Laser power driver circuit and laser

Abstract

The present invention discloses a power driver circuit of a laser and a laser. In the power driver circuit, the power branch of the first power unit and the power branch of the second power unit are connected in parallel to a working module outside the circuit, the first current detection unit, the first comparison unit, the first control unit and the first power unit form a first current negative feedback control loop, the second current detection unit, the second comparison unit, the second control unit and the second power unit form a second current negative feedback control loop, to achieve control of the first current flowing through the first power unit and the second current flowing through the second power unit, thereby controlling the total current flowing through the working module, and making the current magnitudes of the first current and the second current as consistent as possible. The power driver circuit can stably, accurately and quickly control the total current flowing through the working module, and has low power consumption and long service life.

Description

Technical Field

[0001] The invention belongs to the technical field of laser control, and in particular relates to a laser power driver circuit and a laser. Background Art

[0002] In industrial control systems, power drivers are roughly divided into two categories: one is a linear driver, and the other is a pulse width modulation switch driver. Compared with the pulse width modulation switch driver, the linear driver has the advantages of smooth driving, small ripple, no electromagnetic switching noise, no need for additional smoothing filter inductors, and high bandwidth. Therefore, the power driver of the laser pump source is usually a linear driver.

[0003] The stability of the laser pump output power directly determines the stability of the final laser output power of the laser. Since the laser pump output power is proportional to the square of the current flowing through the laser pump, the current flowing through the laser pump is required to flow smoothly, with small ripples, and be continuously adjustable. Although linear drivers have advantages such as smooth current flow, small ripples, and high bandwidth, there is a problem of high power consumption of the device itself, which easily leads to high temperatures and requires an additional cooling system for cooling. Generally, the power consumption of power devices consists of two parts: (1) Most of the power consumption is lost in the on-resistance of the device, and this part of the power consumption is proportional to the square of the current; (2) The switching loss generated when the device is switched is caused by the coupling dispersion capacitance of the power device or the switching signal delay.

[0004] In a continuous fiber laser, the laser is mainly in a continuous working state, so the power consumption of the device's on-resistance is the main power consumption of the laser power device. As the laser output power increases, it is necessary to provide the laser with a corresponding current. However, as the current increases, the power consumption of the laser power driver increases, and it is necessary to increase the capacity of the cooling system and the rated power of the semiconductor power driver, which greatly increases the cost of the laser. Summary of the invention

[0005] In view of the above problems, the present invention discloses a power driver circuit of a laser and a laser to overcome the above problems or at least partially solve the above problems.

[0006] In order to achieve the above object, the present invention adopts the following technical solutions:

[0007] On one hand, the present application discloses a power driver circuit of a laser, the power driver circuit comprising a control unit and a power unit; the power driver circuit further comprises a first comparison unit, a second comparison unit, a first current detection unit and a second current detection unit;

[0008] The control unit includes a first control unit and a second control unit, and the power unit includes a first power unit and a second power unit; the power branch of the first power unit and the power branch of the second power unit are respectively connected in series with the first current detection unit and the second current detection unit and then connected in parallel to a working module outside the circuit, and the first control unit and the second control unit are respectively connected to the first power unit and the second power unit;

[0009] The first control unit is used to control a first current flowing through the first power unit, and the second control unit is used to control a second current flowing through the second power unit, thereby controlling a total current flowing through the working module;

[0010] The first comparison unit is connected to the first control unit, and is used to compare the deviation between the current detected by the first current detection unit and the set current, and send the comparison result to the first control unit; the second comparison unit is connected to the second control unit, and is used to compare the deviation between the current detected by the second current detection unit and the set current, and send the comparison result to the second control unit; the first control unit controls the first current flowing through the first power unit according to the comparison result of the first comparison unit, and the second control unit controls the second current flowing through the second power unit according to the comparison result of the second comparison unit, so that the current magnitudes of the first current and the second current are consistent.

[0011] Furthermore, the first power unit includes a resistor R 3 And MOS tube Q 1 The second power unit includes a resistor R 7 And MOS tube Q 2 ;

[0012] The MOS tube Q 1 The drain and the MOS tube Q 2 The drain of the MOS tube Q is connected to the working module. 1 The source of the MOS tube Q 2 The source electrodes are connected to the first current detection unit and the second current detection unit respectively; the first control unit is connected to the first current detection unit through the resistor R 3 Connect the MOS tube Q 1 The gate of the second control unit is connected to the resistor R 7 Connect the MOS tube Q 2 The gate pole.

[0013] Furthermore, the first power unit further includes a resistor R 4 The second power unit also includes a resistor R 8 ;

[0014] The MOS tube Q 1 The gate and the MOS tube Q 2 The gates of the 4 and the resistor R 8 Grounding;

[0015] The resistor R 4 and the resistor R 8 The resistance value of the MOS tube Q is not less than the first preset resistance value, so that the MOS tube Q 1 And the MOS tube Q 2 The transient driving current is not less than the preset current.

[0016] Furthermore, when the resistor R 3 and the resistor R 7 When the resistance values ​​of are all 2Ω, the first preset resistance value is 2KΩ.

[0017] Furthermore, the first control unit includes an operational amplifier U 1 , resistor R 1 , resistor R 2 , resistor R 5 , resistor R 6 , capacitor C 1 and capacitor C 2 The second control unit includes an operational amplifier U 2 , resistor R 9 , resistor R 10 , resistor R 11 , resistor R 12 , capacitor C 3 and capacitor C 4 ;

[0018] The operational amplifier U 1 The non-inverting input terminal is connected to the resistor R 5 , the resistor R 1 , the capacitor C 1 and the resistor R 2 Connect the MOS tube Q 1 The source of the capacitor C 2 In parallel with the resistor R 2 Both ends of the op amp U 1 The inverting input is connected through the resistor R 6 ground, the op amp U 1 The output terminal passes through the resistor R 3 Connected to the MOS tube Q 1 The gate pole;

[0019] The operational amplifier U 2 The non-inverting input terminal is connected to the resistor R11 , the resistor R 9 , the capacitor C 3 and the resistor R 10 Connect the MOS tube Q 2 The source of the capacitor C 4 In parallel with the resistor R 10 Both ends of the op amp U 2 The inverting input is connected through the resistor R 12 ground, the op amp U 2 The output terminal passes through the resistor R 7 Connected to the MOS tube Q 2 The gate pole.

[0020] Furthermore, the first comparison unit includes an operational amplifier U 3 The second comparison unit includes an operational amplifier U 4 ;

[0021] The operational amplifier U 3 The non-inverting input terminal of the op amp U 3 The inverting input terminal is connected to the resistor R 2 and the capacitor C 1 Between the op amp U 3 The output terminal is connected to the resistor R 1 and the resistor R 5 between; the operational amplifier U 4 The non-inverting input terminal of the op amp U 4 The inverting input terminal is connected to the resistor R 10 and the capacitor C 3 Between the op amp U 4 The output terminal is connected to the resistor R 9 and the resistor R 11 between.

[0022] Furthermore, the first current detection unit includes a first current sampling resistor, one end of the first current sampling resistor is connected to the MOS tube Q 1 The other end of the first current sampling resistor is grounded;

[0023] The second current detection unit includes a second current sampling resistor, one end of which is connected to the Q 2 The source is connected, and the other end of the second current sampling resistor is grounded.

[0024] On the other hand, the present application discloses a laser, which is provided with a single laser diode or a plurality of laser diodes connected in series as a working module, and a power driver circuit as described in any of the above items, and the power branch of the first power unit and the power branch of the second power unit are connected in parallel to the laser diode.

[0025] The advantages and beneficial effects of the present invention are:

[0026] In the power driver circuit of the present application, by setting two power units in parallel, the power consumption of the power driver is reduced, and there is no need to increase the capacity of the cooling system; in addition, the power driver circuit controls the first current flowing through the first power unit and the second current flowing through the second power unit respectively through the first control unit and the second control unit, thereby realizing stable, accurate and rapid control of the total current flowing through the working module; and the deviation between the current detected by the first current detection unit and the set current is compared by the first comparison unit, and the comparison result is sent to the first control unit, the second comparison unit compares the deviation between the current detected by the second current detection unit and the set current, and the comparison result is sent to the second control unit, the first control unit and the second control unit respectively regulate the first power unit and the second power unit, so that the current flowing through the first power unit and the second power unit is consistent and close to the set current, thereby ensuring the consistency and stability of the operation of the two power units and extending the service life of the power device. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Various other advantages and benefits will become apparent to those of ordinary skill in the art by reading the detailed description of the preferred embodiments below. The accompanying drawings are only for the purpose of illustrating the preferred embodiments and are not to be considered as limiting the present invention. Moreover, the same reference symbols are used throughout the accompanying drawings to represent the same components. In the accompanying drawings:

[0028] Figure 1 A schematic diagram of the connection structure of a power driver circuit in one embodiment of the present application;

[0029] Figure 2 FIG. 1 is a circuit schematic diagram of a power driver circuit in one embodiment of the present application. DETAILED DESCRIPTION

[0030] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the specific embodiments of the present invention and the corresponding drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0031] The technical solutions provided by various embodiments of the present invention are described in detail below in conjunction with the accompanying drawings.

[0032] In one embodiment of the present application, a power driver circuit of a laser is disclosed, such as Figure 1-2 As shown, the power driver circuit includes a control unit and a power unit. The power driver circuit also includes a first comparison unit V, a second comparison unit VI, a first current detection unit and a second current detection unit.

[0033] Specifically, the control unit includes a first control unit I and a second control unit II, and the power unit includes a first power unit III and a second power unit IV; the power branch of the first power unit III and the power branch of the second power unit IV are respectively connected in series with the first current detection unit and the second current detection unit, and then connected in parallel to a working module outside the circuit, and the working module is connected to a voltage source, and the voltage source provides electrical energy to the working module. The first current detection unit and the second current detection unit are respectively used to detect the first current i flowing through the first power unit. 1 and the second current i flowing through the second power unit 2 .

[0034] The first power unit III is connected in parallel with the second power unit IV. Under the premise of ensuring that the original current is provided to the working module, the current flowing through each power unit is half of the original current. When there is only one power unit in the power driver circuit, its on-resistance is R. When the power driver circuit needs to output a current of I, its power consumption is: P 1 =I 2 R; When there are two parallel power units in the power driver circuit, the power consumption is: P 2 =(1 / 2I) 2 R+(1 / 2I) 2 R=1 / 2I 2 R, it can be seen that P 2 =1 / 2P 1 Therefore, the power consumption of the two power units connected in parallel is half of that of the original single power unit, and the power consumption of each semiconductor power device in the power unit is only 1 / 4 of the original.

[0035] It can be understood that the embodiment of the present application uses only two power units in parallel, but more power units can also be used in parallel according to actual needs. It should be noted that using more power units may bring more complex results and higher device costs, which needs to be balanced according to actual needs.

[0036] The first control unit I and the second control unit II are connected to the first power unit III and the second power unit IV respectively. The first control unit I is used to control the first current i flowing through the first power unit III. 1 The second control unit II is used to control the second current i flowing through the second power unit IV. 2 , thereby controlling the total current i flowing through the working module. Since the total current is the first current i 1 and the second current i 2 The sum of i = i 1 +i 2 , so by controlling the first current i 1 and the second current i 2 The total current i can be controlled.

[0037] The first current detection unit, the first comparison unit V, the first control unit I and the first power unit III form a first current negative feedback control loop, and the second current detection unit, the second comparison unit VI, the second control unit II and the second power unit IV form a second current negative feedback control loop.

[0038] Wherein, the first comparison unit V is connected to the first control unit I, and is used to compare the deviation between the current detected by the first current detection unit and the set current, and send the comparison result to the first control unit I; the second comparison unit VI is connected to the second control unit II, and is used to compare the deviation between the current detected by the second current detection unit and the set current, and send the comparison result to the second control unit II; the first control unit I controls the first current i flowing through the first power unit III according to the comparison result of the first comparison unit V 1 , so that the first current i 1 When the current is close to the set current, the second control unit II controls the second current i flowing through the second power unit IV according to the comparison result of the second comparison unit VI. 2 , so that the second current i 2 Close to the set current, so that the first current i 1 and the second current i 2 The current size is consistent and reaches the set current.

[0039] Normally, the characteristics of the two power units are different, which will lead to different currents flowing through the two power units. In long-term operation, the temperature of the power unit with relatively large current is relatively high and easy to be damaged. Therefore, the first power unit III and the second power unit IV are respectively regulated by the first control unit I and the second control unit II, so that the currents flowing through the first power unit III and the second power unit IV are consistent, thereby ensuring the consistency and stability of the operation of the two power units and extending the service life of the power driver circuit. In addition, the relationship between the magnitude of the set current and the total current i flowing through the working module can be determined according to the number of power units in parallel. For example, if the number of power units in parallel is n, the magnitude of the set current is i / n. The set currents used by the two comparison units can be the same, so that the two power units can be controlled to basically operate in the same state, avoiding partial or complete damage to the power units due to different operating states of the two power units.

[0040] Since the sum of the currents detected by the first current detection unit and the second current detection unit is equal to the total current i flowing through the working module, the first control unit I and the second control unit II control the first power unit III and the second power unit IV to make the first current i 1 and the second current i 2 The size of is close to the set current, thereby making the total current i flowing through the working module as close to twice the set current as possible.

[0041] In summary, in the power driver circuit of the present embodiment, by setting two power units in parallel, the power consumption of the power driver is reduced, and there is no need to increase the capacity of the cooling system; in addition, the power driver circuit controls the first current flowing through the first power unit and the second current flowing through the second power unit respectively through the first control unit and the second control unit, thereby realizing stable, accurate and rapid control of the total current flowing through the working module; and the first comparison unit compares the deviation between the current detected by the first current detection unit and the set current, and sends the comparison result to the first control unit, the second comparison unit compares the deviation between the current detected by the second current detection unit and the set current, and sends the comparison result to the second control unit, the first control unit and the second control unit respectively regulate the first power unit and the second power unit, so that the current flowing through the first power unit and the second power unit remains basically consistent, both are the set current, thereby ensuring the consistency and stability of the operation of the two power units, and extending the service life of the power device.

[0042] In one embodiment, Figure 2 As shown, the first power unit III includes a resistor R 3 And MOS tube Q 1 , the second power unit IV includes a resistor R 7And MOS tube Q 2 .

[0043] Specifically, the MOS tube Q 1 The drain and MOS tube Q 2 The drain of the MOS tube Q is connected to the working module. 1 The source and MOS tube Q 2 The source of the first current detection unit and the second current detection unit are connected respectively; the first control unit I is connected to the first current detection unit and the second current detection unit through the resistor R 3 Connect MOS tube Q 1 The gate of the second control unit II is connected through the resistor R 7 Connect MOS tube Q 2 The gate pole.

[0044] In one embodiment, Figure 2 As shown, the first power unit III also includes a resistor R 4 The second power unit IV also includes a resistor R 8 .

[0045] MOS tube Q 1 The gate and MOS tube Q 2 The gates of 4 and resistor R 8 Ground.

[0046] Among them, the resistor R 4 and resistor R 8 The resistance value of the MOS tube Q is not less than the first preset resistance value, so that 1 And MOS tube Q 2 The transient driving current is not less than the preset current. 4 and resistor R 8 The resistance value is not less than the first preset resistance value, which can effectively increase the current entering the MOS tube Q 1 Gate and MOS tube Q 2 The gate current speeds up the flow through the MOS tube Q 1 The source and drain of the MOS tube Q 2 The source and drain currents respond dynamically, thus accelerating the MOS tube Q 1 And MOS tube Q 2 work dynamics.

[0047] Furthermore, when the resistor R 3 and resistor R 7 When the resistance values ​​of are all 2Ω, the first preset resistance value is 2KΩ, that is, the resistance R 4 and resistor R 8 The resistance value is not less than 2KΩ.

[0048] In one or some embodiments, Figure 2As shown, the first control unit I includes an operational amplifier U 1 , resistor R 1 , resistor R 2 , resistor R 5 , resistor R 6 , capacitor C 1 and capacitor C 2 ; The second control unit II includes an operational amplifier U 2 , resistor R 9 , resistor R 10 , resistor R 11 , resistor R 12 , capacitor C 3 and capacitor C 4 .

[0049] Op amp U 1 The non-inverting input terminal is connected through the resistor R 5 , resistor R 1 , capacitor C 1 and resistor R 2 Connect MOS tube Q 1 The source of the capacitor C 2 Connect in parallel with the resistor R 2 Both ends, op amp U 1 The inverting input is connected through the resistor R 6 Ground, op amp U 1 The output terminal is connected through the resistor R 3 With MOS tube Q 1 Gate connection.

[0050] Op amp U 2 The non-inverting input terminal is connected through the resistor R 11 , resistor R 9 , capacitor C 3 and resistor R 10 Connect MOS tube Q 2 The source of the capacitor C 4 Connect in parallel with the resistor R 10 Both ends, op amp U 2 The inverting input is connected through the resistor R 12 Ground, op amp U 2 The output terminal is connected through the resistor R 7 With MOS tube Q 2 Gate connection.

[0051] The test results show that when the parameters of the components in the power driver circuit of the present embodiment are the same as those in the power driver circuit containing only one power unit, because the first current negative feedback control loop and the second current negative feedback control loop share a working module, they affect each other, so that the first current i flowing through the first power unit and the second power unit 1 and the second current i2 The difference is not big, within the 5% allowable range, but the total current i flowing through the working module and the first current i 1 and the second current i 2 Obvious self-excited oscillations appeared in all of them, and the amplitude of self-excited oscillations was between 5% and 10%.

[0052] Therefore, the resistor R in this embodiment 2 and resistor R 10 The resistance value is not less than 3KΩ, and the capacitor C 1 and capacitor C 3 The value of the capacitor C is not greater than 20pF. 2 and capacitor C 4 When the value is not greater than 100pF, the damping of the first current negative feedback control loop and the second current negative feedback control loop is increased, which can significantly reduce the first current i 1 and the second current i 2 And the total current i flowing through the working module is self-excited oscillation, and at this time the first current i 1 and the second current i 2 Not much difference.

[0053] In one embodiment, Figure 2 As shown, the first comparison unit V includes an operational amplifier U 3 The second comparison unit VI includes an operational amplifier U 4 .

[0054] Specifically, the op amp U 3 The non-inverting input terminal of the op amp is connected to the setting current, 3 The inverting input terminal is connected to the resistor R 2 and capacitor C 1 Between, receiving the voltage corresponding to the feedback current from the first current detection unit, the operational amplifier U 3 The output terminal is connected to the resistor R 1 and resistor R 5 Between, op amp U 3 The output terminal is connected through the resistor R 1 and capacitor C 1 Connect to op amp U 3 The inverting input terminal makes the resistor R 1 , capacitor C 1 And op amp U 3 It forms a local voltage negative feedback loop, which plays a role in local stability. 4 The non-inverting input terminal of the op amp is connected to the setting current, 4 The inverting input terminal is connected to the resistor R 10 and capacitor C 3 Between, receiving the voltage corresponding to the feedback current from the second current detection unit, the operational amplifier U4 The output terminal is connected to the resistor R 9 and resistor R 11 Between, op amp U 4 The output terminal is connected through the resistor R 9 and capacitor C 3 Connect to op amp U 4 The inverting input terminal makes the resistor R 9 , capacitor C 3 And op amp U 4 It forms a local voltage negative feedback loop, which plays a role in local stability.

[0055] In one or some embodiments, the first current detection unit includes a first current sampling resistor, such as Figure 2 As shown, one end of the first current sampling resistor is connected to the MOS tube Q 1 The other end of the first current sampling resistor is grounded.

[0056] The second current detection unit includes a second current sampling resistor, such as Figure 2 As shown, one end of the second current sampling resistor is connected to the MOS tube Q 2 The other end of the second current sampling resistor is grounded.

[0057] Of course, the first current detection unit and the second current detection unit may be other current detection devices, which are also within the protection scope of the present application.

[0058] In one embodiment of the present application, a laser is disclosed, in which a single laser diode or a plurality of laser diodes connected in series as a working module is provided, and a power driver circuit as in any of the above embodiments, a power branch of a first power unit and a power branch of a second power unit are connected in parallel to the laser diode, and the laser has the advantages of low power consumption and strong controllability.

[0059] The above is only a specific embodiment of the present invention. Under the above teachings of the present invention, those skilled in the art can make other improvements or modifications on the basis of the above embodiments. Those skilled in the art should understand that the above specific description is only to better explain the purpose of the present invention, and the protection scope of the present invention shall be based on the protection scope of the claims.

Claims

1. A power driver circuit for a laser, the power driver circuit comprising a control unit and a power unit; characterized in that: The power driver circuit further includes a first comparison unit, a second comparison unit, a first current detection unit, and a second current detection unit; The control unit includes a first control unit and a second control unit, and the power unit includes a first power unit and a second power unit; the power branch of the first power unit and the power branch of the second power unit are respectively connected in series with the first current detection unit and the second current detection unit and then connected in parallel to a working module outside the circuit, and the first control unit and the second control unit are respectively connected to the first power unit and the second power unit; The first control unit is used to control a first current flowing through the first power unit, and the second control unit is used to control a second current flowing through the second power unit, thereby controlling a total current flowing through the working module; The first comparison unit is connected to the first control unit, and is used to compare the deviation between the current detected by the first current detection unit and the set current, and send the comparison result to the first control unit; the second comparison unit is connected to the second control unit, and is used to compare the deviation between the current detected by the second current detection unit and the set current, and send the comparison result to the second control unit; The first control unit controls a first current flowing through the first power unit according to a comparison result of the first comparison unit, and the second control unit controls a second current flowing through the second power unit according to a comparison result of the second comparison unit, so that the first current and the second current have the same current magnitude; The first power unit includes a resistor R3 and a MOS tube Q1, and the second power unit includes a resistor R7 and a MOS tube Q2; The drain of the MOS tube Q1 and the drain of the MOS tube Q2 are connected to the working module, and the source of the MOS tube Q1 and the source of the MOS tube Q2 are connected to the first current detection unit and the second current detection unit respectively; the first control unit is connected to the gate of the MOS tube Q1 through the resistor R3, and the second control unit is connected to the gate of the MOS tube Q2 through the resistor R7; The first control unit includes an operational amplifier U1, a resistor R1, a resistor R2, a resistor R5, a resistor R6, a capacitor C1 and a capacitor C2; the second control unit includes an operational amplifier U2, a resistor R9, a resistor R 10 , resistor R 11 , resistor R 12 , capacitor C3 and capacitor C4; The non-inverting input terminal of the operational amplifier U1 is connected to the source of the MOS tube Q1 through the resistor R5, the resistor R1, the capacitor C1 and the resistor R2 in sequence, the capacitor C2 is connected in parallel across the resistor R2, the inverting input terminal of the operational amplifier U1 is grounded through the resistor R6, and the output terminal of the operational amplifier U1 is connected to the gate of the MOS tube Q1 through the resistor R3; The in-phase input terminal of the operational amplifier U2 is connected to the resistor R 11 , the resistor R9, the capacitor C3 and the resistor R 10 The capacitor C4 is connected to the source of the MOS tube Q2 in parallel with the resistor R 10 The inverting input terminal of the operational amplifier U2 is connected to the resistor R 12 The output end of the operational amplifier U2 is connected to the gate of the MOS tube Q2 through the resistor R7.

2. The power driver circuit according to claim 1, characterized in that: The first power unit further includes a resistor R4; the second power unit further includes a resistor R8; The gate of the MOS tube Q1 and the gate of the MOS tube Q2 are grounded through the resistor R4 and the resistor R8 respectively; The resistance values ​​of the resistor R4 and the resistor R8 are not less than a first preset resistance value, so that the transient driving current of the MOS transistor Q1 and the MOS transistor Q2 is not less than a preset current.

3. The power driver circuit according to claim 2, characterized in that: When the resistance values ​​of the resistor R3 and the resistor R7 are both 2Ω, the first preset resistance value is 2KΩ.

4. The power driver circuit according to claim 1, characterized in that: The first comparison unit includes an operational amplifier U3, and the second comparison unit includes an operational amplifier U4; The non-inverting input terminal of the operational amplifier U3 is connected to the set current, the inverting input terminal of the operational amplifier U3 is connected between the resistor R2 and the capacitor C1, and the output terminal of the operational amplifier U3 is connected between the resistor R1 and the resistor R5; the non-inverting input terminal of the operational amplifier U4 is connected to the set current, and the inverting input terminal of the operational amplifier U4 is connected to the resistor R 10 and the capacitor C3, the output end of the operational amplifier U4 is connected to the resistor R9 and the resistor R 11 between.

5. The power driver circuit according to any one of claims 1 to 4, characterized in that: The first current detection unit includes a first current sampling resistor, one end of the first current sampling resistor is connected to the source of the MOS tube Q1, and the other end of the first current sampling resistor is grounded; The second current detection unit includes a second current sampling resistor, one end of the second current sampling resistor is connected to the source of Q2 of the MOS tube, and the other end of the second current sampling resistor is grounded.

6. A laser, characterized in that: The laser is provided with a single laser diode or a plurality of laser diodes connected in series as a working module, and a power driver circuit as described in any one of claims 1 to 5, and the power branch of the first power unit and the power branch of the second power unit are connected in parallel to the laser diode.

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