Driving circuit with multiple driving chips connected in parallel and stage lamp

Abstract

The utility model provides a driving circuit with a plurality of driving chips connected in parallel and a stage lamp, comprising a plurality of driving chips, the output ends of which are connected with the same load; each driving chip comprises a control logic circuit and an H bridge, the output end of the control logic circuit is connected with the H bridge, and the two output ends of each H bridge are connected with the load after being connected in parallel; and the control logic circuit is used for controlling the internal current direction of the H bridge and controlling the on-off of the H bridge. According to the utility model, a large-current load is driven by a plurality of small-sized driving chips, so that the current requirement of the load is met.

Description

TECHNICAL FIELD

[0001] The utility model relates to drive circuit technical field especially relates to a plurality of drive chip parallel drive circuit and stage lamp. BACKGROUND

[0002] At present in the stage lamp field, the mainstream scheme of each movement component is all using drive circuit to drive, drives each component to run. Different components need different driving current because of the factors such as movement speed or weight. Stage lamp has the current larger application such as focusing, amplification, vertical scanning, horizontal scanning, also has the current smaller application such as color disc, pattern disc, cutting, diaphragm etc.

[0003] The driving current realized by single motor drive chip driving in prior art is relatively small, cannot satisfy some application requirements of stage lamp. UTILITY MODEL CONTENTS

[0004] The utility model provides a plurality of drive chip parallel drive circuit and stage lamp to solve the defect that the driving current provided by single drive chip in prior art is relatively small, cannot satisfy some application requirements of stage lamp, realizes using a plurality of parallel drive chip to provide larger driving current.

[0005] The utility model provides a plurality of drive chip parallel drive circuit, include:

[0006] A plurality of drive chips, the output of a plurality of drive chips is connected with same load;

[0007] Each drive chip includes control logic circuit and H bridge, the output of control logic circuit is connected H bridge, and the two outputs of each H bridge are connected with load after parallel connection;

[0008] Control logic circuit is used for controlling the internal current direction of H bridge and the on-off of H bridge.

[0009] According to the utility model provides a plurality of drive chip parallel drive circuit, the H bridge in each drive chip has multichannel, and the on-off of H bridge is controlled through the control signal of external input control logic circuit.

[0010] According to the utility model provides a plurality of drive chip parallel drive circuit, further include:

[0011] Current detection circuit, current detection circuit is connected with the input of load, and current detection circuit is used for detecting the input current of load;

[0012] A comparison circuit, an input end of the comparison circuit is connected with an output end of the current detection circuit, and the comparison circuit is used for comparing the input current of the load with a target current and outputting the control signal.

[0013] According to the driving circuit with multiple driving chips connected in parallel provided by the utility model, when the input current of the load is less than the target current, the control signal outputted by the comparison circuit is the first level, and when the input current of the load is greater than the target current, the control signal outputted by the comparison circuit is the second level.

[0014] When the control signal is the first level, the control logic circuit controls at least one H bridge in the driving chip to change from off to on.

[0015] When the control signal is the second level, the control logic circuit controls at least one H bridge in the driving chip to change from on to off.

[0016] According to the driving circuit with multiple driving chips connected in parallel provided by the utility model, the nSLEEP pin triggers the control logic circuit in each driving chip to control the H bridge.

[0017] According to the driving circuit with multiple driving chips connected in parallel provided by the utility model, the load is a two-phase motor or a three-phase motor.

[0018] According to the driving circuit with multiple driving chips connected in parallel provided by the utility model, each driving chip comprises a control logic circuit and two H bridges, an output end of the control logic circuit is connected with the H bridge, and an output end of the H bridge is connected with the load.

[0019] According to the driving circuit with multiple driving chips connected in parallel provided by the utility model, when the load is a two-phase motor and the number of driving chips is 2, the control logic circuit in each driving chip controls two outputs of each H bridge connected with the driving chip in parallel, and the two H bridges of each driving chip are used for driving one phase of the two-phase motor.

[0020] When the load is a three-phase motor and the number of driving chips is 2, the control logic circuit in one of the driving chips controls two outputs of each H bridge connected with the driving chip in parallel, the control logic circuit in the other driving chip controls two outputs of one H bridge connected with the driving chip in parallel, and three parallel ports are used for driving three phases of the three-phase motor.

[0021] The utility model provides a stage lamp, including multiple motion components, the multiple driving circuits with driving chips connected in parallel drive each motion component to move.

[0022] The movement assembly comprises a supporting arm and a lamp head.

[0023] The driving circuit with multiple driving chips connected in parallel and the stage lamp provided by the utility model realize fine control of driving current by utilizing multiple small driving chips to drive large-current load, connecting the two output ends of each H bridge in the driving chip in parallel and then connecting with the load, controlling the internal current direction and on-off of the H bridge by the control logic circuit, thereby meeting the current demand of the load. BRIEF DESCRIPTION OF DRAWINGS

[0024] In order to more clearly illustrate the technical solutions of the utility model or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description, and obviously, the drawings in the following description are some embodiments of the utility model, and for those skilled in the art, other drawings can also be obtained without creative labor.

[0025] Figure 1 It is the driving circuit schematic diagram of the driving circuit with multiple driving chips connected in parallel provided by the utility model;

[0026] Figures 2-3 It is the state schematic diagram of the driving circuit with multiple driving chips connected in parallel provided by the utility model under the fast decay mode;

[0027] Figures 4-5 It is Figure 1 The principle schematic diagram of two driving chips in the utility model;

[0028] Figure 6 It is the driving schematic diagram of the three-phase motor in the driving circuit with multiple driving chips connected in parallel provided by the utility model;

[0029] Figure 7 It is the structure schematic diagram of the stage lamp provided by the utility model;

[0030] Figure 8 It is the structure schematic diagram of the focusing amplification module in the stage lamp provided by the utility model. DETAILED DESCRIPTION

[0031] In order to make the purpose, technical scheme and advantages of the utility model more clear, the following will combine the drawings in the utility model, and clearly and completely describe the technical scheme in the utility model, obviously, the described embodiments are some embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor belong to the protection scope of the utility model.

[0032] The following will combine Figure 1The utility model discloses a kind of driving circuits of multiple drive chips parallel connection, including:

[0033] Multiple drive chips, the output end of multiple drive chips is connected with same load;

[0034] Each drive chip includes control logic circuit and H bridge, the output end of control logic circuit is connected H bridge, and the two output ends of each H bridge are connected with load after parallel connection;

[0035] Control logic circuit is used to control the internal current direction of H bridge, and control the on-off of H bridge.

[0036] Figure 1 The driving circuit in the among includes two drive chips, and can also be more, and the specific quantity of drive chip is not limited in this embodiment.

[0037] Each drive chip is connected with load. Load can be brush type DC motor, two-phase stepper motor, three-phase stepper motor, solenoid or other inductive load.

[0038] As shown in Figure 1 Each drive chip includes two-way H bridge, and the two output ends AOUT1 and AOUT2 of one H bridge are connected in parallel, and the two output ends BOUT1 and BOUT2 of another H bridge are connected in parallel. The output end of H bridge is connected in parallel, and each combination is connected with the winding of load.

[0039] In this embodiment, multiple small drive chips are used to drive large current load, and the two output ends of each H bridge in drive chip are connected in parallel with load, and the internal current direction and on-off of H bridge are controlled by control logic circuit, so as to realize fine control of driving current, and meet the current demand of load.

[0040] On the basis of above embodiment, the H bridge in each drive chip in this embodiment has multiple ways, and the on-off of H bridge is controlled by the control signal inputted to control logic circuit.

[0041] The H bridge in each drive chip has multiple ways, and the on-off of H bridge is controlled according to the control signal inputted to control logic circuit, so as to meet the current demand of load. Each H bridge can provide larger peak current, and can drive the movement of load connected therewith.

[0042] On the basis of above embodiment, this embodiment further includes:

[0043] Current detection circuit, the input end of load is connected with current detection circuit, and current detection circuit is used to detect the input current of load.

[0044] A comparison circuit, an input of which is connected to an output of the current detection circuit, is configured to compare the input current of the load with a target current and output the control signal.

[0045] The current detection circuit detects the input current of the load, the comparison circuit compares the input current of the load with a target current required by an application, and the control logic circuit controls the internal current direction or on-off of the H-bridge according to the control signal output by the comparison circuit, so as to meet the adaptive adjustment of the driving current.

[0046] For example, the former outputs a high level when the latter is small, and outputs a low level when the latter is large.

[0047] When the high level is automatically triggered, the internal current direction of the partial H-bridge flows in the forward direction or is turned on, and when the low level is automatically triggered, the internal current direction of the partial H-bridge flows in the reverse direction or is turned off.

[0048] Alternatively, the former outputs a low level when the latter is small, and outputs a high level when the latter is large. When the low level is automatically triggered, the internal current direction of the partial H-bridge flows in the forward direction or is turned on, and when the high level is automatically triggered, the internal current direction of the partial H-bridge flows in the reverse direction or is turned off.

[0049] For applications with small current, a single driving chip can be used to drive the load movement. The control logic circuit in the single driving chip controls the internal current direction of the H-bridge connected thereto to be in the forward movement or turn on the H-bridge, and the control logic circuit in the other driving chip controls the H-bridge connected thereto to work in the fast decay state, i.e. Figure 2 As shown in FIG. 5, the H-bridge reverses the state to allow the winding current to flow in the reverse direction, as shown in FIG. 6, or turns off the H-bridge. When the winding current approaches zero, the H-bridge stops working to prevent any reverse current from flowing in. Figure 3 Figure 2 For current changes in the fast decay time of 10 us, Figure 3 For current flow paths, ① is the reverse driving current flow path, and ② is the fast decay current flow path.

[0050] For applications with large current, two or more driving chips are used to drive the load movement. The control logic circuit in the two or more driving chips controls the internal current direction of the H-bridge connected thereto to be in the forward movement or turn on the H-bridge, and the control logic circuit in the other driving chip controls the H-bridge connected thereto to work in the fast decay state, i.e.

[0051] ​The embodiment drives the load by connecting multiple drive chips in parallel. When the driving current of the load is insufficient, the driving current is increased by controlling the internal current direction of the H-bridge to flow forward or be turned on. When the driving current of the load is too large, the driving current is reduced by controlling the internal current direction of the H-bridge to flow reversely or be turned off. Thus, the driving current is adaptively adjusted according to the required current of the load, and better application is achieved in cost control, heat dissipation and current protection.

[0052] On the basis of the above embodiment, the control signal output by the comparison circuit when the input current of the load is less than the target current is the first level, and the control signal output by the comparison circuit when the input current of the load is greater than the target current is the second level.

[0053] When the control signal is the first level, the control logic circuit controls at least one H-bridge in the drive chip to change from off to on.

[0054] When the control signal is the second level, the control logic circuit controls at least one H-bridge in the drive chip to change from on to off.

[0055] When the input current of the load is less than the target current, the H-bridges can be controlled to turn on in sequence until the input current of the load is consistent with the target current.

[0056] When the input current of the load is greater than the target current, the H-bridges can be controlled to turn off in sequence until the input current of the load is consistent with the target current.

[0057] On the basis of the above embodiment, the embodiment further includes an nSLEEP pin, which is used as an input end of the control logic circuit in each drive chip and triggers the control logic circuit in each drive chip to turn on or off the H-bridge.

[0058] The embodiment turns off the driving of the H-bridge through the nSLEEP pin, thereby reducing power consumption.

[0059] On the basis of the above embodiments, the load in the embodiment is a two-phase motor or a three-phase motor.

[0060] In the field of stage lights, the mainstream solution for each moving component is to use a two-phase or three-phase motor to drive each component to move. Different components select two-phase or three-phase motor drive according to factors such as moving speed or weight. Therefore, the load in the embodiment is a two-phase motor or a three-phase motor.

[0061] On the basis of the above embodiment, each drive chip in the embodiment includes a control logic circuit and two H-bridges, the output end of the control logic circuit is connected to the H-bridges, and the output end of the H-bridges is connected to the load.

[0062] As Figure 1 shown, Figure 1 Two driving chips are included in the driving circuit, and each driving chip includes two H-bridges to be compatible with two-phase motor and three-phase motor.

[0063] On the basis of the above embodiment, when the load is a two-phase motor and the number of driving chips is 2, the control logic circuit in each driving chip controls two outputs of each H-bridge connected thereto in parallel, and the two H-bridges of each driving chip collectively serve as a phase drive of the two-phase motor.

[0064] When the load is a three-phase motor and the number of driving chips is 2, the control logic circuit in one of the driving chips controls two outputs of each H-bridge connected thereto in parallel, and the control logic circuit in the other driving chip controls two outputs of one of the H-bridges connected thereto in parallel, and the three parallel ports serve as a three-phase drive of the three-phase motor.

[0065] Figures 4-5 The schematic diagram of the two driving chips in the driving circuit. When a single driving chip U1 is used, R8_1, R10_1, R12_1, R4_1, U9 and the peripheral circuit of U9 are not welded, R6_1, R7_1, R9_1, R11_1, R17_1 are welded, R3_1 is welded 0R (MODE is 0), and the resistance value of R1_1 controls the chopping current limiting.

[0066] When two driving chips U1 and U9 are used in parallel, R8_1, R10_1, R12_1, U1, U9 are welded, R6_1, R7_1, R9_1, R11_1, R17_1, R3_1 are not welded, R4_1 is welded 4K7 (MODE is 1), and the resistance value of R1_1 and R1_9 controls the chopping current limiting.

[0067] When the load is a two-phase motor, four PWM (Pulse Width Modulation) are controlled by software, namely PWM2, PWM2_1, PWM1 and PWM1_1 (corresponding to AIN1, AIN2, BIN1 and BIN2 in Figure 1 ), which respectively control the outputs of T1A1, T2A1, T1B1 and T2B1 (corresponding to the outputs AOUT1, AOUT2, BOUT1 and BOUT2 of the two H-bridges in Figure 1 ). The outputs AOUT1 and AOUT2 of one H-bridge corresponding to each driving chip are connected in parallel, and the outputs BOUT1 and BOUT2 of the other H-bridge are connected in parallel, and the parallel outputs of the two H-bridges of each driving chip serve as a phase drive of the two-phase motor.

[0068] As Figure 6As shown, when the load is a three-phase motor, the software in one of the drive chips controls three PWMs, namely PWM2, PWM2_1 and PWM1 (corresponding to AIN1, AIN2 and BIN1 in Figure 1 , respectively) to control the outputs of T1A1, T2A1 and T1B1 (corresponding to the outputs AOUT1, AOUT2 and BOUT1 of the two H-bridges in Figure 1 ). The outputs AOUT1 and AOUT2 of one H-bridge corresponding to one drive chip are connected in parallel, and the outputs BOUT1 and BOUT2 of the other H-bridge are connected in parallel. The outputs of one H-bridge of the other drive chip are connected in parallel, and the three parallel ports are used as the three-phase drive of the three-phase motor.

[0069] This embodiment realizes compatibility of two-phase motors and three-phase motors, and provides a dual-channel integrated motor drive scheme for stage lamps and other motor integrated applications.

[0070] The application also provides a stage lamp comprising a plurality of moving components, wherein each moving component is driven to move by the drive circuit with the current limiting function based on any of the above embodiments.

[0071] The structure of the stage lamp is shown in Figure 7 , which comprises a base 1, support arms 2 and lamp heads 3. The support arms 2 are pivotally connected to the base 1, and the lamp heads 3 are pivotally connected between the support arms 2. The drive circuit is used to drive the lamp heads 3 and / or the support arms 2 to rotate.

[0072] The structure of the focusing and amplifying module in the stage lamp is shown in Figure 8 . The focusing and amplifying module comprises a focusing component 301, a prism component 302, an amplifying component 303, a motor board 304 and a motor 305.

[0073] The focusing component 301, the prism component 302 and the amplifying component 303 realize the functions of focusing, prisms and amplification, respectively. The drive circuit needs to drive the motor 305 to move at different speeds according to different application functions of the focusing and amplifying module.

[0074] On the basis of the above embodiments, the moving component in this embodiment comprises a support arm and a lamp head.

[0075] The support arms 2 and the lamp heads 3 in the stage lamp are driven by the drive circuit with the plurality of drive chips connected in parallel. When the driving current of the load is insufficient, the internal current direction of the H-bridge is controlled to automatically connect a plurality of drive chips in parallel to increase the driving current. When the driving current of the load is too large, the internal current direction of the H-bridge is controlled to automatically reduce the number of drive chips connected in parallel to reduce the driving current, so as to realize self-adaptive adjustment according to the required current of the load.

[0076] It should be finally pointed out that: the above examples are only used to illustrate the technical solutions of the utility model, and not to limit them; although the utility model has been explained in detail with reference to the foregoing examples, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing examples, or make equivalent replacement to part of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the utility model.

Claims

1. A driving circuit with multiple driving chips connected in parallel, characterized in that, The application relates to a driving circuit for driving a load, comprising: a plurality of driving chips, the output ends of the plurality of driving chips being connected with the same load; each driving chip comprising a control logic circuit and an H-bridge, the output end of the control logic circuit being connected with the H-bridge, and the two output ends of each H-bridge being connected in parallel and then connected with the load; the control logic circuit being used for controlling the internal current direction of the H-bridge and controlling the on-off of the H-bridge.

2. The driving circuit according to claim 1, wherein The H-bridge in each driving chip has multiple paths, and the on-off of the H-bridge is controlled by an external input control signal of the control logic circuit.

3. The driving circuit according to claim 2, wherein The application further comprises: a current detection circuit, the current detection circuit being connected with the input end of the load, and the current detection circuit being used for detecting the input current of the load; a comparison circuit, the input end of the comparison circuit being connected with the output end of the current detection circuit, and the comparison circuit being used for comparing the input current of the load with a target current and then outputting the control signal.

4. The driving circuit according to claim 3, wherein The control signal outputted by the comparison circuit when the input current of the load is smaller than the target current is a first level, and the control signal outputted by the comparison circuit when the input current of the load is larger than the target current is a second level; when the control signal is the first level, the control logic circuit controls at least one H-bridge in the driving chip to change from off to on; when the control signal is the second level, the control logic circuit controls at least one H-bridge in the driving chip to change from on to off.

5. The driving circuit according to claim 2, wherein The application further comprises an nSLEEP pin, the nSLEEP pin being used as the input end of the control logic circuit in each driving chip, and the nSLEEP pin triggering the control logic circuit in each driving chip to control the on-off of the H-bridge.

6. The driving circuit of claim 1-5, wherein, The load is a two-phase motor or a three-phase motor.

7. The driving circuit according to claim 6, wherein Each driving chip comprises a control logic circuit and two H-bridges, the output end of the control logic circuit being connected with the H-bridges, and the output ends of the H-bridges being connected with the load.

8. The driving circuit according to claim 7, wherein When the load is a two-phase motor and the number of driving chips is 2, the control logic circuit in each driving chip controls the two output ends of each H-bridge connected with the driving chip to be connected in parallel, and the two H-bridges in each driving chip are used for driving one phase of the two-phase motor. When the load is a three-phase motor and the number of driving chips is 2, the control logic circuit in one of the driving chips controls the two output ends of each H-bridge connected with the driving chip to be connected in parallel, the control logic circuit in the other driving chip controls the two output ends of one H-bridge connected with the driving chip to be connected in parallel, and the three parallel ports are used for driving three phases of the three-phase motor.

9. A stage light, characterized by The application further comprises a plurality of motion assemblies, and the driving circuit comprising the plurality of driving chips according to any one of claims 1 to 8 is used for driving each motion assembly to move.

10. The stage light of claim 9, wherein, The motion assembly comprises a support arm and a lamp head.

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