Inductive connection detection circuit and method

Abstract

The application discloses an inductance connection detection circuit and method, and relates to the technical field of power supplies. The circuit is used for detecting the connection state of a compensation inductance in a TLVR circuit. The inductance connection detection circuit comprises a voltage sampling module, a differential amplification module and a voltage calculation module. One end of the compensation inductance is electrically connected to a first sampling port, the other end of the compensation inductance is electrically connected to a second sampling port, the first sampling port is electrically connected to a first amplification port, the second sampling port is electrically connected to a second amplification port, the first amplification port is electrically connected to a third amplification port, the second amplification port is electrically connected to a first calculation port, a fourth amplification port is grounded, and the second calculation port is electrically connected to a controller. The voltage calculation module is used for calculating the voltage statistical value of the voltage of the third amplification port within a preset time period and outputting the voltage statistical value to the controller.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of power supply, in particular to an inductor connection detection circuit and method. BACKGROUND

[0002] TLVR (Trans-Inductor Voltage Regulator) technology improves the performance of traditional multi-phase power supply by increasing the coupling between the inductors of each phase. Due to its fast transient response, voltage overshoot improvement and other characteristics, TLVR is widely used in high-performance CPUs mounted on servers, and has become a development trend of future multi-phase power supply. Figure 1 As shown in the figure, the primary coil of the transformer used by TLVR is connected to the switch at one end and serves as the output end at the other end; the secondary coils of the transformer are connected in series and connected to the compensation inductor. The square root of the current of the compensation inductor is small in the steady state, and only when the load transient current changes greatly, the compensation inductor will bear a large current in a short time. Therefore, the compensation inductor and the secondary of the transformer can be wound with thin coils to reduce the package size.

[0003] As a key element of TLVR, the connection state of the compensation inductor in the circuit will directly affect the performance of TLVR. The compensation inductor is usually connected to the circuit through soldering. If the compensation inductor is open due to soldering, then each phase transformer will be equivalent to an inductor due to the open secondary during circuit operation, and TLVR will not be able to improve the dynamic response. If the compensation inductor is short-circuited due to soldering, the current flowing through the circuit during operation will increase sharply, causing the inductor to burn out. Therefore, there is an urgent need for a compensation inductor connection detection circuit and method to enable the power supply controller to detect the connection state of the compensation inductor during the power-on initialization phase, and to stop the circuit operation in time and issue a prompt when a connection fault of the compensation inductor is encountered, so as to avoid the performance degradation of the power supply module due to the connection fault of the compensation inductor or the damage of the elements of the circuit. SUMMARY

[0004] In order to solve the problem in the prior art that TLVR is powered on without determining the connection state of the compensation inductor, which may result in the inability to improve the dynamic response due to the open compensation inductor, or the burning out of the inductor due to the short circuit of the compensation inductor, the present application provides an inductor connection detection circuit and method, which detects the connection state of the compensation inductor during the power-on initialization phase, stops the circuit operation in time and issues an alarm prompt when a connection fault of the compensation inductor is encountered, so as to avoid the performance degradation of the power supply module due to the connection fault of the compensation inductor or the damage of the elements of the circuit.

[0005] In order to solve one or more of the above technical problems, the technical solution adopted by the present application is as follows:

[0006] In a first aspect, an inductance connection detection circuit is provided for detecting a connection state of a compensation inductor in a TLVR circuit, the TLVR circuit comprising: the compensation inductor and a controller, one end of the compensation inductor being electrically connected to a secondary coil in the TLVR circuit, and the other end of the compensation inductor being grounded; and the controller being configured to provide a driving signal to the TLVR circuit.

[0007] The inductance connection detection circuit comprises: a voltage sampling module, a differential amplification module, and a voltage calculation module.

[0008] The voltage sampling module comprises: a first sampling port, a second sampling port, and a third sampling port.

[0009] The differential amplification module comprises: a first amplification port, a second amplification port, a third amplification port, and a fourth amplification port.

[0010] The voltage calculation module comprises: a first calculation port and a second calculation port.

[0011] The first sampling port is electrically connected to one end of the compensation inductor, the second sampling port is electrically connected to the other end of the compensation inductor, the third sampling port is electrically connected to the first amplification port, the second amplification port is electrically connected to the second sampling port, the third amplification port is electrically connected to the first calculation port, the fourth amplification port is grounded, and the second calculation port is electrically connected to the controller.

[0012] The voltage calculation module is configured to calculate a voltage statistical value of the voltage at the third amplification port within a preset time period, and output the voltage statistical value to the controller.

[0013] Further, the voltage sampling module comprises: a capacitor and a first resistor.

[0014] One end of the capacitor serves as the first sampling port, the other end of the capacitor is electrically connected to one end of the first resistor and serves as the third sampling port, and the other end of the first resistor is grounded.

[0015] Further, the differential amplification module comprises: an operational amplifier, a second resistor, a third resistor, a fourth resistor, and a fifth resistor.

[0016] The operational amplifier comprises: a non-inverting input terminal, an inverting input terminal, and an operational amplifier output terminal.

[0017] The non-inverting input terminal is connected in series with the second resistor and serves as the first amplification port, the non-inverting input terminal is also connected in series with the fourth resistor and grounded, the inverting input terminal is connected in series with the third resistor and serves as the second amplification port, the inverting input terminal is also electrically connected to one end of the fifth resistor, and the other end of the fifth resistor is electrically connected to the operational amplifier output terminal.

[0018] Further, the voltage statistical value comprises: a peak voltage, a root mean square voltage, or a voltage effective value.

[0019] Further, the first resistor has a resistance greater than a preset resistance, and the preset resistance is expressed as: wherein, is a voltage across the first resistor.

[0020] In a second aspect, an inductance connection detection method is provided for detecting a connection state of a compensation inductor in a TLVR circuit by using the inductance connection detection circuit according to the first aspect, and the inductance connection detection method comprises the following steps.

[0021] sending a pulse signal with a preset time width to any phase circuit;

[0022] obtaining a voltage statistical value calculated by the voltage calculation module within the preset time period;

[0023] judging the connection state of the compensation inductor according to the voltage statistical value and a preset voltage value, wherein the preset voltage value is used to represent the voltage statistical value when the compensation inductor is normally connected.

[0024] Further, judging the connection state of the compensation inductor according to the voltage statistical value and the preset voltage value comprises:

[0025] if the voltage statistical value is equal to the preset voltage value, determining that the connection state of the compensation inductor is normal;

[0026] if the voltage statistical value is not equal to the preset voltage value, determining that the connection state of the compensation inductor is abnormal, and judging an abnormal connection condition of the compensation inductor.

[0027] Further, judging the abnormal connection condition of the compensation inductor comprises:

[0028] if the voltage statistical value is equal to 0, determining that the compensation inductor is open-circuit.

[0029] Further, judging the abnormal connection condition of the compensation inductor further comprises:

[0030] if the voltage statistical value exceeds 1.3 times of a preset voltage threshold, determining that the compensation inductor is short-circuit.

[0031] Further, the method further comprises: if it is determined that the connection state of the compensation inductor is abnormal, setting a fault register according to the abnormal connection state, and setting the output of the pulse width modulation signal and the inverted pulse width modulation signal to low.

[0032] The technical scheme provided by the embodiments of the present application has the following beneficial effects:

[0033] By implementing the inductance connection detection circuit and method disclosed in the embodiments of the present application, the TLVR circuit can detect the connection failure of the compensation inductance during the power-on initialization, so as to avoid the TLVR circuit from being affected in performance or damaged due to the connection abnormality of the compensation inductance. BRIEF DESCRIPTION OF DRAWINGS

[0034] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the embodiments 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 any creative effort based on these drawings.

[0035] Figure 1 FIG. 1 is a schematic diagram of a TLVR circuit;

[0036] Figure 2 FIG. 2 is a schematic diagram of an inductance connection detection circuit module provided by the embodiments of the present application;

[0037] Figure 3 FIG. 3 is a schematic diagram of an inductance connection detection circuit provided by the embodiments of the present application;

[0038] Figure 4 FIG. 4 is a schematic diagram of a compensation inductance current waveform provided by the embodiments of the present application;

[0039] Figure 5 FIG. 5 is a schematic diagram of an inductance connection detection method provided by the embodiments of the present application. DETAILED DESCRIPTION

[0040] In order to make the objects, technical solutions and advantages of the present application more clear, the technical solutions in the embodiments of the present application will be described clearly and completely with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some embodiments of the present application, but not all the embodiments. Based on the embodiments in the present application, all the other embodiments obtained by those skilled in the art without any creative effort belong to the protection scope of the present application.

[0041] Unless otherwise defined, technical terms or scientific terms used in the present disclosure shall have the ordinary meaning as understood by a person having ordinary skill in the art to which the present disclosure pertains. The terms "first", "second", and similar terms used in the present disclosure do not denote any order, quantity, or importance, but are used to distinguish different components. Similarly, the terms "one", "a", or "the" and similar terms do not denote a quantity of particular mentioned items, but indicate the existence of at least one of the items. The numbers in the drawings of the specification only represent the distinction of the respective functional components or modules, and do not represent the logical relationship between the components or modules. The terms "include" or "contain" and similar terms mean that the elements or objects before the terms encompass the elements or objects listed after the terms and their equivalents, and do not exclude other elements or objects. The terms "connect" or "connected" and similar terms are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. The terms "upper", "lower", "left", "right", and the like only represent relative positional relationships, which can change when the absolute positions of the described objects change.

[0042] For the component symbols involved in the present application, the type of component is indicated in the circuit diagram, and each component is distinguished, for example: R1, R2, C, etc.; in the corresponding formula, the size of the corresponding physical quantity of the component is indicated, and is distinguished by italics, for example: the resistance value corresponding to the resistance R1 is R1.

[0043] In the following, various embodiments according to the present disclosure will be described in detail with reference to the accompanying drawings. It should be noted that in the drawings, the same reference numerals are assigned to components having substantially the same or similar structure and function, and repeated descriptions thereof will be omitted.

[0044] For the problem that electromagnetic radiation of clock signal not connected to a baseboard management controller exceeds the standard due to the compatibility design of the printed circuit board in the prior art, the embodiment of the present application provides a clock signal electromagnetic radiation suppression circuit, a circuit board and a method, which automatically turn off the clock signal not connected to the baseboard management controller instead of manually, so as to reduce the electromagnetic radiation level and make the product electromagnetic radiation reach the corresponding standard.

[0045] In one embodiment, an inductance connection detection circuit is used to detect the connection state of a compensation inductance L C In a TLVR circuit. As shown in Figure 1 , the TLVR circuit includes a voltage input end IN, a voltage output end OUT, a controller, N phase circuits and a compensation inductance L CWherein, N is a natural number, and the value of N is determined by the TLVR current. The controller is configured to provide a driving signal to the TLVR circuit, and specifically, the controller comprises a pulse width modulation pin and an inverted pulse width modulation pin. The phase circuit comprises a high-side MOS tube, a low-side MOS tube, a primary coil, a secondary coil, a voltage input end IN electrically connected to the drain of the high-side MOS tube, a source of the high-side MOS tube electrically connected to the drain of the low-side MOS tube, a source of the low-side MOS tube grounded, the source of the high-side MOS tube electrically connected to one end of the primary coil, the other end of the primary coil electrically connected to a voltage output end OUT, the secondary coil coupled to the primary coil, one end of the secondary coil electrically connected to one end of a compensation inductor L C , the other end of the compensation inductor L C grounded, the gate of the high-side MOS tube electrically connected to the pulse width modulation pin of the controller, and the gate of the low-side MOS tube electrically connected to the inverted pulse width modulation pin of the controller.

[0046] As shown in Figure 2 , the inductance connection detection circuit comprises a voltage sampling module 100, a differential amplification module 200, and a voltage calculation module 300.

[0047] The voltage sampling module 100 comprises a first sampling port 101, a second sampling port 102, and a third sampling port 103.

[0048] The differential amplification module 200 comprises a first amplification port 201, a second amplification port 202, a third amplification port 203, and a fourth amplification port 204.

[0049] The voltage calculation module 300 comprises a first calculation port 301 and a second calculation port 302.

[0050] The first sampling port 101 is electrically connected to one end of the compensation inductor L C , the second sampling port 102 is electrically connected to the other end of the compensation inductor L C , the third sampling port 103 is electrically connected to the first amplification port 201, the second amplification port 202 is electrically connected to the second sampling port 102, the third amplification port 203 is electrically connected to the first calculation port 301, the fourth amplification port 204 is grounded, and the second calculation port 302 is electrically connected to the controller.

[0051] The voltage calculation module 300 is configured to calculate a voltage statistical value of the voltage of the third amplification port 203 within a preset time period and output the voltage statistical value to the controller.

[0052] Specifically, as shown in Figure 3 , the voltage sampling module 100 comprises a capacitor C and a first resistor R1.

[0053] One end of the capacitor C is as the first sampling port 101, the other end of the capacitor C is electrically connected with one end of the first resistor R1 and then as the third sampling port 103, the other end of the first resistor R1 is grounded.

[0054] The network composed of the compensation inductance L C , the first resistor R1 and the capacitor C satisfies the following formula:

[0055] ;

[0056] Wherein, R DC represents the equivalent internal resistance of the compensation inductance L C , R1 is the resistance value of the first resistor R1, L C is the inductance value of the compensation inductance.

[0057] If the current flowing through the inductance L C is i Lc , the voltage across the inductance L C is U Lc , then:

[0058] ;

[0059] Wherein, ω represents the angular frequency.

[0060] Therefore, the voltage across the capacitor C is equal to the voltage across the resistor R DC . After dividing by R DC , the inductance current i Lc can be obtained.

[0061] In the initialization process of the controller power-on, a pulse width modulation signal is sent to the high side MOS tube of any one phase circuit. In one embodiment, the pulse width is 1 μs, a voltage pulse is generated on the primary coil of the corresponding phase circuit, and is coupled to the corresponding secondary coil, so that a voltage pulse with a value of Vi and a duration of 1 μs is generated on the phase circuit secondary coil, the compensation inductance L C and the compensation inductance L C . The voltage pulse makes the inductance current i Lc of the compensation inductance L C rise from 0 to the peak value, and after the voltage pulse ends, the inductance current i Lc slowly decreases from the peak value, as shown in FIG. 3. Figure 4

[0062] The current peak flowing through the compensation inductance L C is represented by the following formula:

[0063] ;

[0064] Wherein, L mrepresents the magnetizing inductance of the secondary winding of the phase circuit in the TLVR circuit except for the secondary winding of the phase circuit; N represents the number of phases of the TLVR circuit, which is determined by the current of the TLVR circuit; and Δt represents the pulse width.

[0065] As shown in Figure 3 the differential amplification module 200 comprises an operational amplifier OP, a second resistor R2, a third resistor R3, a fourth resistor R4, and a fifth resistor R5.

[0066] The operational amplifier OP comprises a non-inverting input OP1, an inverting input OP2, and an operational amplifier output OP3.

[0067] The non-inverting input OP1 is connected in series with the second resistor R2 to form a first amplification port 201, and the non-inverting input OP1 is also connected in series with the fourth resistor R4 to ground. The inverting input OP2 is connected in series with the third resistor R3 to form a second amplification port 202, and the inverting input OP2 is also electrically connected to one end of the fifth resistor R5, and the other end of the fifth resistor R5 is electrically connected to the operational amplifier output OP3.

[0068] The voltage calculation module 300 calculates the voltage of the operational amplifier output OP3 to obtain a voltage statistical value, and compares the voltage statistical value with a preset voltage value. The voltage statistical value includes a peak voltage, a root mean square voltage, or a voltage effective value. If the voltage statistical value is equal to the preset voltage value, it is determined that the connection state of the compensation inductance is normal. If the voltage statistical value is not equal to the preset voltage value, it is determined that the connection state of the compensation inductance is abnormal. Further, if the voltage statistical value is equal to 0, it is determined that the compensation inductance L C is open-circuit. If the voltage statistical value exceeds 1.3 times of the preset voltage threshold value, it is determined that the compensation inductance L C is short-circuit.

[0069] In one embodiment, the TLVR circuit is an 8-phase TLVR circuit, the input voltage V i is 12V, the output voltage is 1V, the magnetizing inductance L m is 100nH, the primary winding and the secondary winding have a ratio of 1:1, the compensation inductance L C is 300nH, the equivalent internal resistance R DC is 1mΩ, and the switching frequency is 500kHz.

[0070] The resistor R1 is usually selected as a 0603 package, and the power thereof is 1 / 16W. Therefore, the power consumed by the resistor needs to be less than 1 / 16W. It can be deduced that the voltage across the resistor R1 is:

[0071]

[0072] For the 8-phase TLVR, the compensation inductance L C ​The current pulses 8 times in one switching cycle, so ω = 8 x 2π x 500k, V Lc The effective value of the input voltage 12V under steady-state conditions is brought into the above formula to obtain the voltage effective value across R1 as 12V. According to the maximum power of the 0603 resistor 1 / 16W, we obtain:

[0073] Therefore, the resistance value of the first resistor R1 is represented by the following formula:

[0074] ;

[0075] The expression of the preset resistance value is: wherein, is the voltage across the first resistor.

[0076] The calculation with the element values shows that the resistance value of the first resistor R1 is not less than 2.3kΩ.

[0077] Preferably, based on the preset resistance value, the value of R1 is left with a margin of twice, R1 = 5k, and according to the formula:

[0078] ;

[0079] The calculation shows that the specification of the capacitor C is C = 20nF.

[0080] The differential amplification factor of the operational amplifier OP is, and R2 = R3 = 1k and R4 = R5 = 50k are selected.

[0081] In another embodiment, an inductance connection detection method is used to detect the connection state of the compensation inductor L C in the TLVR circuit through the inductance connection detection circuit according to the first aspect described above, as shown in the figure, the inductance connection detection method comprises: Figure 5

[0082] S100: sending a pulse signal with a preset time period to any phase circuit;

[0083] S200: obtaining the voltage statistical value calculated by the voltage calculation module within the preset time period;

[0084] S300: judging the connection state of the compensation inductor according to the voltage statistical value and the preset voltage value, wherein the preset voltage value is used to represent the voltage statistical value when the compensation inductor is normally connected.

[0085] According to the formula:

[0086] ;

[0087] In combination with the 8-phase TLVR circuit, the input voltage V​i = 12V, output voltage 1V, excitation inductance L m = 100nH, primary coil and secondary coil ratio 1:1, compensation inductance L C = 300nH, equivalent resistance R DC = 1mΩ, switching frequency 500kHz, pulse width 1μs. The peak current i pk = 1.2A, compensation inductance L C A peak voltage of 1.2mV is formed on the upper, and the voltage at the output end of the operational amplifier after differential amplification is 60mV.

[0088] According to the voltage statistical value and the preset voltage value, the connection state of the compensation inductance is determined, including:

[0089] If the voltage statistical value is equal to the preset voltage value, it is determined that the connection state of the compensation inductance is normal;

[0090] If the voltage statistical value is not equal to the preset voltage value, it is determined that the connection state of the compensation inductance is abnormal, and the abnormal connection condition of the compensation inductance is determined.

[0091] The abnormal connection condition of the compensation inductance is determined, including:

[0092] If the voltage statistical value is equal to 0, it is determined that the compensation inductance L C is open circuit.

[0093] The abnormal connection condition of the compensation inductance is determined, including:

[0094] If the voltage statistical value exceeds 1.3 times of the preset voltage threshold value, it is determined that the compensation inductance L C is short circuit.

[0095] In one embodiment, the peak voltage is used as the voltage statistical value to determine the connection state of the compensation inductance L C . At this time, the preset voltage value is 60mV, and when the voltage statistical value is the peak voltage.

[0096] If the peak voltage is equal to 60mV, it is determined that the connection state of the compensation inductance L C is normal;

[0097] If the peak voltage is not equal to 60mV, it is determined that the connection state of the compensation inductance L C is abnormal. At this time, the abnormal connection condition of the compensation inductance L C is further determined:

[0098] If the peak voltage is equal to 0, it is determined that the compensation inductance L C is open circuit;

[0099] If the peak voltage exceeds 78mV, it is determined that the compensation inductance LC Short circuit.

[0100] The statistical method for voltage statistics, and the logic for comparing voltage statistics with preset voltage values, are stored in the controller's internal memory.

[0101] The above method also includes: if the connection status of the compensation inductor is determined to be abnormal, the fault register is set according to the abnormal connection status, and the outputs of the pulse width modulation signal and the inverted pulse width modulation signal are both set to low level.

[0102] When determining the compensation inductor L C When the connection status is abnormal, the controller sets the fault register according to the specific abnormal connection status, making it easier to read information via the SMbus bus. At the same time, the controller also sets the outputs of the pulse width modulation signal and the inverted pulse width modulation signal to a low level to cut off the TLVR circuit and prevent the TLVR circuit from operating malfunctioning or its components from being damaged.

[0103] The beneficial effects of the technical solution provided by the embodiments of the present invention are as follows:

[0104] By implementing the inductor connection detection circuit and method disclosed in the embodiments of the present invention, the TLVR circuit can detect connection faults of the compensation inductor during power-on initialization, thereby preventing the TLVR circuit from being affected by abnormal connection of the compensation inductor or from damaging components.

[0105] All of the above-mentioned optional technical solutions can be combined in any way to form optional embodiments of the present invention, and will not be described in detail here.

[0106] Example 1

[0107] In one embodiment, an inductor connection detection circuit is used to detect the compensation inductor L in a TLVR circuit. C The connection status. For example... Figure 1 As shown, the TLVR circuit includes: voltage input terminal IN, voltage output terminal OUT, controller, N phase circuits, and compensation inductor L. C Where N is a natural number, and its value is determined by the TLVR current. The controller provides drive signals to the TLVR circuit. Specifically, the controller includes a pulse width modulation (PWM) pin and an inverting PWM pin. The phase circuit includes a high-side MOSFET, a low-side MOSFET, a primary coil, and a secondary coil. The voltage input terminal IN is electrically connected to the drain of the high-side MOSFET, the source of the high-side MOSFET is electrically connected to the drain of the low-side MOSFET, the source of the low-side MOSFET is grounded, the source of the high-side MOSFET is electrically connected to one end of the primary coil, the other end of the primary coil is electrically connected to the voltage output terminal OUT, the secondary coil is coupled to the primary coil, and one end of the secondary coil is connected to the compensation inductor L. Cone end of the compensation inductor L C the other end is grounded, the gate of the high-side MOS tube is electrically connected with a pulse width modulation pin of the controller, and the gate of the low-side MOS tube is electrically connected with an inverted pulse width modulation pin of the controller.

[0108] As shown in Figure 2 , the inductance connection detection circuit comprises: a voltage sampling module 100, a differential amplification module 200, and a voltage calculation module 300.

[0109] The voltage sampling module 100 comprises: a first sampling port 101, a second sampling port 102, and a third sampling port 103.

[0110] The differential amplification module 200 comprises: a first amplification port 201, a second amplification port 202, a third amplification port 203, and a fourth amplification port 204.

[0111] The voltage calculation module 300 comprises: a first calculation port 301 and a second calculation port 302.

[0112] The first sampling port 101 is electrically connected with one end of the compensation inductor L C , the second sampling port 102 is electrically connected with the other end of the compensation inductor L C , the third sampling port 103 is electrically connected with the first amplification port 201, the second amplification port 202 is electrically connected with the second sampling port 102, the third amplification port 203 is electrically connected with the first calculation port 301, the fourth amplification port 204 is grounded, and the second calculation port 302 is electrically connected with the controller.

[0113] The voltage calculation module 300 is configured to calculate a voltage statistical value of the voltage of the third amplification port 203 within a preset time period, and output the voltage statistical value to the controller.

[0114] Embodiment Two

[0115] In one embodiment, an inductance connection detection circuit is used to detect the connection state of a compensation inductor L C in a TLVR circuit. As shown in Figure 1 , the TLVR circuit comprises: a voltage input end IN, a voltage output end OUT, a controller, N phase circuits, and a compensation inductor L CWherein, N is a natural number, and the value of N is determined by the TLVR current. The controller is configured to provide a driving signal to the TLVR circuit, and specifically, the controller comprises a pulse width modulation pin and an inverted pulse width modulation pin. The phase circuit comprises a high-side MOS tube, a low-side MOS tube, a primary coil, a secondary coil, a voltage input end IN electrically connected to the drain of the high-side MOS tube, a source of the high-side MOS tube electrically connected to the drain of the low-side MOS tube, a source of the low-side MOS tube grounded, the source of the high-side MOS tube electrically connected to one end of the primary coil, the other end of the primary coil electrically connected to a voltage output end OUT, the secondary coil coupled to the primary coil, one end of the secondary coil electrically connected to one end of a compensation inductor L C , the other end of the compensation inductor L C grounded, the gate of the high-side MOS tube electrically connected to the pulse width modulation pin of the controller, and the gate of the low-side MOS tube electrically connected to the inverted pulse width modulation pin of the controller.

[0116] As shown in Figure 2 , the inductance connection detection circuit comprises a voltage sampling module 100, a differential amplification module 200, and a voltage calculation module 300.

[0117] The voltage sampling module 100 comprises a first sampling port 101, a second sampling port 102, and a third sampling port 103.

[0118] The differential amplification module 200 comprises a first amplification port 201, a second amplification port 202, a third amplification port 203, and a fourth amplification port 204.

[0119] Specifically, the voltage calculation module 300 comprises a first calculation port 301 and a second calculation port 302.

[0120] The first sampling port 101 is electrically connected to one end of the compensation inductor L C , the second sampling port 102 is electrically connected to the other end of the compensation inductor L C , the third sampling port 103 is electrically connected to the first amplification port 201, the second amplification port 202 is electrically connected to the second sampling port 102, the third amplification port 203 is electrically connected to the first calculation port 301, the fourth amplification port 204 is grounded, and the second calculation port 302 is electrically connected to the controller.

[0121] The voltage calculation module 300 is configured to calculate a voltage statistical value of the voltage of the third amplification port 203 within a preset time period and output the voltage statistical value to the controller.

[0122] Specifically, as shown in Figure 3 , the voltage sampling module 100 comprises a capacitor C and a first resistor R1.

[0123] One end of the capacitor C is the first sampling port 101, the other end of the capacitor C is electrically connected with one end of the first resistor R1 and then is the third sampling port 103, and the other end of the first resistor R1 is grounded.

[0124] The network composed of the compensation inductor L C , the first resistor R1 and the capacitor C satisfies the following formula:

[0125] ;

[0126] Wherein, R DC represents the equivalent internal resistance of the compensation inductor L C , R1 is the resistance value of the first resistor R1, and L C is the inductance value of the compensation inductor.

[0127] If the current flowing through the inductor L C is i Lc , and the voltage across the inductor L C is U Lc , then:

[0128] ;

[0129] Wherein, ω represents the angular frequency.

[0130] Therefore, the voltage across the capacitor C is equal to the voltage across the resistor R DC . After dividing by R DC , the inductor current i Lc is obtained.

[0131] In the initialization process of the controller power-on, a pulse width modulation signal is sent to the high side MOS tube of any one phase circuit. In one embodiment, the pulse width is 1 μs, a voltage pulse is generated on the primary coil of the corresponding phase circuit, and is coupled to the corresponding secondary coil, so that a voltage pulse with a value of Vi and a duration of 1 μs is generated on the phase circuit secondary coil, the compensation inductor L C and the phase circuit secondary coil connected in series. The voltage pulse makes the inductor current i C of the compensation inductor L Lc rise from 0 to the peak value, and after the voltage pulse ends, the inductor current i Lc slowly decreases from the peak value, as shown in FIG. 5. Figure 4

[0132] The current peak flowing through the compensation inductor L C is represented by the following formula:

[0133] ;

[0134] Wherein, L m ​represents the magnetizing inductance of the secondary winding of the phase circuit in the TLVR circuit except for the secondary winding of the phase circuit; N represents the number of phases of the TLVR circuit, which is determined by the current of the TLVR circuit; and Δt represents the pulse width.

[0135] As shown in Figure 3 the differential amplification module 200 comprises an operational amplifier OP, a second resistor R2, a third resistor R3, a fourth resistor R4, and a fifth resistor R5.

[0136] The operational amplifier OP comprises a non-inverting input OP1, an inverting input OP2, and an operational amplifier output OP3.

[0137] The non-inverting input OP1 is connected in series with the second resistor R2 to form a first amplification port 201, and the non-inverting input OP1 is also connected in series with the fourth resistor R4 to ground. The inverting input OP2 is connected in series with the third resistor R3 to form a second amplification port 202, and the inverting input OP2 is also electrically connected to one end of the fifth resistor R5, and the other end of the fifth resistor R5 is electrically connected to the operational amplifier output OP3.

[0138] The voltage calculation module 300 calculates the voltage of the operational amplifier output OP3 to obtain a voltage statistical value, and compares the voltage statistical value with a preset voltage value. The voltage statistical value includes a peak voltage, a root mean square voltage, or a voltage effective value. If the voltage statistical value is equal to the preset voltage value, it is determined that the connection state of the compensation inductance is normal. If the voltage statistical value is not equal to the preset voltage value, it is determined that the connection state of the compensation inductance is abnormal. Further, if the voltage statistical value is equal to 0, it is determined that the compensation inductance L C is open-circuit. If the voltage statistical value exceeds 1.3 times of the preset voltage threshold value, it is determined that the compensation inductance L C is short-circuit.

[0139] In one embodiment, the TLVR circuit is an 8-phase TLVR circuit, the input voltage V i is 12V, the output voltage is 1V, the magnetizing inductance L m is 100nH, the primary winding and the secondary winding have a ratio of 1:1, the compensation inductance L C is 300nH, the equivalent internal resistance R DC is 1mΩ, and the switching frequency is 500kHz.

[0140] The resistance R1 is usually selected as a 0603 package, and the power thereof is 1 / 16W. Therefore, the power consumed by the resistance needs to be less than 1 / 16W. It can be deduced that the voltage across the resistance R1 is:

[0141]

[0142] For the 8-phase TLVR, the compensation inductance L C ​The current pulses 8 times in one switching cycle, so ω = 8 x 2π x 500k, V Lc The effective value of the input voltage 12V under steady-state conditions, into the above formula can be obtained R1 voltage effective value of 12V. According to the maximum power of 0603 resistance 1 / 16W:

[0143] ;

[0144] Therefore, the resistance of the first resistor R1 is represented by the following formula:

[0145]

[0146] The expression of the preset resistance value is: , wherein, is the voltage across the first resistor.

[0147] The element values are brought into the calculation, the resistance of the first resistor R1 is not less than 2.3kΩ.

[0148] In another embodiment, on the basis of the preset resistance value, the value of R1 is left out twice the margin, R1 = 5k, then according to the formula:

[0149] ;

[0150] The calculation of the capacitor C is: C = 20nF.

[0151] The differential amplification of the operational amplifier OP is, select R2 = R3 = 1k, R4 = R5 = 50k.

[0152] Example three

[0153] The following will be combined Figure 5 , specifically described a kind of inductance connection detection method, the method is used to detect the connection state of compensation inductance L C In TLVR circuit by the above first aspect recorded a kind of inductance connection detection circuit.

[0154] The method comprises:

[0155] S100: sending a pulse signal with a preset time period to any phase circuit;

[0156] S200: obtaining the voltage statistical value calculated by the voltage calculation module within the preset time period;

[0157] S300: determining the connection state of the compensation inductance according to the voltage statistical value and the preset voltage value, wherein the preset voltage value represents the voltage statistical value when the compensation inductance is normally connected.

[0158] Example four

[0159] In another embodiment, an inductance connection detection method specifically comprises:

[0160] S100: sending a pulse signal with a preset time period to any phase circuit;

[0161] S200: obtaining a voltage statistical value calculated by a voltage calculation module within the preset time period;

[0162] S300: judging the connection state of the compensation inductance according to the voltage statistical value and a preset voltage value, wherein the preset voltage value is used to represent the voltage statistical value when the compensation inductance is normally connected.

[0163] According to the formula:

[0164] ;

[0165] In combination with the 8-phase TLVR circuit, the input voltage V i =12V, the output voltage V m =1V, the excitation inductance L C =100nH, the primary coil and the secondary coil have a ratio of 1:1, the compensation inductance L DC =300nH, the equivalent internal resistance R DC =1mΩ, the switching frequency is 500kHz, and the pulse width is 1μs. The peak current i pk =1.2A is calculated, and a peak voltage of 1.2mV is formed on the compensation inductance L C , and the op-amp output voltage is 60mV after differential amplification.

[0166] The peak voltage is used as the voltage statistical value, the preset voltage value is 60mV, and the connection state of the compensation inductance L C is judged.

[0167] If the peak voltage is equal to 60mV, it is determined that the connection state of the compensation inductance L C is normal.

[0168] If the peak voltage is not equal to 60mV, it is determined that the connection state of the compensation inductance L C is abnormal. At this time, the abnormal connection condition of the compensation inductance L C is further judged:

[0169] If the peak voltage is equal to 0, it is determined that the compensation inductance L C is open.

[0170] If the peak voltage exceeds 78mV, it is determined that the compensation inductance L C is short-circuited.

[0171] The statistical method of the voltage statistical value and the logic of comparing the voltage statistical value with the preset voltage value are stored in an internal memory of the controller.

[0172] The method further includes: if the connection state of the compensation inductor is determined to be abnormal, S400: setting a fault register according to the abnormal connection state, and setting the outputs of the pulse width modulation signal and the inverted pulse width modulation signal to low levels.

[0173] When the connection state of the compensation inductor L C is determined to be abnormal, the controller sets a fault register according to the specific abnormal connection state, so as to facilitate reading information through the SMbus bus. At the same time, the controller also sets the outputs of the pulse width modulation signal and the inverted pulse width modulation signal to low levels, so as to cut off the TLVR circuit and avoid invalid operation or component damage of the TLVR circuit.

[0174] In particular, according to the embodiments of the present application, the processes described above with reference to the flowcharts can be implemented as a computer software program. For example, the embodiments of the present application include a computer program product comprising a computer program loaded on a computer readable medium, the computer program containing program code for executing the method shown in the flowchart. In such embodiments, the computer program can be downloaded and installed from a network through a communication device, or installed from a memory, or installed from a ROM. When the computer program is executed by an external processor, the above-mentioned functions defined in the method of the embodiments of the present application are executed.

[0175] It should be noted that the computer readable medium in the embodiments of the present application can be a computer readable signal medium or a computer readable storage medium or any combination of the two. The computer readable storage medium may, for example, but is not limited to, an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, device or apparatus, or any combination of the above. More specific examples of the computer readable storage medium can include, but are not limited to, an electrical connection having one or more wires, a portable computer diskette, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disk read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the above. In the embodiments of the present application, the computer readable storage medium can be any tangible medium containing or storing a program that can be used by or in conjunction with an instruction execution system, device or apparatus. In the embodiments of the present application, the computer readable signal medium can include a data signal carried in a baseband or as a part of a carrier wave, which carries computer readable program code. Such a propagated data signal can take many forms, including but not limited to an electromagnetic signal, an optical signal or any suitable combination of the above. The computer readable signal medium can also be any computer readable medium other than the computer readable storage medium, which can send, propagate or transmit a program for use by or in conjunction with an instruction execution system, device or apparatus. The program code contained in the computer readable medium can be transmitted by any suitable medium, including but not limited to a wire, an optical fiber, an RF (Radio Frequency, RF) or the like, or any suitable combination of the above.

[0176] The computer readable medium described above can be contained in the server described above; or can exist separately and not be assembled into the server. The computer readable medium described above carries one or more programs, when the one or more programs are executed by the server, the server: in response to detecting that the peripheral mode of the terminal is not activated, acquires the frame rate of the application on the terminal; when the frame rate meets the off-screen condition, judges whether the user is acquiring the screen information of the terminal; in response to the judgment result that the user is not acquiring the screen information of the terminal, controls the screen to enter the immediate dim mode.

[0177] Computer program code for carrying out operations of embodiments of the present application can be written in any combination of one or more programming languages, including an object oriented programming language such as Java, Smalltalk, C++ or the like, and conventional procedural programming languages, such as the "C" programming language or similar programming languages. The program code can execute entirely on the user's computer, partly on the user's computer, as a stand-alone software package, partly on the user's computer and partly on a remote computer or entirely on the remote computer or server. In the latter scenario, the remote computer can be connected to the user's computer through any type of network, including a local area network (LAN) or a wide area network (WAN), or the connection can be made to an external computer (for example, through the Internet using an Internet Service Provider).

[0178] The various embodiments in the specification are described progressively, and the same or similar parts among the various embodiments can be mutually referred to. Each embodiment focuses on the difference from other embodiments. In particular, the system or system embodiments are described more simply because they are basically similar to the method embodiments, and the relevant parts can be referred to the part of the method embodiments. The above described system and system embodiments are merely illustrative, and the units described as separate components can or can not be physically separated, and the components shown as units can or can not be physical units, i.e., they can be located in one place or distributed on multiple network units. Some or all of the modules can be selected to achieve the purpose of the embodiments according to actual needs. Those skilled in the art can understand and implement without creative labor.

[0179] The above describes the technical solutions provided by the present application in detail, and the principles and implementation manners of the present application are described by applying specific examples. The above embodiment descriptions are only used to help understand the method and core idea of the present application; at the same time, for those skilled in the art, according to the idea of the present application, the specific implementation manner and application range can be changed. In summary, the content of the specification should not be understood as a limitation of the present application.

[0180] The above only describes the preferred embodiments of the present application, and is not intended to limit the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. An inductance connection detection circuit for detecting the connection state of a compensation inductance in a TLVR circuit, the TLVR circuit comprising: The compensation inductance has one end electrically connected with the secondary coil in the TLVR circuit and the other end grounded, and the controller is configured to provide a driving signal to the TLVR circuit, characterized in that the inductance connection detection circuit comprises a voltage sampling module, a differential amplification module and a voltage calculation module. The voltage sampling module comprises a first sampling port, a second sampling port and a third sampling port. The differential amplification module comprises a first amplification port, a second amplification port, a third amplification port and a fourth amplification port. The voltage calculation module comprises a first calculation port and a second calculation port. The first sampling port is electrically connected with one end of the compensation inductance, the second sampling port is electrically connected with the other end of the compensation inductance, the third sampling port is electrically connected with the first amplification port, the second amplification port is electrically connected with the second sampling port, the third amplification port is electrically connected with the first calculation port, the fourth amplification port is grounded, and the second calculation port is electrically connected with the controller. The voltage calculation module is configured to calculate a voltage statistical value of the voltage of the third amplification port within a preset time period and output the voltage statistical value to the controller. The voltage sampling module comprises a capacitor and a first resistor. One end of the capacitor serves as the first sampling port, the other end of the capacitor is electrically connected with one end of the first resistor and serves as the third sampling port, and the other end of the first resistor is grounded. The differential amplification module comprises an operational amplifier, a second resistor, a third resistor, a fourth resistor and a fifth resistor.

2. The inductive connection detection circuit of claim 1, wherein, The operational amplifier comprises a non-inverting input end, an inverting input end and an operational amplifier output end.

3. The inductive connection detection circuit of claim 1, wherein, The first resistor has a resistance value greater than a preset resistance value, and the preset resistance value is expressed as: wherein, is a voltage across the first resistor.

4. An inductance connection detection method for detecting the connection state of a compensation inductance in a TLVR circuit by the inductance connection detection circuit according to any one of claims 1 to 3, characterized by The non-inverting input end is connected in series with the second resistor and serves as the first amplification port, the non-inverting input end is also connected in series with the fourth resistor and grounded, the inverting input end is connected in series with the third resistor and serves as the second amplification port, the inverting input end is also electrically connected with one end of the fifth resistor, and the other end of the fifth resistor is electrically connected with the operational amplifier output end. The voltage statistical value comprises a peak voltage, a voltage effective value or a voltage root-mean-square value. The method comprises: sending a pulse signal with a preset time period to any phase circuit; 5. The method of claim 4, wherein the step of detecting the inductive connection comprises: obtaining a voltage statistical value calculated by a voltage calculation module within the preset time period; judging a connection state of the compensation inductance according to the voltage statistical value and a preset voltage value, wherein the preset voltage value represents the voltage statistical value when the compensation inductance is normally connected. The judging of the connection state of the compensation inductance according to the voltage statistical value and the preset voltage value comprises:

6. The method of claim 5, wherein the step of detecting the inductive connection comprises: if the voltage statistical value is equal to the preset voltage value, determining that the connection state of the compensation inductance is normal; if the voltage statistical value is not equal to the preset voltage value, determining that the connection state of the compensation inductance is abnormal and judging an abnormal connection condition of the compensation inductance. The judging of the abnormal connection condition of the compensation inductance comprises: if the voltage statistical value is equal to 0, determining that the compensation inductance is open.

7. The method of claim 5, wherein the step of detecting the inductive connection comprises: The method further comprises: If the voltage statistical value exceeds 1.3 times of the preset voltage threshold value, it is determined that the compensation inductor is short-circuited.

8. The method of claim 4, wherein the method further comprises: The method further comprises: if it is determined that the connection state of the compensation inductor is abnormal, setting a fault register according to the abnormal connection state, and setting outputs of the pulse width modulation signal and the inverted pulse width modulation signal to low levels.

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