Resonant power supply, primary side feedback excitation power supply controller and method, and control device

Abstract

The embodiment of the present application provides a resonant power supply, a primary feedback excitation power supply controller and method, and a control device, which relate to the field of power supply technology and are used to simplify the secondary circuit of the rotary transformer in the process of controlling the current and voltage output by the rotary transformer. In the resonant power supply, the bridge circuit is electrically connected to the power supply, and the bridge circuit is used to convert the direct current provided by the power supply into a square wave signal according to the drive signal. The LC series resonant network is electrically connected to the bridge circuit and the primary winding, and the LC series resonant network is used to convert the square wave signal into alternating current and output it to the primary winding. The alternating current includes an input voltage V t and input current I r The rectifier bridge is electrically connected to the secondary winding and is used to convert the AC power on the secondary winding into DC power. The primary feedback excitation power supply controller is used to receive the input voltage V t and input current I r and outputs the above driving signal to the bridge circuit.

Description

Technical Field

[0001] The present application relates to the field of power supply technology, and in particular to a resonant power supply, a primary-side feedback excitation power supply controller and method, and a control device. Background Art

[0002] Currently, electric motors are widely used in the electronics and automation equipment industries. In brushless electrically excited synchronous motors, field windings replace permanent magnets to provide a constant magnetic field on the rotating shaft, thereby improving motor efficiency at high speeds and reducing reliance on rare earth elements. Furthermore, these brushless electrically excited synchronous motors use a rotary transformer instead of slip rings to power the field windings.

[0003] To control the output characteristics of a brushless electrically excited synchronous motor, such as speed and output power, the current and voltage output by the resolver can be collected to control the circuit electrically connected to the primary side of the resolver, achieving closed-loop control of the resolver's output electrical signal. However, the resolver's secondary side is connected to the excitation winding and therefore operates at high speed along with the excitation winding. This requires the addition of a large number of detection and communication circuits to the resolver's secondary side, resulting in a large number of components and a more complex circuit. During high-speed rotation, the resolver's secondary circuit generates significant centrifugal force. This centrifugal force, along with the heat generated by the rotating shaft and the motor body, can affect the reliability of the resolver's secondary circuit. Summary of the Invention

[0004] The present application provides a resonant power supply, a primary-side feedback excitation power supply controller method, and a control device for simplifying the secondary circuit of a rotary transformer during the process of controlling the current and voltage output by the rotary transformer.

[0005] To achieve the above objectives, this application adopts the following technical solutions:

[0006] In one aspect of the present application, a resonant power supply is provided. The resonant power supply includes a transformer, a bridge circuit, an LC series resonant network, a rectifier bridge, and a primary feedback excitation power supply controller. The transformer includes a primary winding and a secondary winding. The bridge circuit is electrically connected to the power supply, and the bridge circuit is used to convert the direct current provided by the power supply into a square wave signal according to a drive signal. The LC series resonant network is electrically connected to the bridge circuit and the primary winding, and the LC series resonant network is used to convert the square wave signal into alternating current and output it to the primary winding. The alternating current includes an input voltage V t and input current I r The rectifier bridge is electrically connected to the secondary winding, and is used to convert the AC power on the secondary winding into DC power. The primary feedback excitation power supply controller is electrically connected to the primary winding, the bridge circuit and the LC series resonant network. The primary feedback excitation power supply controller is used to receive the input voltage V tand input current I r And output the above drive signal to the bridge circuit. This drive signal can be used to drive the rectifier bridge to convert the AC power on the secondary winding into DC power. In this way, on the one hand, the primary feedback excitation power supply controller can receive the input voltage V t and input current I r The primary-side feedback excitation power supply controller is electrically connected to the primary winding, simplifying the structure of the secondary circuit in the transformer and preventing the primary-side feedback excitation power supply controller from being affected by high eccentricity and high temperature when the primary-side feedback excitation power supply controller rotates at high speed along with the shaft.

[0007] Optionally, the primary feedback excitation power supply controller is used to receive the input voltage V t and input current I r The primary feedback excitation power supply controller is used to calculate the excitation inductance L. m.est , according to the input voltage V t 、Input current I r , leakage inductance L of the primary winding lk1 And the calculated excitation inductance L m.est , calculate the output voltage V of the resonant power supply o.est and output current I o.est And output the driving signal to the bridge circuit. In this way, the output voltage V of the resonant power supply can be calculated through the above primary feedback excitation power supply controller. o.est and output current I o.est , to achieve the purpose of controlling the output characteristics of the brushless electric excitation synchronous motor, such as speed and output power. On the other hand, the primary feedback excitation power supply controller can control the output voltage V o.est and output current I o.est Output a drive signal to the bridge circuit to perform closed-loop control on the bridge circuit and adjust the frequency and duty cycle of the bridge circuit output signal to match the target value.

[0008] Optionally, the primary feedback excitation power supply controller includes a sampling circuit, a feedback circuit and a primary control circuit. It is electrically connected to the primary winding, and the sampling circuit is used to collect the input voltage V t and input current I r The feedback circuit is electrically connected to the acquisition circuit and is used to generate a signal according to the input voltage V t 、Input current I r , leakage inductance L of the primary winding lk1 And the calculated excitation inductance L m.est , calculate the excitation voltage Vm.est , excitation current I m.est and the primary current I pri.est , and according to the calculated excitation voltage V m.est , primary current I pri.est Calculate the output voltage V of the resonant power supply o.est and output current I o.est .

[0009] in,

[0010]

[0011] I pri.est =I r -I m.est ;

[0012] In addition, the primary control circuit is electrically connected to the feedback circuit and the bridge circuit to calculate the excitation inductance L m.est and the leakage inductance L of the primary winding lk1 And calculate the excitation inductance L m.est Transmitted to the feedback circuit. Due to the excitation current I m.est And the primary current I pri.est and the calculated excitation inductance L m.est Regarding the actual excitation inductance L m The value of will change greatly with the change of air gap distance, thus changing with the calculated excitation inductance L. m.est Therefore, the excitation inductance L can be calculated as needed through the above primary side control circuit. m.est , to the excitation inductance L m.est Perform real-time correction so that the primary current I calculated by the feedback circuit is pri.est and the excitation inductance L m.est The value of is more accurate. This is conducive to improving the final calculated resonant power supply output voltage V o.est and output current I o.est Accuracy.

[0013] Optionally, the resonant inductor value in the LC series resonant network is L r , the capacitance of the resonant capacitor is C r The primary control circuit is also used to calculate the oscillation frequency f of the bridge circuit. r .

[0014] in,

[0015] The primary side control circuit is used to calculate the excitation inductance L m.est Including: the primary side control circuit is used to adjust the operating frequency f of the bridge circuit sw and oscillation frequency fr For comparison, when f sw <f r At the acquisition phase T in the switching cycle T of the bridge circuit cal The absolute value of the excitation current calculated by the feedback circuit during the current switching cycle T of the bridge circuit |I m.est |With the absolute value of the input current|I r |Compare; when |I m.est |>|I r |When the bridge circuit is in the current switching cycle T, the excitation inductance L received by the feedback circuit m.est Increase, so that |I m.est |=|I r |, and output to the feedback circuit. In this way, when the primary side controller determines |I m.est |>|I r |When the primary side controller can increase the excitation inductance L received by the feedback circuit in the current switching cycle T of the bridge circuit, m.est , so that the excitation current I calculated by the feedback circuit m.est The actual excitation current I m.true the same or approximately the same, so that |I m.est |=|I r |. This makes the primary current I calculated by the feedback circuit pri.est is zero, which is consistent with the actual primary current I pri In addition, when |I m.est |<|I r |When the bridge circuit is in the current switching cycle T, the excitation inductance L received by the feedback circuit m.est Reduce, so that |I m.est |=|I r |, and output to the feedback circuit. In this way, when the primary side controller determines |I m.est |<|I r |When the primary side controller can reduce the excitation inductance L received by the feedback circuit in the current switching cycle T of the bridge circuit, m.est , so that the primary current I calculated by the feedback circuit pri.est is zero, which is consistent with the actual primary current I pri Same. When |I m.est |=|I r |When the bridge circuit is in the current switching cycle T, the excitation inductance L received by the feedback circuit m.est Output to the feedback circuit; where T cal =T / 2-T f / 2, T f =1 / f r In this way, when the primary controller determines that |I m.est |=|Ir |When the primary current I pri.est is zero, which is consistent with the actual primary current I pri At this time, the excitation inductance L calculated by the primary controller is m.est The same or approximately the same as the actual excitation inductance, so the primary side controller can provide the excitation inductance L last provided to the feedback circuit. m.est Output to the feedback circuit again to achieve the excitation inductance L m.est The purpose of the revision.

[0016] Optionally, the primary side control circuit is used to calculate the magnetizing inductance L m.est Including: the primary side control circuit is used to judge the primary side current I calculated by the feedback circuit pri.est When it is zero, the excitation inductance L received by the feedback circuit in the current switching cycle T of the bridge circuit is m.est Output to the feedback circuit. In this way, when the primary controller determines the primary current I pri.est is zero, which is consistent with the actual primary current I pri At this time, the excitation inductance L calculated by the primary controller is m.est The same or approximately the same as the actual excitation inductance, so the primary side controller can provide the excitation inductance L last provided to the feedback circuit. m.est Output to the feedback circuit again to achieve the excitation inductance L m.est The purpose of the revision.

[0017] Optionally, the feedback circuit includes: a voltage operation circuit, a current operation circuit and an output voltage and current operation circuit. The voltage operation circuit is electrically connected to the acquisition circuit and the primary control circuit, and is used to generate an output voltage according to the input voltage V t 、Input current I r And the leakage inductance L of the primary winding provided by the primary control circuit lk1 Calculate the excitation voltage V m.est The current operation circuit is electrically connected to the voltage operation circuit and the primary control circuit, and is used to adjust the current according to the excitation voltage V m.est And the excitation inductance L calculated by the primary control circuit m.est , calculate the excitation current I m.est and the primary current I pri.est The output voltage and current calculation circuit is electrically connected to the voltage calculation circuit, the current calculation circuit and the primary control circuit, and is used to adjust the excitation voltage V m.est , primary current I pri.est Calculate the output voltage V of the resonant power supply o.est and output current I o.est In this way, the excitation voltage V can be calculated through the voltage operation circuit. m.est, the excitation current I can be calculated through the current operation circuit m.est and the primary current I pri.est The output voltage V can be calculated by the output voltage and current operation circuit. o.est and output current I o.est .

[0018] Optionally, the voltage operation circuit includes a differentiator, a first operational amplifier, and a second operational amplifier. The differentiator is electrically connected to the acquisition circuit to obtain the input current I r The first operational amplifier is electrically connected to the differentiator and the primary control circuit, and the input current I r The rate of change is related to the leakage inductance L of the primary winding lk1 Multiply to get L lk1 ×(dI r / dt). The second operational amplifier is electrically connected to the first operational amplifier and the acquisition circuit, and is used to calculate the input voltage V t With the first operational amplifier output L lk1 ×(dI r / dt) is used as the excitation voltage V m.est The function of the voltage operational circuit can be realized by hardware electronic components such as a differentiator, a first operational amplifier, and a second operational amplifier.

[0019] Optionally, the current operation circuit includes a third operational amplifier, an integrator, and a fourth operational amplifier. The third operational amplifier is electrically connected to the second operational amplifier and the primary control circuit, and is used to obtain the excitation inductance L calculated by the primary control circuit. m.est The reciprocal of the excitation voltage V m.est The integrator is electrically connected to the third operational amplifier for the excitation voltage V m.est Integrate and get the excitation current I m.est The fourth operational amplifier is electrically connected to the integrator and the acquisition circuit and is used to calculate the input current Ir and the excitation current I m.est The difference between the two is used as the primary current I pri.est In this way, the function of the current operation circuit can be realized by the hardware electronic components including the third operational amplifier, the integrator and the fourth operational amplifier.

[0020] Optionally, the output voltage and current operation circuit includes: a fifth operational amplifier, a first low-pass filter, a sixth operational amplifier, a second low-pass filter and an operation processing circuit. The fifth operational amplifier is electrically connected to the second operational amplifier and is used to calculate the excitation voltage V m.est The absolute value of V m.est The first low-pass filter is electrically connected to the fifth operational amplifier and is used to calculate the excitation voltage V m.estThe average value of the absolute value of V m.est | avg The sixth operational amplifier is electrically connected to the fourth operational amplifier and is used to calculate the primary current I pri.est The absolute value of |I pri.est The second low-pass filter is electrically connected to the sixth operational amplifier and is used to calculate the primary current I pri.est The average of the absolute values ​​of |I pri.est | avg The operation processing circuit is electrically connected to the fifth operational amplifier, the first low-pass filter, the sixth operational amplifier and the second low-pass filter. sw ≥f r The operation processing circuit is used to calculate the excitation voltage V within a switching cycle T of the bridge circuit. m.est Average value of absolute value|V m.est | avg , primary current I pri.est Average of absolute values ​​|I pri.est | avg , and the turns ratio K of the primary winding and the secondary winding, calculate the output voltage V of the resonant power supply o.est and output current I o.est .

[0021] in,

[0022] When the primary control circuit determines that f sw <f r The operation processing circuit is used to obtain the current I from multiple primary currents within half a switching cycle T of the bridge circuit. pri.est The absolute value of |I pri.est |The primary current I is obtained from pri.est Peak value of absolute value|I pri.est | max , and the peak value |I pri.est | max Match the absolute value of the excitation voltage |V m1 |, and according to the primary current I pri.est Average of absolute values ​​|I pri.est | avg , and the turns ratio K of the primary winding and the secondary winding of the transformer, calculate the output voltage V of the resonant power supply o.est and output current I o.est .

[0023] in,

[0024] In this way, the function of the output voltage and current operation circuit can be realized by the hardware electronic components such as the fifth operational amplifier, the first low-pass filter, the sixth operational amplifier, the second low-pass filter and the operation processing circuit. In addition, by adjusting the oscillation frequency f of the bridge circuit r The operating frequency f of the bridge circuit sw Compare and calculate the output voltage V of the resonant power supply in different ways according to different comparison results. o.est and output current I o.est , you can reduce the calculated output voltage V o.est and output current I o.est error, achieving high-precision primary-side feedback.

[0025] Another aspect of the present application provides a primary-side feedback excitation power supply controller. The primary-side feedback excitation power supply controller can be integrated into a chip. The primary-side feedback excitation power supply controller is electrically connected to the bridge circuit, LC series resonant network, and primary winding of the transformer in the resonant power supply. The primary-side feedback excitation power supply controller is used to receive an input voltage V provided by the LC series resonant network. t and input current I r and outputs a drive signal to the bridge circuit. The drive signal is used to drive the bridge circuit to convert the DC power provided by the power supply into a square wave signal. This primary-side feedback excitation power supply controller has the same technical effects as the resonant power supply provided in the previous embodiment and will not be described in detail here.

[0026] Optionally, the primary feedback excitation power supply controller is used to receive the input voltage V provided by the LC series resonant network t and input current I r The primary feedback excitation power supply controller is used to calculate the excitation inductance L. m.est , according to the input voltage V provided by the LC series resonant network t 、Input current I r , leakage inductance L of the primary winding lk1 And the calculated excitation inductance L m.est , calculate the output voltage V of the resonant power supply o.est and output current I o.est The primary feedback excitation power supply controller calculates the output voltage V of the resonant power supply o.est and output current I o.est The technical effects are the same as those of the above embodiments and will not be described again here.

[0027] Optionally, the primary feedback excitation power supply controller includes a sampling circuit, a feedback circuit and a primary control circuit. It is electrically connected to the primary winding, and the sampling circuit is used to collect the input voltage V t and input current I rThe feedback circuit is electrically connected to the acquisition circuit and is used to generate a signal according to the input voltage V t 、Input current I r , leakage inductance L of the primary winding lk1 And the calculated excitation inductance L m.est , calculate the excitation voltage V m.est , excitation current I m.est and the primary current I pri.est , and according to the calculated excitation voltage V m.est , primary current I pri.est Calculate the output voltage V of the resonant power supply o.est and output current I o.est .

[0028] in,

[0029]

[0030] I pri.est =I r -I m.est ;

[0031] In addition, the primary control circuit is electrically connected to the feedback circuit and the bridge circuit to calculate the excitation inductance L m.est and the leakage inductance L of the primary winding lk1 And calculate the excitation inductance L m.est The technical effects of the sampling circuit, feedback circuit, and primary-side control circuit are the same as those described above and will not be repeated here.

[0032] Optionally, the resonant inductor value in the LC series resonant network is L r , the capacitance of the resonant capacitor is C r The primary control circuit is also used to calculate the oscillation frequency f of the bridge circuit. r .

[0033] in,

[0034] The primary side control circuit is used to calculate the excitation inductance L m.est Including: the primary side control circuit is used to adjust the operating frequency f of the bridge circuit sw and oscillation frequency f r For comparison, when f sw <f r At the acquisition phase T in the switching cycle T of the bridge circuit cal The absolute value of the excitation current calculated by the feedback circuit during the current switching cycle T of the bridge circuit |I m.est |With the absolute value of the input current|I r |Compare; when |I m.est |>|Ir |When the bridge circuit is in the current switching cycle T, the excitation inductance L received by the feedback circuit m.est Increase, so that |I m.est |=|I r |, and output to the feedback circuit. In addition, when |I m.est |<|I r |When the bridge circuit is in the current switching cycle T, the excitation inductance L received by the feedback circuit m.est Reduce, so that |I m.est |=|I r |, and output to the feedback circuit. m.est |=|I r |When the bridge circuit is in the current switching cycle T, the excitation inductance L received by the feedback circuit m.est Output to the feedback circuit; where T cal =T / 2-T f / 2, T f =1 / f r . For the excitation inductance L m.est The technical effects of the correction process are the same as described above and will not be repeated here.

[0035] Optionally, the primary side control circuit is used to calculate the magnetizing inductance L m.est Including: the primary side control circuit is used to judge the primary side current I calculated by the feedback circuit pri.est When it is zero, the excitation inductance L received by the feedback circuit in the current switching cycle T of the bridge circuit is m.est Output to the feedback circuit. For the excitation inductance L m.est The technical effects of the correction process are the same as described above and will not be repeated here.

[0036] Optionally, the feedback circuit includes: a voltage operation circuit, a current operation circuit and an output voltage and current operation circuit. The voltage operation circuit is electrically connected to the acquisition circuit and the primary control circuit, and is used to generate an output voltage according to the input voltage V t 、Input current I r And the leakage inductance L of the primary winding provided by the primary control circuit lk1 Calculate the excitation voltage V m.est The current operation circuit is electrically connected to the voltage operation circuit and the primary control circuit, and is used to adjust the current according to the excitation voltage V m.est And the excitation inductance L calculated by the primary control circuit m.est , calculate the excitation current I m.est and the primary current I pri.est The output voltage and current calculation circuit is electrically connected to the voltage calculation circuit, the current calculation circuit and the primary control circuit, and is used to adjust the excitation voltage V m.est , primary current I pri.est Calculate the output voltage V of the resonant power supplyo.est and output current I o.est The technical effects of the voltage operation circuit, the current operation circuit, and the output voltage and current operation circuit are the same as those described above and will not be repeated here.

[0037] Optionally, the voltage operation circuit includes a differentiator, a first operational amplifier, and a second operational amplifier. The differentiator is electrically connected to the acquisition circuit to obtain the input current I r The first operational amplifier is electrically connected to the differentiator and the primary control circuit, and the input current I r The rate of change is related to the leakage inductance L of the primary winding lk1 Multiply to get L lk1 ×(dI r / dt). The second operational amplifier is electrically connected to the first operational amplifier and the acquisition circuit, and is used to calculate the input voltage V t With the first operational amplifier output L lk1 ×(dI r / dt) is used as the excitation voltage V m.est The function of the voltage operational circuit can be realized by hardware electronic components such as a differentiator, a first operational amplifier, and a second operational amplifier.

[0038] Optionally, the current operation circuit includes a third operational amplifier, an integrator, and a fourth operational amplifier. The third operational amplifier is electrically connected to the second operational amplifier and the primary control circuit, and is used to obtain the excitation inductance L calculated by the primary control circuit. m.est The reciprocal of the excitation voltage V m.est The integrator is electrically connected to the third operational amplifier for the excitation voltage V m.est Integrate and get the excitation current I m.est The fourth operational amplifier is electrically connected to the integrator and the acquisition circuit and is used to calculate the input current Ir and the excitation current I m.est The difference between the two is used as the primary current I pri.est In this way, the function of the current operation circuit can be realized by the hardware electronic components including the third operational amplifier, the integrator and the fourth operational amplifier.

[0039] Optionally, the output voltage and current operation circuit includes: a fifth operational amplifier, a first low-pass filter, a sixth operational amplifier, a second low-pass filter and an operation processing circuit. The fifth operational amplifier is electrically connected to the second operational amplifier and is used to calculate the excitation voltage V m.est The absolute value of V m.est The first low-pass filter is electrically connected to the fifth operational amplifier and is used to calculate the excitation voltage V m.est The average value of the absolute value of V m.est |avg The sixth operational amplifier is electrically connected to the fourth operational amplifier and is used to calculate the primary current I pri.est The absolute value of |I pri.est The second low-pass filter is electrically connected to the sixth operational amplifier and is used to calculate the primary current I pri.est The average of the absolute values ​​of |I pri.est | avg The operation processing circuit is electrically connected to the fifth operational amplifier, the first low-pass filter, the sixth operational amplifier and the second low-pass filter. sw ≥f r The operation processing circuit is used to calculate the excitation voltage V within a switching cycle T of the bridge circuit. m.est Average value of absolute value|V m.est | avg , primary current I pri.est Average of absolute values ​​|I pri.est | avg , and the turns ratio K of the primary winding and the secondary winding, calculate the output voltage V of the resonant power supply o.est and output current I o.est .

[0040] in,

[0041] When the primary control circuit determines that f sw <f r The operation processing circuit is used to obtain the current I from multiple primary currents within half a switching cycle T of the bridge circuit. pri.est The absolute value of |I pri.est |The primary current I is obtained from pri.est Peak value of absolute value|I pri.est | max , and the peak value |I pri.est | max Match the absolute value of the excitation voltage |V m1 |, and according to the primary current I pri.est Average of absolute values ​​|I pri.est | avg , and the turns ratio K of the primary winding and the secondary winding of the transformer, calculate the output voltage V of the resonant power supply o.est and output current I o.est .

[0042] in,

[0043] In this way, the function of the output voltage and current operation circuit can be realized by the hardware electronic components such as the fifth operational amplifier, the first low-pass filter, the sixth operational amplifier, the second low-pass filter and the operation processing circuit. In addition, by adjusting the oscillation frequency f of the bridge circuit r The operating frequency f of the bridge circuit sw Compare and calculate the output voltage V of the resonant power supply in different ways according to different comparison results. o.est and output current I o.est , you can reduce the calculated output voltage V o.est and output current I o.est error, achieving high-precision primary-side feedback.

[0044] Another aspect of the present application provides a control method for any of the above-mentioned feedback excitation power supply controllers. The control method includes: calculating the excitation inductance L m.est , according to the input voltage Vt, input current I r , leakage inductance L of the primary winding lk1 And the calculated excitation inductance L m.est , calculate the output voltage V of the resonant power supply o.est and output current I o.est The control method of the resonant power supply has the same technical effect as the resonant power supply provided by the above embodiment, and will not be described in detail here.

[0045] Optional, according to the input voltage Vt, input current I r , leakage inductance L of the primary winding lk1 And the excitation inductance L m.est , calculate the output voltage V o.est and output current I o.est Including: collecting input voltage V t and input current I r Next, calculate the magnetizing inductance L m.est and the leakage inductance L of the primary winding lk1 And calculate the excitation inductance L m.est Then, according to the input voltage V t 、Input current I r , leakage inductance L of the primary winding lk1 And the calculated excitation inductance L m.est , calculate the excitation voltage V m.est , excitation current I m.est and the primary current I pri.est ;

[0046] in,

[0047]

[0048] I pri.est =I r -I m.est ;

[0049] Next, according to the calculated excitation voltage V m.est , primary current I pri.est Calculate the output voltage V of the resonant power supply o.est and output current I o.est Since the excitation current I m.est And the primary current I pri.est and the calculated excitation inductance L m.est Regarding the actual excitation inductance L m The value of will change greatly with the change of air gap distance, thus changing with the calculated excitation inductance L. m.est Therefore, the excitation inductance L can be calculated as needed through the above primary side control circuit. m.est , to the excitation inductance L m.est Perform real-time correction so that the primary current I calculated by the feedback circuit is pri.est and the excitation inductance L m.est The value of is more accurate. This is conducive to improving the final calculated resonant power supply output voltage V o.est and output current I o.est Accuracy.

[0050] Optionally, the resonant inductor value in the LC series resonant network is L r , the capacitance of the resonant capacitor is C r The above control method also includes: calculating the oscillation frequency f of the bridge circuit r .

[0051] in,

[0052] The calculation of the excitation inductance L m.est Including: the operating frequency f of the bridge circuit sw and oscillation frequency f r For comparison, when f sw <f r When the bridge circuit switches in the switching cycle T, the phase T cal The absolute value of the excitation current calculated by the feedback circuit during the current switching cycle T of the bridge circuit |I m.est |With the absolute value of the input current|I r |Compare. When |I m.est |>|I r |When the bridge circuit is in the current switching cycle T, the excitation inductance L received by the feedback circuit m.estIncrease, so that |I m.est |=|I r |, and output to the feedback circuit. m.est |<|I r |When the bridge circuit is in the current switching cycle T, the excitation inductance L received by the feedback circuit m.est Reduce, so that |I m.est |=|I r |, and output to the feedback circuit. m.est |=|I r |When the bridge circuit is in the current switching cycle T, the excitation inductance L received by the feedback circuit m.est Output to the feedback circuit. Among them, T cal =T / 2-T f / 2, T f =1 / f r . For the excitation inductance L m.est The technical effects of the correction process are the same as described above and will not be repeated here.

[0053] Optionally, calculate the magnetizing inductance L m.est Including: judging the primary current I calculated by the feedback circuit pri.est When it is zero, the excitation inductance L received by the feedback circuit in the current switching cycle T of the bridge circuit is m.est Output to the feedback circuit to obtain the excitation inductance L m.est The technical effect of the correction value is the same as described above and will not be repeated here.

[0054] Optional, when f sw ≥f r When the excitation voltage V is calculated m.est , primary current I pri.est Calculate the output voltage V of the resonant power supply o.est and output current I o.est Including: Calculate the excitation voltage V within one switching cycle T of the bridge circuit m.est Average value of absolute value|V m.est | avg , primary current I pri.est Average of absolute values ​​|I pri.est | avg . And according to the excitation voltage V m.est Average value of absolute value|V m.est | avg , primary current I pri.est Average of absolute values ​​|I pri.est | avg , and the turns ratio K of the primary winding and the secondary winding of the transformer, calculate the output voltage V of the resonant power supply o.est and output current I o.est .

[0055] in,

[0056] When f sw ≥f r When the excitation voltage V m.est The average value of V m. | avg And the primary current I pri.est The average value of I pri.est | avg , calculate the output voltage V o.est and output current I o.est The technical effects are the same as above and will not be described again here.

[0057] Optional, when f sw <f r When the excitation voltage V is calculated m.est , primary current I pri.est Calculate the output voltage V of the resonant power supply o.est and output current I o.est Including: Calculate the primary current I within one switching cycle T of the bridge circuit pri.est Average of absolute values ​​|I pri.est | avg , and continuously obtain multiple excitation voltages V in half a switching cycle T m.est The absolute value of V m.est | and multiple primary currents I pri.est The absolute value of |I pri.est |. From multiple primary currents I pri.est The absolute value of |I pri.est |, the primary current I pri.est Peak absolute value |I pri.est | max , and the peak value |I pri.est | max Match the absolute value of the excitation voltage |V m1 |. According to the primary current I pri.est Peak absolute value |I pri.est | max , and the peak value |I pri.est | max Match the absolute value of the excitation voltage |V m1 |, primary current I pri Average of absolute values ​​|I pri | avg And the turns ratio K of the transformer primary winding and secondary winding, calculate the output voltage V o.est and output current I o.est .

[0058] in,

[0059] When f sw <f r When the peak value|I pri.est | max Match the absolute value of the excitation voltage |V m1 | and the primary current I pri.est Average of absolute values ​​|I pri | avg , calculate the output voltage V o.est and output current I o.est The technical effects are the same as above and will not be described again here.

[0060] Another aspect of the present application provides a control device, comprising a load and any of the resonant power supplies described above, the resonant power supply being electrically connected to the load. The control device has the same technical effects as the resonant power supply provided in the aforementioned embodiment, and will not be described in detail here.

[0061] Optionally, the load includes an electric excitation winding. The control device also includes a rotating shaft and an armature winding. The rotating shaft is connected to the electric excitation winding. The armature winding is electrically connected to the electric excitation winding and the primary feedback excitation power supply controller in the resonant power supply to generate a rotating magnetic field to drive the rotating shaft to rotate. The armature winding is also used to generate an output voltage V of the resonant power supply calculated by the primary feedback excitation power supply controller. o.est and output current I o.est , as well as the output voltage and output current of the resonant power supply preset in the primary feedback excitation power supply controller, to control the primary feedback excitation power supply controller to output a drive signal. In this way, the primary feedback excitation power supply controller in the resonant power supply is electrically connected to the primary winding of the transformer and does not rotate with the rotation of the shaft in the brushless electric excitation synchronous motor. This improves calculation accuracy while simplifying the structure of the secondary circuit in the transformer that rotates with the shaft, and reduces the probability of device failure due to high-speed rotation of the shaft.

[0062] Another aspect of the present application provides a computer-readable storage medium comprising computer instructions. When executed on a primary-side feedback excitation power supply controller, the computer-readable storage medium causes the primary-side feedback excitation power supply controller to perform any of the control methods described above. This computer-readable storage medium has the same technical effects as the primary-side feedback excitation power supply controller provided in the aforementioned embodiments and is not further described here.

[0063] Another aspect of the present application provides a computer program product comprising computer instructions. When executed on a primary-side feedback excitation power supply controller in a control device, the computer program product causes the primary-side feedback excitation power supply controller to perform any of the control methods described above. This computer program product has the same technical effects as the primary-side feedback excitation power supply controller provided in the aforementioned embodiments and is not further described here. BRIEF DESCRIPTION OF THE DRAWINGS

[0064] Figure 1A A schematic structural diagram of another control device provided in an embodiment of the present application;

[0065] Figure 1B A schematic diagram of a square wave signal output by a bridge circuit provided in an embodiment of the present application;

[0066] Figure 2 A schematic structural diagram of another control device provided in an embodiment of the present application;

[0067] Figure 3 A schematic structural diagram of another control device provided in an embodiment of the present application;

[0068] Figure 4 A flow chart of a control method for a control device provided in an embodiment of the present application;

[0069] Figure 5 for Figure 4 Schematic diagram of the specific steps of S101;

[0070] Figure 6 A schematic structural diagram of another control device provided in an embodiment of the present application;

[0071] Figure 7 A schematic structural diagram of another control device provided in an embodiment of the present application;

[0072] Figure 8 for Figure 7 A structural diagram of a medium voltage operation circuit;

[0073] Figure 9 for Figure 7 A schematic diagram of the structure of the voltage operation circuit and the current operation circuit;

[0074] Figure 10 Provides a waveform diagram of input current, calculated excitation current, and actual excitation current for the embodiment of the present application;

[0075] Figure 11 for Figure 5 Schematic diagram of the specific steps of S202;

[0076] Figure 12 for Figure 4Schematic diagram of the specific steps of S102;

[0077] Figure 13A Provides a waveform diagram of the excitation voltage, the voltage reflected by the output voltage to the primary side, and the primary side current for the embodiment of the present application;

[0078] Figure 13B Another waveform diagram of the excitation voltage and primary current is provided for the embodiment of the present application;

[0079] Figure 14 A schematic structural diagram of another control device provided in an embodiment of the present application;

[0080] Figure 15 An error waveform diagram of output voltage and output current provided in an embodiment of the present application;

[0081] Figure 16 This is an error waveform diagram of an output voltage provided in an embodiment of the present application.

[0082] Reference numerals:

[0083] 01-control device; 100-power supply; 10-resonant power supply; 11-transformer; 110-primary winding; 111-secondary winding; 20-load; 30-rectifier; 120-bridge circuit; 121-LC series resonant network; 40-primary feedback excitation power supply controller; 21-armature winding; 22-electric drive controller; 401-acquisition circuit; 402-feedback circuit; 403-primary control circuit; 412-voltage operation circuit; 422-current operation circuit; 432-output voltage and current operation circuit; 51-differentiator; 61-first operational amplifier; 62-second operational amplifier; 63-third operational amplifier; 64-fourth operational amplifier; 52-integrator; 65-fifth operational amplifier; 71-first low-pass filter; 66-sixth operational amplifier; 72-second low-pass filter; 70-operation processing circuit; 200-digital signal processor. DETAILED DESCRIPTION

[0084] The technical solutions in the embodiments of the present application will be described below in conjunction 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.

[0085] In the following, the terms "first," "second," etc. are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the quantity of the technical features indicated. Therefore, a feature specified as "first," "second," etc. may explicitly or implicitly include one or more of the features.

[0086] In this application, unless otherwise specified or limited, the term "connection" should be understood broadly. For example, "connection" can refer to fixed connection, detachable connection, or integration; it can refer to direct connection or indirect connection through an intermediate medium. In addition, the term "electrical connection" can refer to direct electrical connection or indirect electrical connection through an intermediate medium.

[0087] The embodiment of the present application provides a control device 01, such as Figure 1A As shown, the control device 01 may include a resonant power supply 10 and a load 20. The resonant power supply 10 is used to supply power to the load 20 to drive the load 20 to work. The resonant power supply 10 may include a transformer 11, a bridge circuit 120, an LC series resonant network 121, a rectifier 30, an output capacitor C o and a primary feedback excitation power supply controller 40. The transformer 11 includes a primary winding 110 and a secondary winding 111.

[0088] The bridge circuit 120 is electrically connected to the power supply 100. The bridge circuit 120 is used to convert the DC power provided by the power supply 100 into a DC power supply according to the drive signal Sd output by the primary feedback excitation power supply controller 40. Figure 1B The square wave signal V hb The LC series resonant network 121 is electrically connected to the bridge circuit 120 and the primary winding 110. In some embodiments of the present application, the bridge circuit 120 may be a full-bridge circuit or a half-bridge circuit. The bridge circuit 120 includes a plurality of metal oxide semiconductor (MOS) transistors. The LC series resonant network 121 may include a series resonant inductor Lr and a resonant capacitor Cr.

[0089] In this case, the bridge circuit 120 receives the driving signal Sd output by the primary feedback excitation power supply controller 40, which can control the duration of the on and off of the MOS transistors in the bridge circuit 120 (i.e., the switching frequency of the MOS transistors, hereinafter referred to as the operating frequency f of the bridge circuit 120). sw ), so that the bridge circuit 120 can convert the DC power of the power supply 100 into the above square wave signal V hb Therefore, the square wave signal V can be controlled by the above driving signal Sd. hb The frequency and duty cycle of Figure 1B As shown, the square wave signal V hb There are multiple switching cycles T, which are related to the switching frequency f of the MOS transistors in the bridge circuit 120. sw Between: f sw =1 / T.

[0090] In addition, the square wave signal V hbThe inductor L in the LC series resonant network 121 can be r and resonant capacitor C r The charge and discharge process of the inductor L r and resonant capacitor C r During the charging and discharging process, the LC series resonant network 121 can convert the square wave signal V hb The AC power output by the LC series resonant network 121 may include the input voltage V t and input current I r The waveform of this alternating current can be approximated as a sine wave.

[0091] Based on this, Figure 1A As shown, the input voltage V in the AC power output by the LC series resonant network 121 is t is applied to the primary winding 110 of the transformer 11, and the input current I r When the current flows through the primary winding 110 , a changing magnetic field is generated on the primary winding 110 , and the secondary winding 111 is induced to generate an alternating current in the magnetic field.

[0092] In addition, the rectifier 30 in the resonant power supply 10 is electrically connected between the secondary winding 111 and the load 20, and the output capacitor C o One end of the rectifier 30 and the load 20 are electrically connected, and the other end is grounded. The rectifier 30 can convert the AC power output by the secondary winding 111 into DC power and output it through the output capacitor C o The DC power output by the rectifier bridge 30 includes the actual output voltage V of the resonant power supply 10. o and output current I o .

[0093] like Figure 1A The transformer 11 shown is an ideal transformer model. However, during actual operation, not all magnetic lines of force in the magnetic field generated by the primary winding 110 pass through the secondary winding 111, resulting in leakage magnetic flux. Consequently, the inductance that generates leakage magnetic flux in the transformer 11 is called leakage inductance. Furthermore, the primary winding 110 has an initial inductance, which can be called the magnetizing inductance L. m .

[0094] In this case, the structure of the irrational transformer model of transformer 11 is as follows Figure 2 As shown, it can be seen that the transformer 11 also includes a leakage inductance L of the primary winding 110 lk1 , the leakage inductance L fed back from the secondary winding 111 to the primary side lk2 , and the excitation inductance L m Among them, the resonant inductor L rThe leakage inductance L of the primary winding 110 lk1 In series, the excitation inductance L m The leakage inductance L fed back to the primary side by the secondary winding 111 lk2 After being connected in parallel with the leakage inductance L of the primary winding 110 lk1 Series connection.

[0095] It should be noted that the leakage inductance L fed back from the secondary winding 111 to the primary side lk2 That is, when the number of turns of the primary winding 110 is N p , the number of turns of the secondary winding 111 is N s When the leakage inductance L of the secondary winding 111 is lk2 Calculate the leakage inductance L fed back from the secondary winding 111 to the primary side lk2 . L lk2 =L lk2 '×(N p / N s ) 2 .

[0096] In some embodiments of the present application, the control device 01 may be a brushless electrically excited synchronous motor. In this case, Figure 3 As shown, the excitation winding of the brushless electric excitation synchronous motor can be used as Figure 2 The load 20 is shown. In addition, the brushless electric excitation synchronous motor may further include an armature winding 21, an electric drive controller 22 and a rotating shaft (not shown in the figure).

[0097] The excitation winding, serving as the load 20, can be disposed on the rotating shaft. When the resonant power supply 10 supplies power to the excitation winding, a constant magnetic field is generated. The electric drive controller 22 is electrically connected to the armature winding 21. The electric drive controller 22 is capable of supplying power to the armature winding 21 and controlling the armature winding 21 to generate a rotating magnetic field that drives the rotating shaft. When the rotating shaft rotates, the excitation winding (i.e., the load 20), the rectifier 30, and the secondary winding 111 of the transformer 11 connected to the shaft, as the rotating components of the control device 01, rotate along with the shaft.

[0098] It should be noted that the electric drive controller 22 may be powered by a separate power supply, or may be powered by a common power supply 100 to which the bridge circuit 120 is electrically connected.

[0099] In order to control the output characteristics of brushless electric excitation synchronous motor, such as speed, output power, etc. Figure 3 As shown, the primary feedback excitation power supply controller 40 can be electrically connected to the primary winding 110, the bridge circuit 120 and the LC series resonant network 121. The primary feedback excitation power supply controller 40 can be used to receive the input voltage V t and input current Ir And output the driving signal Sd to the bridge circuit 120. The driving signal can be used to drive the bridge circuit 120 to convert the DC power of the power supply 100 into the square wave signal V hb . In this way, the primary feedback excitation power supply controller can perform closed-loop control on the bridge circuit 120, adjust the frequency and duty cycle of the output signal of the bridge circuit 120 to match the target value, thereby making the output voltage and output current of the resonant power supply 10 match the target value. In addition, the primary feedback excitation power supply controller 40 is electrically connected to the primary winding 110, which can simplify the structure of the secondary circuit in the transformer. Specifically, the primary feedback excitation power supply controller 40 can be used to calculate the excitation inductance L m.est , according to the input voltage Vt, input current I r , leakage inductance L of the primary winding lk1 And the calculated excitation inductance L m.est , calculate the output voltage V of the resonant power supply 10 o.est and output current I o.est and outputs the driving signal Sd to the bridge circuit 120.

[0100] It should be noted that, in the embodiment of the present application, the subscript of the parameter calculated by the primary feedback excitation power supply controller 40 is marked with “est”.

[0101] In addition, the electric drive controller 22 can also be electrically connected to the primary feedback excitation power supply controller 40. The electric drive controller 22 is used to output the output voltage and output current preset values ​​preset in the primary feedback excitation power supply controller 40, and the output voltage V of the resonant power supply 10 calculated by the primary feedback excitation power supply controller 40. o.est and output current I o.est , providing a control signal to the primary feedback excitation power supply controller 40 to control the drive signal Sd output by the primary feedback excitation power supply controller 40, ultimately making the voltage on the excitation winding as the load 20 the same or approximately the same as the preset value of the output voltage, and the current on the excitation winding the same or approximately the preset value of the output current.

[0102] The above description is based on the example that the control device 01 is a brushless electric excitation synchronous motor, and the excitation winding in the brushless electric excitation synchronous motor is used as the load 20. In other embodiments of the present application, the control device 01 may be a vehicle-mounted charging device, and the load 20 in the control device 01 may be a vehicle-mounted rechargeable battery. Alternatively, the control device 01 may be a server power supply device, and the load 20 in the control device 01 may be a server. Alternatively, the control device 01 may be a mechanical rotating arm power supply device, and the load 20 in the control device 01 may be a mechanical rotating arm. Alternatively, the control device 01 may be a light emitting diode (LED) power supply device, and the load 20 in the control device 01 may be an LED. For the sake of convenience, the following description is based on the example that the control device 01 is a brushless electric excitation synchronous motor, and the excitation winding in the brushless electric excitation synchronous motor is used as the load 20.

[0103] The structure of the primary feedback excitation power supply controller 40 is described below in conjunction with the control method of the primary feedback excitation power supply controller 40. In the embodiment of the present application, the control method of the primary feedback excitation power supply controller 40 includes the following steps: Figure 4 S101 and S102 shown.

[0104] S101. Calculate the excitation inductance L m.est , according to the input voltage Vt, input current I r , leakage inductance L of the primary winding lk1 And the calculated excitation inductance L m.est , calculate the output voltage V of the resonant power supply 10 o.est and output current I o.est .

[0105] In some embodiments of the present application, the above S101 may include the following: Figure 5 S201 to S204 shown.

[0106] S201, collect input voltage V t and input current I r .

[0107] The primary feedback excitation power supply controller 40 may include: Figure 6 The acquisition circuit 401 is shown. The acquisition circuit 401 is electrically connected to the primary winding 110. The acquisition circuit 401 is used to execute the above S201 to acquire the input voltage V t and input current I r .

[0108] S203, according to the input voltage V t 、Input current I r , leakage inductance L of the primary windinglk1 And the calculated excitation inductance L m.est , calculate the excitation voltage V m.est , excitation current I m.est and the primary current I pri.est .

[0109] The primary feedback excitation power supply controller 40 may include: Figure 6 The feedback circuit 402 and the primary side control circuit 403 are shown. The feedback circuit 402 can be electrically connected to the acquisition circuit 401 and the primary side control circuit 403. The feedback circuit 402 is used to receive the input voltage V collected by the acquisition circuit 401. t and input current I r , and receives the leakage inductance L of the primary winding 110 provided by the primary control circuit 403 lk1 And the calculated excitation inductance L m.est , to execute the above S203.

[0110] It should be noted that the leakage inductance L of the primary winding 110 is lk1 The estimated value of can be stored in the primary side control circuit 403 in advance.

[0111] In order to enable the feedback circuit 402 to perform the above S203, in some embodiments of the present application, the feedback circuit 402 may include: Figure 7 The voltage operation circuit 412 and the current operation circuit 422 are shown. The voltage operation circuit 412 can be electrically connected to the acquisition circuit 401 and the primary control circuit 403. The voltage operation circuit 412 is used to receive the input voltage V collected by the acquisition circuit 401. t and input current I r , and the leakage inductance L of the primary winding 110 provided by the primary control circuit 403 lk1 And, according to the input voltage V t 、Input current I r And the leakage inductance L of the primary winding lk1 Calculate the excitation voltage V m.est The calculated excitation voltage V m.est The following formula (1) can be satisfied.

[0112]

[0113] Based on this, in some embodiments of the present application, the hardware structure constituting the voltage operation circuit 412 can be as follows: Figure 8 As shown, the voltage operation circuit 412 may include: a differentiator 51, a first operational amplifier 61 and a second operational amplifier 62. The differentiator 51 is electrically connected to the acquisition circuit 401. The differentiator 51 is used to receive the I collected by the acquisition circuit 401.r , and obtain the input current I r The rate of change dI r / dt.

[0114] The first operational amplifier 61 is electrically connected to the differentiator 51 and the primary control circuit 403. r The rate of change dI r / dt and the leakage inductance L of the primary winding 110 lk1 Multiply them to get L lk1 ×(dI r / dt). The second operational amplifier 62 is electrically connected to the first operational amplifier 61 and the acquisition circuit 401. The second operational amplifier 62 is used to calculate the input voltage V provided by the acquisition circuit 401. t The output of the first operational amplifier 61 is L lk1 ×(dI r / dt) is used as the excitation voltage V m.est , thus obtaining the above formula (1). Wherein, the leakage inductance L of the above primary winding 110 is lk1 The value of can be used as the operational amplifier gain of the first operational amplifier 61.

[0115] It should be noted that Figure 8 Therefore, the input current I is calculated by the differentiator 51. r The rate of change dI r / dt, and then obtain L through the first operational amplifier 61 lk1 ×(dI r In this case, the first operational amplifier 61 is located between the differentiator 51 and the second operational amplifier 62. Alternatively, in other embodiments of the present application, L can be obtained by first using the first operational amplifier 61. lk1 ×I r Then, through the differentiator 51 or L lk1 ×(dI r In this case, the differentiator 51 is electrically connected between the first operational amplifier 61 and the second operational amplifier 62 .

[0116] also, Figure 7 The current operation circuit 422 in the feedback circuit 402 can be electrically connected to the voltage operation circuit 412 and the primary control circuit 403. The current operation circuit 422 is used to calculate the excitation voltage V according to the voltage operation circuit 412. m.est and the excitation inductance L calculated by the primary control circuit 403 m.est , calculate the excitation current I m.est and the primary current I pri.est Among them, the calculated excitation current Im.est The following formula (2) is satisfied, and the calculated primary current I pri.est The following formula (3) is satisfied.

[0117]

[0118] I pri.est =I r -I m.est ; (3)

[0119] Based on this, in some embodiments of the present application, the hardware structure constituting the current operation circuit 422 can be as follows: Figure 9 As shown, the current operation circuit 422 may include a third operational amplifier 63, an integrator 52, and a fourth operational amplifier 64. The third operational amplifier 63 may be electrically connected to the second operational amplifier 62 and the primary control circuit 403. The third operational amplifier 63 is used to obtain the excitation inductance L output by the primary control circuit 403. m.est The reciprocal of (1 / L m.est ) and the excitation voltage V m.est The product of V m.est ×(1 / L m.est ). Among them, the excitation inductance L output by the primary control circuit 403 is m.est The value can be used as the operational amplifier gain of the third operational amplifier 63.

[0120] The integrator 52 is electrically connected to the third operational amplifier 63. The integrator 52 is used to m.est Integrate and get the excitation current I m.est , to obtain the above formula (2). In addition, the fourth operational amplifier 64 is electrically connected to the integrator 52 and the acquisition circuit 402. The fourth operational amplifier 64 is used to calculate the input current Ir output by the acquisition circuit 402 and the excitation current I output by the integrator 52. m.est The difference between the two is used as the primary current I pri.est , to obtain the above formula (3).

[0121] It should be noted that Figure 9 Therefore, V is first calculated by the third operational amplifier 63. m.est ×(1 / L m.est ), and then the excitation voltage V is converted by the integrator 52. m.est Integrate and get the excitation current I m.est In this case, the integrator 52 is located between the third operational amplifier 63 and the fourth operational amplifier 64. Alternatively, in other embodiments of the present application, the excitation voltage V may be firstly m.estThe integration is then performed by the third operational amplifier 63 to calculate the integration result of the integrator 52 and the excitation inductance L m.est The reciprocal of (1 / L m.est ) to obtain the excitation current I m.est At this time, the third operational amplifier 63 may be located between the integrator 52 and the fourth operational amplifier 64 .

[0122] From the above formula (1), we can know that the excitation voltage V m.est The leakage inductance L of the primary winding 110 lk1 From formula (2) and formula (3), we can know that the excitation current I m.est and the excitation inductance L m.est Also, the primary current I pri.est The excitation current I m.est Therefore, the primary current I pri.est and the excitation inductance L m.est related.

[0123] Based on this, under different installation tolerances, or during transportation and use, the ideal axis position and actual axis position of the secondary winding 111 of the transformer 11 have different air gap distances. For example, as shown in Table 1, the radial deviation of the secondary winding 111, the leakage inductance L of the primary winding 110, lk1 And the actual excitation inductance L m Varies with the air gap distance.

[0124] Table 1

[0125]

[0126] It can be seen from Table 1 that when the air gap distance is different, the leakage inductance L of the primary winding 110 is lk1 The value of the change is not big, but the actual excitation inductance L m Therefore, when the air gap distance changes, the excitation voltage V calculated by the voltage operation circuit 412 will be m.est The leakage inductance L of the primary winding 110 lk1 Therefore, the excitation voltage V m.est The value of will not change significantly with the change of the air gap distance. Therefore, the excitation voltage V calculated by the voltage calculation circuit 412 is m.est The value is more accurate.

[0127] However, due to the excitation current I m.est And the primary current I pri.est and the calculated excitation inductance L m.est Since the actual excitation inductance L mThe value of will change greatly with the change of air gap distance, resulting in the calculated excitation current I m.est The actual excitation current I m.true The value of will be deviated. Figure 10 As shown, the excitation current I is calculated by the above current calculation circuit 422 using formula (2) m.est The waveform of the actual excitation current I m.true Therefore, the current calculation circuit 422 calculates the excitation current I m.est and the primary current I pri.est Previously, an initial estimate of the excitation inductance or the previously calculated excitation inductance L was required. m.est Perform real-time correction so that the primary current I calculated by the current calculation circuit 422 is pri.est and the excitation inductance L m.est The value of is more accurate. This is conducive to improving the final calculated output voltage V of the resonant power supply 10 o.est and output current I o.est Accuracy.

[0128] The primary side control circuit 403 controls the excitation inductance L m.est In the process of making corrections, you can Figure 9 The resistance value of the resistor in the third operational amplifier 63 is adjusted to achieve the operational amplifier gain of the third operational amplifier 63 (ie, the excitation inductance L m.est The purpose of adjusting the value of

[0129] Based on this, in order to m.est To make a real-time correction, the following step S203 may be performed before the above step S203 is performed.

[0130] S202. Calculate the excitation inductance L m.est , and calculate the excitation inductance L m.est And the leakage inductance L of the primary winding lk1 is transmitted to the feedback circuit 402 .

[0131] From the above, we can know that the excitation inductance L m.est The initial estimate of can be stored in Figure 7 In the primary control circuit 403 shown in FIG. Based on this, in some embodiments of the present application, a correction cycle can be set in the primary control circuit 403. The correction cycle can include at least one switching cycle T of the bridge circuit 120. In this case, in each correction cycle, the primary control circuit 403 can execute the above S202 to adjust the excitation inductance L m.est Perform calculations.

[0132] Alternatively, in other embodiments of the present application, Figure 3 The electric drive controller 22 shown can calculate the preset value of the output voltage (or output current) preset in the primary feedback excitation power supply controller 40, and the output voltage V calculated by the primary feedback excitation power supply controller 40 o.est (or output current I o.est ). When the difference exceeds a preset threshold, the electric drive controller 22 can output a correction instruction to the primary side control circuit 403 in the primary side feedback excitation power supply controller 40, so that the primary side control circuit 403 executes the above S202 according to the correction instruction to adjust the excitation inductance L. m.est Perform calculations.

[0133] When the primary control circuit 403 executes the above S202, the feedback circuit 402 can execute the above S203. Figure 7 The current calculation circuit 422 shown can use the modified excitation inductance L m.est For excitation current I m.est And the primary current I pri.est Perform calculations.

[0134] Figure 1B As shown, in each switching cycle T of the bridge circuit 120, the waveforms of the MOS transistors in the bridge circuit 120 have a certain acquisition phase T. cal The acquisition phase T cal In the example, the square wave signal V hb The voltage of the MOS transistor changes from the saturated conduction state (high level) to the cut-off state (low level), or from the cut-off state (low level) to the saturated conduction state (high level), and the switching state of the MOS transistor is in a state about to be converted. In addition, in this acquisition phase Tcal, the current actually flowing through the primary winding 110 of the transformer 11, that is, the actual primary current I pri is zero, causing the secondary circuit of the transformer 11, such as the rectifier 30, to be open-circuited when reflected back to the primary side. Figure 10 As shown, the actual excitation current I m.true The waveform of the input current I r The waveform overlaps, that is, I m.true =I r .

[0135] In this case, in the above acquisition phase T cal , the primary control circuit 403 can calculate the excitation inductance L m.est , and outputs it to the feedback circuit 402, so that the excitation current I calculated by the feedback circuit 402 m.est With input current I r is close to or the same as the calculated excitation current I m.estThe actual excitation current I m.true The same. At this time, the calculated primary current I pri.est The actual primary current I pri The same is zero, which improves the calculation accuracy.

[0136] Based on this, in order to determine whether the resonant power supply 10 is in the acquisition stage T cal Before the primary control circuit 403 executes the above S203, the control method of the primary control circuit 403 may further include: the primary control circuit 403 may calculate the oscillation frequency f of the bridge circuit 120 r , satisfying the following formula (4).

[0137]

[0138] In this case, the process of the primary side control circuit 403 executing the above S202 may include: setting the operating frequency f of the bridge circuit 120 to sw (1 / T) and oscillation frequency f r For comparison, when f sw <f r When the resonant power supply 10 has the above-mentioned acquisition phase T cal , at this time, the excitation inductance L can be calculated m.est .

[0139] From the above, we can see that when f sw <f r When the actual primary current I pri is zero, the actual excitation current I m.true The waveform of the input current I r The waveform overlaps, that is, the actual excitation current I m.true With input current I r The values ​​of are the same. Therefore, Figure 7 The primary side control circuit 403 shown in FIG. 4 can be configured to generate the excitation current I provided by the current operation circuit 422. m.est And the input current I provided by the sampling circuit 401 r , the absolute value of the excitation current of the bridge circuit 120 in the current switching cycle T |I m.est |With the absolute value of the input current|I r |Compare and compare the excitation inductance L m.est The size of |I is adjusted so that it is within the range allowed by the calculation tolerance. m.est |=|I r |. In this way, the excitation inductance L calculated by the primary control circuit 403 is m.est When the above formula (3) is substituted, the absolute value of the excitation current |I m.est |The absolute value of the actual excitation current|Im.true |same, or approximately the same, so that the calculated primary current I pri.est The actual primary current I pri Same, both are zero.

[0140] The following is the case when the primary control circuit 403 determines f sw <f r When the primary control circuit 403 calculates the excitation inductance L m.est The above S202 may include the following: Figure 11 S301 to S306 shown.

[0141] S301, determine f sw <f r .

[0142] The primary control circuit 403 starts to calculate the oscillation frequency f of the bridge circuit 120 r and the operating frequency f sw and oscillation frequency f r Compare. When f sw <f r When f sw ≥f r , execute the end step.

[0143] S302, acquisition phase T in the switching cycle T of the bridge circuit 120 cal Internally, the input current I r And the excitation current I m.est Specifically, when f sw <f r At the acquisition phase T of the switching cycle T of the bridge circuit 120, cal At any moment, the primary control circuit 403 can obtain the excitation current I calculated by the current calculation circuit 422. m.est , and the absolute value of the excitation current |I m.est |.

[0144] Among them, T cal =T / 2-T f / 2, T f =1 / f r . Thus, when f sw <f r When the primary control circuit 403 is in half a switching period T of the bridge circuit 120, after half a resonant period T f At any moment in the subsequent time period, that is, the above-mentioned acquisition phase T cal At any moment in the process, the excitation current I calculated by the current operation circuit 422 is collected. m.est For example, when fsw <f r When the primary control circuit 403 can collect the excitation current I calculated by the current operation circuit 422 at the moment before the MOS transistor in the bridge circuit 120 switches the switch state (for example, 400ns before the MOS transistor in the bridge circuit 120 switches the switch state), m.est .

[0145] In addition, if Figure 7 As shown, the primary side control circuit 403 is also electrically connected to the acquisition circuit 401. The primary side controller 403 can receive the input current I from the acquisition circuit 401. r , and the absolute value of the input current |I r |.

[0146] S303、I m.est |with|I r |Make a comparison.

[0147] The primary side controller 403 can m.est |with|I r |Compare, when |I m.est |>|I r |, execute S304, when |I m.est |<|I r |, execute S305, when |I m.est |=|I r |, execute S306.

[0148] S304: The excitation inductance L received by the feedback circuit 402 in the current switching cycle T of the bridge circuit 120 is converted to m.est Increase, so that |I m.est |=|I r |, and output to the feedback circuit 402.

[0149] When the primary side controller 403 determines |I m.est |>|I r |, in order to make the primary current I calculated by the feedback circuit 402 pri.est The actual primary current I pri The primary controller 403 can increase the excitation inductance L received by the feedback circuit 402 during the current switching cycle T of the bridge circuit 120. m.est , so that the excitation current I calculated by the feedback circuit 402 through formula (2) m.est The actual excitation current I m.true the same or approximately the same, so that |I m.est |=|I r|. Thus, the primary current I calculated by the feedback circuit 402 through the above formula (3) is pri.est is zero, which is consistent with the actual primary current I pri same.

[0150] In some embodiments of the present application, in order to enable the primary side controller 403 to control the excitation inductance L m.est The primary controller 403 can adjust the inductance L of the original calculated or pre-set excitation inductance when executing S304. m.est Based on the size, increase the above inductance adjustment value to make |I m.est |=|I r In addition, the primary side controller 403 can also be provided with an excitation inductor L. m.est The correction range makes the excitation inductance L m.est The correction value can always be within the correction range. The above correction range can ensure that the output voltage V o.est and output current I o.est Within the parameters allowed during product use.

[0151] S305: The excitation inductance L received by the feedback circuit 402 in the current switching cycle T of the bridge circuit 120 is converted to m.est Reduce, so that |I m.est |=|I r |, and output to the feedback circuit 402.

[0152] When the primary side controller 403 determines |I m.est |<|I r |, in order to make the primary current I calculated by the feedback circuit 402 pri.est The actual primary current I pri The primary controller 403 can reduce the excitation inductance L received by the feedback circuit 402 during the current switching cycle T of the bridge circuit 120. m.est , so that the excitation current I calculated by the feedback circuit 402 through formula (2) m.est The actual excitation current I m.true the same or approximately the same, so that |I m.est |=|I r |. Thus, the primary current I calculated by the feedback circuit 402 through the above formula (3) is pri.est is zero, which is consistent with the actual primary current I pri In addition, the calculated excitation inductance L m.est Always within the above correction range.

[0153] S306: The excitation inductance L received by the feedback circuit 402 in the current switching cycle T of the bridge circuit 120 is converted to m.est Output to the feedback circuit 402 .

[0154] When the primary side controller 403 determines |I m.est |=|I r When |, the primary current I calculated by the feedback circuit 402 using the above formula (3) pri.est is zero, which is consistent with the actual primary current I pri At this time, the excitation inductance L calculated by the primary controller 403 is m.est is the same or approximately the same as the actual excitation inductance, so the primary side controller 403 can provide the excitation inductance L last provided to the feedback circuit 402 m.est The signal is output to the feedback circuit 402 again.

[0155] After executing the above steps S304 to S306, the primary side controller 403 can output the calculated excitation inductance L to the current calculation circuit 422. m.est In this way, the next time the excitation inductance L m.est Before the correction is performed, the current calculation circuit 422 calculates the excitation current I using formula (2) m.est In the process, the excitation inductance L calculated above can be used m.est . Thus, the excitation current I calculated by the current calculation circuit 422 can be m.est And the primary current I pri.est More accurate.

[0156] Alternatively, in some other embodiments of the present application, the primary side controller 403 calculates the excitation inductance L m.est The correction method of the value can be that the primary control circuit 403 determines the primary current I calculated by the feedback circuit 402 pri.est When the excitation inductance L received by the feedback circuit 402 in the current switching cycle T of the bridge circuit 120 is zero, m.est Output to the feedback circuit 402 .

[0157] In this way, when the primary control circuit 403 determines the primary current I calculated by the feedback circuit 402 pri.est When it is zero, the calculated primary current I pri.est The actual primary current I pri The same, both are zero. At this time, the excitation inductance L calculated by the primary controller 403 is m.est is the same or approximately the same as the actual excitation inductance, so the primary side controller 403 can provide the excitation inductance L last provided to the feedback circuit 402 m.est The signal is output to the feedback circuit 402 again.

[0158] It should be noted that, as can be seen from the above, under different installation tolerances of the transformer 11, or during transportation and use, there are different air gap distances between the ideal axis position and the actual axis position of the secondary winding 111 of the transformer 11, and the actual excitation inductance L m Therefore, before the resonant power supply 10 or the entire control device 01 leaves the factory, the primary side controller 403 can calculate the excitation inductance L m.est , so that the calculated excitation inductance L m.est The same or approximately the same as the actual excitation inductance to reduce the calculated excitation inductance L due to installation tolerances m.est The actual excitation inductance L m There is a large discrepancy between the values.

[0159] Alternatively, when the resonant power supply 10 or the entire control device 01 is transported to the destination, the primary side controller 403 can calculate the excitation inductance L m.est , in order to reduce the excitation inductance L required for calculation due to transportation m.est and the actual excitation inductance L m In addition, when the resonant power supply 10 or the entire control device 01 is transported to the destination and put into normal operation, the mechanical components of the resonant power supply 10 or the entire control device 01 can be in a stable state. At this time, the actual excitation inductance L m The value of is stable. At this time, the primary controller 403 can stop calculating the excitation inductance L m.est Alternatively, when the resonant power supply 10 or the mechanical components of the entire control device 01 are in a stable state, the actual excitation inductance L m The value is stable. At this time, if the calculated output voltage V of the resonant power supply 10 is o.est and output current I o.est If the preset accuracy requirement is not met, it means that the actual axis position of the secondary winding 111 of the transformer 11 has seriously deviated. Figure 3 The primary feedback excitation power supply controller 40 or the electric drive controller 22 may issue an alarm signal to instruct the user to adjust the actual axis position of the secondary winding 111 of the transformer 11 to make it close to the ideal axis position.

[0160] When calculating the excitation inductance L m.est Afterwards, Figure 7 The feedback circuit 402 is further configured to execute the following S204 .

[0161] S204, according to the excitation voltage V m.est , primary current I pri.est Calculate the output voltage V of the resonant power supply 10o.est and output current I o.est .

[0162] The feedback circuit 402 is as follows Figure 7 The output voltage and current operation circuit 432 may be included. The output voltage and current operation circuit 432 is electrically connected to the voltage operation circuit 412, the current operation circuit 422 and the primary control circuit 403. The output voltage and current operation circuit 432 is used to receive the excitation voltage V output by the voltage operation circuit 412. m.est , the primary current I output by the current calculation circuit 422 pri.est , and execute the above S204.

[0163] Before the output voltage and current calculation circuit 432 executes the above S204, the primary control circuit 403 can calculate the oscillation frequency f of the bridge circuit 120. r , and execute as Figure 12 In step S401, the operating frequency f sw and oscillation frequency f r According to the working frequency f sw and oscillation frequency f r The comparison result of the output voltage and current operation circuit 432 performs the above-mentioned process of S204, which may include the following steps: Figure 12 S402~S405 shown in FIG. Among them, when f sw ≥f r When f sw <f r , execute S402.

[0164] S403, calculating the excitation voltage V within one switching cycle T of the bridge circuit 120 m.est Average value of absolute value|V m.est | avg , and the primary current I pri.est Average of absolute values ​​|I pri.est | avg .

[0165] When the primary side control circuit 403 (such as Figure 7 As shown) determine f sw ≥f r When, such as Figure 13A As shown, the excitation voltage V m.est The waveform of has an AC component in the switching period T. The AC component is mainly fed back to the primary leakage inductance L by the secondary winding 111 in the transformer 11. lk2 The average voltage of the AC component in one switching cycle T is zero. Therefore, the leakage inductance L fed back from the secondary winding 111 to the primary side is lk2 For excitation voltage V m.estThe impact can be ignored.

[0166] At this time, when f sw ≥f r When the AC voltage on the secondary winding 111 of the transformer 11 is reflected back to the primary side (after conversion by the turns ratio K), it can be compared with the excitation voltage V m.est From the above, it can be seen that the rectifier 30 converts the AC power on the secondary winding 111 into DC power, which can then be used as the output voltage V of the resonant power supply 10. o.est Therefore, the output voltage and current calculation circuit 432 can calculate the absolute value (absolute value, abs) of the excitation voltage within one switching cycle T of the bridge circuit 120 |V m.est Then, calculate the average value of the absolute value of each excitation voltage within a switching cycle T |V m.est | avg The average value of the absolute value of the excitation voltage |V m.est | avg Calculate the output voltage V of the resonant power supply 10 o.est From the above, we can know that the excitation voltage V m.est The value of will not change significantly with the change of air gap distance, so the excitation voltage V m.est The calculated output voltage V o.est The value can have higher precision.

[0167] In addition, similarly, when f sw ≥f r When the AC current on the secondary winding 111 of the transformer 11 is reflected back to the primary side (converted by the turns ratio K), it can be compared with the primary current I pri.est From the above, it can be seen that the rectifier 30 converts the AC power on the secondary winding 111 into DC power, which can then be used as the output current I of the resonant power supply 10. o.est Therefore, the output voltage and current calculation circuit 432 can calculate the primary current I in one switching cycle T of the bridge circuit 120. pri.est The absolute value of |I pri.est |. Then, calculate the primary current I of each switching cycle T pri.est The average of the absolute values ​​of |I pri.est | avg . Thus, the primary current I pri.est The average of the absolute values ​​of |I pri.est | avg , calculate the output current I of the resonant power supply 10 o.est .

[0168] In this case, if Figure 14As shown, the output voltage and current operation circuit 432 may include a fifth operational amplifier 65 and a first low pass filter (LPF) 71 , a sixth operational amplifier 66 , a second low pass filter 72 and an operation processing circuit 70 .

[0169] The fifth operational amplifier 65 can be electrically connected to the second operational amplifier 62 and the operational processing circuit 70. The fifth operational amplifier 65 is used to calculate the excitation voltage V m.est The absolute value of V m.est |, and outputs it to the operation processing circuit 70. The first low-pass filter 71 is electrically connected to the fifth operational amplifier 65 and the operation processing circuit 70. The first low-pass filter 71 is used to receive the excitation voltage V provided by the fifth operational amplifier 65. m.est The absolute value of V m.est |, calculate the excitation voltage V m.est Average value of absolute value|V m.est | avg and outputs the calculation result to the operation processing circuit 70.

[0170] The sixth operational amplifier 66 can be electrically connected to the fourth operational amplifier 64 and the operational processing circuit 70. The sixth operational amplifier 66 is used to calculate the primary current I pri.est The absolute value of |I pri.est |, and output to the operation processing circuit 70. The second low-pass filter 72 can be electrically connected to the sixth operational amplifier 66 and the operation processing circuit 70. The second low-pass filter 72 is used to receive the primary current I provided by the sixth operational amplifier 66. pri.est The absolute value of |I pri.est |, calculate the primary current I pri.est Average of absolute values ​​|I pri.est | avg and outputs the calculation result to the operation processing circuit 70.

[0171] S405: Calculate the output voltage V of the resonant power supply 10 based on the turns ratio K of the primary winding 110 and the secondary winding 111. o.est and output current I o.est .

[0172] When f sw ≥f r When the output voltage and current calculation circuit 432 executes the above S403, as shown in FIG. Figure 14 As shown, the operation processing circuit 70 in the output voltage and current operation circuit 432 can calculate the excitation voltage V according to the first low-pass filter 71. m.est The average value of the absolute value of V m.est | avg, and the turns ratio K (K=N p / N s ), calculate the above output voltage V o.est The output voltage V o.est Satisfies the following formula:

[0173]

[0174] In addition, when f sw ≥f r When the output voltage and current calculation circuit 432 executes the above S403, as shown in FIG. Figure 14 As shown, the operation processing circuit 70 in the output voltage and current operation circuit 432 can calculate the primary current I according to the second low-pass filter 72. pri.est Average of absolute values ​​|I pri.est | avg , and the turns ratio K (K=N p / N s ), calculate the above output current I o.est The output current I o.esr Satisfies the following formula:

[0175]

[0176] S402, calculating the primary current I within one switching cycle T of the bridge circuit 120 pri.est Average of absolute values ​​|I pri.est | avg , and continuously obtain multiple excitation voltages V in half a switching cycle (T / 2) of the bridge circuit 120 m.est The absolute value of V m.est | and multiple primary currents I pri.est The absolute value of |I pri.est |.

[0177] When the primary side control circuit 403 (such as Figure 7 As shown) determine f sw <f r When one switching cycle T of the bridge circuit 120 has Figure 13B The acquisition phase T cal From the above, we can see that in the acquisition stage T cal , the current actually flowing through the primary winding 110 of the transformer 11, that is, the primary current I pri like Figure 13B The secondary circuit of transformer 11, such as rectifier 30, reflects back to the primary side and is in an open circuit state. The secondary circuit of transformer 11 will have a current dead zone. At this time, the excitation voltage V m.estThe average value of the absolute value of V m.est | avg The open circuit voltage of the rectifier 30 is superimposed. Therefore, the excitation voltage V m.est Average value of absolute value|V m.est | avg , calculate the above output voltage V o.est , the output voltage V o.est The value is inaccurate.

[0178] In addition, if Figure 13B As shown, when f sw <f r When (in the above acquisition phase T cal Internal), primary current I pri.est is zero, the primary current I pri.est The slope (dI pri.est / dt) is zero. And, in each half cycle (T / 2) of the switching period T, the primary current I pri.est The slope at its peak position (dI pri.est / dt) is also zero. At this time, the primary current I pri.est The excitation voltage V corresponding to its peak position m.est ,exist Figure 13B Point A shown and the output voltage V o.est The voltage reflected back to the original side (N p / N s )×V o.est Therefore, the primary current I pri.est The excitation voltage V corresponding to its peak position m.est Calculate the output voltage V o.est .

[0179] In this case, when the output voltage and current calculation circuit 432 executes the above S402, Figure 14 As shown, the operation processing circuit 70 in the output voltage and current operation circuit 432 can continuously obtain multiple excitation voltages V through the fifth operational amplifier 65 in half a cycle (T / 2) of the switching cycle T. m.est The absolute value of V m.est Moreover, the operation processing circuit 70 can also continuously obtain multiple primary currents I through the sixth operational amplifier 66. pri.est The absolute value of |I pri.est |.

[0180] S404, from multiple primary currents I pri.est The absolute value of |I pri.est |The primary current I is obtained from pri.est Peak value of absolute value|I pri.est | max, and the peak value |I pri.est | max Match the absolute value of the excitation voltage |V m1 |.

[0181] When the output voltage and current calculation circuit 432 executes the above-mentioned S404, as shown in FIG. Figure 14 As shown, the operation processing circuit 70 in the output voltage and current operation circuit 432 can obtain the current from multiple primary currents I pri.est The absolute value of |I pri.est |The primary current I is obtained from pri.est Peak absolute value |I pri.est | max In addition, the input and output voltage and current calculation circuit 432 can also obtain the peak value |I pri.est | max Match the absolute value of the excitation voltage |V m1 |.

[0182] Next, after the output voltage and current operation circuit 432 executes S404, the operation processing circuit 70 in the output voltage and current operation circuit 432 may execute the above S405 to calculate the output voltage and current according to the turns ratio K (K=N p / N s ), and the peak value |I pri.est | max Match the absolute value of the excitation voltage |V m1 |, calculate the above output voltage V o.est The output voltage V o.est Satisfies the following formula:

[0183]

[0184] In addition, the arithmetic processing circuit 70 can calculate the number of turns of the primary winding 110 and the secondary winding 111 according to the turn ratio K (K=N p / N s ), and the primary current I pri.est Average of absolute values ​​|I pri.est | avg , calculate the above output current I o.est The output current I o.est Satisfies the following formula:

[0185]

[0186] S102 : Output the driving signal Sd to the bridge circuit 120 .

[0187] like Figure 7As shown, the output voltage and current calculation circuit 432 in the feedback circuit 402 can calculate the output voltage V of the resonant power supply 10. o.est and output current I o.est is transmitted to the primary control circuit 403, so that the primary control circuit 403 receives the output voltage V o.est and output current I o.est Then, in the electric drive controller 22 (such as Figure 3 As shown in FIG), the above S102 can be executed. Figure 14 As shown, the primary side control circuit 403 can output voltage V o.est and output current I o.est Under the control of the electric drive controller 22 , the drive signal Sd provided to the bridge circuit 120 is adjusted, so that the resonant power supply 10 can be closed-loop controlled.

[0188] In some embodiments of the present application, the primary side control circuit 403 and the operation processing circuit 70 in the output voltage and current operation circuit 432 can be integrated into the same electronic component. For example, the chip can be as follows: Figure 14 In the digital signal processor 200 shown.

[0189] As can be seen from the above, in the process of the resonant power supply 10 provided in the embodiment of the present application supplying power to the load 20, the primary feedback excitation power supply controller in the resonant power supply 10 includes the following Figure 6 The collection circuit 401, the feedback circuit 402 and the primary side control circuit 403 are shown. The feedback circuit 402 can collect the input voltage V according to the collection circuit 401. t and input current I r , the excitation inductance L output by the primary control circuit 403 m.est And the leakage inductance L of the primary winding lk1 , calculate the excitation voltage V m.est and the primary current I pri.est In addition, the feedback circuit 402 can also be based on the excitation voltage V m.est and the primary current I pri.est , calculate the output voltage V of the resonant power supply 10 o.est and output current I o.est .

[0190] When the primary side control circuit 403 controls the oscillation frequency f of the bridge circuit 120 r and the operating frequency f of the bridge circuit 120 sw If the comparison results are different, the feedback circuit 402 will respond according to the excitation voltage V m.est and the primary current I pri.est , calculate the output voltage V of the resonant power supply 10 o.est and output current Io.est The methods are also different.

[0191] For example, when f sw ≥f r When the excitation voltage V m.est Average value of absolute value|V m.est | avg Can be used directly to calculate the output voltage V o.est Therefore, the feedback circuit 402 can calculate the excitation voltage V within one switching cycle T of the bridge circuit 120 m.est The average value of V m.est | avg , combined with the turns ratio K of the primary winding 110 and the secondary winding 111, calculate the output voltage V o.est In addition, the feedback circuit 402 can calculate the primary current I pri.est The average value of I pri.est | avg , combined with the above turns ratio K, calculate the output current I o.est .

[0192] In addition, when f sw <f r When the secondary circuit of the transformer 11, such as the rectifier 30, reflects back to the primary side, it will be in an open circuit state. At this time, the excitation voltage V m.est The average value of V m.est | avg The open circuit voltage of the rectifier 30 will be superimposed, so the excitation voltage V m.est The average value of V m.est | avg To calculate the output voltage V o.est .

[0193] In this case, in order to increase the output voltage V o.est and output current I o.est The calculation accuracy of the feedback circuit 402 can continuously obtain multiple excitation voltages V in half a cycle of the switching cycle T of the bridge circuit 120. m.est The absolute value of V m.est | and multiple primary currents I pri.est The absolute value of |I pri.est |. Then, from multiple primary currents I pri.est The absolute value of |I pri.est |The primary current I is obtained from pri.est Peak value of absolute value|I pri.est | max , and the peak value |I pri.est | maxMatch the absolute value of the excitation voltage |V m1 Next, the feedback circuit 402 can be used to generate the peak value|I pri | max Match the absolute value of the excitation voltage |V m1 | and the turns ratio K to calculate the output voltage V o.est In addition, the feedback circuit 402 can be based on the primary current I pri.est Average of absolute values ​​|I pri.est | avg And the turns ratio K is used to calculate the output current I o.est .

[0194] In this way, the resonant power supply 10 provided in the embodiment of the present application is used to obtain the output voltage V o.est and output current I o.est During the process, on the one hand, the excitation inductance L is controlled by the primary control circuit 403 during the switching period T of the bridge circuit 120. m.est On the other hand, by adjusting the oscillation frequency f of the bridge circuit 120 r and the operating frequency f of the bridge circuit 120 sw Compare and calculate the output voltage V of the resonant power supply 10 in different ways according to different comparison results. o.est and output current I o.est Therefore, the output voltage V obtained by using the resonant power supply 10 provided in the embodiment of the present application is o.est The error is as Figure 15 As shown in curve ①, the output current I o.est The error is as Figure 15 As shown by curve ② in the figure. From the above curves ① and ②, it can be seen that when f sw <f r When, or, f sw ≥f r When the output voltage V o.est The absolute value of the error and the output current I o.est The absolute value of the error can be less than 1.5%.

[0195] With respect to the present application, the operating frequency f of the bridge circuit 120 is sw Taking 50kHz as an example, when the primary control circuit 403 is in the switching period T of the bridge circuit 120, the excitation inductance L m.est When the estimated value of the excitation inductance is used, as shown in Table 2, the output current I o.est The error will increase with the excitation inductance L m.est increases with the increase of the error.

[0196] Table 2

[0197] <![CDATA[Error of excitation inductance L m.est > <![CDATA[Output current I o.est error]]> 0％ -1.12％ -30％ 8.57％

[0198] As can be seen from Table 2, when the transformer 11 is installed under different tolerances, or during transportation and use, the excitation inductance L m.est The absolute value of the error increases from 0 to 30%, the output current I o.est The absolute value of the error will increase from 1.12% to 8.57%, which is higher than the output current I o.est The absolute value of the error is (1.5%).

[0199] In addition, when f sw <f r When the secondary circuit of the transformer 11, such as the rectifier 30, reflects back to the primary side and becomes open circuit. m.est The average value of V m.est | avg To calculate the output voltage V o.est ,like Figure 16 As shown in the error curve ②, the output voltage V o.est The error can reach 4%.

[0200] However, this application is in f sw <f r When the excitation voltage V m.est The average value of V m.est | avg To calculate the output voltage V o.est So calculate the output voltage V o.est ,like Figure 16 As shown in the error curve ①, the output voltage V o.est Therefore, in the resonant power supply 10 provided by the present application, by electrically connecting the primary feedback excitation power supply controller 40 to the primary winding 110, the calculated output voltage V can be ensured on the basis of simplifying the secondary circuit in the transformer 11. o.est , output current I o.est It has high precision and avoids the primary feedback excitation power supply controller 40 from being affected by high eccentricity and high temperature when it runs at high speed together with the rotating shaft.

[0201] The above is a control method of the primary feedback excitation power supply controller 40. Figure 14 The various electronic components shown are used as examples for the purpose of illustration. Alternatively, embodiments of the present application further provide a computer-readable storage medium, which may include computer instructions. When the computer instructions are executed on the primary-side feedback excitation power supply controller 40 in the control device 01, the primary-side feedback excitation power supply controller 40 executes the control method described above.

[0202] In addition, an embodiment of the present application further provides a computer program product, which includes computer instructions. When the computer instructions are executed on the primary feedback excitation power supply controller 40 in the control device 01, the primary feedback excitation power supply controller 40 executes the above control method.

[0203] The above are only specific embodiments of the present application, but the scope of protection of this application is not limited thereto. Any changes or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in this application should be included in the scope of protection of this application. Therefore, the scope of protection of this application should be based on the scope of protection of the claims.

Claims

1. A resonant power supply, characterized in that: include: A transformer, including a primary winding and a secondary winding; a bridge circuit, electrically connected to the power supply, for converting the direct current provided by the power supply into a square wave signal according to the drive signal; The LC series resonant network is electrically connected to the bridge circuit and the primary winding, and is used to convert the square wave signal into alternating current and output it to the primary winding; the alternating current includes an input voltage V t and input current I r ; a rectifier, electrically connected to the secondary winding, for converting the alternating current on the secondary winding into direct current; A primary feedback excitation power supply controller is electrically connected to the primary winding, the bridge circuit and the LC series resonant network. The primary feedback excitation power supply controller is used to calculate the excitation inductance L m.est , and receives the input voltage V t and the input current I r and outputting the driving signal to the bridge circuit; The acquisition phase T in the switching cycle T of the bridge circuit cal The primary feedback excitation power supply controller calculates the excitation inductance L m.est The primary feedback excitation power supply controller is used to adjust the operating frequency f of the bridge circuit. sw and oscillation frequency f r Compare; when f sw <f r When the primary feedback excitation power supply controller sets the absolute value of the excitation current of the bridge circuit in the current switching cycle T|I m.est |The absolute value of the input current|I r |Compare to correct the excitation inductance L m.est , so that |I m.est |=|I r |; Corrected excitation inductance L m.est As the calculated excitation inductance L m.est .

2. The resonant power supply according to claim 1, characterized in that The primary side feedback excitation power supply controller is used to calculate the excitation inductance L m.est , and receives the input voltage V t and the input current I r and outputting the driving signal to the bridge circuit comprises: The primary feedback excitation power supply controller is used to adjust the input voltage V t , the input current I r , the leakage inductance L of the primary winding lk1 And the calculated excitation inductance L m.est , calculate the output voltage V of the resonant power supply o.est and output current I o.est , and according to the output voltage V of the resonant power supply o.est and output current I o.est The driving signal is output to the bridge circuit.

3. The resonant power supply according to claim 2, characterized in that: The primary side feedback excitation power supply controller includes: The acquisition circuit is electrically connected to the primary winding and is used to acquire the input voltage V t and the input current I r ; The feedback circuit is electrically connected to the acquisition circuit and is used to t , the input current I r , the leakage inductance L of the primary winding lk1 And the calculated excitation inductance L m.est , calculate the excitation voltage V m.est , excitation current I m.est and the primary current I pri.est , and according to the calculated excitation voltage V m.est , the primary current I pri.est Calculate the output voltage V of the resonant power supply o.est and output current I o.est ; in, I pri.est =I r -I m.est ; The primary side control circuit is electrically connected to the feedback circuit and the bridge circuit and is used to calculate the excitation inductance L m.est and the leakage inductance L of the primary winding lk1 And the calculated excitation inductance L m.est transmitted to the feedback circuit.

4. The resonant power supply according to claim 3, characterized in that: The inductance of the resonant inductor in the LC series resonant network is L r , the capacitance of the resonant capacitor is C r The primary control circuit is also used to calculate the oscillation frequency f r ; in, The primary side control circuit is used to calculate the excitation inductance L m.est include: The primary side control circuit is used to adjust the operating frequency f of the bridge circuit sw With the oscillation frequency f r For comparison, when f sw <f r At the acquisition phase T in the switching cycle T of the bridge circuit cal The absolute value of the excitation current calculated by the feedback circuit in the current switching cycle T of the bridge circuit |I m.est |The absolute value of the input current|I r | Make a comparison; When|I m.est |>|I r |When the bridge circuit is in the current switching cycle T, the excitation inductance L received by the feedback circuit m.est Increase, so that |I m.est |=|I r |, and output to the feedback circuit; When|I m.est |<|I r |When the bridge circuit is in the current switching cycle T, the excitation inductance L received by the feedback circuit m.est Reduce, so that |I m.est |=|I r |, and output to the feedback circuit; When|I m.est |=|I r |When the bridge circuit is in the current switching cycle T, the excitation inductance L received by the feedback circuit m.est output to the feedback circuit; Among them, T cal =T / 2-T f / 2, T f =1 / f r .

5. The resonant power supply according to claim 3, characterized in that: The primary side control circuit is used to calculate the excitation inductance L m.est include: The primary side control circuit is used to determine the primary side current I calculated by the feedback circuit pri.est When the excitation inductance L received by the feedback circuit in the current switching cycle T of the bridge circuit is zero, m.est output to the feedback circuit.

6. The resonant power supply according to claim 4 or 5, characterized in that: The feedback circuit comprises: The voltage operation circuit is electrically connected to the acquisition circuit and the primary side control circuit, and is used to calculate the voltage according to the input voltage V t , the input current I r And the leakage inductance L of the primary winding provided by the primary control circuit lk1 Calculate the excitation voltage V m.est ; The current operation circuit is electrically connected to the voltage operation circuit and the primary control circuit, and is used to calculate the current according to the excitation voltage V m.est and the excitation inductance L calculated by the primary control circuit m.est , calculate the excitation current I m.est and the primary current I pri.est ; The output voltage and current operation circuit is electrically connected to the voltage operation circuit, the current operation circuit and the primary control circuit, and is used to output the voltage and current according to the excitation voltage V m.est , the primary current I pri.est Calculate the output voltage V of the resonant power supply o.est and output current I o.est .

7. The resonant power supply according to claim 6, characterized in that: The voltage operation circuit includes: A differentiator is electrically connected to the acquisition circuit and is used to obtain the input current I r rate of change; The first operational amplifier is electrically connected to the differentiator and the primary control circuit to convert the input current I r The rate of change is related to the leakage inductance L of the primary winding lk1 Multiply to get L lk1 ×(dI r / dt); A second operational amplifier is electrically connected to the first operational amplifier and the acquisition circuit, and is used to calculate the input voltage V t With the first op amp output L lk1 ×(dI r / dt) as the excitation voltage V m.est .

8. The resonant power supply according to claim 7, characterized in that: The current operation circuit includes: A third operational amplifier is electrically connected to the second operational amplifier and the primary control circuit, and is used to obtain the excitation inductance L calculated by the primary control circuit. m.est The reciprocal of the excitation voltage V m.est The product of The integrator is electrically connected to the third operational amplifier and is used to m.est Integrate to obtain the excitation current I m.est ; A fourth operational amplifier is electrically connected to the integrator and the acquisition circuit, and is used to calculate the input current Ir and the excitation current I m.est The difference is taken as the primary current I pri.est .

9. The resonant power supply according to claim 8, characterized in that: The output voltage and current operation circuit includes: A fifth operational amplifier, electrically connected to the second operational amplifier, is used to calculate the excitation voltage V m.est The absolute value of V m.est |; A first low-pass filter is electrically connected to the fifth operational amplifier and is used to calculate the excitation voltage V m.est The average value of the absolute value of V m.est | avg ; A sixth operational amplifier is electrically connected to the fourth operational amplifier and is used to calculate the primary current I pri.est The absolute value of |I pri.est |; A second low-pass filter is electrically connected to the sixth operational amplifier and is used to calculate the primary current I pri.est The average of the absolute values ​​of |I pri.est | avg ; an operational processing circuit, electrically connected to the fifth operational amplifier, the first low-pass filter, the sixth operational amplifier, and the second low-pass filter; When the primary side control circuit determines that f sw ≥f r When the arithmetic processing circuit is used to calculate the excitation voltage V in a switching cycle T of the bridge circuit, m.est Average value of absolute value|V m.est | avg , the primary current I pri.est Average of absolute values ​​|I pri.est | avg , and the turns ratio K of the primary winding and the secondary winding, calculate the output voltage V of the resonant power supply o.est and output current I o.est ; in, When the primary side control circuit determines that f sw <f r When the operation processing circuit is used to obtain the primary current I from the plurality of primary currents I in half a switching cycle T of the bridge circuit, pri.est The absolute value of |I pri.est |The primary current I is obtained from pri.est Peak absolute value |I pri.est | max , and the peak value |I pri.est | max Match the absolute value of the excitation voltage |V m1 |, and according to the primary current I pri.est Average of absolute values ​​|I pri.est | avg , and the turns ratio K of the primary winding and the secondary winding of the transformer, calculate the output voltage V of the resonant power supply o.est and output current I o.est ; in, 10. A primary side feedback excitation power supply controller, characterized in that: It is electrically connected to the bridge circuit, LC series resonant network and primary winding of the transformer in the resonant power supply; the primary feedback excitation power supply controller is used to calculate the excitation inductance L m.est , and receives the input voltage V provided by the LC series resonant network t and input current I r and outputs a driving signal to the bridge circuit; the driving signal is used to drive the bridge circuit to convert the direct current provided by the power supply into a square wave signal; The acquisition phase T in the switching cycle T of the bridge circuit cal The primary feedback excitation power supply controller calculates the excitation inductance L m.est The primary feedback excitation power supply controller is used to adjust the operating frequency f of the bridge circuit. sw and oscillation frequency f r Compare; when f sw <f r When the primary feedback excitation power supply controller sets the absolute value of the excitation current of the bridge circuit in the current switching cycle T|I m.est |The absolute value of the input current|I r |Compare to correct the excitation inductance L m.est , so that |I m.est |=|I r |; Corrected excitation inductance L m.est As the calculated excitation inductance L m.est .

11. The primary side feedback excitation power supply controller according to claim 10, characterized in that: The primary side feedback excitation power supply controller is used to calculate the excitation inductance L m.est , and receives the input voltage V provided by the LC series resonant network t and input current I r and outputting the driving signal to the bridge circuit comprises: The primary feedback excitation power supply controller is used to adjust the input voltage V t , the input current I r , the leakage inductance L of the primary winding lk1 And the calculated excitation inductance L m.est , calculate the output voltage V of the resonant power supply o.est and output current I o.est , and according to the output voltage V of the resonant power supply o.est and output current I o.est The driving signal is output to the bridge circuit.

12. The primary side feedback excitation power supply controller according to claim 11, characterized in that: The primary side feedback excitation power supply controller includes: The acquisition circuit is electrically connected to the primary winding and is used to acquire the input voltage V t and the input current I r ; The feedback circuit is electrically connected to the acquisition circuit and is used to t , the input current I r , the leakage inductance L of the primary winding lk1 And the calculated excitation inductance L m.est , calculate the excitation voltage V m.est , excitation current I m.est and the primary current I pri.est , and according to the calculated excitation voltage V m.est , the primary current I pri.est Calculate the output voltage V of the resonant power supply o.est and output current I o.est ; in, I pri.est =I r -I m.est ; The primary side control circuit is electrically connected to the feedback circuit and the bridge circuit and is used to calculate the excitation inductance L m.est and the leakage inductance L of the primary winding lk1 And the calculated excitation inductance L m.est transmitted to the feedback circuit.

13. The primary side feedback excitation power supply controller according to claim 12, characterized in that: The inductance of the resonant inductor in the LC series resonant network is L r , the capacitance of the resonant capacitor is C r The primary control circuit is also used to calculate the oscillation frequency f r ; in, The primary side control circuit is used to calculate the excitation inductance L m.est The primary side control circuit is used to adjust the operating frequency f of the bridge circuit. sw With the oscillation frequency f r For comparison, when f sw <f r When the switching period T of the bridge circuit is T, the cal The absolute value of the excitation current calculated by the feedback circuit in the current switching cycle T of the bridge circuit |I m.est |The absolute value of the input current|I r | Make a comparison; When|I m.est |>|I r |When the bridge circuit is in the current switching cycle T, the excitation inductance L received by the feedback circuit m.est Increase, so that |I m.est |=|I r |, and output to the feedback circuit; When|I m.est |<|I r |When the bridge circuit is in the current switching cycle T, the excitation inductance L received by the feedback circuit m.est Reduce, so that |I m.est |=|I r |, and output to the feedback circuit; When|I m.est |=|I r |When the bridge circuit is in the current switching cycle T, the excitation inductance L received by the feedback circuit m.est output to the feedback circuit; Among them, T cal =T / 2-T f / 2, T f =1 / f r .

14. The primary side feedback excitation power supply controller according to claim 12, characterized in that: The primary side control circuit is used to calculate the excitation inductance L m.est include: The primary side control circuit is used to determine the primary side current I calculated by the feedback circuit pri.est When the excitation inductance L received by the feedback circuit in the current switching cycle T of the bridge circuit is zero, m.est output to the feedback circuit.

15. The primary side feedback excitation power supply controller according to claim 13 or 14, characterized in that: The feedback circuit comprises: The voltage operation circuit is electrically connected to the acquisition circuit and the primary side control circuit, and is used to calculate the voltage according to the input voltage V t , the input current I r And the leakage inductance L of the primary winding provided by the primary control circuit lk1 Calculate the excitation voltage V m.est ; The current operation circuit is electrically connected to the voltage operation circuit and the primary control circuit, and is used to calculate the current according to the excitation voltage V m.est and the excitation inductance L calculated by the primary control circuit m.est , calculate the excitation current I m.est and the primary current I pri.est ; The output voltage and current operation circuit is electrically connected to the voltage operation circuit, the current operation circuit and the primary control circuit, and is used to output the voltage and current according to the excitation voltage V m.est , the primary current I pri.est Calculate the output voltage V of the resonant power supply o.est and output current I o.est .

16. The primary side feedback excitation power supply controller according to claim 15, characterized in that: The voltage operation circuit includes: A differentiator is electrically connected to the acquisition circuit and is used to obtain the input current I r rate of change; The first operational amplifier is electrically connected to the differentiator and the primary control circuit to convert the input current I r The rate of change is related to the leakage inductance L of the primary winding lk1 Multiply to get L lk1 ×(dI r / dt); A second operational amplifier is electrically connected to the first operational amplifier and the acquisition circuit, and is used to calculate the input voltage V t With the first op amp output L lk1 ×(dI r / dt) as the excitation voltage V m.est .

17. The primary side feedback excitation power supply controller according to claim 16, characterized in that: The current operation circuit includes: A third operational amplifier is electrically connected to the second operational amplifier and the primary control circuit, and is used to obtain the excitation inductance L calculated by the primary control circuit. m.est The reciprocal of the excitation voltage V m.est The product of The integrator is electrically connected to the third operational amplifier and is used to m.est Integrate to obtain the excitation current I m.est ; A fourth operational amplifier is electrically connected to the integrator and the acquisition circuit, and is used to calculate the input current Ir and the excitation current I m.est The difference is taken as the primary current I pri.est .

18. The primary side feedback excitation power supply controller according to claim 17, characterized in that: The output voltage and current operation circuit includes: A fifth operational amplifier, electrically connected to the second operational amplifier, is used to calculate the excitation voltage V m.est The absolute value of V m.est |; A first low-pass filter is electrically connected to the fifth operational amplifier and is used to calculate the excitation voltage V m.est The average value of the absolute value of V m.est | avg ; A sixth operational amplifier is electrically connected to the fourth operational amplifier and is used to calculate the primary current I pri.est The absolute value of |I pri.est |; A second low-pass filter is electrically connected to the sixth operational amplifier and is used to calculate the primary current I pri.est The average of the absolute values ​​of |I pri.est | avg ; an operational processing circuit, electrically connected to the fifth operational amplifier, the first low-pass filter, the sixth operational amplifier, and the second low-pass filter; When the primary side control circuit determines that f sw ≥f r When the arithmetic processing circuit is used to calculate the excitation voltage V in a switching cycle T of the bridge circuit, m.est Average value of absolute value|V m.est | avg , the primary current I pri.est Average of absolute values ​​|I pri.est | avg , and the turns ratio K of the primary winding and the secondary winding of the transformer, calculate the output voltage V of the resonant power supply o.est and output current I o.est ; in, When the primary side control circuit determines that f sw <f r When the operation processing circuit is used to obtain the primary current I from the plurality of primary currents I in half a switching cycle T of the bridge circuit, pri.est The absolute value of |I pri.est |The primary current I is obtained from pri.est Peak absolute value |I pri.est | max , and the peak value |I pri.est | max Match the absolute value of the excitation voltage |V m1 |, and according to the primary current I pri.est Average of absolute values ​​|I pri.est | avg , and the turns ratio K of the primary winding and the secondary winding of the transformer, calculate the output voltage V of the resonant power supply o.est and output current I o.est ; in, 19. A control method for the primary side feedback excitation power supply controller according to any one of claims 10 to 18, characterized in that: The control method includes: Calculate the excitation inductance L m.est , according to the input voltage Vt, the input current I r , the leakage inductance L of the primary winding lk1 And the calculated excitation inductance L m.est , calculate the output voltage V of the resonant power supply o.est and output current I o.est ; A driving signal is output to the bridge circuit.

20. The control method of the primary side feedback excitation power supply controller according to claim 19, characterized in that: The calculated excitation inductance L m.est , according to the input voltage Vt, the input current I r , the leakage inductance L of the primary winding lk1 And the calculated excitation inductance L m.est , calculate the output voltage V of the resonant power supply o.est and output current I o.est include: Collect the input voltage V t and the input current I r ; Calculate the magnetizing inductance L m.est and the leakage inductance L of the primary winding lk1 And the calculated excitation inductance L m.est transmitted to the feedback circuit; According to the input voltage V t , the input current I r , the leakage inductance L of the primary winding lk1 And the calculated excitation inductance L m.est , calculate the excitation voltage V m.est , excitation current I m.est and the primary current I pri.est ; in, I pri.est =I r -I m.est ; According to the calculated excitation voltage V m.est , the primary current I pri.est Calculate the output voltage V of the resonant power supply o.est and output current I o.est .

21. The control method of the primary side feedback excitation power supply controller according to claim 20, characterized in that: The inductance of the resonant inductor in the LC series resonant network is L r , the capacitance of the resonant capacitor is C r ; The control method further includes: calculating the oscillation frequency f of the bridge circuit r ; in, The calculation of the excitation inductance L m.est include: The operating frequency f of the bridge circuit sw With the oscillation frequency f r For comparison, when f sw <f r When the switching period T of the bridge circuit is T, the cal The absolute value of the excitation current calculated by the feedback circuit in the current switching cycle T of the bridge circuit |I m.est |The absolute value of the input current|I r | Make a comparison; When|I m.est |>|I r |When the bridge circuit is in the current switching cycle T, the excitation inductance L received by the feedback circuit m.est Increase, so that |I m.est |=|I r |, and output to the feedback circuit; When|I m |<|I r |When the bridge circuit is in the current switching cycle T, the excitation inductance L received by the feedback circuit m.est Reduce, so that |I m.est |=|I r |, and output to the feedback circuit; When|I m.est |=|I r |When the bridge circuit is in the current switching cycle T, the excitation inductance L received by the feedback circuit m.est output to the feedback circuit; Among them, T cal =T / 2-T f / 2, T f =1 / f r .

22. The control method of the primary side feedback excitation power supply controller according to claim 20, characterized in that: The calculation of the excitation inductance L m.est include: Determine the primary current I calculated by the feedback circuit pri.est When the excitation inductance L received by the feedback circuit in the current switching cycle T of the bridge circuit is zero, m.est output to the feedback circuit.

23. The control method of the primary side feedback excitation power supply controller according to claim 21 or 22, characterized in that: When f sw ≥f r When the excitation voltage V is calculated according to m.est , the primary current I pri.est Calculate the output voltage V of the resonant power supply o.est and output current I o.est include: Calculate the excitation voltage V within one switching cycle T of the bridge circuit. m.est Average value of absolute value|V m.est | avg , the primary current I pri.est Average of absolute values ​​|I pri.est | avg ; And according to the excitation voltage V m.est Average value of absolute value|V m.est | avg , the primary current I pri.est Average of absolute values ​​|I pri.est | avg , and the turns ratio K of the primary winding and the secondary winding of the transformer, calculate the output voltage V of the resonant power supply o.est and output current I o.est ; in, 24. The control method of the primary side feedback excitation power supply controller according to claim 21 or 22, characterized in that: When f sw <f r When the excitation voltage V is calculated according to m.est , the primary current I pri.est Calculate the output voltage V of the resonant power supply o.est and output current I o.est include: In one switching cycle T of the bridge circuit, the primary current I is calculated pri.est Average of absolute values ​​|I pri.est | avg , and in half of the switching cycle T, continuously obtain multiple excitation voltages V m.est The absolute value of V m.est | and multiple primary currents I pri.est The absolute value of |I pri.est |; From the multiple primary current I pri.est The absolute value of |I pri.est |, the primary current I pri.est Peak value of absolute value|I pri.est | max , and the peak value |I pri.est | max Match the absolute value of the excitation voltage |V m1 |; According to the primary current I pri.est Peak value of absolute value|I pri.est | max , and the peak value |I pri.est | max Match the absolute value of the excitation voltage |V m1 |, the primary current I pri.est Average of absolute values ​​|I pri.est | avg And the turns ratio K of the transformer primary winding and secondary winding, calculate the output voltage V o.est and output current I o.est ; in, 25. A control device, characterized in that: The device comprises a load and the resonant power supply according to any one of claims 1 to 9, wherein the resonant power supply is electrically connected to the load.

26. The control device according to claim 25, characterized in that The load includes an electric excitation winding; The control device further comprises: a rotating shaft connected to the electric excitation winding; The armature winding is electrically connected to the electric excitation winding and the primary feedback excitation power supply controller in the resonant power supply, and is used to generate a rotating magnetic field to drive the shaft to rotate. The armature winding is also used to generate the output voltage V of the resonant power supply calculated by the primary feedback excitation power supply controller. o.est and output current I o.est , and the output voltage and output current of the resonant power supply preset in the primary feedback excitation power supply controller, control the primary feedback excitation power supply controller to output the driving signal.

27. A computer-readable storage medium, characterized in that It includes computer instructions, which, when executed on a primary-side feedback excitation power supply controller, enable the primary-side feedback excitation power supply controller to execute the control method according to any one of claims 19 to 24.

28. A computer program product, characterized in that It includes computer instructions, which, when executed on a primary-side feedback excitation power supply controller, enable the primary-side feedback excitation power supply controller to execute the control method according to any one of claims 19 to 24.

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