Over-temperature and over-current self-protection device and stage lamp with same

Abstract

The utility model relates to the field of stage lamps, in particular to an over-temperature and over-current self-protection device and a stage lamp provided with the over-temperature and over-current self-protection device, which comprise a power supply circuit, a protected circuit, a switch control circuit, an over-temperature protection circuit and / or an over-current protection circuit, the output end of the over-temperature protection circuit and / or the output end of the over-current protection circuit are / is connected to the input end of the switch control circuit through the comparator module, and the switch control circuit controls the power supply circuit to supply power to a protected circuit; the method is used for solving the problem that a stage lamp is burnt out due to the fact that whether an over-temperature or over-current phenomenon occurs in a ballast or a driving module or a stage lamp holder cannot be judged under the condition that an MCU is out of control or the MCU is not connected. According to the stage lamp, over-temperature or over-current detection can be directly carried out on the ballast, the driving module or the light source in the stage lamp under the conditions that the MCU is out of control and is not connected, and the effect of automatically cutting off power supply is achieved, so that the burnout phenomenon caused by out-of-control temperature and current detection of the stage lamp is avoided.

Description

Technical Field

[0001] The utility model relates to the field of stage lights, and more specifically, to an over-temperature and over-current self-protection device and a stage light provided with the same. Background Art

[0002] The light sources of existing stage lights include bubble lights, LED light source modules or laser modules. Among them, the bubble light source is powered by a ballast after inversion, and the LED light source module and the laser module are driven and lit by a driving chip. However, both the ballast and the driving chip are very sensitive to external environmental or electrical interference. Especially when the ballast or the driving chip is damaged, it will cause uncontrolled damage to the bubble light or the LED light source module. Therefore, the prior art uses an MCU to control the ballast or the driving chip to control the light source. When the MCU receives an abnormal current or temperature signal, the light source state is changed through the driving chip or the ballast to avoid damage to the light source.

[0003] However, a new problem has emerged in the above technology. Once the MCU crashes, it will not be able to respond to the received abnormal current or temperature signal, making it difficult to timely change the light source state by controlling the driving chip or the ballast to avoid damage to the light source. Summary of the Utility Model

[0004] The utility model aims to overcome at least one defect (shortcoming) of the above prior art, and provides an over-temperature and over-current self-protection device and a stage light provided with the same, which are used to solve the problem that the stage light is burned out due to the out-of-control of the MCU or the inability to judge whether the ballast or the driving module or the stage light lamp head has an over-temperature or over-current phenomenon without connecting the MCU.

[0005] The technical solution adopted by the utility model is to provide an over-temperature and over-current self-protection device, which includes a power supply circuit, a protected circuit, a switch control circuit, and also includes an over-temperature protection circuit and / or an over-current protection circuit; the over-temperature protection circuit is used to detect the temperature of the protected circuit, the over-current protection circuit is used to detect the current of the protected circuit, the output end of the over-temperature protection circuit and / or the output end of the over-current protection circuit are connected to the input end of the switch control circuit through a comparator module, and the switch control circuit controls the power supply circuit to supply power to the protected circuit; when the over-temperature protection circuit detects and / or the over-current protection circuit detects that the temperature value or current value of the protected circuit is abnormal, the comparator module outputs a low level to the switch control circuit to disconnect the power supply circuit from supplying power to the protected circuit; when the over-temperature protection circuit detects and / or the over-current protection circuit detects that the temperature value and current value of the protected circuit are normal, the comparator module outputs a high level to the switch control circuit to continue the power supply circuit to supply power to the protected circuit.

[0006] It is beneficial to detect whether there is an over-temperature phenomenon in the protected circuit through an over-temperature protection circuit, detect whether there is an over-current phenomenon in the protected circuit through an over-current protection circuit, control the on / off of the power supply circuit through a switch control circuit, and output temperature anomalies and current anomalies as voltage signals through a comparator module, so as to achieve the effect of directly controlling the on / off of the power supply circuit without the signal transmission of an MCU.

[0007] Further, the protected circuit includes a light source and a ballast or drive module for controlling the light source. The input end of the ballast or drive module is connected to the power supply circuit, and the output end is connected to the light source.

[0008] The ballast realizes the functions of current limiting and generating instantaneous high voltage. The drive module converts the electric energy provided by the power supply circuit into fixed-frequency and fixed-voltage or frequency-modulated and voltage-regulated suitable for the normal operation of LEDs or lasers. By connecting the over-current protection circuit between the ballast and / or drive module and the power supply circuit, when an excessive current appears in the ballast, drive module or light source, it can be detected in time to avoid affecting the normal operation of LEDs or lasers after their damage.

[0009] Further, it includes an over-temperature protection circuit and an over-current protection circuit at the same time. When the temperature value and current value of the protected circuit detected by the over-temperature protection circuit and the over-current protection circuit respectively are normal, the comparator module outputs a high level to the switch control circuit to continue the power supply of the power supply circuit to the protected circuit.

[0010] It is beneficial that there is both an over-temperature protection circuit and an over-current protection circuit in the circuit, and the parallel over-current comparator and over-temperature comparator protect the protected circuit at the same time, so that the comparator module can detect the over-temperature and over-current phenomena in the protected circuit at the same time.

[0011] Further, the over-temperature protection circuit includes a thermal module and a reference voltage module. The thermal module is used to sense the temperature of the protected circuit and convert it into a voltage signal and send it to the over-temperature comparator in the comparator module. The reference voltage module provides a reference voltage to the over-temperature comparator in the comparator module.

[0012] It is beneficial to directly, quickly and accurately sense the temperature of the protected circuit through the thermal module, and convert the detected temperature into a voltage signal, so that the comparator module combines the voltage of the reference voltage division module to judge whether the temperature is abnormal.

[0013] Further, the over-current protection circuit includes a current sensor module; the current sensor module includes a detection end and an output end. The detection end is used to detect the current of the protected circuit, and the output end is connected to the input end of the over-current comparator in the comparator module after passing through a filter circuit.

[0014] It is beneficial to detect the current of the protected circuit through the current sensor module, convert the current detection value into a voltage signal and send it to the overcurrent comparator in the comparator module to determine whether the current is abnormal, make the voltage flowing into the input end of the overcurrent comparator stable through the filter circuit, and make the rectified waveform smoother.

[0015] Further, the current sensor module is a current sensor of model MT9221.

[0016] It is beneficial to achieve a wider current detection range and operating temperature range through this type of current sensor, and at the same time maintain high precision and low drift at extreme temperatures, ensure high-quality signal output, and reduce errors.

[0017] Further, the filter circuit includes a magnetic bead, capacitor C117, and capacitor C118. The magnetic bead is connected to the output end. One end of capacitor C117 is grounded and the other end is connected to the input end of the magnetic bead. One end of capacitor C118 is grounded and the other end is connected to the output end of the magnetic bead.

[0018] It is beneficial to connect the filter circuit between the output end of the current sensor module and the input end of the overcurrent comparator, making the rectified waveform flowing into the input end of the overcurrent comparator smoother; filtering high-frequency noise through the magnetic bead; reducing ripples and interference in the signal through the capacitor.

[0019] Further, the switch control circuit includes a switch unit and a relay unit. The switch unit is connected to the output end of the comparator module. The switch unit controls the on and off of the relay unit. The relay unit is connected between the power supply circuit and the protected circuit.

[0020] It is beneficial to connect different branches through the switch unit according to the output level of the comparator module to control the on and off of the relay unit, thereby controlling the on and off of the power supply circuit that supplies power to the protected circuit.

[0021] Further, the switch unit includes a triode and a field effect transistor. The triode is connected to the output end of the comparator module and is used to control the on and off of the field effect transistor. The field effect transistor is used to switch the power supply of the relay unit.

[0022] The triode determines its own on and off according to the output level of the comparator module, thereby affecting the on and off of the field effect transistor, and finally changing the power supply situation of the control relay unit to achieve the on and off of the power supply circuit. A stage light is also provided, which includes a chassis base, a support arm pivotally connected to the chassis base, and a lamp head pivotally connected to the support arm, and also includes the above-mentioned over-temperature and over-current self-protection device, wherein the protected circuit includes a light source located in the lamp head.

[0023] The over-temperature and over-current self-protection device provided in the stage light facilitates detecting the over-current and over-temperature states of the light source, ballast, and drive module in the lamp head, so as to directly, quickly, and accurately detect the over-temperature and over-current phenomena of the stage light in the case of MCU out-of-control or without an MCU, avoid the out-of-control of the stage light, strengthen the use control of the stage light, and extend the service life of the stage light.

[0024] Compared with the prior art, the beneficial effects of the present utility model are as follows: in the case of MCU out-of-control and without connecting an MCU, it can directly detect the over-temperature or over-current of the ballast, drive module, or light source in the stage light, and achieve the effect of automatically cutting off the power supply to avoid the burnout phenomenon caused by the out-of-control of the temperature and current detection of the stage light. Brief Description of the Drawings

[0025] Figure 1 It is a connection schematic diagram of the power supply circuit, protected circuit, and over-current protection circuit of the present utility model.

[0026] Figure 2 It is a connection schematic diagram of the comparator module of the present utility model with the over-current protection circuit and over-temperature protection circuit.

[0027] Figure 3 It is a connection schematic diagram of the relay unit of the present utility model.

[0028] Figure 4 It is a schematic diagram of the stage light of the present utility model.

[0029] Brief Description of the Drawings: Chassis base 100, support arm 200, lamp head 300. Detailed Embodiment

[0030] The drawings of the present utility model are only for illustrative purposes and should not be construed as a limitation to the present utility model. For better illustrating the following embodiments, some components in the drawings will be omitted, enlarged, or reduced, which do not represent the dimensions 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.

[0031] Embodiment 1

[0032] As Figures 1-3As shown in the figure, this embodiment provides an over-temperature and over-current self-protection device, which includes a power supply circuit, a protected circuit, and a switch control circuit, and also includes an over-temperature protection circuit and / or an over-current protection circuit; the over-temperature protection circuit is used to detect the temperature of the protected circuit, and the over-current protection circuit is used to detect the current of the protected circuit. The output end of the over-temperature protection circuit and / or the output end of the over-current protection circuit are connected to the input end of the switch control circuit through a comparator module, and the switch control circuit controls the power supply circuit to supply power to the protected circuit; when the over-temperature protection circuit detects and / or the over-current protection circuit detects that the temperature value or current value of the protected circuit is abnormal, the comparator module outputs a low level to the switch control circuit to disconnect the power supply of the power supply circuit to the protected circuit; when the over-temperature protection circuit detects and / or the over-current protection circuit detects that the temperature value and current value of the protected circuit are normal, the comparator module outputs a high level to the switch control circuit to continue the power supply of the power supply circuit to the protected circuit.

[0033] In this embodiment, the power supply circuit includes a POWER_OUT+ power supply module and a POWER_OUT- power supply module. The POWER_OUT+ power supply module is connected to the input end of the protected circuit, the output end of the protected circuit is connected to the over-current protection circuit, and the switch control circuit controls the on / off of the power supply circuit through whether the over-current protection circuit and / or the over-temperature protection circuit outputs a high voltage.

[0034] The protected circuit includes a light source, a ballast and / or a driving module for controlling the light source. The input end of the ballast or driving module is connected to the power supply circuit, and the output end is connected to the light source.

[0035] In this embodiment, the protected circuit includes a light source, a ballast or a driving module. The light source is a bubble lamp, an LED light source module or a laser module. The bubble lamp is powered after being inverted by the ballast. After the LED light source module and the laser module are inverted by the ballast, they are then driven and illuminated by the driving module. The ballast realizes the functions of current limiting and generating an instantaneous high voltage. The driving module converts the electric energy provided by the power supply circuit into a fixed frequency and fixed voltage or frequency modulation and voltage regulation suitable for the normal operation of the LED.

[0036] Both an over-temperature protection circuit and an over-current protection circuit are included. When the over-temperature protection circuit detects and the over-current protection circuit respectively detects that the temperature value and current value of the protected circuit are normal, the comparator module outputs a high level to the switch control circuit to continue the power supply of the power supply circuit to the protected circuit.

[0037] In this embodiment, the over-temperature comparator is U1, which includes input terminal A and input terminal B. The input terminal A and the input terminal B are used to connect to the power supply terminal and the ground terminal, and the power supply terminal is a power supply voltage of 3.3V. The over-current comparator is U2, which includes input terminal C and input terminal D. The input terminal D is used to connect to the power supply terminal and the ground terminal, and the input terminal C is used to connect to the output terminal VOUT of the current sensor module. The output terminals of the over-temperature comparator U1 and the over-current comparator U2 are both connected to point E, and point E is used to connect to the switch control circuit.

[0038] The over-temperature protection circuit includes a thermal module and a reference voltage module. The thermal module is used to sense the temperature of the circuit to be protected and convert it into a voltage signal and send it to the over-temperature comparator in the comparator module. The reference voltage dividing module provides a reference voltage to the over-temperature comparator in the comparator module.

[0039] In this embodiment, the reference voltage module includes resistor R2 and resistor R4. The input terminal B is connected to the power supply terminal through resistor R2. The power supply terminal is a power supply voltage of 3.3V. The input terminal B is connected to the ground terminal through resistor R4. The input terminal A is connected to the power supply terminal through the thermal module, and the input terminal A is connected to the ground terminal through resistor R3.

[0040] In this embodiment, the thermal module is an NTC, which is used to detect the temperature of the LED module or the bubble lamp. Since the NTC is a negative temperature coefficient component, as the temperature rises, its resistance value will decrease. When the temperature reaches the maximum temperature of the ballast and / or the driver module, the voltage at point B will be greater than that at point A, and point E will be at a high level.

[0041] The over-current protection circuit includes a current sensor module. The current sensor module includes a detection terminal and an output terminal. The detection terminal is used to detect the current of the circuit to be protected, and the output terminal is connected to the input terminal of the over-current comparator in the comparator module after passing through a filtering circuit.

[0042] The current sensor module is a current sensor of model MT9221.

[0043] In this embodiment, the current sensor module is a current sensor of model MT9221, which includes 8 pin ports. Pin 1 and pin 2 are connected to the ballast or the driver module in the circuit to be protected. Pin 3 and pin 4 are connected to the bubble lamp or the LED light source module. Pin 5 is the ground terminal GND. Pin 6 is the filtering terminal FIL. Pin 7 is the output terminal VOUT. Pin 8 is the power supply terminal VCC. The power supply terminal VCC is grounded through capacitor C116. The filtering terminal FIL is grounded through capacitor C119. The output terminal VOUT is grounded after passing through a filtering circuit.

[0044] In this embodiment, the detection end is used to connect to a bubble lamp, an LED light source module, or a laser module.

[0045] The filter circuit includes a magnetic bead, capacitor C117, and capacitor C118. The magnetic bead is connected to the output end. One end of capacitor C117 is grounded and the other end is connected to the input end of the magnetic bead. One end of capacitor C118 is grounded and the other end is connected to the output end of the magnetic bead.

[0046] In this embodiment, the magnetic bead is L11. The magnetic bead L11 is connected to the output end VOUT. One end of capacitor C117 is grounded and the other end is connected to the input end of magnetic bead L11. One end of capacitor C118 is grounded and the other end is connected to the output end of magnetic bead L11. That is, capacitor C117 and capacitor C118 are respectively connected to both ends of magnetic bead L11, and the grounding end is simultaneously connected to capacitor C116, capacitor C117, capacitor C118, and capacitor C119.

[0047] In this embodiment, when the detection end detects that the current reaches the protection value of the ballast, the drive module, or the light source, the input end D of the overcurrent comparator is greater than the input end C, and point E is at a high level.

[0048] The switch control circuit includes a switch unit and a relay unit. The switch unit is connected to the output end of the comparator module. The switch unit controls the on / off of the relay unit. The relay unit is connected between the power supply circuit and the protected circuit.

[0049] In this embodiment, the switch unit includes two connection ends, 5V1 and 5V2. The relay unit includes diode D1 and switch K1. One end of diode D1 is connected to the 5V2 connection end of the switch unit and the other end is grounded. Switch K1 is connected between POWER_IN and POWER_OUT of the power supply circuit. When point E is at a high level, Q2 and Q1 are turned on, 5V2 outputs power supply, and the relay unit controls K1 connected between POWER IN and POWER OUT to disconnect, and the power supply circuit is disconnected.

[0050] The switch unit includes a triode and a field effect transistor. The triode is connected to the output end of the comparator module and is used to control the on / off of the field effect transistor. The field effect transistor is used to switch the power supply of the relay unit.

[0051] In this embodiment, the switch unit includes a triode Q2 and a field effect transistor Q1. The base of the triode Q2 is connected to point E of the comparator module. The emitter of the triode Q2 is grounded. A resistor R6 is connected in parallel across both ends of the emitter of the triode Q2 and point E. The collector of the triode Q2 is connected to the gate of the field effect transistor Q1. The drain of the field effect transistor Q1 is connected to the 5V2 connection terminal. The source of the field effect transistor Q1 is connected to the 5V1 connection terminal. A resistor R1 is connected in parallel across both ends of the gate and the 5V1 connection terminal.

[0052] Embodiment 2

[0053] As Figure 4 shown, a stage light is further provided, which includes a chassis base 100, a support arm 200 pivotally connected to the chassis base 100, and a lamp head 300 pivotally connected to the support arm 200. The over-temperature and over-current self-protection device is further included, and the protected circuit includes a light source located in the lamp head 300.

[0054] In this embodiment, the over-temperature and over-current self-protection device provided in the chassis base 100 can not only be used to detect whether the lamp head 300 is in an over-temperature or over-current state, but also detect whether the ballast and the drive module are in an over-temperature or over-current state.

[0055] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the technical solutions of the present invention, rather than limitations on the specific implementation manners of the present invention. Any modifications, equivalent replacements, and improvements made within the spirit and principle of the claims of the present invention shall be included within the protection scope of the claims of the present invention.

Claims

1. An over-temperature and over-current self-protection device, characterized in that, It includes a power supply circuit, a circuit to be protected, a switch control circuit, and also includes an over-temperature protection circuit and / or an over-current protection circuit; the over-temperature protection circuit is used to detect the temperature of the circuit to be protected, the over-current protection circuit is used to detect the current of the circuit to be protected, the output end of the over-temperature protection circuit and / or the output end of the over-current protection circuit are connected to the input end of the switch control circuit through a comparator module, and the switch control circuit controls the power supply circuit to supply power to the circuit to be protected; When the over-temperature protection circuit detects and / or the over-current protection circuit detects that the temperature value or current value of the circuit to be protected is abnormal, the comparator module outputs a low level to the switch control circuit to cut off the power supply of the power supply circuit to the circuit to be protected; When the over-temperature protection circuit detects and / or the over-current protection circuit detects that the temperature value and current value of the circuit to be protected are normal, the comparator module outputs a high level to the switch control circuit to continue the power supply of the power supply circuit to the circuit to be protected.

2. The over-temperature and over-current self-protection device according to claim 1, wherein The circuit to be protected includes a light source and a ballast or drive module for controlling the light source, and the input end of the ballast or drive module is connected to the power supply circuit, and the output end is connected to the light source.

3. The over-temperature and over-current self-protection device according to claim 1, wherein, It includes both an over-temperature protection circuit and an over-current protection circuit. When the over-temperature protection circuit detects and the over-current protection circuit respectively detects that the temperature value and current value of the circuit to be protected are normal, the comparator module outputs a high level to the switch control circuit to continue the power supply of the power supply circuit to the circuit to be protected.

4. The over-temperature and over-current self-protection device according to claim 1, characterized in that, The over-temperature protection circuit includes a thermal module and a reference voltage module. The thermal module is used to sense the temperature of the circuit to be protected and convert it into a voltage signal and send it to the over-temperature comparator in the comparator module, and the reference voltage module provides a reference voltage to the over-temperature comparator in the comparator module.

5. The over-temperature and over-current self-protection device according to claim 1, characterized in that, The over-current protection circuit includes a current sensor module and a filter circuit; the current sensor module includes a detection end and an output end. The detection end is used to detect the current of the circuit to be protected, and the output end is connected to the input end of the over-current comparator in the comparator module after passing through the filter circuit.

6. The over-temperature and over-current self-protection device according to claim 5, characterized in that The current sensor module is a current sensor of model MT9221.

7. The over-temperature and over-current self-protection device according to claim 5, wherein The filter circuit includes a magnetic bead, a capacitor C117 and a capacitor C118. The magnetic bead is connected to the output end. One end of the capacitor C117 is grounded and the other end is connected to the input end of the magnetic bead. One end of the capacitor C118 is grounded and the other end is connected to the output end of the magnetic bead.

8. The over-temperature and over-current self-protection device according to claim 1, characterized in that, The switch control circuit includes a switch unit and a relay unit. The switch unit is connected to the output end of the comparator module. The switch unit controls the on / off of the relay unit, and the relay unit is connected between the power supply circuit and the circuit to be protected.

9. The over-temperature and over-current self-protection device according to claim 8, characterized in that, The switch unit includes a triode and a field effect transistor. The triode is connected to the output end of the comparator module and is used to control the on / off of the field effect transistor. The field effect transistor is used to switch the power supply of the relay unit.

10. A stage light, characterized in that, It includes a chassis base, a support arm pivotally connected to the chassis base, and a lamp head pivotally connected to the support arm, and also includes the over-temperature and over-current self-protection device according to any one of claims 2-9, wherein the circuit to be protected includes a light source located in the lamp head.

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