A power protection circuit and a temperature control circuit of a laser device

Abstract

The utility model provides a kind of power supply protection circuit and temperature control circuit of laser equipment, the power supply protection circuit includes: multiple sub-protection circuits;Sub-protection circuit includes input protection module, first protection module and output protection module;First protection module includes voltage detection unit and electric control device;The input end of input protection module is connected with power supply, and the output end of input protection module is connected with the input end of electric control device, and the first output end of electric control device is connected with the input end of output protection module, and the input end of electric control device is communicated with first output end by normally closed switch element inside;The output end of output protection module is connected with load;Voltage detection unit is used to trigger normally closed switch element to shut down to make input protection module and output protection module disconnect when load voltage is abnormal.The utility model can avoid the failure of one of temperature control module to cause power supply to stop for all temperature control module power supply, improves the power supply flexibility.

Description

Technical Field

[0001] This utility model relates to the field of power supply circuit technology, and in particular to a power supply protection circuit and a temperature control circuit for laser equipment. Background Technology

[0002] In multi-laser operation, high-power lasers generate a significant amount of heat, which can easily lead to overheating and damage to laser components. Therefore, temperature control modules are typically required to regulate the laser temperature. However, existing temperature control modules usually rely on a single power supply. If one module fails, a protection mechanism is triggered, causing the power supply to stop for all modules, thus rendering the laser system unusable. Therefore, the power supply circuitry of existing temperature control modules suffers from limited power supply flexibility. Utility Model Content

[0003] In view of this, the purpose of this utility model is to provide a power supply protection circuit and a temperature control circuit for laser equipment, which can disconnect the faulty temperature control module from the power supply, so as to avoid the power supply stopping to all temperature control modules when one temperature control module fails, thus avoiding affecting the normal use of the laser equipment and improving the power supply flexibility of the temperature control module.

[0004] To achieve the above objectives, the technical solution adopted in this utility model embodiment is as follows:

[0005] In a first aspect, this utility model embodiment provides a power supply protection circuit, including: a plurality of sub-protection circuits, wherein the sub-protection circuits are connected between the power supply and the load;

[0006] The sub-protection circuit includes an input protection module, a first protection module, and an output protection module; the first protection module includes a voltage detection unit and an electrical control device.

[0007] The input terminal of the input protection module is connected to the power supply, the output terminal of the input protection module is connected to the input terminal of the electrical control device, the first output terminal of the electrical control device is connected to the input terminal of the output protection module, and the input terminal and the first output terminal of the electrical control device are internally connected through a normally closed switch element.

[0008] The output terminal of the output protection module is connected to the load, and the input terminal of the voltage detection unit is connected to the output protection module for detecting the voltage of the load.

[0009] The output terminal of the voltage detection unit is connected to the control terminal of the electrical control device;

[0010] The voltage detection unit is used to output a first level signal to the control terminal of the electrical control device when the load voltage is abnormal, triggering the normally closed switch element to turn off so that the input protection module and the output protection module are disconnected.

[0011] Furthermore, this utility model embodiment provides a first possible implementation of the first aspect, wherein the voltage detection unit includes a comparator and a switching device;

[0012] The output terminal of the input protection module is also connected to the control terminal of the electrical control device through the switching device;

[0013] The first input terminal of the comparator is connected to the output protection module, the second input terminal of the comparator is connected to the reference voltage, and the output terminal of the comparator is connected to the control terminal of the switching device.

[0014] The comparator is used to output the first level signal when the load voltage is abnormal, thereby triggering the switching device to turn on.

[0015] The input protection module is used to input a second level signal to the control terminal of the electrical control device through the switching device when the switching device is turned on, so as to trigger the normally closed switch element to turn off and disconnect the input protection module from the output protection module.

[0016] Furthermore, this utility model embodiment provides a second possible implementation of the first aspect, wherein the switching device is a P-type field-effect transistor, the electrical control device is a relay, and the relay includes a coil and a single-pole double-throw switch;

[0017] The output of the comparator is connected to the gate of the P-type field-effect transistor, the source of the P-type field-effect transistor is connected to the coil input of the relay, and the drain is grounded.

[0018] The coil output terminal of the relay is connected to the stationary terminal of the single-pole double-throw switch, the first output terminal of the single-pole double-throw switch is connected to the input terminal of the output protection module, and the stationary terminal and the first output terminal of the single-pole double-throw switch are normally closed.

[0019] Furthermore, this utility model embodiment provides a third possible implementation of the first aspect, wherein the sub-protection circuit further includes: a second protection module;

[0020] The second protection module includes an overcurrent fuse, which is connected between the first output terminal of the electrical control device and the input terminal of the output protection module.

[0021] Furthermore, this utility model embodiment provides a fourth possible implementation of the first aspect, wherein the sub-protection circuit further includes: a comparator power supply module;

[0022] The comparator power supply module includes a delay circuit unit; the delay circuit unit is connected between the input protection module and the power supply terminal of the comparator, and the delay circuit unit is used to first input voltage to the first input terminal of the comparator and then delay the power supply to the comparator.

[0023] Furthermore, this utility model embodiment provides a fifth possible implementation of the first aspect, wherein the comparator power supply module further includes a first overvoltage protection element;

[0024] One end of the first overvoltage protection element is connected to the input protection module and the delay circuit unit, and the other end is grounded.

[0025] Furthermore, this utility model embodiment provides a sixth possible implementation of the first aspect, wherein the delay circuit unit includes a first capacitor, a second capacitor, a first electrolytic capacitor, a second electrolytic capacitor, a first resistor, and a second resistor;

[0026] One end of the first capacitor, the second capacitor, the first electrolytic capacitor, and the second electrolytic capacitor is connected to the output terminal of the input protection module and the power supply terminal of the comparator, and the other end is grounded.

[0027] One end of the first resistor is connected to the output terminal of the input protection module, and the other end is connected to one end of the second resistor. The other end of the second resistor is connected to the power supply terminal of the comparator.

[0028] Furthermore, this utility model embodiment provides a seventh possible implementation of the first aspect, wherein the input protection module includes a second overvoltage protection element and a first indicator light;

[0029] One end of the second overvoltage protection element is connected to the power supply and the electrical control device, and the other end is grounded;

[0030] The positive terminal of the first indicator light is connected to the power supply and the electrical control device, while the negative terminal is grounded.

[0031] Furthermore, this utility model embodiment provides an eighth possible implementation of the first aspect, wherein the output protection module includes a third overvoltage protection element and a second indicator light;

[0032] One end of the third overvoltage protection element is connected to the first output terminal of the electrical control device and the load, and the other end is grounded;

[0033] The positive terminal of the second indicator light is connected to the first output terminal of the electrical control device and the load, while the negative terminal is grounded.

[0034] Secondly, this utility model embodiment also provides a temperature control circuit for a laser device, including: a plurality of temperature control modules and a power supply protection circuit as described in any one of the first aspects; the power supply protection circuit is connected between the power supply and the temperature control modules.

[0035] This utility model provides a power supply protection circuit and a temperature control circuit for a laser device. The power supply protection circuit includes multiple sub-protection circuits connected between the power supply and the load. Each sub-protection circuit includes an input protection module, a first protection module, and an output protection module. The first protection module includes a voltage detection unit and an electrical controller. The input terminal of the input protection module is connected to the power supply, and the output terminal of the input protection module is connected to the input terminal of the electrical controller. The first output terminal of the electrical controller is connected to the input terminal of the output protection module, and the input terminal and the first output terminal of the electrical controller are internally connected through a normally closed switch element. The output terminal of the output protection module is connected to the load, and the input terminal of the voltage detection unit is connected to the output protection module for detecting the load voltage. The output terminal of the voltage detection unit is connected to the control terminal of the electrical controller. When the load voltage is abnormal, the voltage detection unit outputs a first level signal to the control terminal of the electrical controller to trigger the normally closed switch element to turn off, thereby disconnecting the input protection module from the output protection module. This invention sets up multiple sub-protection circuits in the power supply protection circuit, and each sub-protection circuit disconnects the abnormal load from the power supply when the load voltage is abnormal. It can be applied to the power supply of temperature control modules, and can disconnect only the faulty temperature control module from the power supply, so as to avoid the power supply stopping to all temperature control modules when one temperature control module fails, thus avoiding affecting the normal use of laser equipment and improving the flexibility of power supply.

[0036] Other features and advantages of the embodiments of this utility model will be set forth in the following description, or some features and advantages may be inferred from the description or determined without doubt, or may be learned by practicing the above-described techniques of the embodiments of this utility model.

[0037] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, preferred embodiments are described below in detail with reference to the accompanying drawings. Attached Figure Description

[0038] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0039] Figure 1 A schematic diagram of a power supply protection circuit provided by an embodiment of the present invention is shown;

[0040] Figure 2 A circuit diagram of a sub-protection circuit provided by an embodiment of the present invention is shown. Detailed Implementation

[0041] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of this utility model will be described below in conjunction with the accompanying drawings. Obviously, the described embodiments are some embodiments of this utility model, but not all embodiments.

[0042] Currently, in the operation of multiple lasers, high-power lasers generate a large amount of heat. If the temperature is too high, it can easily damage the laser devices. Therefore, temperature control modules are usually set up to regulate the temperature of the lasers. Multiple temperature control modules typically control multiple lasers separately. However, these modules usually share the same power supply. When one temperature control module fails, it will trigger the protection mechanism, causing the power supply to stop supplying power to all temperature control modules, resulting in the laser equipment becoming unusable.

[0043] In addition, the above-mentioned problems also exist in the power supply circuit of the board modules. The board modules share a DC power supply system. When a board is short-circuited, the main power protection is triggered, causing the entire device to lose power and become inoperable.

[0044] To improve the above problems, this utility model provides a power supply protection circuit and a temperature control circuit for laser equipment. The following is a detailed description of this utility model embodiment.

[0045] This embodiment provides a power supply protection circuit, see [link]. Figure 1 The schematic diagram of the power supply protection circuit shown includes: multiple sub-protection circuits 101 to 10N, which are connected between the power supply DC and the load;

[0046] like Figure 1 As shown, each sub-protection circuit includes an input protection module 10, a first protection module 20, and an output protection module 30; the first protection module 20 includes a voltage detection unit 21 and an electrical control device 22;

[0047] The input terminal of the input protection module 10 is connected to the DC power supply, and the output terminal of the input protection module 10 is connected to the input terminal of the electrical control device 22. The first output terminal of the electrical control device 22 is connected to the input terminal of the output protection module 30. The input terminal and the first output terminal of the electrical control device 22 are internally connected through a normally closed switch element. That is, under normal circumstances, the input protection module 10 and the output protection module 30 are connected through the normally closed switch element inside the electrical control device 22.

[0048] The output terminal of the output protection module 30 is connected to the load, and the input terminal of the voltage detection unit 21 is connected to the output protection module 30 to detect the voltage of the load.

[0049] The output terminal of the voltage detection unit 21 is connected to the control terminal of the electrical control device 22;

[0050] The voltage detection unit 21 is used to output a first level signal to the control terminal of the electrical controller 22 when the load voltage is abnormal, triggering the normally closed switch element inside the electrical controller 22 to turn off so that the input protection module 10 and the output protection module 30 are disconnected.

[0051] When a short circuit occurs in the load, the voltage detection unit 21 detects the abnormal load voltage and outputs a first level signal (which can be a high level signal) to the control terminal of the electrical controller 22, so that the normally closed switch element inside the electrical controller 22 changes from the closed state to the open state, thereby disconnecting the input protection module 10 from the output protection module 30.

[0052] The aforementioned load can be a temperature control module or a circuit board module. Each sub-protection circuit can connect to one or more loads. When one of the loads connected to a sub-protection circuit fails, the sub-protection circuit will disconnect the connected load from the power supply. For example, when the number of load temperature control boards is 12, the aforementioned power supply protection circuit can include 3 sub-protection circuits, each connected to 4 temperature control boards. If one temperature control board fails, only the four temperature control boards in that sub-protection circuit are affected, while the other two sub-protection circuits' 8 temperature control boards can still operate normally.

[0053] The voltage detection unit may include a comparator that outputs different voltage signals before and after a load failure; the electrical control device 22 may include an automatic switching element that generates an action based on the level signal output by the voltage detection unit 21, such as a relay with a normally closed switch inside, which may be a single-pole single-throw switch or a single-pole double-throw switch.

[0054] The power supply protection circuit provided in this embodiment, by setting multiple sub-protection circuits in the power supply protection circuit and enabling each sub-protection circuit to disconnect the abnormal load from the power supply when the load voltage is abnormal, can be applied to the power supply of temperature control modules. It can disconnect only the faulty temperature control module from the power supply, avoiding the power supply stopping to all temperature control modules when one temperature control module fails, thus avoiding affecting the normal use of the laser equipment and improving the flexibility of power supply.

[0055] In one embodiment, the voltage detection unit provided in this embodiment includes a comparator and a switching device;

[0056] The output of the input protection module is also connected to the control terminal of the electrical control device via a switching device;

[0057] The first input terminal of the comparator is connected to the output protection module, the second input terminal of the comparator is connected to the reference voltage, and the output terminal of the comparator is connected to the control terminal of the switching device.

[0058] The comparator is used to output a first-level signal when the load voltage is abnormal, triggering the switching device to turn on;

[0059] The input protection module is used to input a second-level signal to the control terminal of the electrical control device through the switching device when the switching device is turned on, so as to trigger the normally closed switching element to turn off and disconnect the input protection module from the output protection module.

[0060] In one embodiment, the first input terminal of the comparator can be the positive input terminal, and the inverting input terminal of the comparator is connected to the reference voltage. When the load is working normally, the positive voltage input to the positive input terminal of the comparator is greater than the reverse voltage input to the inverting input terminal. When the comparator outputs a high-level signal, the switching device is in the off state. When the load malfunctions (such as a short circuit), the positive voltage input to the positive input terminal of the comparator is less than the reverse voltage input to the inverting input terminal, and the comparator outputs a low-level signal to turn on the switching device. When the switching device is on, the input protection module inputs a second-level signal (such as a high-level signal) to the control terminal of the electrical control device through the switching device to trigger the normally closed switching element to turn off and disconnect the input protection module from the output protection module.

[0061] In another embodiment, the first input terminal of the comparator can be the inverting input terminal, and the non-inverting input terminal of the comparator is connected to the reference voltage. When the load is working normally, the positive voltage input to the non-inverting input terminal of the comparator is less than the reverse voltage input to the inverting input terminal. When the comparator outputs a low-level signal, the switching device is in the off state. When the load malfunctions (such as a short circuit), the positive voltage input to the non-inverting input terminal of the comparator is greater than the reverse voltage input to the inverting input terminal, and the comparator outputs a high-level signal to turn on the switching device. When the switching device is on, the input protection module inputs a second-level signal (such as a high-level signal) to the control terminal of the electrical control device through the switching device to trigger the normally closed switching element to turn off and disconnect the input protection module from the output protection module.

[0062] In one embodiment, the switching device provided in this embodiment is a P-type field-effect transistor, and the electrical control device is a relay, which includes a coil and a single-pole double-throw switch; see also... Figure 2 The circuit diagram of the sub-protection circuit shown includes a comparator U1, a P-type field-effect transistor Q1, and a relay K.

[0063] like Figure 2 As shown, the positive input terminal of comparator U1 is connected to the output protection module 30, the inverting input terminal of comparator U1 is connected to the reference voltage, the output terminal of comparator U1 is connected to the gate G of P-type field-effect transistor Q1, the source S of P-type field-effect transistor Q1 is connected to the coil input terminal of relay K, and the drain D is grounded.

[0064] The coil output terminal of relay K is connected to the stationary terminal of single-pole double-throw switch. The first output terminal NC of single-pole double-throw switch is connected to the input terminal of output protection module 30. The stationary terminal of single-pole double-throw switch is normally closed to the first output terminal NC of single-pole double-throw switch.

[0065] When the load is working normally, the forward voltage of comparator U1 is greater than the reverse voltage, comparator U1 outputs a high level, the P-type field-effect transistor Q1 is in the off state, the stationary terminal of the single-pole double-throw switch in relay K and the first output terminal NC of the single-pole double-throw switch are in the closed state, that is, relay K is turned on, the input protection module 10 and the output protection module 30 are connected, and the power supply provides normal power to the load.

[0066] When a load malfunctions (such as a short circuit in the temperature control module), the positive voltage of comparator U1 is pulled low by the output protection module 30. The positive voltage of comparator U1 is less than the reverse voltage, so comparator U1 outputs a negative voltage. The P-type field-effect transistor Q1 is turned on, the coil in relay K is energized, the stationary terminal of the single-pole double-throw switch in relay K is disconnected from the first output terminal NC of the single-pole double-throw switch, and the stationary terminal of the single-pole double-throw switch is closed from the second output terminal NO of the single-pole double-throw switch. The input protection module 10 is disconnected from the output protection module 30, the load circuit is physically disconnected, and the power supply stops supplying power to the load.

[0067] In one embodiment, the sub-protection circuit provided in this embodiment further includes: a second protection module; the second protection module includes an overcurrent fuse, which is connected between the first output terminal of the electrical control device and the input terminal of the output protection module.

[0068] The aforementioned overcurrent fuse can be fuse F1, such as... Figure 2 As shown, fuse F1 is connected between the first output terminal NC of relay K and the input terminal of output protection module 30.

[0069] If the load fault is not resolved, and the input protection module 10 is connected to the output protection module 30 via relay K after power is restored, the fuse F1 will blow as a secondary protection device due to overcurrent. The positive input voltage of comparator U1 will be less than the reverse input voltage, triggering comparator U1 to output a low level, which will turn off the normally closed switch element in relay K, thereby disconnecting the input protection module 10 from the output protection module 30. The fuse F1 will automatically recover after cooling down, and this protection cycle will continue until the load fault is resolved.

[0070] In one implementation, such as Figure 2 As shown, the sub-protection circuit provided in this embodiment further includes: a comparator power supply module 40; the comparator power supply module 40 includes a delay circuit unit 41; the delay circuit unit 41 is connected between the input protection module 10 and the power supply terminal of the comparator U1, and the delay circuit unit is used to first input voltage at the first input terminal of the comparator and then delay power supply to the comparator.

[0071] To avoid comparator errors, the load voltage sampled at the comparator's positive input must be supplied to the comparator before the comparator's power supply. If the comparator's power supply supplies power first, the positive input may not have received the correct load voltage, leading to an incorrect output signal and mis-controlling the load power supply. By incorporating a delay circuit in the comparator's power supply module between the power supply and the comparator, power can be supplied to the comparator after a delay, preventing the comparator from misjudging load fault conditions. The delay time of this delay circuit can be determined based on the load voltage sampling time, and the delay time should be greater than the load voltage sampling time.

[0072] In one embodiment, the comparator power supply module provided in this embodiment further includes a first overvoltage protection element; one end of the first overvoltage protection element is connected to the input protection module and the delay circuit unit, and the other end is grounded.

[0073] The aforementioned first overvoltage protection element can be a transient voltage suppression diode, such as... Figure 2 As shown, one end of the transient voltage suppressor diode TVS1 is connected to the input protection module 10 and the delay circuit unit 41, and the other end is grounded. By setting an overvoltage protection element in the comparator power supply module, when the input voltage is too high, the excess voltage can be released through the first overvoltage protection element, preventing the instantaneous voltage input from the input protection module to the comparator power supply module from being too high, thus playing a role in electrostatic discharge protection.

[0074] In one implementation, such as Figure 2 As shown, the delay circuit unit 41 provided in this embodiment includes a first capacitor C1, a second capacitor C2, a first electrolytic capacitor C3, a second electrolytic capacitor C4, a first resistor R1, and a second resistor R2.

[0075] One end of the first capacitor C1, the second capacitor C2, the first electrolytic capacitor C3, and the second electrolytic capacitor C4 are all connected to the output terminal of the input protection module 10 and the power supply terminal 8 of the comparator U1, and the other end is grounded.

[0076] One end of the first resistor R1 is connected to the output terminal of the input protection module 10, and the other end is connected to one end of the second resistor R2. The other end of the second resistor R2 is connected to the power supply terminal of the comparator U1.

[0077] like Figure 2 As shown, the comparator power supply module 40 may also include a diode D1, resistors R3 and R4, and a P-type field-effect transistor Q2. One end of resistor R3 is connected to the output terminal of the input protection module 10, and the other end is grounded through resistor R4. The gate G of the P-type field-effect transistor Q2 is connected to resistors R3 and R4, the source S is connected to the second capacitor C2, and the drain D is grounded.

[0078] The reference voltage of the comparator mentioned above can be provided by the comparator power supply module, such as... Figure 2 As shown, the other end of the second resistor R2 is also connected to the inverting input terminal 2 of the comparator U1 through resistor R5. The inverting input terminal 2 of the comparator U1 is also grounded through resistor R6. By setting the resistance values ​​of resistors R5 and R6, the reference voltage of the comparator U1 can be set.

[0079] In one embodiment, the input protection module provided in this embodiment includes a second overvoltage protection element and a first indicator light; one end of the second overvoltage protection element is connected to the power supply and the electrical control device, and the other end is grounded; the positive terminal of the first indicator light is connected to the power supply and the electrical control device, and the other end is grounded.

[0080] The aforementioned second overvoltage protection element can be a transient voltage suppressor diode (TVS2), such as... Figure 2 As shown, one end of the second overvoltage protection element TVS2 is connected to the power supply DC via terminal J1, and another end of TVS2 is connected to relay K, while the other end is grounded; one end of the first indicator LED1 is connected to the power supply DC and relay K, while the other end is grounded. By setting an overvoltage protection element in the input protection module, excess voltage can be released through the conduction of the second overvoltage protection element when the input voltage is too high, preventing the instantaneous voltage input to the input protection module by the power supply from being too high.

[0081] like Figure 2 As shown, the input protection module 10 also includes: a diode D3 and a resistor R7. The negative terminal of the diode D3 is connected to the power supply DC through the terminal J1, and the negative terminal of the diode D3 is also connected to the relay K. The positive terminal of the diode D3 is grounded. One end of the resistor R7 is connected to the power supply DC and the relay K, and the other end is connected to the positive terminal of the first indicator LED1.

[0082] In one embodiment, the output protection module provided in this embodiment includes a third overvoltage protection element and a second indicator light; one end of the third overvoltage protection element is connected to the first output terminal of the electronic control device and the load, and the other end is grounded; the positive terminal of the second indicator light is connected to the first output terminal of the electronic control device and the load, and the negative terminal is grounded. By setting an overvoltage protection element in the output protection module, when the input voltage is too high, the excess voltage can be released through the conduction of the third overvoltage protection element, preventing the instantaneous voltage output to the load from being too high.

[0083] The aforementioned third overvoltage protection component can be a transient voltage suppressor diode (TVS3), such as... Figure 2 As shown, one end of the transient voltage suppressor diode TVS3 is connected to the fuse F1 and (through terminal J2) the load, and the other end is grounded; the positive terminal of the second indicator LED2 is connected to the fuse F1 and (through terminal J2) the load, and the negative terminal is grounded.

[0084] like Figure 2 As shown, the output protection module 30 also includes a resistor R8, one end of which is connected to the fuse F1 and (through terminal J2) the load, and the other end is connected to the positive terminal of the second indicator LED2.

[0085] like Figure 2As shown, the first protection module 20 also includes resistors R9 to R12, diode D4, and capacitor C5. One end of resistor R9 is connected to the output terminal of the input protection module 10 and the coil output terminal of relay K, and the other end is connected to the gate G of P-type field-effect transistor Q1 and the output terminal of comparator U1. The coil output terminal of relay K is connected to the stationary terminal of single-pole double-throw switch through resistor R10, and the coil input terminal A2 of relay K is connected to the coil output terminal A1 through diode D4. One end of resistor R11 is connected to the first output terminal NC of relay K and fuse F1, and the other end is connected to the positive input terminal 3 of comparator U1. One end of resistor R12 is connected to the positive input terminal 3 of comparator U1 and resistor R11, and the other end is grounded.

[0086] The power supply protection circuit provided in this embodiment uses multiple sub-protection circuits connected to the load respectively. When a single load fails, the faulty load can be isolated to ensure the power supply to other normal loads and maintain the normal operation of the equipment. By adopting load voltage detection protection (response time ≤10ms), i.e. intelligent overcurrent protection (≤20ms level), and automatically recovering after the fuse cools down, the replacement of fuses can be reduced, thus improving the protection performance of the power supply circuit.

[0087] Corresponding to the power supply protection circuit provided in the above embodiments, this utility model embodiment provides a temperature control circuit for a laser device. The temperature control circuit for the laser device includes: multiple temperature control modules and the power supply protection circuit provided in the above embodiments; the power supply protection circuit is connected between the power supply and the temperature control modules. Each sub-protection circuit in the power supply protection circuit is connected to one or more loads.

[0088] The temperature control circuit for the laser device provided in this embodiment has the same implementation principle and technical effect as the aforementioned embodiment. For the sake of brevity, any parts of the temperature control circuit for the laser device not mentioned in the embodiment can be referred to the corresponding content in the aforementioned power supply protection circuit embodiment.

[0089] Furthermore, in the description of the embodiments of this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. For those skilled in the art, the specific meaning of the above terms in this utility model can be understood according to the specific circumstances.

[0090] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0091] Finally, it should be noted that the above-described embodiments are merely specific implementations of this utility model, used to illustrate the technical solution of this utility model, and not to limit it. The protection scope of this utility model is not limited thereto. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that any person skilled in the art can still modify or easily conceive of changes to the technical solutions described in the foregoing embodiments, or make equivalent substitutions for some of the technical features, within the technical scope disclosed in this utility model. These modifications, changes, or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model, and should all be covered within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the protection scope of the claims.

Claims

1. A power supply protection circuit, characterized in that, include: Multiple sub-protection circuits, each of which is connected between the power supply and each load; The sub-protection circuit includes an input protection module, a first protection module, and an output protection module; the first protection module includes a voltage detection unit and an electrical control device. The input terminal of the input protection module is connected to the power supply, the output terminal of the input protection module is connected to the input terminal of the electrical control device, the first output terminal of the electrical control device is connected to the input terminal of the output protection module, and the input terminal and the first output terminal of the electrical control device are internally connected through a normally closed switch element. The output terminal of the output protection module is connected to the load, and the input terminal of the voltage detection unit is connected to the output protection module for detecting the voltage of the load. The output terminal of the voltage detection unit is connected to the control terminal of the electrical control device; The voltage detection unit is used to output a first level signal to the control terminal of the electrical control device when the load voltage is abnormal, triggering the normally closed switch element to turn off so that the input protection module and the output protection module are disconnected.

2. The power supply protection circuit according to claim 1, characterized in that, The voltage detection unit includes a comparator and a switching device; The output terminal of the input protection module is also connected to the control terminal of the electrical control device through the switching device; The first input terminal of the comparator is connected to the output protection module, the second input terminal of the comparator is connected to the reference voltage, and the output terminal of the comparator is connected to the control terminal of the switching device. The comparator is used to output the first level signal when the load voltage is abnormal, thereby triggering the switching device to turn on. The input protection module is used to input a second level signal to the control terminal of the electrical control device through the switching device when the switching device is turned on, so as to trigger the normally closed switch element to turn off and disconnect the input protection module from the output protection module.

3. The power supply protection circuit according to claim 2, characterized in that, The switching device is a P-type field-effect transistor, and the electrical control device is a relay, which includes a coil and a single-pole double-throw switch. The output of the comparator is connected to the gate of the P-type field-effect transistor, the source of the P-type field-effect transistor is connected to the coil input of the relay, and the drain is grounded. The coil output terminal of the relay is connected to the stationary terminal of the single-pole double-throw switch, the first output terminal of the single-pole double-throw switch is connected to the input terminal of the output protection module, and the stationary terminal and the first output terminal of the single-pole double-throw switch are normally closed.

4. The power supply protection circuit according to claim 1, characterized in that, The sub-protection circuit further includes: a second protection module; The second protection module includes an overcurrent fuse, which is connected between the first output terminal of the electrical control device and the input terminal of the output protection module.

5. The power supply protection circuit according to claim 2, characterized in that, The sub-protection circuit also includes: a comparator power supply module; The comparator power supply module includes a delay circuit unit; the delay circuit unit is connected between the input protection module and the power supply terminal of the comparator, and the delay circuit unit is used to first input voltage to the first input terminal of the comparator and then delay the power supply to the comparator.

6. The power supply protection circuit according to claim 5, characterized in that, The comparator power supply module also includes a first overvoltage protection element; One end of the first overvoltage protection element is connected to the input protection module and the delay circuit unit, and the other end is grounded.

7. The power supply protection circuit according to claim 5, characterized in that, The delay circuit unit includes a first capacitor, a second capacitor, a first electrolytic capacitor, a second electrolytic capacitor, a first resistor, and a second resistor; One end of the first capacitor, the second capacitor, the first electrolytic capacitor, and the second electrolytic capacitor is connected to the output terminal of the input protection module and the power supply terminal of the comparator, and the other end is grounded. One end of the first resistor is connected to the output terminal of the input protection module, and the other end is connected to one end of the second resistor. The other end of the second resistor is connected to the power supply terminal of the comparator.

8. The power supply protection circuit according to claim 1, characterized in that, The input protection module includes a second overvoltage protection element and a first indicator light; One end of the second overvoltage protection element is connected to the power supply and the electrical control device, and the other end is grounded; The positive terminal of the first indicator light is connected to the power supply and the electrical control device, while the negative terminal is grounded.

9. The power supply protection circuit according to claim 1, characterized in that, The output protection module includes a third overvoltage protection element and a second indicator light; One end of the third overvoltage protection element is connected to the first output terminal of the electrical control device and the load, and the other end is grounded; The positive terminal of the second indicator light is connected to the first output terminal of the electrical control device and the load, while the negative terminal is grounded.

10. A temperature control circuit for a laser device, characterized in that, include: Multiple temperature control modules and the power supply protection circuit according to any one of claims 1-9; the power supply protection circuit is connected between the power supply and the temperature control module.

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