Shutdown self-checking control method, shutdown self-checking control circuit and electronic equipment

Abstract

The invention discloses a power-off self-checking control method, a power-off self-checking control circuit and electronic equipment. The power-off self-checking control method comprises the following steps: acquiring self-checking characteristic parameters in a power supply regulating circuit; when the self-checking characteristic parameter is smaller than a first threshold range, acquiring a first output voltage of the power supply adjusting circuit; after the power supply adjusting circuit is driven and subjected to wave sealing for a first duration, a second output voltage of the power supply adjusting circuit is obtained; detecting whether a voltage difference value between the first output voltage and the second output voltage is smaller than a second threshold range or not; if the voltage difference value is not less than the second threshold range, detecting whether the wave sealing cumulative time is greater than the maximum wave sealing time; and if the wave sealing cumulative time is not greater than the maximum wave sealing time, returning to execute the step of obtaining the first output voltage of the power supply adjusting circuit. By means of the mode, the shutdown self-checking control method avoids the danger when the power supply adjusting circuit is shut down, the implementation cost is low, the control mode is more flexible, and the dynamic performance is good.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of circuit control, in particular to a power-off self-checking control method, a power-off self-checking control circuit and an electronic device. BACKGROUND

[0002] Nowadays, with the increasing richness of electronic devices, the performance requirements for the driving power supply of the electronic devices are also increasingly stringent, especially for the driving power supply which is powered by the power grid and has a large load jump range. Since the large load jump has a pulling effect on the power grid, the harmonic content of the input power grid is significantly distorted. In order to reduce the harmonic content of the input power grid, the load carrying capacity of the driving power supply needs to be compensated. However, the power supply device with compensation function usually has an energy storage unit. If the power supply device cannot be reliably powered off, the long-time energy storage discharge will bring certain danger.

[0003] However, the power-off mode in the related art usually adopts an external mechanical switch to control the power-on and power-off of the power supply device. The mechanical switch control is relatively reliable, but it will increase the hardware cost and is not very flexible. SUMMARY

[0004] The technical problem solved by the present application is to provide a power-off self-checking control method, a power-off self-checking control circuit and an electronic device, which can solve the problem of high hardware cost and low flexibility of the power supply device in the related art when powered off by a mechanical signal.

[0005] To solve the above technical problem, one technical solution adopted by the present application is to provide a power-off self-checking control method applied to the power-off self-checking control of a power supply regulating circuit, wherein the power-off self-checking control method comprises: obtaining a self-checking characteristic parameter in the power supply regulating circuit; detecting whether the self-checking characteristic parameter is less than a first threshold range; if the self-checking characteristic parameter is less than the first threshold range, obtaining a first output voltage of the power supply regulating circuit; obtaining a second output voltage of the power supply regulating circuit after driving the power supply regulating circuit to clamp for a first time length; detecting whether a voltage difference between the first output voltage and the second output voltage is less than a second threshold range; if the voltage difference is not less than the second threshold range, detecting whether a clamping cumulative time is greater than a maximum clamping time; if the clamping cumulative time is not greater than the maximum clamping time, returning to execute the step of obtaining the first output voltage of the power supply regulating circuit.

[0006] The power-off self-checking control method comprises: if the self-checking characteristic parameter is not less than the first threshold range, obtaining a power supply characteristic parameter in the power supply regulating circuit; generating a driving control signal by using the power supply characteristic parameter; and sending the driving control signal to the power supply regulating circuit to trigger the power supply regulating circuit to change the switching state.

[0007] The step of acquiring the power supply characteristic parameter in the power supply regulation circuit comprises: acquiring an output voltage and a resonant inductance current in the power supply regulation circuit; and the step of generating the drive control signal by using the power supply characteristic parameter comprises: performing proportional integral adjustment on a first difference between the target reference voltage and the output voltage to obtain a reference current; and performing proportional integral adjustment on a second difference between the reference current and the resonant inductance current to obtain the drive control signal.

[0008] The shutdown self-checking control method comprises: if the voltage difference is less than the second threshold range, the step of acquiring the power supply characteristic parameter in the power supply regulation circuit is performed.

[0009] The shutdown self-checking control method comprises: if the clamping cumulative time is greater than the maximum clamping time, it is detected whether the second output voltage is less than the under-voltage protection threshold range; and if the second output voltage is not less than the under-voltage protection threshold range, the step of acquiring the power supply characteristic parameter in the power supply regulation circuit is performed.

[0010] The shutdown self-checking control method comprises: if the second output voltage is less than the under-voltage protection threshold range, the power supply regulation circuit is driven to clamp.

[0011] The power supply regulation circuit comprises a main-phase voltage conversion circuit and a slave-phase voltage conversion circuit which are connected in parallel with each other, and the clamping of the power supply regulation circuit for the first time length comprises: setting the synchronization output port in the main-phase voltage conversion circuit, so that the slave-phase voltage conversion circuit is synchronized with the main-phase voltage conversion circuit to drive clamping for the first time length.

[0012] The step of acquiring the self-checking characteristic parameter of the power supply regulation circuit comprises: acquiring the self-checking characteristic parameter of the power supply regulation circuit every second time length; the second time length is greater than the maximum clamping time, and the self-checking characteristic parameter comprises one or more of an input current, an output current, an input power and an output power.

[0013] To solve the above technical problems, another technical solution adopted by the present application is to provide a shutdown self-checking control circuit, wherein the shutdown self-checking control circuit is coupled to a power supply regulation circuit; and the shutdown self-checking control circuit uses the shutdown self-checking control method as described in any one of the above to control the shutdown self-checking of the power supply regulation circuit.

[0014] To solve the above technical problems, another technical solution adopted by the present application is to provide an electronic device, wherein the electronic device comprises a housing and a shutdown self-checking control circuit connected to the housing; and the shutdown self-checking control circuit is the shutdown self-checking control circuit as described above.

[0015] The beneficial effects of the present application are: different from the prior art, the power-off self-checking control method provided by the present application acquires the self-checking characteristic parameter of the power regulating circuit, acquires the first output voltage of the power regulating circuit when the self-checking characteristic parameter is less than the first threshold range, acquires the second output voltage of the power regulating circuit after driving the power regulating circuit for the first time length, and continuously maintains the blocking of the power regulating circuit when the voltage difference between the first output voltage and the second output voltage is not less than the second threshold range and the blocking cumulative time is not greater than the maximum blocking time, so as to correspond to the change of the self-checking characteristic parameter in the power regulating circuit shutdown scenario, drive the power regulating circuit in time, rapidly reduce the output voltage of the power regulating circuit, and avoid the danger of internal stored energy when the power regulating circuit is powered off; and without additional power-off hardware switch, the cost is low, and the control mode is more flexible; in addition, it can also effectively avoid the driving blocking when the voltage difference is less than the second threshold range, that is, the power regulating circuit is in light load or idle standby state, so as to avoid affecting the power regulating circuit to respond to load change and adjust the power supply output in time, thereby effectively improving the dynamic response performance of the power regulating circuit. BRIEF DESCRIPTION OF DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed in the embodiment description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0017] Figure 1 is a flowchart of the first embodiment of the power-off self-checking control method of the present application;

[0018] Figure 2 is a structural schematic diagram of the first embodiment of the power-off self-checking control circuit of the present application;

[0019] Figure 3 is a flowchart of the second embodiment of the power-off self-checking control method of the present application;

[0020] Figure 4 is a structural schematic diagram of the second embodiment of the power-off self-checking control circuit of the present application;

[0021] Figure 5 is Figure 3 is a logic framework diagram of an embodiment of the signal processing flow in the power-off self-checking control method;

[0022] Figure 6 is a structural schematic diagram of an embodiment of the electronic device of the present application. DETAILED DESCRIPTION

[0023] The technical solutions in the embodiments of the present application will be clearly and completely described in combination with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work belong to the scope of protection of the present application.

[0024] The terms "first", "second", "third" in the present application are only for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined with "first", "second", "third" can explicitly or implicitly include at least one of the features. In the description of the present application, the meaning of "multiple" is at least two, such as two, three, etc., unless otherwise explicitly specified. All directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present application are only used to explain the relative positional relationship, movement condition, etc. between components in a certain posture (as shown in the drawings), and if the certain posture changes, the directional indications also change accordingly. In addition, the terms "include" and "have" and any variations thereof are intended to cover non-exclusive inclusion. For example, a process, method, system, product or device including a series of steps or units is not limited to the listed steps or units, but can optionally include steps or units not listed, or can optionally include other steps or units inherent to the process, method, product or device.

[0025] In this document, the reference to "embodiment" means that the specific features, structures or characteristics described in connection with the embodiment can be included in at least one embodiment of the present application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it mutually exclusive or alternative to other embodiments. Those skilled in the art explicitly and implicitly understand that the embodiments described herein can be combined with other embodiments.

[0026] The present application will be described in detail below in combination with the drawings and embodiments.

[0027] Please refer to Figure 1 and Figure 2 , wherein, Figure 1 is a flowchart of the first embodiment of the power-off self-check control method of the present application, Figure 2 is a structural schematic diagram of the first embodiment of the power-off self-check control circuit of the present application. Specifically, it can include the following steps:

[0028] S11: Obtain the self-check characteristic parameters in the power supply regulation circuit.

[0029] It can be understood that the power-off self-checking control method in the embodiment is specifically applied to the power-off self-checking control of the first power regulating circuit 30 as shown in the figure. Figure 2 It can be understood that the power-off self-checking control method in the embodiment is specifically applied to the power-off self-checking control of the first power regulating circuit 30 as shown in the figure.

[0030] It is worth noting that the first power regulating circuit 30 can specifically be a single-bridge-arm bidirectional buck-boost circuit, a single-phase BUCK circuit (buck converter), or a BOOST circuit, or any other reasonable circuit topology, and the present embodiment does not limit this.

[0031] In some embodiments, the first power-off self-checking control circuit 20 can specifically include one of any reasonable circuit unit with signal processing function, such as a control chip, a DSP (Digital Signal Processing) chip, an MCU (Micro Controller Unit) circuit, a CPU (Central Processing Unit), a single-chip microcomputer, a field programmable gate array, a programmable logic device, a discrete gate or transistor logic device, and a discrete hardware, and the present application does not limit this.

[0032] In addition, "coupling" in this article refers to any direct and indirect connection means. Therefore, if the first circuit is described as being coupled to the second circuit, it means that the first circuit can be directly connected to the second circuit through electrical connection or wireless transmission, optical transmission, or other signal connection methods, or indirectly connected to the second circuit through other circuits or connection means.

[0033] It can be understood that the power-off self-checking control in this article detects and analyzes the key parameters (such as voltage, current, etc.) before the first power regulating circuit 30 enters the power-off state, and sets any reasonable one or more key parameters as a self-checking characteristic parameter to determine whether to enter the safe power-off program using the self-checking characteristic parameter.

[0034] Specifically, the first power-off self-checking control circuit 20 periodically samples the self-checking characteristic parameter from the first power regulating circuit 30 at a set time interval or in real time.

[0035] In some embodiments, the self-checking characteristic parameter can specifically include one or more of any reasonable circuit parameters such as input current, output current, input power, and output power, and can be obtained by any reasonable sampling method such as a current sensor, a sampling resistor, or a circuit model estimation, and the present application does not limit this.

[0036] S12: detecting whether the self-check characteristic parameter is less than a first threshold range.

[0037] It can be understood that the first threshold range is specifically set according to the change of the self-check characteristic parameter when the first power regulation circuit 30 enters the shutdown state. When the self-check characteristic parameter is a current parameter, the first threshold range is a current threshold range; when the self-check characteristic parameter is a power parameter, the first threshold range is a power threshold range.

[0038] Specifically, the first shutdown self-check control circuit 20 detects whether the currently obtained self-check characteristic parameter is less than the first threshold range, so as to determine whether the first power regulation circuit 30 enters the shutdown state.

[0039] If the self-check characteristic parameter is less than the first threshold range, S13 is performed, and if the self-check characteristic parameter is not less than the first threshold range, S17 is performed.

[0040] S13: obtaining a first output voltage of the power regulation circuit.

[0041] When it is determined that the self-check characteristic parameter is less than the first threshold range, the shutdown control program is entered to record the current output voltage of the first power regulation circuit 30, i.e., the first output voltage, as an initial voltage reference point of the self-check process.

[0042] S14: obtaining a second output voltage of the power regulation circuit after driving the power regulation circuit for a first duration.

[0043] The first power regulation circuit 30 is driven to be blocked, i.e., the driving signal of the internal switching device of the first power regulation circuit 30 is turned off, so that the first power regulation circuit 30 stops working, and the blocking duration is a set first duration (such as several milliseconds to several tens of milliseconds). After that, the second output voltage of the first power regulation circuit 30 after being blocked is obtained again, and the blocking cumulative time is recorded.

[0044] In some embodiments, the first duration can be specifically 5 ms (milliseconds)-20 ms, such as 8 ms (milliseconds), 10 ms, or 12 ms, or any reasonable duration, and is preferably 10 ms, which is not limited in the present application.

[0045] S15: detecting whether a voltage difference between the first output voltage and the second output voltage is less than a second threshold range.

[0046] It is worth noting that in some practical application scenarios, the self-check characteristic parameter of the first power supply regulating circuit 30 after entering the shutdown state may have similar variation characteristics as the standby state of the first power supply regulating circuit 30 in the idle or light load state, that is, the first power supply regulating circuit 30 entering the shutdown state and entering the standby state both satisfy the judgment condition that the self-check characteristic parameter is less than the first threshold range, so further distinction needs to be made.

[0047] It can be understood that when the first power supply regulating circuit 30 enters the standby state, driving the first power supply regulating circuit 30 for the first duration of time generally does not cause significant changes in its output voltage, but driving the first power supply regulating circuit 30 after it enters the shutdown state will cause the output voltage of the first power supply regulating circuit 30 to drop until it drops to a safe range, so a reasonable second threshold range is set according to the output voltage variation characteristics before and after the clamping in the two states to distinguish between the first power supply regulating circuit 30 entering the shutdown state and the standby state.

[0048] Specifically, the first output voltage is subtracted from the second output voltage to calculate the voltage variation amplitude before and after the clamping of the first power supply regulating circuit 30, that is, the voltage difference, to determine whether the voltage difference is less than the second threshold range.

[0049] It is worth noting that the second threshold range can be a positive voltage range, and the voltage difference corresponds to the absolute value of the voltage variation amplitude before and after the clamping of the first power supply regulating circuit 30; the second threshold range can also be a voltage range including positive and negative values, and the voltage difference also corresponds to positive and negative values, which is not limited by the present application.

[0050] If the voltage difference is not less than the second threshold range, S16 is performed, and if the voltage difference is less than the second threshold range, S17 is performed.

[0051] S16: Detect whether the clamping cumulative time is greater than the maximum clamping time.

[0052] It can be understood that a maximum clamping time is set according to the clamping duration corresponding to the reduction of the output voltage of the first power supply regulating circuit 30 entering the shutdown state to a relatively safe voltage range, so as to exclude possible dangers and prevent the system from being unresponsive for a long time and affecting dynamic performance.

[0053] Specifically, when it is determined that the voltage difference is not less than the second threshold range, that is, it is determined that the shutdown state is entered, it is detected whether the currently recorded clamping cumulative time is greater than the maximum clamping time.

[0054] In some embodiments, the maximum blocking time can be specifically 50ms-500ms, such as 50ms (milliseconds), 200ms, or 500ms, or any reasonable time length, and preferably 50ms, that is, when the first time length is 10ms, the cycle ends after driving the blocking detection of the first power regulation circuit 30 for 5 times, which is not limited in the present application.

[0055] If the blocking cumulative time is greater than the maximum blocking time, S17 is performed, and if the blocking cumulative time is not greater than the maximum blocking time, S13 is returned to perform.

[0056] S17: Obtain the power supply characteristic parameter in the power regulation circuit.

[0057] It can be understood that when it is determined that the self-check characteristic parameter is not less than the first threshold range, it actually corresponds to the first power regulation circuit 30 being in a normal working state, and normal blocking of the first power regulation circuit 30 needs to be performed; when it is detected that the voltage difference is less than the second threshold range, it is determined that the first power regulation circuit 30 is in a standby state, and normal blocking of the first power regulation circuit 30 needs to be performed; and when it is detected that the blocking cumulative time of the first power regulation circuit 30 is greater than the maximum blocking time, it is determined that in the shutdown process, the output voltage of the first power regulation circuit 30 has been reduced to a relatively safe voltage range by a long time of driving blocking, at this time, feedback regulation can be used to normally perform blocking, so as to timely and quickly meet the power supply demand when restarting or power supply recovery, so as to ensure the stability of power supply and improve the dynamic performance.

[0058] Specifically, the power supply characteristic parameter of the first power regulation circuit 30 is obtained in real time, such as one or more of any reasonable circuit parameters, such as output current, output voltage, etc., which are not limited in the present application.

[0059] S18: Generate a driving control signal using the power supply characteristic parameter.

[0060] The first shutdown self-check control circuit 20 uses the voltage loop and / or current loop set in the internal controller to adopt a PI (Proportional Integral) regulation algorithm, a PID (Proportional Integral Derivative) regulation algorithm, or other any reasonable feedback regulation algorithm to process the current obtained power supply characteristic parameter to obtain a driving control signal, and dynamically adjust the duty cycle of the driving control signal.

[0061] In some embodiments, the driving control signal can be one or more of a PWM (Pulse Width Modulation) signal, a PFM (Pulse Frequency Modulation) signal, or any reasonable control signal, which is not limited in the present application.

[0062] S19: sending the driving control signal to the power regulation circuit to trigger the power regulation circuit to change the switching state.

[0063] The driving control signal in dynamic adjustment is sent to the first power regulation circuit 30 to trigger the first power regulation circuit 30 to change the switching state in real time, thereby dynamically adjusting the power supply output of the first power regulation circuit 30.

[0064] The above scheme, in response to the change of the self-check characteristic parameter of the first power regulation circuit 30 in the shutdown state, timely drives the first power regulation circuit 30 to the off state, rapidly reduces the output voltage of the first power regulation circuit 30, prevents abnormal energy output, thereby avoiding the danger of internal stored energy when the first power regulation circuit 30 is shut down, and effectively realizing the intelligent and safe automatic shutdown process; without additional shutdown hardware switch, the cost is low, the control method is simple and reliable, easy to realize, more flexible, and the structure design is simpler; in addition, it can effectively avoid the driving off when the voltage difference is less than the second threshold range, that is, the first power regulation circuit 30 is in light load or idle standby state, so as to affect the timely response of the first power regulation circuit 30 to the load change to adjust the power supply output, thereby improving the dynamic response performance.

[0065] Further, in some embodiments, the first power regulation circuit 30 specifically further includes a main phase voltage conversion circuit (not shown in the figure) and a slave phase voltage conversion circuit (not shown in the figure) connected in parallel with each other, and in the above S14, specifically can include: setting the synchronization output port in the main phase voltage conversion circuit to enable the slave phase voltage conversion circuit to be synchronized with the main phase voltage conversion circuit to drive off for the first time length.

[0066] It can be understood that in the first power regulation circuit 30, the voltage conversion circuit has multiple, in order to prevent the output port from still having a high voltage after shutdown, specifically, all voltage conversion circuits need to be synchronously driven off and recovered.

[0067] Specifically, any one of the plurality of voltage conversion circuits is set as a master, that is, a main phase voltage conversion circuit, while the other voltage conversion circuits are set as slaves, that is, slave phase voltage conversion circuits, and the main phase voltage conversion circuit detects whether to drive off and sends a synchronization signal, and the slave phase voltage conversion circuit identifies the synchronization signal to realize the shutdown master-slave control.

[0068] It is worth mentioning that reset refers to clear 0, or can be understood as setting the level on the synchronous output port to low; set refers to set 1, or can be understood as setting the level on the synchronous output port to high. Setting requires a mandatory input, while resetting can be used in a loop program.

[0069] It can be seen that when the main phase voltage conversion circuit identifies that shutdown sealing wave processing is required, the synchronous output port can be set to enable the slave phase voltage conversion circuit to respond to the set signal to drive the sealing wave for the first time length synchronously with the main phase voltage conversion circuit, and when the synchronous output port is reset, it responds to the reset signal to recover the wave synchronously with the main phase voltage conversion circuit, thereby ensuring the consistency of the shutdown of each voltage conversion circuit, and avoiding the problem of communication delay or inconsistent triggering of protection thresholds between voltage conversion circuits.

[0070] Please refer to Figure 3 and Figure 4 , wherein, Figure 3 is a flowchart of the second embodiment of the shutdown self-checking control method of the present application, Figure 4 is a structural schematic diagram of the second embodiment of the shutdown self-checking control circuit of the present application. The shutdown self-checking control method of the present embodiment is a detailed embodiment of the shutdown self-checking control method in Figure 1 , and specifically includes the following steps:

[0071] S41: Obtain the self-checking characteristic parameters of the power supply regulation circuit every second time length.

[0072] It can be understood that the shutdown self-checking control method in the present embodiment can be a second shutdown self-checking control circuit (not shown in the figure) to implement shutdown self-checking control on the second power supply regulation circuit 50 as shown in Figure 4 , to supply power to the load circuit 62 through the power supply bus 61. Wherein, the second power supply regulation circuit 50 includes an energy storage sub-circuit 52 and at least two voltage conversion sub-circuits 51 coupled to each other, the energy storage sub-circuit 52 includes at least two super capacitors Cs connected in parallel to each other, and the voltage conversion sub-circuit 51 includes an upper switch tube Qs, a lower switch tube Qx and an energy storage inductor Lx.

[0073] The first end of each super capacitor Cs is coupled to each other and to the first end of each energy storage inductor Lx, the second end of each super capacitor Cs is coupled to each other and to the second end of each lower switch Qx, and is used to be coupled to the power bus 61, the second end of each energy storage inductor Lx is coupled to the second end of the corresponding upper switch Qs and the third end of the lower switch Qx, and the third end of each upper switch Qs is used to be coupled to the power bus 61; the first end of each upper switch Qs and the first end of each lower switch Qx are coupled to the second shutdown self-checking control circuit, and are controlled by the driving control signal sent by the second shutdown self-checking control circuit to turn on or turn off the connection between the second end and the third end; the power bus 61 is coupled to the load circuit 62 and the power supply circuit 63, and the power supply circuit 63 and the second power supply regulating circuit 50 are specifically used to supply power to the load circuit 62 through the power bus 61.

[0074] In some embodiments, the upper switch Qs and the lower switch Qx can be one of a MOSFET (Metal Oxide Semiconductor Field Effect Transistor), a transistor, a thin film transistor, a field effect transistor, or any other reasonable switch, which is not limited in the present application.

[0075] In other embodiments, the second power supply regulating circuit 50 can also be a single-bridge-arm bidirectional buck-boost circuit, a single-phase BUCK (buck) circuit (buck conversion circuit), or a BOOST (boost) circuit, or any other reasonable circuit topology, which is not limited in the present application.

[0076] It is worth noting that in a conventional load power supply scenario, only the power supply circuit 63 uses the input power of the power grid to control the voltage of the power bus 61 to supply power to the load circuit 62. The strength of the power bus 61 with load will cause the input current of the power grid to fluctuate, and when the load fluctuation range is severe and rapid, the input current of the entire system will be severely distorted. Especially when the front-end input distribution network system is weak and the load power is too large, the strong pull may cause serious consequences.

[0077] In some embodiments, the second power regulating circuit 50 shares the load circuit 62 with the power supply circuit 63 through the direct power supply bus 61, so as to reduce the grid input distortion. The second power regulating circuit 50 includes at least two voltage conversion sub-circuits 51 in parallel, and the energy storage sub-circuit 52 includes at least two super capacitors Cs or super lithiums in parallel. The basic topology of each voltage conversion sub-circuit 51 is a single-bridge-arm bidirectional buck-boost circuit, and the three-phase inductors inside the voltage conversion sub-circuit 51 are connected in parallel to improve the overall power.

[0078] When the load becomes heavy, i.e., the required output power of the load circuit 62 increases, the voltage on the power supply bus 61, i.e., the bus voltage, drops, the second power regulating circuit 50 discharges the energy storage to output current to the power supply bus 61, and shares the increased load with the power supply circuit 63; when the load becomes light, the bus voltage rises, the second power regulating circuit 50 absorbs current, i.e., receives the input current of the power supply bus 61 to store energy in each super capacitor Cs or super lithium, which is equivalent to increasing the load of the power supply circuit 63, so as to ensure that the load of the power supply circuit 63 fluctuates less in a period of time, thereby reducing the harmonic content of the grid-side input current.

[0079] Specifically, the second shutdown self-check control circuit periodically samples the self-check characteristic parameter from each voltage conversion sub-circuit 51 and / or the power supply bus 61 every second time interval, i.e., starts the shutdown self-check program every second time interval.

[0080] In some embodiments, since the second power regulating circuit 50 has two scenarios of outputting current and receiving input current to the power supply bus 61 under different load conditions, the self-check characteristic parameter can be input current or output current, or input power or output power, so as to use the self-check characteristic parameter for corresponding shutdown self-check.

[0081] For convenience of understanding, the self-check characteristic parameter is taken as output current in the following description, and when the self-check characteristic parameter is actually input current, it can be understood as negative current. When detecting whether the output current is less than the first threshold range, the first threshold range actually has a current positive and negative value interval.

[0082] S42: Detect whether the self-check characteristic parameter is less than the first threshold range.

[0083] S43: Obtain the first output voltage of the power regulating circuit.

[0084] S44: Obtain the second output voltage of the power regulating circuit after driving the power regulating circuit for the first time interval.

[0085] S45: detecting whether the voltage difference between the first output voltage and the second output voltage is less than a second threshold range.

[0086] S46: detecting whether the blackout cumulative time is greater than a maximum blackout time.

[0087] Wherein, S42, S43, S44, S45 and S46 are the same as S12, S13, S14, S15 and S16 in Figure 1 , please refer to S12, S13, S14, S15 and S16 and their related text description, which will not be repeated here.

[0088] S47: detecting whether the second output voltage is less than an under-voltage protection threshold range.

[0089] It can be understood that, in order to distinguish the power supply circuit 63 fault state power down, resulting in the second power supply adjustment circuit 50 output current decreases, after entering the shutdown program, further need to carry out fault under-voltage detection to the second power supply adjustment circuit 50, in order to obtain the under-voltage protection threshold range according to the under-voltage fault protection mechanism.

[0090] Specifically, when it is determined that the current blackout cumulative time is greater than the maximum blackout time, it is detected whether the second output voltage Vbus currently obtained is less than the under-voltage protection threshold range.

[0091] Wherein, if the second output voltage Vbus is less than the under-voltage protection threshold range, S48 is executed, and if the second output voltage Vbus is not less than the under-voltage protection threshold range, S48 is executed.

[0092] S48: blackout of the power supply adjustment circuit.

[0093] When it is determined that the second output voltage Vbus is less than the under-voltage protection threshold range, the second power supply adjustment circuit 50 is blacked out until it is detected that the self-checking characteristic parameter is not less than the first threshold range.

[0094] S49: obtaining the output voltage and the resonant inductance current in the power supply adjustment circuit.

[0095] Please refer to Figure 5 , Figure 5 is Figure 3 the logic framework diagram of an embodiment of the signal processing flow in the shutdown self-checking control method.

[0096] It can be understood that the second shutdown self-checking control circuit can specifically adopt a voltage outer loop-current inner loop double closed loop control architecture to realize driving control of each voltage conversion sub-circuit 51.

[0097] Specifically, the output voltage Vbus and the resonant inductance current I in each voltage conversion sub-circuit 51 are obtained.

[0098] S410: proportionally and integrally adjusting a first difference between the target reference voltage and the output voltage to obtain a reference reference current.

[0099] The target reference voltage Vbus Ref is set according to the current power supply demand, a first difference is obtained by subtracting the output voltage Vbus of each voltage conversion sub-circuit 51 from the target reference voltage Vbus Ref, and a reference reference current Iref is obtained by proportionally and integrally adjusting each first difference.

[0100] S411: proportionally and integrally adjusting a second difference between the reference reference current and the resonant inductance current to obtain a driving control signal.

[0101] Each reference reference current Iref obtained at present is subtracted by the corresponding resonant inductance current I to obtain a second difference, and a driving control signal is obtained by proportionally and integrally adjusting each second difference and further pulse width modulation.

[0102] S412: sending the driving control signal to the power supply adjusting circuit to trigger the power supply adjusting circuit to change the switching state, so as to adjust the output voltage.

[0103] Each driving control signal generated at present is sent to each voltage conversion sub-circuit 51 respectively, to trigger the upper switch tube Qs and the lower switch tube Qx in each voltage conversion sub-circuit 51 to conduct or turn off, so as to adjust the respective output voltage Vbus.

[0104] In some embodiments, the power supply circuit 63 and the second power supply adjusting circuit 50 can be a server matching power supply, the power supply circuit 63 is a PSU (Power supply unit, power supply unit), the second power supply adjusting circuit 50 is a PCS (Power Capacitor Shelf, server power supply device), and each voltage conversion sub-circuit 51 corresponds to a DC-DC (Direct Current-Direct Current, direct current to direct current) module. In the field of power supply control, the input source power failure and the power supply device under-voltage shutdown are a common path, but for the PCS with independent energy storage unit, even if the grid input source power failure or the PCS is hot pulled out from the bus system, according to the size of the currently stored energy, the PCS can continue to run for tens of seconds or minutes, and the output port voltage basically does not drop, so as to bring danger to the related staff and other electronic devices.

[0105] It is worth mentioning that due to the existence of the second shutdown self-checking control circuit internal voltage loop, the PCS can maintain the bus voltage at a normal voltage through the DC-DC module even if it is hot pulled out, and the super capacitor Cs stores energy, and the PCS cannot realize shutdown through input source undervoltage, and the maintenance time can reach minutes, which may cause safety accidents, so when the PCS is hot pulled out or the PSU is powered off, the PCS needs to be quickly and reliably shut down through the above shutdown self-checking control method to ensure safety.

[0106] When the PCS is normally connected to the PSU device, if the entire system is running in an idle state, the bus is maintained constant, and the PCS output power is very weak for a kW (kilowatt) level system, and by taking the PCS output current as a basis for judgment, when the PCS input or output current is less than a certain threshold, i.e. the first threshold range, it is determined that the PCS is running in standby mode, and the drive is blocked. At this time, if the PSU device is not powered off, the power supply bus 61 voltage will not drop even if the PCS drive is closed. If the PSU is powered off, the PCS drive will cause the voltage on the power supply bus 61 to drop rapidly, triggering the PCS undervoltage fault blocking, until the bus side is powered on again by the PSU device or the PCS is reinserted into the system to recover.

[0107] And considering that too long intermittent blocking time in an idle state may cause the PCS to fail to respond in time when a dynamic load comes, by comparing the voltage difference between the adjacent two bus voltages before and after blocking, i.e. the voltage difference between the first output voltage Vbus and the second output voltage Vbus, it is determined whether blocking needs to be continued. If the bus voltage before blocking, i.e. the first output voltage Vbus, is higher than the bus voltage at the end of blocking, i.e. the second output voltage Vbus, by a certain threshold, i.e. the voltage difference is not less than the second threshold range, it indicates that the PCS blocking will cause the bus to drop, and the blocking time will continue to increase until the maximum blocking time is reached; if there is no obvious change in the adjacent two voltages, it indicates that the PCS is running in standby mode, and there is no need to continue blocking, and the normal operation can continue.

[0108] In addition, the PCS input / output power can also be used as a basis for determining whether to enter the shutdown self-checking program, i.e. detecting whether the PCS input / output power is less than the first threshold range to determine whether to implement the corresponding drive blocking.

[0109] Therefore, the shutdown self-checking control method does not increase the hardware cost, and can realize reliable shutdown of the PCS, improve the flexibility of device operation, and has a simple structure design, simple and reliable control method, easy to implement, and high consistency of synchronous shutdown.

[0110] The application also provides an electronic device, please refer to Figure 6 , Figure 6is a structural schematic diagram of an embodiment of the electronic device. In this embodiment, the electronic device 70 comprises a housing 71 and a third shutdown self-check control circuit 72 connected to the housing 71.

[0111] It should be noted that the third shutdown self-check control circuit 72 described in this embodiment is the first shutdown self-check control circuit 20 or the second shutdown self-check control circuit described in any of the above embodiments, and specific details can be referred to Figures 1-5 and related text content, which will not be repeated here.

[0112] The beneficial effects of the present application are: unlike the prior art, the shutdown self-check control method provided by the present application acquires the self-check characteristic parameter of the power regulation circuit, acquires the first output voltage of the power regulation circuit when the self-check characteristic parameter is less than the first threshold range, and acquires the second output voltage of the power regulation circuit after driving the power regulation circuit for the first shutdown duration, so that when the voltage difference between the first output voltage and the second output voltage is not less than the second threshold range and the shutdown cumulative time is not greater than the maximum shutdown time, the shutdown of the power regulation circuit is continuously maintained, thereby corresponding to the change of the self-check characteristic parameter in the power regulation circuit shutdown scenario, the power regulation circuit is driven and shutdown in time, so as to rapidly reduce the output voltage of the power regulation circuit, thereby avoiding the danger of internal stored energy when the power regulation circuit is shut down; and without additional shutdown hardware switch, the cost is low, and the control method is more flexible; in addition, it can also effectively avoid the misoperation of driving and shutdown when the voltage difference is less than the second threshold range, i.e. in the light load or idle standby state of the power regulation circuit, so as to affect the timely response of the power regulation circuit to load changes to adjust the power supply output, thereby effectively improving the dynamic response performance of the power regulation circuit.

[0113] The above is only an embodiment of the present application, and does not limit the patent scope of the present application, and any equivalent structure or equivalent flow transformation using the content of the specification and drawings, or direct or indirect application in other related technical fields, are also included in the patent protection scope of the present application.

Claims

1. A power-off self-test control method, applied to power-off self-test control of a power supply regulation circuit, characterized in that, The power-off self-test control method includes: Obtain the self-test characteristic parameters in the power regulation circuit; Detect whether the self-test feature parameter is less than the first threshold range; If the self-test characteristic parameter is less than the first threshold range, obtain the first output voltage of the power regulation circuit; After driving the power regulation circuit to block the waveform for a first duration, the second output voltage of the power regulation circuit is obtained. Detect whether the voltage difference between the first output voltage and the second output voltage is less than a second threshold range; If the voltage difference is not less than the second threshold range, detect whether the cumulative sealing time is greater than the maximum sealing time; If the cumulative sealing time is not greater than the maximum sealing time, return to the step of obtaining the first output voltage of the power supply regulation circuit.

2. The shutdown self-test control method according to claim 1, characterized in that, The power-off self-test control method includes: If the self-test characteristic parameter is not less than the first threshold range, obtain the power supply characteristic parameter in the power regulation circuit; The drive control signal is generated using the power supply characteristic parameters; The drive control signal is sent to the power conditioning circuit to trigger the power conditioning circuit to change the switching state.

3. The shutdown self-test control method according to claim 2, characterized in that, The step of obtaining the power supply characteristic parameters in the power conditioning circuit includes: Obtain the output voltage and resonant inductor current in the power supply regulation circuit; The step of generating the drive control signal using the power supply characteristic parameters includes: The reference current is obtained by performing proportional-integral adjustment on the first difference between the target reference voltage and the output voltage; The drive control signal is obtained by proportional-integral adjustment of the second difference between the reference current and the resonant inductor current.

4. The shutdown self-test control method according to claim 2, characterized in that, The power-off self-test control method includes: If the voltage difference is less than the second threshold range, the step of obtaining the power supply characteristic parameters in the power regulation circuit is performed.

5. The shutdown self-test control method according to claim 4, characterized in that, The power-off self-test control method includes: If the cumulative blocking time is greater than the maximum blocking time, detect whether the second output voltage is less than the undervoltage protection threshold range; If the second output voltage is not less than the undervoltage protection threshold range, the step of obtaining the power supply characteristic parameters in the power conditioning circuit is executed.

6. The shutdown self-test control method according to claim 5, characterized in that, The power-off self-test control method includes: If the second output voltage is less than the undervoltage protection threshold range, the power supply regulation circuit is driven to block the voltage.

7. The power-off self-test control method according to any one of claims 1-6, wherein the power supply regulation circuit comprises a main phase voltage conversion circuit and a slave phase voltage conversion circuit connected in parallel, characterized in that, The first duration of blocking the power supply regulation circuit includes: Set the synchronous output port in the main phase voltage conversion circuit so that the slave phase voltage conversion circuit and the main phase voltage conversion circuit can synchronously perform the first duration of drive blocking.

8. The shutdown self-test control method according to any one of claims 1-6, characterized in that, The process of obtaining the self-test characteristic parameters of the power regulation circuit includes: The self-test characteristic parameters of the power supply regulation circuit are acquired at a second time interval; wherein the second time interval is longer than the maximum blocking time, and the self-test characteristic parameters include one or more of the following: input current, output current, input power, and output power.

9. A power-off self-test control circuit, characterized in that, The power-off self-test control circuit is coupled to the power supply regulation circuit. The power-off self-test control circuit uses the power-off self-test control method as described in any one of claims 1-8 to implement power-off self-test control for the power regulation circuit.

10. An electronic device, characterized in that, The electronic device includes a housing and a power-off self-test control circuit connected to the housing; The power-off self-test control circuit is the power-off self-test control circuit as described in claim 9.

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