, so as to reliably solve the adverse effects of the system power supply startup impact current. When powered on, the primary control power supply provides a system startup control power supply with an output voltage lower than the output voltage of the secondary control power supply, and after the system is working normally, it switches to the secondary control power supply to provide a control power supply with a higher output voltage. The voltage-graded startup control method avoids the problem of large power consumption of the traditional current limiting startup resistor, thereby achieving the purpose of significantly reducing the system power consumption; in addition, the primary control power supply and the secondary control power supply are redundant parallel power supplies, which can effectively improve the system reliability. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the conventional technology, the drawings required for use in the embodiments or the conventional technology descriptions are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0031] Figure 1 It is a structural schematic diagram of a startup control circuit with DC wide voltage input in one embodiment;

[0032] Figure 2 It is a structural schematic diagram of a startup control circuit with DC wide voltage input in another embodiment;

[0033] Figure 3 It is a structural schematic diagram of a startup control circuit with DC wide voltage input in another embodiment;

[0034] Figure 4 The figure is a simplified schematic diagram of the circuit relationship among a switch circuit, a system transformer and a secondary control power supply in one embodiment. DETAILED DESCRIPTION

[0035] In order to make the purpose, technical solution and advantages of the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0036] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which this application belongs. The terms used herein in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application.

[0037] It should be noted that the reference to "embodiment" in this document means that the specific features, structures or characteristics described in conjunction with the embodiment may be included in at least one embodiment of the present invention. The presentation of the phrase at various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments.

[0038] Those skilled in the art will appreciate that the embodiments described herein may be combined with other embodiments. The term "and / or" used in the present specification and the appended claims refers to any combination of one or more of the associated listed items and all possible combinations, and includes these combinations. The connection between the components of the present application may be a direct electrical connection, or an indirect electrical connection through an intermediate component, or a connection implemented by other transmission lines.

[0039] For the startup of the control power supply itself, the control power supply requirements or other similar working conditions, the corresponding control power supply can be designed to meet the power-on startup and power supply requirements of the internal control circuit.

[0040] The following will describe the implementation of the present invention in detail with reference to the accompanying drawings in the embodiment diagram of the present invention.

[0041] See also Figure 1 In one embodiment, the embodiment of the present application provides a startup control circuit 100 with a DC wide voltage input, including a power-on current limiting circuit 12, a primary control power supply 14, and a secondary control power supply 16. The input end of the power-on current limiting circuit 12 is used to connect to the DC wide voltage power supply, the output end of the power-on current limiting circuit 12 is used to connect to the primary winding of the system transformer T1, and the control input end of the power-on current limiting circuit 12 is used to connect to the first secondary winding of the system transformer T1. The input end of the primary control power supply 14 is connected to the output end of the power-on current limiting circuit 12, and the output end of the primary control power supply 14 is used to connect to a load. The input end of the secondary control power supply 16 is connected to the second secondary winding of the system transformer T1, and the output end of the secondary control power supply 16 is connected to connect to a load.

[0042] The power-on current limiting circuit 12 is used to provide power-on current limiting startup control for the system and provide a pulse power supply through the first secondary winding connected to the control input terminal after the system works normally. The primary control power supply 14 is used to provide startup control power for the system when the power-on current limiting circuit 12 provides power-on current limiting startup control. The secondary control power supply 16 is used to provide control power for the system and turn off the primary control power supply 14 when the primary control power supply 14 starts the system to work normally. The primary control power supply 14 and the secondary control power supply 16 are redundant parallel power supplies for the load. The output voltage of the secondary control power supply 16 is higher than the output voltage of the primary control power supply 14.

[0043] It can be understood that in the present design, the power-on current limiting circuit 12 is a starting circuit that adopts a slow start scheme, which mainly solves the adverse effects of the impact current when the system is powered on and started, and ensures a reliable current limiting starting effect when the system is started and restarted after power failure. The power-on current limiting circuit 12 can be started by designing a current limiting circuit (which can be constructed using a current limiting device), and after the system is running normally, the internal low-resistance bypass is designed to support the pulse power provided by the first secondary winding of the system transformer T1, that is, after the system is running normally, the internal current limiting circuit can stop working, and the parallel low-resistance bypass is responsible for the transmission of the path current, so as to avoid the problem that the temperature of the current limiting circuit increases after a long period of startup and weakens the current limiting starting effect.

[0044] The primary control power supply 14 is used to provide control power when the system is started. When the power-on current limiting circuit 12 provides power-on current limiting start-up control, the primary control power supply 14 will start working when its input voltage reaches a certain voltage level, providing the system with startup control power. When the primary control power supply 14 works normally, the system efficiency can reach 60% to 70% of the normal working efficiency of the system. When the system works normally, the secondary control power supply 16 provides the control power at this time, and the primary control power supply 14 will stop working, thereby achieving the purpose of greatly reducing the power consumption of the system control power supply. The principle is that the primary control power supply 14 and the secondary control power supply 16 are redundant parallel power supplies for the load, that is, the two are redundant parallel outputs. When designed, the output voltage of the primary control power supply 14 is lower than the output voltage of the secondary control power supply 16. The primary control power supply 14 works at startup. After startup, when the system works normally, because the output voltage of the secondary control power supply 16 is higher than the output voltage of the primary control power supply 14, the primary control power supply 14 will automatically stop working, so that the secondary control power supply 16 provides control power after the system works normally.

[0045] When the secondary control power supply 16 fails, its output voltage VCC to the load is reduced, so that the primary control power supply 14 (if it detects that the real-time output voltage of the secondary control power supply 16 is lower than its own designed output voltage) restarts to output control power to the load in the system. In this way, the reliability of the system is effectively improved.

[0046] The load may be, but is not limited to, power-demanding loads such as power control chips, reference voltage chips, overvoltage protection circuits, overcurrent protection circuits, and overtemperature protection circuits. A DC wide-voltage power supply refers to a DC voltage with a wide supply voltage range. In some controller circuit systems, the power-on startup and control power supply requirements of the internal control circuits (including various loads) are relatively flexible and diverse. Therefore, it is necessary to pass the externally provided DC wide-voltage power supply through the startup control circuit for low-power consumption and current-limited startup control and convert it into the control power supply required by the internal control circuit, thereby meeting the power-on startup control and control power supply requirements of the internal control circuit. The system transformer T1 is an existing transformer component in the controller circuit system, which generally includes a primary winding, several secondary windings, and an isolation winding. The specific structure type can be determined from the controller circuit system depending on the actual application.

[0047] The above-mentioned DC wide voltage input start-up control circuit 100, for the start-up and control power supply requirements of the control power supply itself, adopts the circuit structure of the power-on current limiting circuit 12, the first-level control power supply 14 and the second-level control power supply 16, with the power-on current limiting circuit 12 as the start-up circuit part, used to achieve current limiting slow start and provide a low-resistance bypass to support the secondary winding of the system transformer T1 to provide pulse power after the system is working normally, thereby reliably solving the adverse effects of the system power supply startup impact current. When powered on, the first-level control power supply 14 provides a system start-up control power supply with an output voltage lower than the output voltage of the second-level control power supply 16, and after the system is working normally, it switches to the second-level control power supply 16 to provide a control power supply with a higher output voltage, and uses the voltage-grading start-up control method to avoid the problem of large power consumption of the traditional current limiting start-up resistor, thereby achieving the purpose of significantly reducing the power consumption of the system; in addition, the first-level control power supply 14 and the second-level control power supply 16 are redundant parallel power supplies, which can effectively improve the reliability of the system.

[0048] In one embodiment, Figure 2 As shown, the power-on current limiting circuit 12 includes an input connector 122, a power-on current limiting unit 124 and a low-resistance bypass unit 126. The input connector 122 is used to connect to a DC wide voltage power supply, the input end of the power-on current limiting unit 124 is connected to the input connector 122, and the output end of the power-on current limiting unit 124 is used to connect to the primary winding of the system transformer T1. The input end of the low-resistance bypass unit 126 is connected to the input connector 122, the control input end of the low-resistance bypass unit 126 is used to connect to the first secondary winding of the system transformer T1, and the output end of the low-resistance bypass unit 126 is connected to the output end of the power-on current limiting unit 124.

[0049] It can be understood that the power-on current limiting circuit 12 is composed of an input connector 122 for connecting to a DC wide-voltage power supply, a power-on current limiting unit 124 as a power-on current limiting startup circuit, and a low-resistance bypass unit 126 for connecting the first secondary winding of the system transformer T1 to provide a pulse power supply when the system power supply is working normally. The input connector 122 serves as an input port circuit of the startup control circuit 100 from the DC wide-voltage power supply to the DC wide-voltage input, and can adopt an existing circuit connector in the art. The power-on current limiting unit 124 can be constructed using a current limiting device in the art to limit the current of the input DC wide-voltage power supply, so that the system starts working in a slow start manner when it is powered on. The low-resistance bypass unit 126 can be constructed with a thyristor switching device as the main circuit part, so that it can be turned on after the system is working normally and pass through the parallel low-resistance bypass starting circuit. The first secondary winding of the connected system transformer T1 provides a pulse power supply to control the low-resistance bypass unit 126 to turn on and take over the power-on current limiting unit 124 to be responsible for the transmission of the path current, so that the power-on current limiting unit 124 can stop working, avoiding the problems such as the current limiting resistor cannot adapt to the DC wide-range power supply input and the temperature rises after long-term operation affecting the current limiting starting effect.

[0050] In one embodiment, Figure 2 As shown, the primary control power supply 14 includes an input voltage filter unit 142, a flyback power supply unit 144, an output voltage feedback loop 146, a low-pass filter unit 148 and a unidirectional conducting diode D5. The input end of the input voltage filter unit 142 is connected to the output end of the power-on current limiting circuit 12, the output end of the input voltage filter unit 142 is connected to the control end of the flyback power supply unit 144, and the ground end of the input voltage filter unit 142 is grounded. The output end of the flyback power supply unit 144 is connected to the input end of the low-pass filter unit 148, and the feedback input end of the flyback power supply unit 144 is connected to the output end of the output voltage feedback loop 146. The positive pole of the unidirectional conducting diode D5 is respectively connected to the input end of the output voltage feedback loop 146 and the output end of the low-pass filter unit 148, and the negative pole of the unidirectional conducting diode D5 is used to connect the load.

[0051] It can be understood that the input voltage filter unit 142 is used to filter and output the input voltage from the power-on current limiting circuit 12 to control whether the flyback power supply unit 144 starts working. The flyback power supply unit 144 is an output control unit with a flyback power supply as the core, which can provide a startup control power supply for the system after starting up. The output voltage feedback loop 146 is used to feed back the output voltage received at the load to the flyback power supply unit 144, so that the flyback power supply unit 144 determines whether to work according to the output of the secondary control power supply 16. The low-pass filter unit 148 is used to filter and output the output voltage of the flyback power supply unit 144, and safely and reliably provide it to the load through the unidirectional conducting diode D5.

[0052] Specifically, when the system current limiting is started, the input voltage filter unit 142 will simultaneously perform filtering and outputting. When the voltage of the filtered output reaches a certain voltage or above (such as exceeding the starting control voltage of the flyback power supply unit 144), the flyback power supply unit 144 starts working to provide the system with starting control power. When the system starts to work normally, the secondary control power supply 16 provides control power. At this time, the output voltage fed back from the load by the output voltage feedback loop 146 is higher than the output voltage of the flyback power supply unit 144. This will cause the flyback power supply unit 144 to compare the fed back output voltage with its own internal reference voltage, and determine that the fed back output voltage is higher than its own internal reference voltage, so that the flyback power supply unit 144 stops working, so that after the system starts to work normally, the secondary control power supply 16 provides control power, further reducing system power consumption.

[0053] In one embodiment, Figure 2 As shown, the secondary control power supply 16 includes an output rectifier unit 162, an output filter unit 164, a unidirectional conducting diode D6 and a voltage regulator diode ZD2. The input end of the output rectifier unit 162 is connected to the second secondary winding of the system transformer T1, and the output end of the output rectifier unit 162 is connected to the input end of the output filter unit 164. The output end of the output filter unit 164 is respectively connected to the positive electrode of the unidirectional conducting diode D6 and the positive electrode of the voltage regulator diode ZD2. The negative electrode of the unidirectional conducting diode D6 is used to connect the load. The negative electrode of the voltage regulator diode ZD2 is connected to the negative electrode of the unidirectional conducting diode D6, and the positive electrode of the voltage regulator diode ZD2 is grounded.

[0054] It can be understood that the secondary control power supply 16 is mainly composed of an output rectifier unit 162 for connecting to the second secondary winding of the system transformer T1, an output filter unit 164 for filtering the pulse power output provided by the second secondary winding, a unidirectional conducting diode D6 for directional output and preventing backflow, and a voltage regulator diode ZD2 for stabilizing the output voltage. When the system is started to work normally, the pulse power provided by the second secondary winding is filtered by the output filter unit 164 and then output to the load VCC through the unidirectional conducting diode D6 as the current control power supply, and the primary control power supply 14 stops working. When the secondary control power supply 16 is unable to continue to provide control power due to a failure of an internal component, the output VCC voltage is reduced, which can enable the primary control power supply 14 to resume work, output control power, and maintain system operation.

[0055] In one embodiment, Figure 3As shown, the input connector 122 includes a positive connector VIN+ and a negative connector VIN-. The power-on current limiting startup unit includes a current limiting resistor RA1 and a unidirectional conduction diode DA1. The low-resistance bypass unit 126 includes a low-resistance bypass switch QG1, a current limiting resistor RG1, a rectifier diode DA2, a filter inductor LA1 and a filter capacitor CG1, a freewheeling diode DA3, a voltage regulator diode ZD1 and a capacitor C1. The positive connector VIN+ is used to connect the positive end of the DC wide-voltage power supply. One end of the current limiting resistor RA1 is connected to the positive connector VIN+, and the other end of the current limiting resistor RA1 is connected to the positive electrode of the unidirectional conduction diode DA1, and the negative electrode of the unidirectional conduction diode DA1 is used to connect one end of the primary winding of the system transformer T1 (i.e., the system transformer T1-1_2 coil). The negative connector VIN- is used to connect the negative end of the DC wide-voltage power supply and the other end of the primary winding of the system transformer T1. One end of the capacitor C1 is connected to the cathode of the unidirectional conducting diode DA1 , and the other end of the capacitor C1 is connected to the cathode connector VIN-.

[0056] The input end of the low-resistance bypass switch QG1 is connected to the positive connector VIN+, the output end of the low-resistance bypass switch QG1 is connected to the cathode of the unidirectional conducting diode DA1 and is used to connect one end of the first secondary winding of the system transformer T1 (i.e., the system transformer T1-5_6 coil), and the control end of the low-resistance bypass switch QG1 is connected to one end of the current limiting resistor RG1. The other end of the current limiting resistor RG1 is respectively connected to the other end of the filter inductor LA1, one end of the filter capacitor CG1, and the cathode of the voltage-stabilizing diode ZD1. One end of the filter inductor LA1 is respectively connected to the cathode of the rectifier diode DA2 and the cathode of the freewheeling diode DA3. The other end of the filter capacitor CG1 is respectively connected to the output end of the low-resistance bypass switch QG1, the cathode of the voltage-stabilizing diode ZD1, and the cathode of the freewheeling diode DA3. The anode of the rectifier diode DA2 is used to connect the other end of the first secondary winding of the system transformer T1.

[0057] Specifically, in this embodiment, a power-on current limiting circuit 12 of the above-mentioned specific circuit structure is designed, the positive connector VIN+ and the negative connector VIN- are used as the input connector 122 for connecting the DC wide-voltage power supply, the current limiting resistor RA1 and the unidirectional conducting diode DA1 are used as the power-on current limiting startup circuit, which limits the current of the DC wide-voltage power supply connected when the system is powered on and started, so that the system can be powered on and started in a slow start manner. The low-resistance bypass switch QG1 can use a thyristor switch, and the current limiting resistor RG1 can use a thyristor gate current limiting resistor. When the system is operating normally, the system transformer T1-5_6 coil provides a pulse power supply (such as Figure 3As shown in the figure, the output end SCR_K of the low-resistance bypass switch QG1 is used to connect one end SCR_K of the system transformer T1-5_6 coil, and the positive electrode SCR_J of the rectifier diode DA2 is used to connect the other end SCR_J of the system transformer T1-5_6 coil. After being rectified by the rectifier diode DA2 and filtered into DC by the filter inductor LA1 and the filter capacitor CG1, the low-resistance bypass switch QG1 is driven to conduct through the current limiting resistor RG1. At the same time, the freewheeling diode DA3 provides freewheeling and the voltage stabilizing control is provided by the voltage stabilizing diode ZD1. The capacitor C1 makes the power supply output more stable, which can form a power-on current limiting startup. After the system runs normally, the slow startup solution of the low-resistance bypass startup circuit is used to solve the impact current problem when the system is powered on and started.

[0058] In one embodiment, Figure 3 As shown, the input voltage filter unit 142 includes a unidirectional conducting diode DB1 and a polar capacitor EB1. The flyback power supply unit 144 includes a flyback power supply chip U1 and a filter capacitor CB1. The output voltage feedback loop 146 includes a loop resistor RBF1, a loop resistor RBF2, a loop capacitor CB2, a unidirectional conducting diode DB2 and a bypass resistor RB1. The low-pass filter unit 148 includes a filter inductor LB1, a filter capacitor CAP_B1 and a freewheeling diode DB3. The positive electrode of the unidirectional conducting diode DB1 is connected to the output end of the power-on current limiting circuit 12, and the negative electrode of the unidirectional conducting diode DB1 is respectively connected to the positive end of the polar capacitor EB1, the 5th pin (i.e., the HVIN high voltage input pin) and the 8th pin (i.e., the built-in Mos tube drain pin of the DRAIN chip) of the flyback power supply chip U1, and the negative end of the polar capacitor EB1 is grounded. The 6th pin NC of the flyback power supply chip U1 is a non-functional pin and remains suspended.

[0059] Pin 4 (i.e., VDD power supply pin) of the flyback power supply chip U1 is connected to one end of the filter capacitor CB1. The other end of the filter capacitor CB1 is respectively connected to one end of the loop resistor RBF2, one end of the loop capacitor CB2, one end of the filter inductor LB1, the cathode of the freewheeling diode DB3, and pins 1 and 2 (i.e., GND ground pin) of the flyback power supply chip U1. The other end of the loop resistor RBF2 is respectively connected to one end of the loop resistor RBF1 and pin 3 (i.e., FB feedback pin) of the flyback power supply chip U1. The other end of the loop resistor RBF1 is respectively connected to the other end of the loop capacitor CB2 and the cathode of the unidirectional conducting diode DB2.

[0060] The positive electrode of the unidirectional conducting diode DB2 is respectively connected to the positive electrode of the unidirectional conducting diode D5, one end of the bypass resistor RB1, the other end of the filter inductor LB1 and one end of the filter capacitor CAP_B1. The other end of the bypass resistor RB1 is connected to the negative electrode of the unidirectional conducting diode D5. The other end of the filter capacitor CAP_B1 is grounded, and the positive electrode of the freewheeling diode DB3 is grounded.

[0061] Specifically, in this embodiment, a primary control power supply 14 of the above-mentioned specific circuit structure is designed, and the flyback power supply chip U1 integrates an existing flyback power supply chip of a switching device. The loop resistor RBF1, the loop resistor RBF2, the loop capacitor CB2 and the unidirectional conducting diode DB2 constitute the main body of the output voltage feedback loop 146. The bypass resistor RB1 is used to provide an output voltage feedback signal for the flyback power supply chip U1 when the secondary control power supply 16 is working normally, and the flyback power supply chip U1 is input through the main body of the output voltage feedback loop 146. The filter capacitor CB1 is the working power filter capacitor of the flyback power supply chip U1. The filter inductor LB1 and the filter capacitor CAP_B1 constitute a low-pass filter to filter the output of the flyback power supply chip U1, and the freewheeling diode DB3 is for the filter inductor LB1 to freewheel.

[0062] When the system is started with current limiting, the polar capacitor EB1 will be charged through the unidirectional conducting diode DB1 at the same time. When the polar capacitor EB1 is charged to a certain voltage or above, the flyback power supply chip U1 starts to work and provides the system with startup control power. When the system works normally, the secondary control power supply 16 provides control power, and its output voltage is higher than the output voltage of the primary control power supply 14. Feedback compensation is performed through the bypass resistor RB1, and the input feedback voltage of the 3rd pin of the flyback power supply chip U1 will be higher than the internal reference voltage of the chip, so that the flyback power supply chip U1 stops working to further reduce the power consumption of the system. When the secondary control power supply 16 fails, the output VCC voltage decreases, and the feedback voltage signal provided by the bypass resistor RB1 decreases. When the input feedback voltage of the 3rd pin of the flyback power supply chip U1 is lower than the internal reference of the chip, the flyback power supply chip U1 starts to work and outputs the control power, further improving the reliability of the system.

[0063] In one embodiment, Figure 3 As shown, the output rectifier unit 162 includes a rectifier diode D3 and a rectifier diode D4. The output filter unit 164 includes a filter inductor LC1 and a filter capacitor CAP_C1. The positive electrode of the rectifier diode D3 is connected to one end of the second secondary winding of the system transformer T1 (i.e., the system transformer T1-3_4 coil), the positive electrode of the rectifier diode D4 is connected to the other end of the second secondary winding T1 of the system transformer T1 and grounded, the negative electrode of the rectifier diode D3 is respectively connected to the negative electrode of the rectifier diode D4 and one end of the filter inductor LC1, the other end of the filter inductor LC1 is respectively connected to one end of the filter capacitor CAP_C1 and the positive electrode of the unidirectional conducting diode D6, and the other end of the filter capacitor CAP_C1 is connected to the positive electrode of the voltage regulator diode ZD2.

[0064] Specifically, in this embodiment, a secondary control power supply 16 of the above-mentioned specific circuit structure is designed. When the system is working normally, the system transformer T1-3_4 coil provides a pulse power supply, which is rectified by the rectifier diode D3, filtered and output by the output filter circuit composed of the filter inductor LC1 and the filter capacitor CAP_C1, and then output as a control power supply to the load through the unidirectional conduction diode D6.

[0065] Among them, Figure 3 The unselected upper right corner circuit is the dual-tube forward circuit used by the power supply, where the switch tubes Q1 and Q2 are forward switches, the diodes D1 and D2 are freewheeling devices, the system transformer T1-7_10 coil is the secondary output of the isolated main power supply, and CS+ is the current detection output terminal. This part and the secondary control power supply 16 can be simplified as follows Figure 4 As shown, when the forward switch is turned on normally, the power supply voltage (DC440V as shown in the figure) is added to the primary winding of the system transformer T1, and the second secondary winding of the system transformer T1 generates a corresponding output (DC24V as shown in the figure).

[0066] like Figure 4 As shown, in steady state, due to the inductance L1 (i.e. Figure 3 The filter inductor LC1 in the circuit has established a current, which is turned on by the rectifier diode D4 to form a freewheeling circuit for the load. At the beginning of a new cycle, due to the induction electromotive force generated by the conduction of the switch tubes Q1 and Q2 on one side of the primary winding, the secondary winding and the rectifier diode D3 quickly establish a current. Because the current flowing through the inductor L1 remains unchanged at the moment of conduction, the current of the rectifier diode D3 is actually established quickly, and the current of the rectifier diode D4 is also reduced rapidly. When the forward current in the rectifier diode D3 increases to the current value that originally flowed through the rectifier diode D4, the rectifier diode D4 turns off. In addition, the input voltage of the inductor L1 will increase to the secondary winding coil voltage, and at the same time, the energy transfer between the primary and secondary windings begins. In order to prevent the accumulation of residual magnetism, the primary conduction duty cycle is designed to be less than 48%. Figure 4 The capacitor C2 is Figure 3 The filter capacitor CAP_C1 and the inductor L1 form an output filter circuit.

[0067] Through the circuit design of the power-on current limiting circuit 12, the primary control power supply 14 and the secondary control power supply 16, a high-reliability startup control and low power consumption of the system can be achieved with a simple circuit structure.

[0068] In one embodiment, a high-speed suspension controller is provided, comprising a switch circuit, a system transformer T1 and the above-mentioned DC wide voltage input startup control circuit 100. The output end of the power-on current limiting circuit of the startup control circuit 100 is connected to the primary winding of the system transformer T1 through the switch circuit.

[0069] It can be understood that the description and limitation of the DC wide voltage input startup control circuit 100 in this embodiment can be understood in the same way as the corresponding description and limitation in each embodiment of the DC wide voltage input startup control circuit 100, and will not be repeated here. A person skilled in the art can understand that the high-speed suspension controller referred to here includes not only the DC wide voltage input startup control circuit 100, the existing switch circuit and the system transformer T1, but also other structural components, such as but not limited to the power supply control chip and various protection circuits, and can be understood in the same way as the structural composition of various types of high-speed suspension controllers in the art, and will not be described in detail one by one in this specification.

[0070] The high-speed suspension controller can provide reliability of system power startup control and reduce system power consumption by applying the DC wide voltage input startup control circuit 100.

[0071] In one embodiment, the switch circuit is a double-transistor forward switch circuit. The switch circuit adopts a double-transistor forward solution commonly used in the art to better ensure the system operation performance.

[0072] In one embodiment, the input end of the start control circuit is used to connect a 260V-660V DC power supply. Optionally, the start control circuit in this embodiment is connected to a 260V-660V wide range DC power supply, so as to better meet the supply voltage range requirements of the high-speed suspension controller.

[0073] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0074] The above embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and all of them belong to the protection scope of the present application. Therefore, the protection scope of the patent of the present application shall be subject to the attached claims.

Claims

1. A DC wide voltage input startup control circuit, characterized in that: It comprises a power-on current limiting circuit, a primary control power supply and a secondary control power supply, wherein the input end of the power-on current limiting circuit is used to connect to a DC wide-voltage power supply, the output end of the power-on current limiting circuit is used to connect to a primary winding of a system transformer, the control input end of the power-on current limiting circuit is used to connect to a first secondary winding of the system transformer, the input end of the primary control power supply is connected to the output end of the power-on current limiting circuit, the output end of the primary control power supply is used to connect to a load, the input end of the secondary control power supply is connected to a second secondary winding of the system transformer, and the output end of the secondary control power supply is connected to connect to the load; The power-on current limiting circuit is used to provide power-on current limiting startup control for the system and provide a pulse power supply through the first secondary winding connected to the control input terminal after the system works normally, and the primary control power supply is used to provide startup control power supply for the system when the power-on current limiting circuit provides power-on current limiting startup control; The secondary control power supply is used to provide control power to the system and shut down the primary control power supply when the primary control power supply starts the system and works normally; the primary control power supply and the secondary control power supply are redundant parallel power supplies for the load, and the output voltage of the secondary control power supply is higher than the output voltage of the primary control power supply; wherein the power-on current limiting circuit includes an input connector, a power-on current limiting unit and a low-resistance bypass unit; The input connector is used to connect the DC wide-voltage power supply, the input end of the power-on current limiting unit is connected to the input connector, the output end of the power-on current limiting unit is used to connect the primary winding of the system transformer, the input end of the low-resistance bypass unit is connected to the input connector, the control input end of the low-resistance bypass unit is used to connect the first secondary winding of the system transformer, and the output end of the low-resistance bypass unit is connected to the output end of the power-on current limiting unit.

2. The startup control circuit with DC wide voltage input according to claim 1, characterized in that: The input connector includes a positive connector VIN+ and a negative connector VIN-, the power-on current limiting unit includes a current limiting resistor RA1 and a unidirectional conducting diode DA1, and the low-resistance bypass unit includes a low-resistance bypass switch QG1, a current limiting resistor RG1, a rectifier diode DA2, a filter inductor LA1 and a filter capacitor CG1, a freewheeling diode DA3, a voltage regulator diode ZD1 and a capacitor C1; The positive connector VIN+ is used to connect the positive end of the DC wide voltage power supply, one end of the current limiting resistor RA1 is connected to the positive connector VIN+, the other end of the current limiting resistor RA1 is connected to the positive electrode of the unidirectional conducting diode DA1, and the negative electrode of the unidirectional conducting diode DA1 is used to connect one end of the primary winding of the system transformer; The negative electrode connector VIN- is used to connect the negative end of the DC wide voltage power supply and the other end of the primary winding of the system transformer respectively, one end of the capacitor C1 is connected to the negative electrode of the unidirectional conducting diode DA1, and the other end of the capacitor C1 is connected to the negative electrode connector VIN-; The input end of the low-resistance bypass switch QG1 is connected to the positive electrode connector VIN+, the output end of the low-resistance bypass switch QG1 is connected to the cathode of the unidirectional conducting diode DA1 and is used to connect to one end of the first secondary winding of the system transformer, the control end of the low-resistance bypass switch QG1 is connected to one end of the current limiting resistor RG1, the other end of the current limiting resistor RG1 is respectively connected to the other end of the filter inductor LA1, one end of the filter capacitor CG1 and the cathode of the voltage-stabilizing diode ZD1, one end of the filter inductor LA1 is respectively connected to the cathode of the rectifier diode DA2 and the cathode of the freewheeling diode DA3, the other end of the filter capacitor CG1 is respectively connected to the output end of the low-resistance bypass switch QG1, the anode of the voltage-stabilizing diode ZD1 and the anode of the freewheeling diode DA3, and the anode of the rectifier diode DA2 is used to connect to the other end of the first secondary winding of the system transformer.

3. The startup control circuit with DC wide voltage input according to claim 1, characterized in that: The primary control power supply includes an input voltage filter unit, a flyback power supply unit, an output voltage feedback loop, a low-pass filter unit and a unidirectional conducting diode D5; The input end of the input voltage filter unit is connected to the output end of the power-on current limiting circuit, the output end of the input voltage filter unit is connected to the control end of the flyback power supply unit, the ground end of the input voltage filter unit is grounded, the output end of the flyback power supply unit is connected to the input end of the low-pass filter unit, and the feedback input end of the flyback power supply unit is connected to the output end of the output voltage feedback loop; The anode of the unidirectional conducting diode D5 is connected to the input end of the output voltage feedback loop and the output end of the low-pass filtering unit respectively, and the cathode of the unidirectional conducting diode D5 is used to connect to the load.

4. The startup control circuit with DC wide voltage input according to claim 3, characterized in that: The input voltage filter unit includes a unidirectional conducting diode DB1 and a polar capacitor EB1, the flyback power supply unit includes a flyback power supply chip U1 and a filter capacitor CB1, the output voltage feedback loop includes a loop resistor RBF1, a loop resistor RBF2, a loop capacitor CB2, a unidirectional conducting diode DB2 and a bypass resistor RB1; the low-pass filter unit includes a filter inductor LB1, a filter capacitor CAP_B1 and a freewheeling diode DB3; The positive electrode of the unidirectional conducting diode DB1 is connected to the output end of the power-on current limiting circuit, the negative electrode of the unidirectional conducting diode DB1 is respectively connected to the positive end of the polarity capacitor EB1, the 5th pin and the 8th pin of the flyback power supply chip U1, and the negative end of the polarity capacitor EB1 is grounded; Pin 4 of the flyback power supply chip U1 is connected to one end of the filter capacitor CB1, and the other end of the filter capacitor CB1 is respectively connected to one end of the loop resistor RBF2, one end of the loop capacitor CB2, one end of the filter inductor LB1, the cathode of the freewheeling diode DB3, pins 1 and 2 of the flyback power supply chip U1, and the other end of the loop resistor RBF2 is respectively connected to one end of the loop resistor RBF1 and pin 3 of the flyback power supply chip U1, and the other end of the loop resistor RBF1 is respectively connected to the other end of the loop capacitor CB2 and the cathode of the unidirectional conducting diode DB2; The anode of the unidirectional conducting diode DB2 is respectively connected to the anode of the unidirectional conducting diode D5, one end of the bypass resistor RB1, the other end of the filter inductor LB1 and one end of the filter capacitor CAP_B1, the other end of the bypass resistor RB1 is connected to the cathode of the unidirectional conducting diode D5, the other end of the filter capacitor CAP_B1 is grounded, and the anode of the freewheeling diode DB3 is grounded.

5. The startup control circuit with DC wide voltage input according to claim 1, characterized in that: The secondary control power supply includes an output rectifier unit, an output filter unit, a unidirectional conducting diode D6 and a voltage regulator diode ZD2; The input end of the output rectifier unit is connected to the second secondary winding of the system transformer, the output end of the output rectifier unit is connected to the input end of the output filter unit, the output end of the output filter unit is respectively connected to the anode of the unidirectional conducting diode D6 and the anode of the Zener diode ZD2, the cathode of the unidirectional conducting diode D6 is used to connect to the load, the cathode of the Zener diode ZD2 is connected to the cathode of the unidirectional conducting diode D6, and the anode of the Zener diode ZD2 is grounded.

6. The startup control circuit with DC wide voltage input according to claim 5, characterized in that: The output rectifying unit includes a rectifying diode D3 and a rectifying diode D4, and the output filtering unit includes a filtering inductor LC1 and a filtering capacitor CAP_C1; The anode of the rectifier diode D3 is connected to one end of the second secondary winding of the system transformer, the anode of the rectifier diode D4 is connected to the other end of the second secondary winding of the system transformer and is grounded, the cathode of the rectifier diode D3 is respectively connected to the cathode of the rectifier diode D4 and one end of the filter inductor LC1, the other end of the filter inductor LC1 is respectively connected to one end of the filter capacitor CAP_C1 and the anode of the unidirectional conducting diode D6, and the other end of the filter capacitor CAP_C1 is connected to the anode of the voltage regulator diode ZD2.

7. A high-speed suspension controller, characterized in that: It comprises a switching circuit, a system transformer and a startup control circuit with a DC wide voltage input as claimed in any one of claims 1 to 6, wherein the output end of the power-on current limiting circuit of the startup control circuit is connected to the primary winding of the system transformer through the switching circuit.

8. The high-speed suspension controller according to claim 7, characterized in that: The switch circuit is a double-tube forward switch circuit.

9. The high-speed suspension controller according to claim 7 or 8, characterized in that: The input end of the start control circuit is used to connect a 260V-660V DC power supply.

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