Control circuit with slow start switch and stage lamp with same

Abstract

The utility model discloses a control circuit possessing a slow start switch and a stage lamp possessing the same, the control circuit possessing the slow start switch comprises a power supply and a post-stage load, the power supply is a constant voltage power supply, the power supply is electrically connected with the post-stage load through a time delay switch and a current limiting module respectively, and the current limiting module is electrically connected with the post-stage load. The time delay switch is a normally open switch, after the power supply is powered on, the current limiting module is switched on, and when the time delay switch is switched on, the current limiting module is automatically switched off; wherein the limiting current module transmits limiting current I3 to the post-stage load, the anti-impact current of the power supply is I1, the anti-impact current of the time delay switch is I2, and the limiting current I3 is smaller than or equal to the minimum value of I1 and I2. The problem that the impulse current in the control circuit at the moment of power-on causes overload to the post-stage load or switch in the circuit is solved, and the post-stage load or switch can be started gently and safely by using the slow start function.

Description

TECHNICAL FIELD

[0001] The utility model relates to lighting device technical field, more specifically, it relates to control circuit with slow start switch and stage lamp with same. BACKGROUND

[0002] In today's era of rapid development of science and technology, stage lamps have become a complex lighting device that combines multiple light effects. The lamp usually contains multiple modules, mainly including a light source module for generating light and an effect module for intercepting a light beam to generate a specific light spot. To ensure the stability during operation, a bypass capacitor or a decoupling capacitor is usually added to the control circuit to filter noise in the circuit. However, due to the capacitive nature of the capacitor, a large inrush current will be generated at the moment of power-on, which may cause overload protection. Moreover, more and more lamps have added protection auxiliary systems, which will be turned off in time when an abnormality occurs, and then restarted after the fault is eliminated. However, frequent start-up may greatly reduce the service life of the power supply, the subsequent load, and even directly cause damage, seriously affecting the stability of the lamp.

[0003] To solve the problem of inrush current, the market currently mostly uses a method of connecting a resistor in series in the circuit to reduce the current reaching the subsequent load at the moment of power-on. However, due to the large power of the stage lamp load, especially the light source module, the series resistor is prone to generate a large amount of heat during long-term use, and may be burned out, causing the entire circuit to not operate normally. In addition, another method is to reduce the capacity of the bypass capacitor or decoupling capacitor in the subsequent load circuit. However, due to the large number of modules contained in the lamp, it is difficult to significantly reduce the bypass capacitor and decoupling capacitor, so the protection effect is not obvious.

[0004] Therefore, the existing technology has certain limitations in solving the stability and inrush current problems of stage lamp circuits, and the demand for how to efficiently and safely start the lamp has become more urgent, and there is an urgent need for a protection circuit that can enable the stable start of the stage lamp. UTILITY MODEL CONTENTS

[0005] The utility model provides control circuit with slow start switch and stage lamp with same to overcome at least one of the defects of the prior art, solve the problem of inrush current in the control circuit at the moment of power-on causing overload to the subsequent load or switch in the circuit, and enable the subsequent load or switch to start smoothly and safely using the slow start function.

[0006] In order to solve the above technical problems, the utility model adopts the technical scheme of: the control circuit with the slow start switch and the stage lamp with the same, wherein the control circuit with the slow start switch includes the power supply and the rear stage load, the power supply is the constant voltage power supply, and the constant voltage power supply is electrically connected with the rear stage load through the delay switch and the current limiting module respectively, the delay switch is the normally open switch, the current limiting module is first turned on after the power supply is powered on, and the current limiting module is automatically disconnected when the delay switch is turned on, wherein the current limiting module delivers the limited current I3 to the rear stage load, the impact current of the power supply is I1, the impact current of the delay switch is I2, and the limited current I3 is less than or equal to the minimum value of I1 and I2.

[0007] When the control circuit starts to work, the power supply provides constant voltage, the current limiting module is first turned on to provide the limited current I3 for the rear stage load, the size of the limited current I3 is limited in the safety range, the starting surge current is effectively inhibited, the rear stage load can be safely and gently started, at this time, the delay switch is set to be delayed to turn on the current limiting module, and when the delay switch is turned on, the current limiting module is automatically disconnected and no longer participates in power supply, the control circuit is completed to start, and the power supply continuously supplies power for the rear stage load through the delay switch. Compared with the mode that the resistance is directly connected in series in the control circuit to reduce the impact current, since the current limiting module only works at the beginning of starting and is automatically disconnected subsequently, only temporarily plays a role, and does not consume extra power at ordinary times, the overall power consumption of the system can be reduced, the situation that the current limiting module generates heat due to long-term work can be avoided, and the heat management of the circuit is optimized. At the same time, the delay switch and the power supply are effectively protected, and the service life is affected by the impact current to trigger overload protection.

[0008] Further, the delay switch includes the second switch K2 connected with the power supply and the rear stage load and the delay control module for controlling the second switch K2 to be delayed to turn on the current limiting module, the input end of the delay control module is connected with the control voltage, and the output end is connected with the second switch K2. When the second switch K2 is turned on, the power supply can continuously supply power for the rear stage load, and through the setting, the current limiting module and the delay control module can work simultaneously, the second switch K2 is delayed to turn on the current limiting module, the safety starting performance of the control circuit is improved, and the accuracy is high.

[0009] Further, the delay control module comprises a delay capacitor C1, when the control voltage charges the delay capacitor C1 to a preset voltage, the delay control module controls the second switch K2 to be turned on. The delay effect is achieved by using the characteristics of the capacitor, which is simple in structure and easy to maintain.

[0010] Further, the delay control module further comprises a transistor Q4, a field effect transistor Q3, a resistor R6, a resistor R7, a resistor R8, and a resistor R9. The control voltage is connected to the positive electrode of the delay capacitor C1 through the resistor R6. The negative electrode of the delay capacitor C1 is connected to the emitter E of the transistor Q4. The resistor R8 connects the positive electrode of the delay capacitor C1 and the base B of the transistor Q4. The resistor R9 connects the base B and the emitter E of the transistor Q4. The collector C of the transistor Q4 is connected to the gate G of the field effect transistor Q3 through the resistor R7. The control voltage is connected to the source S of the field effect transistor Q3. The drain D of the field effect transistor Q3 is connected to the second switch K2. When the delay control module is started, the control voltage output voltage VDD charges the delay capacitor C1. When the delay capacitor C1 reaches the conduction voltage drop value of the transistor Q4, the transistor Q4 is turned on, and the field effect transistor Q3 is also turned on. The voltage VDD output by the control voltage becomes VDD1 after flowing through the field effect transistor Q3, which further makes the second switch K2 closed and the current limiting module disconnected. Finally, the power supply continuously supplies power to the load. The delay time of the delay circuit mainly depends on the delay capacitor C1, and the time length can also be changed by adjusting the resistance values of the resistor R6 and the resistor R8.

[0011] Further, the second switch K2 is a relay or a field effect transistor. When the load requires a larger current value to work, the relay is more suitable. The field effect transistor has good linearity and high stability.

[0012] Further, it further comprises a switching switch K3 for controlling the on-off of the current limiting module. When the delay switch is turned on, the switching switch K3 cuts off the control voltage of the current limiting module, so that the current limiting module disconnects the electrical connection between the power supply and the load. The use of the switching switch K3 realizes smooth transition from the current limiting mode to the normal working mode, prevents the system from generating transient impact, and only controls the on-off of the current limiting module through the logic of the hardware structure of the circuit, which is simple in structure and high in accuracy.

[0013] Further, the switch K3 is a relay, the common terminal of the switch K3 is connected to the control voltage, the coil terminal is connected to the delay switch, and the normally closed terminal is connected to the current limiting module. When the common terminal of the switch K3 receives the control voltage and the coil terminal is not started, the switch K3 turns on the current limiting module, so that the power supply supplies power to the load, generates a limiting current I3, has high sensitivity, and the relay contact can withstand a higher surge current and will not be easily damaged, and has good reliability.

[0014] Further, the current limiting module includes a first switch K1 and a current limiting resistor arranged in series between the power supply and the load. When the delay switch is turned on, the first switch K1 is automatically disconnected. The current limiting resistor is used for voltage division and current reduction, so that the limiting current I3 output by the current limiting module is within a safe range, and the circuit structure is simple and easy to implement.

[0015] Further, the current limiting resistor is a thermistor. It has high sensitivity and can dynamically change its resistance value according to the use environment. According to the design requirements, a positive temperature coefficient thermistor (PTC) or a negative temperature coefficient thermistor (NTC) can be selected.

[0016] Further, the first switch K1 includes a field effect transistor connected between the power supply and the load, and a first control module for controlling the on-off of the field effect transistor. The first control module is connected to the control voltage in an on-off manner. The field effect transistor has low power consumption, fast switching speed, and no mechanical wear, and can realize silent operation.

[0017] Further, the first control module includes a transistor Q2, a resistor R2, a resistor R3, and a resistor R4. The source S of the field effect transistor is connected to the power supply, the drain D is connected to the load gate G, the gate B of the transistor Q2 is connected to the control voltage in an on-off manner through the resistor R4, the emitter E is grounded, and the resistor R3 is connected between the base B and the emitter E of the transistor Q2. When the base B of the transistor Q2 receives the control voltage, the transistor Q2 is turned on and controls the field effect transistor to be turned on, so that the power supply supplies power to the load. Conversely, when the connection between the transistor Q2 and the control voltage is disconnected, the first switch K1 is disconnected, and the current limiting module stops working.

[0018] Further, the first switch K1 is a relay, a coil end of the relay is connected to a control voltage in an on-off manner, and the on-off switch of the relay is connected to the power supply and the load, respectively. The relay can be directly connected to the control voltage, without the need of an additional control module to control the on-off of the relay, thereby simplifying the circuit structure and improving the stability.

[0019] The utility model also provides a stage lamp, including the lamp head for projecting light beam and the control circuit of any preceding description, install the light source for producing light beam in the lamp head, the load is the drive circuit of light source. The light source power is bigger, so its drive circuit also can produce bigger impact current in the moment of starting, through join the limit current module, effectively reduce the impact current, further guarantee the safe drive of light source.

[0020] Further, the utility model also provides a stage lamp, including the lamp head for projecting light beam and the control circuit of any preceding description, install the light source for producing light beam in the lamp head, the load is the drive circuit of light source. The light source power is bigger, so its drive circuit also can produce bigger impact current in the moment of starting, through join the limit current module, effectively reduce the impact current, further guarantee the safe drive of light source.

[0021] Further, the utility model also provides a stage lamp, including the lamp head for projecting light beam and the control circuit of any preceding description, install the light source for producing light beam in the lamp head, the load is the drive circuit of light source. The light source power is bigger, so its drive circuit also can produce bigger impact current in the moment of starting, through join the limit current module, effectively reduce the impact current, further guarantee the safe drive of light source. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 It is the principle schematic drawing of the control circuit of the slow start switch of the utility model.

[0023] Figure 2 It is the circuit structure schematic drawing of the limit current module when the first switch K1 is the field effect tube in the utility model.

[0024] Figure 3 It is the circuit structure schematic drawing of the delay switch when the second switch K2 is the relay in the utility model.

[0025] Figure 4 It is the circuit structure schematic drawing when the first switch K1 is the field effect tube in the utility model

[0026] Figure 5 is the circuit structure schematic diagram of the first switch K1 being a relay in the application.

[0027] Figure 6 is the stage lamp structure schematic diagram of installing the control circuit with the slow start switch in the application.

[0028] Figure 7 is the stage lamp structure schematic diagram of installing the control circuit with the slow start switch in the application.

[0029] In the figure:

[0030] 100, control circuit; 110, power supply; 120, rear stage load; 130, current limiting module; 131, current limiting resistor; 132, first control module; 140, time delay switch; 141, time delay control module; 150, control voltage (MCU); 160, switching switch K3; 200, lamp holder; 300, support arm; 400, case. DETAILED DESCRIPTION

[0031] The drawings are only used for illustrative description, and cannot be understood as the limitation of the patent; in order to better illustrate the embodiment, some components in the drawings may be omitted, enlarged or reduced, and do not represent the size of the actual product; for those skilled in the art, it is understandable that some well-known structures and their descriptions in the drawings may be omitted. The positional relationship described in the drawings is only used for illustrative description, and cannot be understood as the limitation of the patent.

[0032] As shown in Figures 1 to 5 , the control circuit with the slow start switch and the stage lamp with the same, wherein the control circuit with the slow start switch comprises a power supply 110 and a rear stage load 120, the power supply 110 is a constant voltage power supply, and the power supply 110 and the rear stage load 120 are electrically connected through a time delay switch 140 and a current limiting module 130 respectively, the time delay switch 140 is a normally open switch, the current limiting module 130 is first turned on after the power supply 110 is powered on, and the current limiting module 130 is automatically turned off when the time delay switch 140 is turned on; wherein the current limiting module 130 delivers a limiting current I3 to the rear stage load 120, the anti-impact current of the power supply 110 is I1, the anti-impact current of the time delay switch 140 is I2, and the limiting current I3 is less than or equal to the minimum value of I1 and I2.

[0033] When the control circuit 100 starts to work, the power supply 110 provides constant voltage, and the limiting current module 130 is set to be turned on first to provide the limiting current I3 for the load 120. Since the size of the limiting current I3 is limited in the safe range, the starting surge current is effectively inhibited, and the load 120 can be safely and gently started. At this time, the delay switch 140 is set to be delayed from the turning on of the limiting current module 130. When the delay switch is turned on, the limiting current module 130 is automatically disconnected and no longer participates in power supply. The control circuit 100 completes the starting, and the power supply 110 continuously supplies power to the load 120 through the delay switch 140. Compared with the method of directly connecting a resistor into the control circuit 100 to reduce the impact current, since the limiting current module 130 only works at the beginning and is automatically disconnected subsequently, it only plays a role for a short time and does not consume extra power at ordinary times, which is beneficial to the reduction of the overall power consumption of the system and can avoid the situation that the limiting current module 130 generates heat due to long-term work, thereby optimizing the heat management of the circuit. At the same time, the delay switch and the power supply 110 are effectively protected, and the impact current is avoided to trigger the overload protection and affect the service life.

[0034] Preferably, an MCU for generating a control voltage 150 is further included, and the MCU is electrically connected to the limiting current module 130 and the delay switch 140. The control voltage 150 is used to control the work of the limiting current module 130 and the delay switch 140. That is, when the MCU sends the control voltage 150, the limiting current module 130 and the delay switch 140 can be turned on and work. When the MCU stops sending the control voltage 150 or sends a stop signal, the above two modules cannot start.

[0035] Preferably, the control voltage 150 VDD is 5V.

[0036] Preferably, the limiting current I3 is less than the minimum value of I1 and I2.

[0037] In the preferred embodiment of the utility model, the delay switch 140 includes the second switch K2 connecting the power supply 110 with the later stage load 120 and the delay control module 141 controlling the second switch K2 to delay the conduction of the limiting current module 130, the input end of the delay control module 141 is connected with the control voltage 150, and the output end is connected with the second switch K2. When the second switch K2 is conducted, the power supply 110 can continuously supply power to the later stage load 120, and through the arrangement, the limiting current module 130 and the delay control module 141 can work simultaneously, the purpose of delaying the conduction of the second switch K2 and the limiting current module 130 is achieved, the safety starting performance of the control circuit 100 is improved, and the accuracy is high.

[0038] In the preferred embodiment of the utility model, the delay control module 141 includes a delay capacitor C1, and when the control voltage 150 charges the delay capacitor C1 to a preset voltage, the delay control module 141 controls the second switch K2 to be conducted. The delay effect is achieved by using the characteristics of the capacitor, the structure is simple, and maintenance is easy.

[0039] In the preferred embodiment of the utility model, the delay control module 141 further includes a triode Q4, a field effect tube Q3, a resistor R6, a resistor R7, a resistor R8 and a resistor R9, the control voltage 150 is connected with the positive electrode of the delay capacitor C1 through the resistor R6, the negative electrode of the delay capacitor C1 is connected with the emitter E of the triode Q4, the resistor R8 connects the positive electrode of the delay capacitor C1 with the base B of the triode Q4, the resistor R9 connects the base B with the emitter E of the triode Q4, the collector C of the triode Q4 is connected with the gate G of the field effect tube Q3 through the resistor R7, the control voltage 150 is connected with the source S of the field effect tube Q3, and the drain D of the field effect tube Q3 is connected with the second switch K2. When the delay control module 141 starts, the control voltage 150 outputs the voltage VDD to charge the delay capacitor C1, when the delay capacitor C1 reaches the conduction voltage drop value of the triode Q4, the triode Q4 is conducted, then the field effect tube Q3 is also conducted, the voltage VDD output by the control voltage 150 is changed into VDD1 after flowing through the field effect tube Q3, thereby making the second switch K2 closed and the limiting current module 130 disconnected, finally making the power supply 110 continuously supply power to the later stage load 120, and the delay time of the delay circuit mainly depends on the delay capacitor C1, and the time length can also be changed by adjusting the resistance value of the resistor R6 and the resistor R8.

[0040] Preferably, a switching switch K3160 for controlling the on-off of the limiting current module 130 is further included, the switching switch K3160 is a relay, when the delay switch 140 is turned on, the switching switch K3160 cuts off the control voltage 150 of the limiting current module 130, so that the limiting current module 130 disconnects the connection between the power supply 110 and the subsequent load 120.

[0041] Preferably, the control voltage 150 is VDD, the on-voltage drop of the triode Q4 is Vbe (when the triode Q4 is replaced by a MOS tube, the on-voltage drop is Vgs), the on-current I4 of the triode Q4 is (VDD-Vbe) / (R6+R8); therefore, the charging current of the delay capacitor C1 is I4, and the time required for the delay capacitor C1 to reach the on-voltage drop value Vbe of the triode Q4 is: t1=-R*C1*Ln(1-Vbe / VDD). Wherein, R is the sum of the resistance values of the resistor R6 and the resistor R8, and C1 is the capacitance value of the delay capacitor C1. That is, the delay of the delay switch 140 is greater than or equal to t1 from the time when the limiting current module 130 is turned on.

[0042] Optionally, the appropriate delay time can be set by adjusting the resistance values of the resistor R6 and the resistor R8, or the capacitance value of the delay capacitor C1.

[0043] Optionally, the triode Q4 can be replaced by a MOS tube, and the delay capacitor C1 and the field effect tube Q3 are also matched to delay the turn-on of the second switch K2, and the other circuit structures in the delay control module 141 are adjusted adaptively.

[0044] In the preferred embodiment of the utility model, the second switch K2 is a relay or a field effect tube. When the subsequent load 120 needs a larger current value to work, the relay is more suitable; and the field effect tube has good linearity and high stability.

[0045] Preferably, when the second switch K2 is a relay, a protection diode is connected in parallel with the coil end of the second switch K2.

[0046] In the preferred embodiment of the utility model, still include the change-over switch K3160 for controlling the on-off of the limiting current module 130, when the delay switch 140 is turned on, the change-over switch K3160 disconnects the control voltage 150 of the limiting current module 130, makes the limiting current module 130 disconnect the electrical connection between the power supply 110 and the load 120 of the latter stage. The use of the change-over switch K3160 realizes the smooth transition from the current limiting mode to the normal working mode, prevents the system from generating transient impact, only through the hardware structure logic of the circuit to control the on-off of the limiting current module 130, the structure is simple and accurate.

[0047] In the preferred embodiment of the utility model, the change-over switch K3160 is a relay, the common terminal of the change-over switch K3160 is connected with the control voltage 150, the coil end is connected with the delay switch 140, and the normally closed end is connected with the limiting current module 130. When the common terminal of the change-over switch K3160 receives the control voltage 150, and the coil end is not started, the change-over switch K3160 is turned on the limiting current module 130, so that the power supply 110 supplies power to the load 120 of the latter stage, generates the limiting current I3, has high sensitivity, and the relay contact can withstand higher surge current and will not be easily damaged, has good reliability.

[0048] Preferably, the coil end of the change-over switch K3160 is pin 1, the normally closed end is pin 2, and the common terminal is pin 3.

[0049] Preferably, the delay switch 140 includes a field effect transistor Q3 and a second switch K2, the control voltage 150VDD is converted into VDD1 through the field effect transistor Q3, the converted control voltage 150VDD1 makes the second switch K2 turned on (that is regarded as the delay switch 140 is turned on), at the same time, the field effect transistor Q3 inputs the converted control voltage 150VDD1 to the coil end (pin 1) of the change-over switch K3160, makes the normally closed end disconnect, and finally makes the limiting current module 130 stop working.

[0050] In the preferred embodiment of the utility model, the limiting current module 130 includes a first switch K1 and a current limiting resistor 131 arranged in series between the power supply 110 and the load 120 of the latter stage, and the first switch K1 is automatically disconnected when the delay switch 140 is turned on. The current limiting resistor 131 is used for voltage division, reduces the current value, makes the limiting current I3 output by the limiting current module 130 reach the safe range value, the circuit structure is simple, and easy to realize.

[0051] In the preferred embodiment of the utility model, the current limiting resistor 131 is a thermistor. It has high sensitivity, and dynamically changes its resistance value according to the use environment. It can select a positive temperature coefficient thermistor (PTC) or a negative temperature coefficient thermistor (NTC) according to the design requirement.

[0052] Preferably, the current limiting resistor 131 is a negative temperature coefficient thermistor (NTC), and the resistance value decreases with the increase of temperature. During the working process of the limiting current module 130, it will not generate a large resistance value due to excessive temperature, so as to gradually increase the current, which is beneficial to the smooth start of the control circuit 100.

[0053] In the preferred embodiment of the utility model, the first switch K1 includes a field effect tube connected between the power supply 110 and the subsequent load 120, and a first control module 132 for controlling the on-off of the field effect tube. The first control module 132 is connected to the control voltage 150 in an on-off manner. The field effect tube has low power consumption, fast switching speed, and no mechanical wear, and can realize silent operation.

[0054] Preferably, it further includes a switching switch K3 160 for controlling the on-off of the limiting current module 130. The first control module 132 is electrically connected to the normally closed end of the switching switch K3 160.

[0055] In the preferred embodiment of the utility model, the first control module 132 includes a triode Q2, a resistor R2, a resistor R3, and a resistor R4. The source S of the field effect tube is connected to the power supply 110, the drain D is connected to the subsequent load 120, the gate G is connected to the collector C of the triode Q2 through the resistor R2, the base B of the triode Q2 is connected to the control voltage 150 in an on-off manner through the resistor R4, the emitter E is grounded, and the resistor R3 is connected between the base B and the emitter E of the triode Q2. When the base B of the triode Q2 receives the control voltage 150, the triode Q2 is turned on and controls the field effect tube to be turned on, so as to finally make the power supply 110 supply power to the subsequent load 120. Conversely, when the connection between the triode Q2 and the control voltage 150 is disconnected, that is, the first switch K1 is disconnected, the limiting current module 130 stops working.

[0056] Optionally, the triode Q2 can be replaced by a MOS tube.

[0057] In the preferred embodiment of the utility model, the first switch K1 is a relay, the coil end of the relay is connected to the control voltage 150 in a breakable way, and the on-off switch of the relay is connected to the power supply 110 and the load 120 respectively. The relay can be directly connected to the control voltage 150, without the need of an additional control module to control the on-off of the relay, thus further simplifying the circuit structure and having good stability.

[0058] As shown in Figure 1 , Figure 6 and Figure 7 , the utility model also provides a stage lamp, which comprises a lamp head 200 for projecting a light beam, and further comprises the control circuit 100 described above, the lamp head 200 is internally provided with a light source for generating a light beam, and the load 120 is a driving circuit of the light source. The light source has a large power, so the driving circuit of the light source will generate a large impact current at the moment of starting. By adding the current limiting module 130, the impact current is effectively reduced, and the safe driving of the light source is further ensured.

[0059] In the preferred embodiment of the utility model, the lamp head 200 is pivotally connected to a support arm 300, and the support arm 300 is pivotally connected to a cabinet 400, the lamp head 200 can rotate relative to the cabinet 400 in at least two dimensions, and the load 120 is a driving circuit for driving the rotation of the lamp head 200 and / or the support arm 300. The vertical scanning is realized by rotating the lamp head 200 relative to the support arm 300, and the horizontal scanning is realized by rotating the support arm 300 to drive the lamp head 200 to rotate relative to the cabinet 400. However, since a large power motor is needed to realize the rotation of the lamp head 200 or the support arm 300, the control circuit 100 is needed to avoid the damage of the motor caused by the impact current, and the accuracy of the scanning of the stage lamp is ensured.

[0060] Preferably, the power supply 110 is installed inside the support arm 300 or inside the cabinet 400.

[0061] In the preferred embodiment of the utility model, an effect module for intercepting light to generate a specific light effect is further included, and the load 120 is a driving circuit for driving the effect module. Since the driving circuit of the effect module needs to drive a large number of motors and other electronic components, the control circuit 100 is connected to effectively protect the driving circuit, reduce the damage of the electronic components caused by the impact current at the moment of starting, effectively ensure the service life, and make the operation of the effect module more accurate.

[0062] Preferably, the working time of the current limiting module 130 is very short, almost within 1s or even several milliseconds, and the stage lamp is switched to the normal power supply mode after the completion of the soft start, so that the audience is difficult to perceive the delay of the light effect of the stage lamp; each driving circuit can effectively cope with frequent multiple starts, and the stable operation of the stage lamp is ensured.

[0063] For example, when the working current provided by the power supply 110 for the subsequent load 120 is 100A, the limiting current I3 output by the current limiting module 130 is 5A.

[0064] Obviously, the above embodiments of the utility model are only examples for clearly illustrating the utility model, and are not a limitation on the embodiments of the utility model. For ordinary skilled in the art, on the basis of the above description, other different forms of changes or changes can be made. Here, it is not necessary and impossible to exhaust all the embodiments. Any modification, equivalent replacement and improvement made within the spirit and principle of the utility model should be included in the protection scope of the utility model claim.

Claims

1. A control circuit having a soft start switch, characterized by The application relates to a power supply device, which comprises a power supply (110) and a subsequent load (120), wherein the power supply (110) is a constant-voltage power supply, and the power supply (110) and the subsequent load (120) are electrically connected through a delay switch (140) and a current-limiting module (130) respectively, the delay switch (140) is a normally open switch, the current-limiting module (130) is first turned on after the power supply (110) is powered on, and the current-limiting module (130) is automatically turned off when the delay switch (140) is turned on; wherein the current-limiting module (130) delivers a limited current I3 to the subsequent load (120), the anti-impact current of the power supply (110) is I1, the anti-impact current of the delay switch (140) is I2, and the limited current I3 is less than or equal to the minimum value of I1 and I2.

2. The control circuit of claim 1, wherein, The delay switch (140) comprises a second switch K2 for connecting the power supply (110) and the subsequent load (120) and a delay control module (141) for controlling the second switch K2 to be turned on after the current-limiting module (130) is turned on, and the input end of the delay control module (141) is connected with a control voltage (150), and the output end of the delay control module (141) is connected with the second switch K2.

3. The control circuit of claim 2, wherein, The delay control module (141) comprises a delay capacitor C1, and the delay control module (141) controls the second switch K2 to be turned on after the control voltage (150) charges the delay capacitor C1 to a preset voltage.

4. The control circuit of claim 3, wherein, The delay control module (141) further comprises a transistor Q4, a field effect tube Q3, a resistor R6, a resistor R7, a resistor R8 and a resistor R9, the control voltage (150) is connected with the positive pole of the delay capacitor C1 through the resistor R6, the negative pole of the delay capacitor C1 is connected with the emitter E of the transistor Q4, the resistor R8 is connected with the positive pole of the delay capacitor C1 and the base B of the transistor Q4, the resistor R9 is connected with the base B and the emitter E of the transistor Q4, the collector C of the transistor Q4 is connected with the gate G of the field effect tube Q3 through the resistor R7, the control voltage (150) is connected with the source S of the field effect tube Q3, and the drain D of the field effect tube Q3 is connected with the second switch K2.

5. The control circuit of claim 2, wherein, The second switch K2 is a relay or a field effect tube.

6. The control circuit of claim 1, wherein, The application further comprises a switching switch K3 (160) for controlling the on-off of the current-limiting module (130), and the switching switch K3 (160) cuts off the current-limiting module (130) and the control voltage (150) when the delay switch (140) is turned on, so that the current-limiting module (130) cuts off the electrical connection between the power supply (110) and the subsequent load (120).

7. The control circuit of claim 6, wherein, The switching switch K3 (160) is a relay, the common end of the switching switch K3 (160) is connected with the control voltage (150), the coil end of the switching switch K3 (160) is connected with the delay switch (140), and the normally closed end of the switching switch K3 (160) is connected with the current-limiting module (130).

8. The control circuit of claim 1, wherein, The current-limiting module (130) comprises a first switch K1 and a current-limiting resistor (131) arranged in series between the power supply (110) and the load (120), and the first switch K1 is automatically turned off when the delay switch (140) is turned on.

9. The control circuit of claim 8, wherein, The current-limiting resistor (131) is a thermistor.

10. The control circuit of claim 8, wherein, The first switch K1 comprises a field effect transistor connected between the power supply (110) and the load (120), and a first control module (132) for controlling the on-off of the field effect transistor, and the first control module (132) is connected to the control voltage (150) in an on-off manner.

11. The control circuit of claim 10, wherein, The first control module (132) comprises a transistor Q2, a resistor R2, a resistor R3 and a resistor R4, the source S of the field effect transistor is connected to the power supply (110), the drain D is connected to the load (120), the gate G is connected to the collector C of the transistor Q2 through the resistor R2, the base B of the transistor Q2 is connected to the control voltage (150) in an on-off manner through the resistor R4, the emitter E is grounded, and the resistor R3 is connected between the base B and the emitter E of the transistor Q2.

12. The control circuit of claim 8, wherein, The first switch K1 is a relay, the coil end of the relay is connected to the control voltage (150) in an on-off manner, and the on-off switch of the relay is connected to the power supply (110) and the load (120) respectively.

13. A stage lamp comprising a lamp head (200) for projecting a light beam and the control circuit (100) according to any one of claims 1 to 12, wherein the lamp head (200) is provided with a light source for generating the light beam, and the load (120) is a driving circuit of the light source.

14. The stage light of claim 13, wherein, Further comprising a support arm (300) for pivoting the lamp head (200) and a cabinet (400) for pivoting the support arm (300), and the lamp head (200) can rotate relative to the cabinet (400) in at least two dimensions, and the load (120) is a driving circuit for driving the rotation of the lamp head (200) and / or the support arm (300).

15. The stage light of claim 13, wherein, Further comprising an effect module for intercepting light to generate a specific light effect, and the load (120) is a driving circuit for driving the effect module. Further comprising an effect module for intercepting light to generate a specific light effect, and the load (120) is a driving circuit for driving the effect module.

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