Output control circuit, output control method, and welding device

Abstract

The invention relates to the technical field of control circuits, in particular to an output control circuit, an output control method and a welding device with the output control circuit. The output control circuit can achieve high-precision automatic output control, so that when the output control circuit is applied to the welding device, the welding device can achieve more uniform wave height distribution in the welding flux spraying process, and high-precision and high-density welding flux installation is achieved. The output control circuit comprises a first instruction unit, a second instruction unit, an output control unit, an output module and an output current detection unit. The first instruction unit outputs a first instruction; the second instruction unit outputs a second instruction; the output control unit receives the first instruction and the second instruction and outputs a control signal; the output module adjusts the voltage value of the output signal according to the control signal; the input end of the output current detection unit is connected with the output end of the output module, and the output end is connected with the input end of the first instruction unit.

Description

Technical Field

[0001] The present invention relates to the technical field of control circuits, and in particular to an output control circuit, an output control method, and a welding device equipped with the output control circuit. Background Art

[0002] Wave soldering is a common process for soldering plug-in components. It works by pumping molten solder into a designed solder wave through an electric or electromagnetic pump. This wave is then passed over a pre-installed printed circuit board (PCB), creating a mechanical and electrical connection between the component terminals or pins and the PCB. The quality of soldering performed by the equipment is closely related to the wave soldering process parameters.

[0003] In the prior art, the output control circuit of the welding device is as follows Figure 1 The command unit 101 receives an external command signal and transmits a frequency command to the output control unit 102. The output control unit 102 adjusts the operating frequency and voltage of the output unit 103 according to the frequency command. The output unit 103 is configured as a power converter and is connected to the electromagnetic pump 104 in the welding device to provide power to the electromagnetic pump 104.

[0004] However, the V / f control method in the above-mentioned prior art is only applicable to situations where the control accuracy requirement is low. When adjusting the wave height distribution of the solder jet of the welding equipment and the solder temperature in the solder tank, it is necessary to achieve a more uniform wave height distribution during the solder jet process to achieve high-precision and high-density solder installation. This is the problem in the prior art. Figure 1 The output control circuit shown cannot meet the requirements. Summary of the Invention

[0005] To address the above issues, the present invention provides an output control circuit, an output control method, and a soldering device equipped with the output control circuit. The output control circuit enables high-precision, automated output control. When applied to a soldering device, the output control circuit enables a more uniform wave height distribution during solder spraying, enabling high-precision, high-density solder placement.

[0006] The technical solution of the present invention provides an output control circuit, comprising a first instruction unit, a second instruction unit, an output control unit, an output module, and an output current detection unit. The first instruction unit outputs a first instruction; the second instruction unit outputs a second instruction; the output control unit receives the first and second instructions and outputs a control signal; the output module adjusts the voltage value of the output signal based on the control signal from the output control unit; the output current detection unit has an input connected to the output of the output module, and its output connected to the input of the first instruction unit.

[0007] According to the technical solution of the present invention, the first instruction unit issues a first instruction with reference to the output current detection signal detected by the output current detection unit. This allows feedback control to be performed with reference to the detected current output current value, allowing the first instruction unit to adjust the output first instruction signal in real time in response to the detected current output current value, thereby ensuring that the output current of the output module remains stable at a preset value. Furthermore, by independently receiving different external instructions from the first instruction unit and the second instruction unit, the voltage value of the output signal of the output module is adjusted using different parameters, thereby improving the control response effect and response speed of the output signal.

[0008] Preferably, in the technical solution of the present invention, the output control circuit further includes a current command setting unit and a frequency command setting unit, wherein the output end of the current command setting unit is connected to the input end of the first command unit; and the output end of the frequency command setting unit is connected to the input end of the second command unit. The first command unit receives the target current control signal from the current command setting unit and the output current detection signal from the output current detection unit, and outputs the first command in the form of a voltage control signal; the second command unit outputs the second command in the form of a frequency control signal.

[0009] According to the technical solution of the present invention, the current command setting unit transmits the target current control signal to the first command unit, and the output current detection unit also transmits the real-time output current detection signal to the first command unit. The first command unit can compare and determine whether the real-time output current is consistent with the target current. Based on the comparison and determination result, it outputs a first command to the output control unit to adjust the voltage value of the output module so that the output current value of the output module always matches the target current value, achieving high-precision and automatic control of the current value of the output signal. On the other hand, independently of the first command unit, the frequency command setting unit transmits the target frequency control signal to the second command unit to achieve regulation and control of the operating frequency of the output module. Thus, the operating frequency and output current of the output module are separately regulated and controlled, the adjustment response speed of the output signal in the output control circuit is improved, and the output control circuit can achieve high-precision and automated output control.

[0010] Preferably, in the technical solution of the present invention, the output control unit in the output control circuit further includes an output voltage compensation unit, which is used to perform output voltage compensation control or automatic voltage regulation control to suppress fluctuations in the DC intermediate voltage.

[0011] In the technical solution of the present invention, the output module in the output control circuit is configured as a power converter, which is used to implement regulation control of a DC voltage signal to an AC output signal.

[0012] In the technical solution of the present invention, the output control circuit also includes an input module connected to the input terminal of the power converter. The input module includes a rectifier unit, a smoothing capacitor, and an input suppression unit. The rectifier unit is connected to an external AC input signal; the smoothing capacitor is connected to the rectifier unit; and the input suppression unit is connected between the rectifier unit and the smoothing capacitor.

[0013] According to the technical solution of the present invention, the rectifier unit rectifies the external AC input signal, which is then modulated by the input suppression unit and smoothing capacitor to generate a DC voltage signal. The DC voltage signal is then transmitted to the power converter, which inverts the signal for output.

[0014] Preferably, in the technical solution of the present invention, the output control circuit further includes a DC voltage detection unit connected to the input end of the power converter, and the output voltage compensation unit is connected to the DC voltage detection unit.

[0015] According to the technical solution of the present invention, the DC voltage detection unit is used to detect the DC voltage signal transmitted to the output module, and transmit the detected DC voltage detection signal to the output voltage compensation unit.

[0016] Preferably, in the technical solution of the present invention, the first instruction unit includes at least one of a proportional integral unit, a proportional integral differential unit, an operational amplifier, and a voltage regulator, which can be used to perform a comparison operation between the target current control signal and the output current detection signal, and output the first instruction based on the result of the comparison operation.

[0017] In the technical solution of the present invention, an output control method is also provided, including: a first instruction sending step, sending a first instruction; a second instruction sending step, sending a second instruction; a control signal sending step, outputting a control signal according to the first instruction and the second instruction; an output step, adjusting the voltage value of the output signal according to the control signal; an output current detection step, detecting the output current output by the output step and sending an output current detection signal, wherein the first instruction is generated according to the output current detection signal.

[0018] According to the technical solution of the present invention, a first instruction generated based on the output current detection signal simultaneously references and compares an external current instruction and an internal feedback current, enabling stable feedback control of the output signal of the output control circuit. Furthermore, by receiving different external instructions through the mutually independent first and second instructions, the voltage value of the output signal is adjusted using different parameters, thereby improving the control response effect and response speed of the output signal.

[0019] Preferably, in the technical solution of the present invention, the output control method also includes: a current value comparison step, comparing the real-time output current detection signal detected by the output current detection step with the target current control signal; a first instruction sending step, outputting the first instruction in the form of a voltage control signal based on the comparison result of the current value comparison step.

[0020] According to the technical solution of the present invention, it is possible to determine whether the output current detection signal is consistent with the target current control signal by comparison, and output a first instruction based on the result of the comparison and judgment to control the voltage value of the output signal, so that the output current of the output module always matches the target current, thereby achieving high-precision automatic control of the current value of the output signal.

[0021] Preferably, in the technical solution of the present invention, the output control method also includes: a DC voltage detection step, detecting the input voltage when executing the output step, and outputting the detected DC voltage detection signal; an output control step, adjusting the control signal of the control signal sending step according to the received DC voltage detection signal, the first instruction and the second instruction.

[0022] According to the technical solution of the present invention, the DC voltage detection signal is detected and used as a reference parameter for voltage control to perform output voltage compensation control or automatic voltage regulation control to suppress fluctuations in the DC intermediate voltage, making the output signal more stable.

[0023] In the technical solution of the present invention, a soldering device is also provided, comprising an electromagnetic pump for wave soldering and the above-mentioned output control circuit, wherein the output end of the output module in the output control circuit is connected to the electromagnetic pump.

[0024] According to the technical solution of the present invention, the output signal of the output module in the above-mentioned output control circuit can achieve stable control and efficient response. When the output control circuit is used to power the electromagnetic pump in the welding device, the stable output current control can ensure that the electromagnetic pump has a stable jet flow to form a smooth solder wave, and can improve the response speed of the solder from a low temperature to a set temperature, thereby realizing high-precision and high-density welding installation of the welding device. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a schematic diagram of an output control circuit of a welding device provided in the prior art.

[0026] Figure 2 It is a waveform diagram of the output control circuit of the welding device provided in the prior art.

[0027] Figure 3 is a schematic diagram of an output control circuit provided in the first embodiment of the present invention.

[0028] Figure 4 is a schematic diagram of an output control circuit provided in a second embodiment of the present invention.

[0029] Figure 5 is a waveform diagram of an output control circuit provided in the second embodiment of the present invention.

[0030] Figure 6 is a schematic diagram of an output control circuit provided in a third embodiment of the present invention.

[0031] FIG. 7( a ) is a waveform diagram provided in the third embodiment of the present invention without an output voltage compensation unit.

[0032] FIG7( b ) is a waveform diagram of a device provided with an output voltage compensation unit according to the third embodiment of the present invention.

[0033] Figure 8 is a flowchart of an output control method provided in the fourth embodiment of the present invention.

[0034] Description of reference numerals:

[0035] 101-command unit, 102-output control unit, 103-output unit, 104-electromagnetic pump, 100-output control circuit, 1-first command unit, 2-second command unit, 3-output control unit, 31-output voltage compensation unit, 4-output module, 5-output current detection unit, 6-current command setting unit, 7-frequency command setting unit, 8-input module, 81-rectifier unit, 82-smoothing capacitor, 83-input suppression unit, 9-DC voltage detection unit, 200-electromagnetic pump. DETAILED DESCRIPTION

[0036] First of all, it should be noted that the following will illustrate the composition, working principle, characteristics and advantages of the output control circuit, output control method and welding device according to the present invention in an illustrative manner. However, it should be understood that all descriptions are given for illustration only and should not be construed as limiting the present invention in any way.

[0037] In addition, for any single technical feature described or implied in the embodiments mentioned in this document, or any single technical feature shown or implied in the accompanying drawings, this application still allows for continued arbitrary combination or deletion between these technical features (or their equivalents) without any technical obstacles, thereby obtaining more other embodiments of the present application that may not be directly mentioned in this document.

[0038] like Figure 1As shown, the output control circuit of a conventional welding device uses a constant voltage-to-frequency (V / f) mode for control. The voltage of the output signal increases with increasing frequency. According to the inductive reactance principle: i = V / ωL = V / (2πf × L), where i is the current, V is the voltage, and f is the frequency, the current of the output signal varies with both the voltage and frequency, with the current being positively correlated with the voltage and negatively correlated with the frequency.

[0039] Figure 2 It is a waveform diagram of the output control circuit of the welding device provided in the prior art.

[0040] like Figure 2 As shown, at time t1, the switch command is on, and the output control circuit begins operating. At this time, the frequency command issued by command unit 101 is 30 Hz, and output control unit 102 obtains a corresponding voltage command V1 based on the frequency command. After a period of time, at time t2, the output frequency of output unit 103 reaches 30 Hz, the output voltage reaches V1, and the output current reaches i1. At time t3, the frequency command issued by command unit 101 is adjusted to 60 Hz, and output control unit 102 obtains a corresponding voltage command V2 based on the frequency command. After a further period of time, at time t4, the output frequency of output unit 103 reaches 60 Hz, the output voltage reaches V2, and the output current reaches i2. At time t5, the frequency command issued by command unit 101 returns to 30 Hz, and output control unit 102 obtains a corresponding voltage command V3 based on the frequency command. After a further period of time, at time t6, the output frequency of output unit 103 reaches 30 Hz, the output voltage reaches V3, and the output current remains at i2. When time T is t7, the switch command is OFF, the output control circuit stops running, and the parameters of the output control circuit return to zero.

[0041] In this way, when the output signal of output unit 103 is controlled by frequency instructions, there will be a certain delay (such as t1-t2, t3-t4, t5-t6) from issuing the instruction to outputting the corresponding signal, and the output control circuit cannot respond in time. Moreover, the V / f control mode itself is only suitable for applications with low control accuracy requirements and cannot meet high-precision control requirements.

[0042] [First embodiment]

[0043] Figure 3 is a schematic diagram of an output control circuit provided in the first embodiment of the present invention.

[0044] like Figure 3As shown, in a first embodiment of the present invention, an output control circuit 100 is provided, including a first instruction unit 1, a second instruction unit 2, an output control unit 3, an output module 4 and an output current detection unit 5. The output control circuit 100 is used to control the output signal of a circuit or device such as a power supply circuit.

[0045] The output module 4 is connected to an external circuit / device (not shown) and is used to output signals to the external circuit / device and provide power to the external circuit / device. The output control unit 3 is connected to the output module 4 and can send control signals to the output module 4 to control the operating parameters of the output module 4, thereby controlling the output signal of the output module 4. The first instruction unit 1 and the second instruction unit 2 are configured as independent instruction receiving and sending units, which can respectively receive and send different control instructions; the output control unit 3 generates a control signal based on the control instructions transmitted by the first instruction unit 1 and the second instruction unit 2, and sends the control signal to the output module 4.

[0046] Furthermore, the input end of the output current detection unit 5 is connected to the output end of the output module 4. The output current detection unit 5 is used to detect the current value of the output signal sent by the output module 4 to the external circuit / device. The output end of the output current detection unit 5 is connected to the input end of the first instruction unit 1.

[0047] According to the above-mentioned circuit structure of the first embodiment of the present invention, the first instruction unit 1 can issue a first instruction based on the current output current detection signal detected by the output current detection unit 5, that is, feedback control can be performed with reference to the current real-time current value of the output signal, so that the first instruction unit 1 can respond to the current output current detection signal fed back by the output current detection unit 5, and adjust the first instruction signal output by the first instruction unit 1 in real time, so that the actual output current value is stably controlled at a preset value.

[0048] Moreover, because the first instruction unit 1 and the second instruction unit 2 are independent of each other, the output control unit 3 can receive different external instructions respectively through the independent first instruction unit 1 and the second instruction unit 2, thereby adjusting the output signal of the output module 4 through different parameters, thereby improving the control response effect and response speed of the output signal.

[0049] In the embodiment of the present invention, the output current detection unit 5 may be configured as a circuit or an integrated chip composed of one or more elements such as a current detection element, an operational amplifier, a comparator, etc., which is not limited here.

[0050] [Second embodiment]

[0051] Figure 4 is a schematic diagram of an output control circuit provided in a second embodiment of the present invention.

[0052] like Figure 4 As shown, in a second embodiment of the present invention, an output control circuit 100 is provided, which includes a first instruction unit 1 , a second instruction unit 2 , an output control unit 3 , an output module 4 and an output current detection unit 5 .

[0053] On the basis of the output control circuit 100 provided in the first embodiment, the output control circuit 100 provided in the second embodiment further includes a current command setting unit 6 , a frequency command setting unit 7 and an input module 8 .

[0054] First, in the second embodiment of the present invention, the output module 4 is configured as a power converter for implementing regulation and control of a DC voltage signal to an AC output signal. The input module 8 is connected to the output module 4, i.e., the input end of the power converter. The input module 8 includes a rectifier unit 81, a smoothing capacitor 82, and an input suppression unit 83. The rectifier unit 81 is connected to the external AC input signal ( Figure 4 As shown in RST), the smoothing capacitor 82 is connected to the rectifying unit 81, and the input suppression unit 83 is connected between the rectifying unit 81 and the smoothing capacitor 82.

[0055] The rectifier unit 81 rectifies the external AC input signal, which is then modulated by the input suppression unit 82 and smoothing capacitor 83 to generate a DC voltage signal. The DC voltage signal is then transmitted to the output module 4, which inverts the signal into a power converter.

[0056] Secondly, in the second embodiment of the present invention, the current instruction setting unit 6 transmits the target current control signal to the first instruction unit 1, and the output current detection unit 5 transmits the real-time detected output current detection signal to the first instruction unit 1. The first instruction unit 1 can compare and determine whether the real-time output current value of the output module 4 detected matches the target current value of the target current control signal sent by the current instruction setting unit 6, and output the first instruction of the control voltage to the output control unit 3 based on the result of the comparison and judgment, so as to control the voltage value output by the output module 4, so that the output current of the output module 4 matches the target current, thereby realizing high-precision automatic control of the current value of the output signal.

[0057] At the same time, on the other hand, the frequency instruction setting part 7 transmits the target frequency control signal to the second instruction unit 2. The second instruction unit 2 outputs the second instruction of the control frequency according to the target frequency control signal from the frequency instruction setting part 7, thereby realizing the regulation and control of the working frequency of the output module 4.

[0058] In this way, according to the second embodiment of the present invention, because the first instruction unit 1 and the second instruction unit 2 independently send the first instruction and the second instruction to the output control unit 3 according to the target current control signal from the current instruction setting unit 6 and the target frequency control signal from the frequency instruction setting unit 7, respectively, to realize the control of the output of the power converter serving as the output module 4, and the first instruction output by the first instruction unit 1 is made on the basis of whether the detected real-time output current value of the output module 4 matches the target current value of the target current control signal sent by the current instruction setting unit 6, therefore, the voltage control signal serving as the first instruction can be adjusted independently of the target frequency control signal to ensure that the output current of the output module 4 is consistent with the target current, so as to realize high-precision automatic control of the current value of the output signal.

[0059] In an embodiment of the present invention, the first command unit 1 and the second command unit 2 can be configured as a circuit or chip formed by a combination of one or more components. The output end of the current command setting unit 6 is connected to the input end of the first command unit 1, and the output end of the frequency command setting unit 7 is connected to the input end of the second command unit 2. In this embodiment, the current command setting unit 6 and the frequency command setting unit 7 are configured as interface chips installed at the input ends of the first command unit 1 and the second command unit 2, respectively. In other embodiments of the present invention, the current command setting unit 6 and the frequency command setting unit 7 can also be independent unit structures.

[0060] Preferably, in the second embodiment of the present invention, the first instruction unit 1 includes a proportional-integral unit 11. The first instruction unit 1 receives the target current control signal from the current instruction setting unit 6 and the real-time output current detection signal detected by the output current detection unit 5, and performs a proportional-integral operation based on the difference between the two to obtain a first instruction in the form of a voltage control signal. For example, when the current value of the output current detection signal is less than the current value of the target current control signal, the proportional-integral unit 11 adjusts and controls the output voltage to increase so as to quickly increase the output current and make it approach the current value of the target current control signal; and when the current value of the output current detection signal is greater than the current value of the target current control signal, the proportional-integral unit 11 adjusts and controls the output voltage to decrease so as to quickly reduce the output current and make it approach the current value of the target current control signal. Thus, the output current of the output module 4 is adjusted to follow the target current in real time and quickly change and adjust to be consistent with the target current, thereby realizing automatic and high-speed regulation of the output current.

[0061] It is worth mentioning that in other embodiments of the present invention, the first instruction unit 1 can also be at least one of a proportional integral differential unit, an operational amplifier, and a voltage regulator. As long as it can be used to perform a comparison operation between the target current control signal and the output current detection signal, and output a voltage control signal according to the result of the comparison operation, there is no restriction here.

[0062] As described above, in the second embodiment of the present invention, the frequency and voltage are controlled by the independent first instruction unit 1 and the second instruction unit 2 respectively. The specific control process is as follows: Figure 5 shown.

[0063] Figure 5 is a waveform diagram of an output control circuit provided in the second embodiment of the present invention.

[0064] like Figure 5 As shown, when time T is t1, the switch instruction is ON, the output control circuit 100 starts to run, the target frequency control signal received by the second instruction unit 2 is 30 Hz, and the second instruction unit 2 outputs the second instruction in the form of a frequency control signal; the target current control signal received by the first instruction unit 1 is 1.5 A, and the first instruction unit 1 outputs the first instruction in the form of a corresponding voltage control signal according to the target current control signal.

[0065] During the t1-t2 time period, the output frequency, output voltage, and output current of the output module 4 begin to change. When the output current is generated, the output current detection unit 5 detects the output current detection signal and feeds it back to the first instruction unit 1. When the first instruction unit 1 determines that the real-time output current detection signal is less than the target current control signal 1.5A, the first instruction unit 1 outputs a first instruction to control the output voltage to increase rapidly with a large amplitude, thereby quickly increasing the output voltage and output current of the output module 4; similarly, when the first instruction unit 1 determines that the output current detection signal is greater than the target current control signal 1.5A, the first instruction unit 1 outputs a first instruction to control the output voltage to decrease rapidly with a large amplitude, thereby quickly reducing the output voltage and output current of the output module 4; through rapid and multiple feedback adjustments, the output current of the output module 4 can reach the target current (1.5A) in a shorter time, thereby improving the response speed of current and frequency regulation.

[0066] At time t3, the target frequency control signal received by the second command unit 2 remains at 30 Hz, while the target current control signal received by the first command unit 1 changes to 2.5 A. During the time period t3-t4, rapid, multiple feedback adjustments allow the output current of the output module 4 to reach the target current (2.5 A) in a relatively short period of time.

[0067] When time T reaches t5, the target frequency control signal received by the second instruction unit 2 changes to 60Hz; however, the target current control signal received by the first instruction unit 1 remains at 2.5A. In the time period t5-t6, the output frequency of the output module 4 is rapidly increased while the output current remains unchanged. When time T reaches t7, the target frequency control signal received by the second instruction unit 2 changes to 30Hz; while the target current control signal received by the first instruction unit 1 remains at 2.5A. In the time period t7-t8, the output frequency of the output module 4 is rapidly reduced while the output current remains unchanged. When time T reaches t9, the switch instruction is OFF, the output control circuit 100 stops running, and the parameters of the output control circuit 100 are reset to zero.

[0068] Combination of the above Figure 5 , the specific control process of the output control circuit 100 of the second embodiment of the present invention is exemplified, but it should be noted that the various numerical values ​​involved in the description are only examples and do not constitute any limitation to the present invention.

[0069] Compared to existing technologies that rely solely on V / f control, the output control circuit 100 in this embodiment can independently regulate and control the operating frequency and output current of the output module 4, significantly improving the output signal regulation response speed of the output control circuit 100. The output control circuit 100 can achieve high-precision, automated output control. Furthermore, through output current feedback, the actual output signal of the output module 4 can be guaranteed to always match the desired output signal (i.e., the target signal), maintaining a stable output current. Consequently, when the output control circuit 100 is applied to a welding device, it can achieve a more uniform wave height distribution during the solder jetting process, enabling high-precision, high-density solder installation.

[0070] In a second embodiment of the present invention, a welding device (not shown) is also provided, including an electromagnetic pump 200 for wave soldering and the above-mentioned output control circuit 100, wherein the output end of the output module 4 in the output control circuit 100 is connected to the electromagnetic pump 200.

[0071] The output signal of the output module 4 in the above-mentioned output control circuit 100 can achieve stable control and efficient response. When the output control circuit 100 is used to power the electromagnetic pump 200 in the welding device, the stable output current control can ensure that the electromagnetic pump has a stable jet flow to form a smooth solder wave, and can improve the response speed of the solder from a low temperature to a set temperature, thereby realizing high-precision and high-density welding installation of the welding device.

[0072] [Third embodiment]

[0073] Figure 6 is a schematic diagram of an output control circuit provided in a third embodiment of the present invention.

[0074] like Figure 6 As shown, in the third embodiment of the present invention, based on the output control circuit 100 provided in the first embodiment or the second embodiment, the output control circuit 100 further includes a DC voltage detection unit 9 and an output voltage compensation unit 31.

[0075] In the third embodiment of the present invention, the DC voltage detection unit 9 is connected to the input end of the output module 4 and is used to detect the DC voltage signal transmitted to the output module 4. The output voltage compensation unit 31 is provided in the output control unit 3 and is connected to the DC voltage detection unit 9.

[0076] In this embodiment of the present invention, input module 8 and output module 4 form an AC transformer circuit. Input module 8 rectifies an external AC signal into a DC signal, and output module 4 inverts the DC signal into an output AC signal with specified operating parameters. During the aforementioned AC-DC-AC conversion process, the DC voltage may experience rapid fluctuations in its effective value due to environmental factors, interference, and other factors, resulting in DC voltage fluctuations.

[0077] FIG. 7 is a waveform diagram of an output control circuit provided in the third embodiment of the present invention.

[0078] 7( a ) is a waveform diagram without the output voltage compensation unit, and FIG. 7( b ) is a waveform diagram with the output voltage compensation unit.

[0079] As shown in FIG7(a), without the aforementioned DC voltage detection unit 9 and output voltage compensation unit 31, when the DC intermediate voltage fluctuates between time ta and tb, the DC voltage value increases, and the output voltage and output current of the output module 4 also increase accordingly. When the DC intermediate voltage fluctuates between time tc and td, the DC voltage value decreases, and the output voltage and output current of the output module 4 also decrease. Thus, sudden changes in the DC intermediate voltage can cause sudden changes in the output voltage and output current of the output control circuit 100, making it impossible for the output control circuit 100 to provide a stable supply current when powering equipment such as welding devices.

[0080] As shown in FIG7( b ), in a third embodiment of the present invention, a DC voltage detection unit 9 and an output voltage compensation unit 31 are provided in the output control circuit 100. When the DC intermediate voltage fluctuates between the time intervals ta and tb, the DC voltage value increases. The DC voltage detection unit 9 transmits the detected DC voltage detection signal to the output voltage compensation unit 31. The output control unit 3 can reduce the duty cycle or other parameters of the output module 4 so that the output voltage of the output module 4 remains unchanged even when the input DC voltage increases. Similarly, when the DC intermediate voltage fluctuates between the time intervals tc and td, the DC voltage value decreases. The DC voltage detection unit 9 transmits the detected DC voltage detection signal to the output voltage compensation unit 31. In this case, the output control unit 3 can increase the duty cycle or other parameters of the output module 4 so that the output voltage of the output module 4 remains unchanged even when the input DC voltage decreases.

[0081] In this embodiment, the DC voltage detection unit 9 transmits the detected DC voltage signal to the output voltage compensation unit 31. The output voltage compensation unit 31 performs output voltage compensation control or automatic voltage regulation to suppress fluctuations in the DC intermediate voltage, thereby achieving a stable output signal. When powering equipment such as a welding device, the output control circuit 100 provides a stable output current to the solenoid valve 200, enabling the welding device to achieve a more uniform wave height distribution during the solder spraying process, thereby achieving high-precision, high-density solder installation.

[0082] [Fourth embodiment]

[0083] Figure 8 is a flowchart of an output control method provided in the fourth embodiment of the present invention.

[0084] like Figure 8 As shown, in a fourth embodiment of the present invention, an output control method is further provided, which is applied to the output control circuit described in the above embodiment. The output control method includes: a first instruction sending step S1, sending a first instruction; a second instruction sending step S2, sending a second instruction; a control signal sending step S3, outputting a control signal according to the first instruction and the second instruction; an output step S4, adjusting the voltage value of the output signal according to the control signal; and an output current detection step S5, detecting the output current output by the output step S4 and sending an output current detection signal, wherein the first instruction is generated based on the output current detection signal.

[0085] In the fourth embodiment of the present invention, a first instruction is generated by referring to the output current detection signal fed back from the output current detection step S5, and by comparing the external instruction with the internal feedback current, so that the output signal of the output control circuit can achieve stable feedback control. Furthermore, by receiving and sending different external instructions through the independent first instruction sending step S1 and second instruction sending step S2, the voltage value of the output signal can be adjusted using different parameters, thereby improving the control response effect and response speed of the output signal.

[0086] Preferably, in the fourth embodiment of the present invention, the output control method also includes a current value comparison step S6 (not shown), which compares the output current detection signal detected by the output current detection step S5 with the target current control signal; and the first instruction sending step S1 outputs the first instruction in the form of a voltage control signal based on the comparison result of the current value comparison step S6.

[0087] Through the above-mentioned current value comparison step S6, it is compared and determined whether the output current detection signal matches the target current control signal, and a first instruction is output according to the result of the comparison and judgment to control the voltage value of the output signal so that the output current of the output module always matches the target current, thereby achieving high-precision automatic control of the current value of the output signal.

[0088] Furthermore, in the fourth embodiment of the present invention, the output control method also includes: a DC voltage detection step S7 (not shown), detecting the input voltage when executing the output step S4, and outputting the detected DC voltage detection signal; an output control step S8 (not shown), adjusting the control signal of the control signal sending step S3 based on the received DC voltage detection signal, the first instruction and the second instruction.

[0089] Through the above steps, the DC voltage detection signal is detected and used as a reference parameter for voltage control, and output voltage compensation control or automatic voltage regulation control is performed to suppress fluctuations in the DC intermediate voltage, making the output signal more stable.

[0090] The technical solutions of the present invention have been described above with reference to the accompanying drawings. However, it will be readily understood by those skilled in the art that the scope of protection of the present invention is not limited to the above-described specific embodiments. Without departing from the principles of the present invention, those skilled in the art may make equivalent modifications or substitutions to the relevant technical features, and the technical solutions after such modifications or substitutions will fall within the scope of protection of the present invention.

Claims

1. An output control circuit comprising: A first instruction unit outputs a first instruction; A second instruction unit outputs a second instruction; an output control unit, receiving the first instruction and the second instruction, and outputting a control signal; An output module, which adjusts the voltage value of the output signal according to the control signal; Characterized in that the output control circuit further includes: An output current detection unit has an input end connected to the output end of the output module, and an output end connected to the input end of the first instruction unit.

2. The output control circuit according to claim 1, wherein: Also includes, a current instruction setting unit, an output end of which is connected to the input end of the first instruction unit; a frequency instruction setting unit, an output end of which is connected to the input end of the second instruction unit; in, The first instruction unit receives the target current control signal from the current instruction setting unit and the output current detection signal from the output current detection unit, and outputs the first instruction in the form of a voltage control signal; The second instruction unit outputs the second instruction in the form of a frequency control signal.

3. The output control circuit according to claim 2, characterized in that: The output control unit includes an output voltage compensation unit.

4. The output control circuit according to claim 3, characterized in that: The output module is configured as a power converter.

5. The output control circuit according to claim 4, characterized in that: The device further includes an input module connected to the input terminal of the power converter, wherein the input module includes: Rectifier unit, connected to external AC input signal; a smoothing capacitor connected to the rectifier unit; The input suppression unit is connected between the rectifying unit and the smoothing capacitor.

6. The output control circuit according to claim 5, characterized in that: It also includes a DC voltage detection unit connected to the input end of the power converter, and the output voltage compensation unit is connected to the DC voltage detection unit.

7. The output control circuit according to claim 2, wherein: The first instruction unit includes at least one of a proportional integral unit, a proportional integral differential unit, an operational amplifier, and a voltage regulator.

8. An output control method comprising: A first instruction sending step of sending a first instruction; A second instruction sending step of sending a second instruction; a control signal sending step of outputting a control signal according to the first instruction and the second instruction; an output step, adjusting a voltage value of an output signal according to the control signal; It is characterized by also including: An output current detection step is to detect the output current output by the output step and send an output current detection signal, and the first instruction is generated according to the output current detection signal.

9. The output control method according to claim 8, characterized in that: Also includes, a current value comparison step of comparing the output current detection signal detected in the output current detection step with the target current control signal; The first instruction sending step outputs the first instruction in the form of a voltage control signal according to the comparison result of the current value comparing step.

10. The output control method according to claim 8 or 9, characterized in that: Also includes: a DC voltage detection step of detecting the input voltage when executing the output step and outputting a detected DC voltage detection signal; The output control step adjusts and generates the control signal of the control signal sending step according to the received DC voltage detection signal, the first instruction and the second instruction.

11. A welding device, characterized in that: It comprises an electromagnetic pump for wave soldering, and the output control circuit according to any one of claims 1 to 7, wherein the output end of the output module is connected to the electromagnetic pump.

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