Control circuit and control method compatible with thyristor dimmer

Abstract

A control circuit and control method compatible with a thyristor dimmer, the circuit includes a bus voltage sampling module, a signal conversion module, a TRIAC dimmer conduction judgment module, a pulse generation module, a current discharge control module and a current discharge module. The bus voltage sampling module outputs a bus sampling signal, the signal conversion module outputs a bus square wave signal containing duty cycle information, the TRIAC dimmer conduction judgment module outputs a conduction square wave signal containing TRIAC dimmer conduction time information, the pulse generation module generates a pulse square wave signal, the current discharge control module generates a large current discharge control signal, a small current discharge control signal and a holding current discharge control signal according to the square wave signal, and the current discharge module adjusts the current value of the discharge current signal according to the control signal.

Description

Technical Field

[0001] The invention relates to a control circuit and a control method compatible with a thyristor dimmer. Background Art

[0002] Since the emergence of thyristor dimming in the 1960s, it has dominated the entire lighting dimming field for nearly half a century. It is highly favored by consumers for its high compatibility, low cost, small size, and easy operation. However, the conventional household bidirectional thyristor (TRIAC) dimmer in the prior art is only suitable for adjusting resistive loads such as incandescent lamps and halogen lamps. When it is used to dim ordinary LED drive loads, flickering problems will occur, and wide-range dimming control cannot be achieved.

[0003] See also Figure 1 , Figure 1 The schematic diagram of the structure of the existing thyristor dimming linear constant current LED driving circuit is shown in the figure. As shown in the figure, the circuit is connected to the TRIAC dimmer 10, and mainly includes a rectifier module 11, a discharge module 12, a constant current control module 13 and an output module 14. The discharge module 12 is used to discharge the bus current before the TRIAC dimmer 10 is turned on and when the bus voltage is less than the LED load string conduction voltage. In order to prevent the TRIAC dimmer 10 from having insufficient maintenance current to maintain its conduction after being turned on, thereby causing the LED to flash, the circuit adopts this current discharge module 12, that is, there is a large discharge current before the TRIAC dimmer 10 is turned on, which significantly increases the system power consumption and reduces the efficiency.

[0004] Therefore, how to provide a control circuit and control method compatible with thyristor dimmers that can solve the flicker problem and effectively reduce the duration of the discharge current before the thyristor dimmer is turned on, thereby reducing losses and improving system efficiency, is an issue that needs to be urgently addressed by various industry players. Summary of the invention

[0005] In view of the various deficiencies in the prior art, the main purpose of the present invention is to provide a control circuit and control method compatible with a thyristor dimmer that can solve the flicker problem and effectively reduce the duration of the discharge current before the thyristor dimmer is turned on, thereby reducing losses and improving system efficiency.

[0006] In order to achieve the above-mentioned purpose and other purposes, the present invention provides a control circuit compatible with a thyristor dimmer, which is configured to control the discharge current in an active modulation mode before the thyristor dimmer is turned on to balance the leakage current of the thyristor dimmer. The active modulation mode is different from the control mode of changing in a predetermined manner and keeping the bus voltage constant at a predetermined value. Before the thyristor dimmer is turned on, it is not necessary to control the on and off of the switch based on the comparison signal between the bus voltage signal and the reference threshold voltage. It includes a bus voltage sampling module, a signal conversion module, a TRIAC dimmer conduction judgment module, a pulse generation module, a current discharge control module and a current discharge module.

[0007] The bus voltage sampling module is used to convert a bus voltage signal into a bus sampling signal. The signal conversion module is connected to the bus voltage sampling module to compare the bus sampling signal with a first reference voltage and output a bus square wave signal containing duty cycle information. The TRIAC dimmer conduction judgment module is connected to the bus voltage sampling module to compare the bus sampling signal with a second reference voltage and output a conduction square wave signal containing TRIAC dimmer conduction time information. The pulse generation module is used to generate a pulse square wave signal. The current discharge control module is connected to the pulse generation module, the signal conversion module and the TRIAC dimmer conduction judgment module to generate a large current discharge control signal, a small current discharge control signal and a holding current discharge control signal according to the bus square wave signal, the conduction square wave signal and the pulse square wave signal. The current discharge module is connected to the current discharge control module to adjust the current value of the discharge current signal used to control the bus voltage signal according to the large current discharge control signal, the small current discharge control signal and the holding current discharge control signal.

[0008] In one embodiment, the bus voltage sampling module includes a power tube, a first resistor and a second resistor connected in sequence.

[0009] In one embodiment, the power transistor is a HV NJFET.

[0010] In one embodiment, the signal conversion module includes a first comparator.

[0011] In one embodiment, the TRIAC dimmer conduction determination module includes a second comparator.

[0012] In one embodiment, the pulse generating module includes an oscillator, a frequency divider and a monostable trigger connected in sequence.

[0013] In one embodiment, the current discharge module includes a transistor, a first switch, a second switch and a third switch connected to the transistor, a first current connected to the first switch, a second current connected to the second switch and a third current connected to the third switch.

[0014] In one embodiment, the current discharge control module includes a fourth switch, a first inverter, a second inverter, a third inverter, a first AND gate, a second AND gate, and a conduction time window circuit, wherein the fourth switch is connected to the input end of the first AND gate, the output ends of the first inverter, the second inverter, and the third inverter are connected to the input end of the second AND gate, the input end of the second inverter is connected to the fourth switch, and the input end of the third inverter is connected to the conduction time window circuit.

[0015] In one embodiment, the pulse generating module is further used to set the duty cycle of the pulse square wave signal to control the discharge current signal so as to adapt to thyristor dimmers with different leakage currents.

[0016] The present invention also provides a control method compatible with a thyristor dimmer, the control method comprising: converting a bus voltage signal into a bus sampling signal through a bus voltage sampling module; comparing the bus sampling signal and a first reference voltage through a signal conversion module, and outputting a bus square wave signal containing duty cycle information; comparing the bus sampling signal and a second reference voltage through a TRIAC dimmer conduction judgment module, and outputting a conduction square wave signal containing TRIAC dimmer conduction time information; generating a pulse square wave signal through a pulse generation module; generating a large current discharge control signal, a small current discharge control signal and a holding current discharge control signal according to the bus square wave signal, the conduction square wave signal and the pulse square wave signal through a current discharge control module; and adjusting the current value of the discharge current signal used to control the bus voltage signal according to the large current discharge control signal, the small current discharge control signal and the holding current discharge control signal through the current discharge module.

[0017] The control method belongs to the active modulation mode, that is, the pulse generating circuit actively generates a pulse signal with a duty cycle, and controls different discharge currents iBUS in the high level stage and the low level stage of the pulse signal to balance the leakage current of the thyristor dimmer. The active modulation mode is different from the control mode of changing the predetermined mode and keeping the bus voltage constant at a predetermined value. Before the thyristor dimmer is turned on, it is not necessary to control the on and off of the switch based on the comparison signal of the bus voltage signal and the reference threshold voltage.

[0018] Compared with the prior art, the control circuit and control method compatible with the thyristor dimmer of the present invention belong to the active modulation mode, that is, the pulse generating module actively generates a pulse square wave signal with a duty cycle, thereby controlling different discharge current signals to balance the leakage current of the thyristor dimmer before the thyristor dimmer is turned on, thereby avoiding excessive leakage current of the thyristor dimmer causing a significant delay in the turn-on time of the thyristor dimmer, and solving the problems of increased system power consumption and reduced efficiency in the prior art. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 The figure is a schematic diagram of the circuit structure of an existing thyristor dimming linear constant current LED driving circuit.

[0020] Figure 2 FIG. 1 is a schematic diagram of the circuit structure of a control circuit compatible with a thyristor dimmer according to the first embodiment of the present invention.

[0021] Figure 3 FIG. 1 is a schematic diagram of a circuit structure of a control circuit compatible with a thyristor dimmer according to a second embodiment of the present invention.

[0022] Figure 4 FIG. 4 is a waveform diagram of a control circuit compatible with a thyristor dimmer according to a third embodiment of the present invention.

[0023] Figure 5 FIG. 4 is a waveform diagram of a control circuit compatible with a thyristor dimmer according to a fourth embodiment of the present invention.

[0024] Figure 6 It is a flowchart of the steps of a control circuit compatible with a thyristor dimmer according to a fifth embodiment of the present invention.

[0025] Explanation of symbols

[0026] 10 TRIAC Dimmer

[0027] 11 Rectifier module

[0028] 12 Discharge module

[0029] 13 Constant current control module

[0030] 14 Output Module

[0031] 20 Bus voltage sampling module

[0032] 21 Signal conversion module

[0033] 22 TRIAC dimmer conduction judgment module

[0034] 23 Pulse generation module

[0035] 230 Oscillator

[0036] 231 Crossover

[0037] 232 Monostable trigger

[0038] 24 Current discharge control module

[0039] 240 On-time Window Circuit

[0040] 25 Current discharge module

[0041] AND1 The first AND gate

[0042] AND2 Second AND gate

[0043] CMP1 First comparator

[0044] CMP2 Second comparator

[0045] M1 transistor

[0046] M2 Power Tube

[0047] R1 First resistor

[0048] R2 Second resistor

[0049] S1 First switch

[0050] S2 Second switch

[0051] S3 Third switch

[0052] S4 Fourth switch

[0053] INV1 First inverter

[0054] INV2 Second inverter

[0055] INV3 The third inverter

[0056] i1 First current

[0057] i2 Second current

[0058] i3 Third current DETAILED DESCRIPTION

[0059] The following describes the implementation of the present invention by using specific embodiments. People familiar with the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. The present invention can also be implemented or applied by using other different embodiments.

[0060] See also Figure 2 , Figure 2 The circuit structure diagram of the control circuit compatible with the thyristor dimmer of the first embodiment of the present invention is shown in the figure. As shown in the figure, the present invention provides a control circuit compatible with the thyristor dimmer, including a bus voltage sampling module 20, a signal conversion module 21, a TRIAC dimmer conduction judgment module 22, a pulse generation module 23, a current discharge control module 24 and a current discharge module 25.

[0061] The bus voltage sampling module 20 is used to convert a bus voltage signal V BUS Converted into bus sampling signal V BUS_IN The signal conversion module 21 is connected to the bus voltage sampling module 20 to compare the bus sampling signal VBUS_IN and a first reference voltage V REF1 , and outputs a bus square wave signal V containing duty cycle information BUS_ON The TRIAC dimmer conduction judgment module 22 is connected to the bus voltage sampling module 20 to compare the bus sampling signal V BUS_IN and a second reference voltage V REF2 , and outputs a conduction square wave signal V containing the conduction time information of the TRIAC dimmer BUS_TRIAC_ON The pulse generating module 23 is used to generate a pulse square wave signal VS1. The current discharge control module 24 is connected to the pulse generating module 23, the signal conversion module 21 and the TRIAC dimmer conduction judgment module 22 to determine the current discharge control module 24 according to the bus square wave signal V BUS_ON , turn on the square wave signal V BUS_TRIAC_ON The pulse square wave signal VS1 generates a large current discharge control signal VS1A, a small current discharge control signal VS1B and a holding current discharge control signal VS2. The current discharge module 25 is connected to the current discharge control module 24 to adjust the bus voltage signal V according to the large current discharge control signal VS1A, the small current discharge control signal VS1B and the holding current discharge control signal VS2. BUS The discharge current signal i BUS The current value.

[0062] See also Figure 3 , Figure 3 The circuit structure diagram of the control circuit compatible with the thyristor dimmer of the second embodiment of the present invention is shown in FIG. In one embodiment, the bus voltage sampling module includes a power tube M2, a first resistor R1 and a second resistor R2 connected in sequence. For example, the power tube M2 can be a HV NJFET, but is not limited thereto.

[0063] In one embodiment, the signal conversion module 21 includes a first comparator CMP1 .

[0064] In one embodiment, the TRIAC dimmer conduction determination module 22 includes a second comparator CMP2 .

[0065] In one embodiment, the pulse generating module 23 includes an oscillator 230 , a frequency divider 231 , and a monostable trigger 232 which are connected in sequence.

[0066] In one embodiment, the current discharge module 25 includes a transistor M1 , a first switch S1 , a second switch S2 , and a third switch S3 connected to the transistor M1 , and a first current i1 , a second current i2 , and a third current i3 .

[0067] In one embodiment, the current discharge control module 24 includes a fourth switch S4 , a first inverter INV1 , a second inverter INV2 , a third inverter INV3 , a first AND gate AND1 , a second AND gate AND2 , and an on-time window circuit 240 .

[0068] Bus voltage signal V BUS Through the power tube M2 and the first resistor R1 and the second resistor R2, the bus sampling signal V is adjusted to a lower voltage value. BUS_IN The positive electrode of the first comparator CMP1 is connected to the bus sampling signal V BUS_IN , the negative electrode of the first comparator CMP1 is connected to the reference voltage V REF1 , the first comparator CMP1 outputs a bus square wave signal V BUS_ON , connected to the control end of the fourth switch S4, the bus square wave signal V BUS_ON The first inverter INV1 outputs the signal V BUS_OFF , connected to the input of the second AND gate AND2. Bus square wave signal V BUS_ON Control the on or off of the fourth switch S4. One end of the fourth switch S4 receives the pulse VS1 output by the monostable trigger 232, and the other end of the fourth switch S4 outputs the pulse modulation signal VS1C to the second inverter INV2 and the first AND gate AND1. The positive electrode of the second comparator CMP2 is connected to the bus sampling signal V BUS_IN , the negative electrode of the first comparator CMP1 is connected to the second reference voltage V REF2 , the first comparator CMP1 outputs a bus square wave signal V BUS_TRIAC_ON , to the conduction time window circuit 240. The conduction time window circuit 240 outputs the holding current discharge control signal VS2 to the control end of the third inverter INV3 and the third switch S3. The third inverter INV3 outputs the signal VS2- to the first AND gate AND1 and the second AND gate AND2. The first AND gate AND1 outputs the large current discharge control signal VS1A, and the second AND gate AND2 outputs the small current discharge control signal VS1B.

[0069] The large current discharge control signal VS2 controls the on and off of the third switch S3 , the large current discharge control signal VS1A controls the on and off of the first switch S1 , and the small current discharge control signal VS1B controls the on and off of the second switch S2 .

[0070] The states of the first switch S1, the second switch S2, and the third switch S3 are adjusted to control the bus voltage signal V BUS The discharge current i BUS The current value.

[0071] The first switch S1 is turned on, and the second switch S2 and the third switch S3 are turned off, then the discharge current flowing through the MOS transistor M1 is switched to the current i1, that is, the first current is output;

[0072] The second switch S2 is turned on, and the first switch S1 and the third switch S3 are turned off, then the discharge current flowing through the MOS transistor M1 is switched to the current i2, that is, the second current is output;

[0073] The third switch S3 is turned on, and the first switch S1 and the second switch S2 are turned off, then the discharge current flowing through the MOS transistor M1 is switched to the current i3, that is, the holding current is output.

[0074] See also Figure 4 and Figure 5 , Figure 4 is a waveform diagram of a control circuit compatible with a thyristor dimmer according to a third embodiment of the present invention, and Figure 5 FIG. 4 is a waveform diagram of a control circuit compatible with a thyristor dimmer according to a fourth embodiment of the present invention.

[0075] In the interval from t1 to t2, the signal V BUS_OFF The control circuit compatible with the thyristor dimmer of the present invention works in the active modulation mode, that is, the pulse generating module 23 actively generates a pulse square wave signal VS1 with a duty cycle, and the large current discharge control signal VS1A and the small current discharge control signal VS1B are modulated into mutually inverted pulse signals, and different discharge current signals i are controlled in the high level stage and the low level stage of the pulse signal. BUS To balance the leakage current of the thyristor dimmer. Figure 5 As shown, when the large current discharge control signal VS1A is at a high level, the discharge current signal i flowing through the MOS transistor M1 BUS Switches to current i1; when the small current discharge control signal VS1B is at a low level, the discharge current i flowing through the MOS transistor M1 BUS Switch to current i2.

[0076] In the interval from t2 to t3, the current discharge control signal VS2 is held at a high level, and the discharge current i flowing through the MOS transistor M1 is BUS The current is switched to i3. The time t3 is determined by the on-time window circuit 240.

[0077] The leakage current of the thyristor dimmer is generally between a few mA and tens of mA. The holding current value of the thyristor dimmer is generally in the tens of mA level.

[0078] The current discharge control signal VS2 is output through the inverter INV3 to output the enable control signal VS2-. The output of the first AND gate AND1 is the large current discharge control signal VS1A. One end of the input of the first AND gate AND1 is connected to the signal after the pulse square wave signal VS1 passes through the fourth switch S4, and the other end of the input of the first AND gate AND1 is connected to the enable control signal VS2-. The output of the second AND gate AND2 is the small current discharge control signal VS1B. One end of the input of the second AND gate AND2 is connected to the signal after the pulse square wave signal VS1 passes through the fourth switch S4 and then passes through the second inverter INV2. The other end of the input of the second AND gate AND2 is connected to the bus square wave signal V BUS_ON The other input terminal of the second AND gate AND2 is connected to the enable control signal VS2-.

[0079] The large current discharge control signal VS1A is controlled by the high level pulse width of the pulse square wave signal VS1, and the small current discharge control signal VS1B is controlled by the low level pulse width of the pulse square wave signal VS1.

[0080] The conduction time window circuit 240 enables the TRIAC dimmer to provide a bus voltage signal V within a time window after being turned on. BUS Provide a holding discharge current to ensure that the dimmer can be turned on normally. Within the time window, the holding current discharge control signal VS2 is at a high level, and the third switch S3 is turned on; outside the time window, the holding current discharge control signal VS2 is at a low level, and the third switch S3 is turned off.

[0081] In one embodiment, the pulse generating module 23 is further used to set the duty cycle of the pulse square wave signal VS1 to control the discharge current signal i BUS This allows the device to adapt to thyristor dimmers with different leakage currents.

[0082] Preferably, when the duty cycle of the pulse square wave signal VS1 is large enough, the discharge current signal i flowing through the MOS transistor M1 is BUS The main contribution of comes from the first current. When the first current is set to a certain preset value, the leakage current of the thyristor dimmer will be completely balanced, ensuring the optimal compatibility of the thyristor dimmer.

[0083] The control circuit compatible with the thyristor dimmer of the present invention is configured to control the discharge current signal i in an active modulation mode before the thyristor dimmer is turned on. BUS The leakage current of the thyristor dimmer is balanced so that the leakage current of the thyristor dimmer flowing through the LED load can be controlled, thereby avoiding excessive leakage current of the thyristor dimmer causing a significant delay in the conduction time of the thyristor dimmer, and solving the problems of increased system power consumption and reduced efficiency in the prior art.

[0084] Furthermore, the active modulation mode is that the pulse generating module 23 actively generates a pulse square wave signal VS1 with a duty cycle, and controls different discharge current signals i in the high level stage and the low level stage of the pulse square wave signal VS1. BUS To balance the leakage current of the thyristor dimmer. The active modulation mode is different from the control mode of the prior art that changes in a predetermined manner and keeps the bus voltage constant at a predetermined value. When using the active modulation mode, before the thyristor dimmer is turned on, it is not necessary to control the on and off of the switch based on the comparison signal of the bus voltage signal and the reference threshold voltage.

[0085] See also Figure 6 , Figure 6 The present invention further provides a control method for a compatible thyristor dimmer, which is used to control the discharge current to balance the leakage current of the thyristor dimmer, and the control method comprises the following steps:

[0086] S61. Convert a bus voltage signal into a bus sampling signal through a bus voltage sampling module.

[0087] S62. Compare the bus sampling signal and a first reference voltage through the signal conversion module, and output a bus square wave signal containing duty cycle information.

[0088] S63. Compare the bus sampling signal and a second reference voltage through the TRIAC dimmer conduction determination module, and output a conduction square wave signal containing the TRIAC dimmer conduction time information.

[0089] S64. Generate a pulse square wave signal through a pulse generating module.

[0090] S65. Generate a large current discharge control signal, a small current discharge control signal and a holding current discharge control signal through a current discharge control module according to the bus square wave signal, the conduction square wave signal and the pulse square wave signal.

[0091] S66. The current discharge module adjusts the current value of the discharge current signal used to control the bus voltage signal according to the large current discharge control signal, the small current discharge control signal and the holding current discharge control signal.

[0092] It should be noted that the order of performing steps S62 to S64 can be arbitrarily changed, or steps S62 to S64 can be performed simultaneously.

[0093] In summary, the control circuit and control method compatible with the thyristor dimmer of the present invention belong to the active modulation mode, that is, the pulse generating module actively generates a pulse square wave signal with a duty cycle, thereby controlling different discharge current signals to balance the leakage current of the thyristor dimmer before the thyristor dimmer is turned on, thereby avoiding excessive leakage current of the thyristor dimmer causing a significant delay in the turn-on time of the thyristor dimmer, and solving the problems of increased system power consumption and reduced efficiency in the prior art.

[0094] Through the description of the above preferred specific embodiments, those with ordinary knowledge in the art can more clearly understand the characteristics and spirit of the present invention, but the above embodiments are only for illustrating the principles and effects of the present invention, and are not used to limit the present invention. Therefore, any modification and change made to the above embodiments still does not deviate from the spirit of the present invention, and the scope of rights of the present invention should be as listed in the claims.

Claims

1. A control circuit compatible with a thyristor dimmer, characterized in that: The control circuit comprises: A bus voltage sampling module, used for converting a bus voltage signal into a bus sampling signal; A signal conversion module, connected to the bus voltage sampling module, for comparing the bus sampling signal with a first reference voltage, and outputting a bus square wave signal containing duty cycle information; A TRIAC dimmer conduction judgment module, connected to the bus voltage sampling module, for comparing the bus sampling signal with a second reference voltage, and outputting a conduction square wave signal containing TRIAC dimmer conduction time information; A pulse generating module, used to generate a pulse square wave signal; A current discharge control module is connected to the pulse generation module, the signal conversion module and the TRIAC dimmer conduction judgment module, and is used to generate a large current discharge control signal, a small current discharge control signal and a holding current discharge control signal according to the bus square wave signal, the conduction square wave signal and the pulse square wave signal; and a current discharge module connected to the current discharge control module for adjusting the current value of the discharge current signal for controlling the bus voltage signal according to the large current discharge control signal, the small current discharge control signal and the holding current discharge control signal.

2. The control circuit compatible with thyristor dimmer as claimed in claim 1, characterized in that: The bus voltage sampling module includes a power tube, a first resistor and a second resistor connected in sequence.

3. The control circuit compatible with thyristor dimmer as claimed in claim 2, characterized in that: The power tube is HVNJFET.

4. The control circuit compatible with thyristor dimmer as claimed in claim 1, characterized in that: The signal conversion module includes a first comparator.

5. The control circuit compatible with thyristor dimmer as claimed in claim 1, characterized in that: The TRI AC dimmer conduction determination module includes a second comparator.

6. The control circuit compatible with thyristor dimmer as claimed in claim 1, characterized in that: The pulse generating module comprises an oscillator, a frequency divider and a monostable trigger connected in sequence.

7. The control circuit compatible with thyristor dimmer as claimed in claim 1, characterized in that: The current discharge module includes a transistor, a first switch, a second switch and a third switch connected to the transistor, a first current source connected to the first switch, a second current source connected to the second switch and a third current source connected to the third switch.

8. The control circuit compatible with thyristor dimmer as claimed in claim 1, characterized in that: The current discharge control module includes a fourth switch, a first inverter, a second inverter, a third inverter, a first AND gate, a second AND gate and a conduction time window circuit, wherein the fourth switch is connected to the input end of the first AND gate, the output ends of the first inverter, the second inverter and the third inverter are connected to the input end of the second AND gate, the input end of the second inverter is connected to the fourth switch, and the input end of the third inverter is connected to the conduction time window circuit.

9. The control circuit compatible with thyristor dimmer as claimed in claim 1, characterized in that: The pulse generating module is further used to set the duty cycle of the pulse square wave signal to control the discharge current signal so as to adapt to thyristor dimmers with different leakage currents.

10. A control method compatible with a thyristor dimmer, characterized in that: The control method comprises: converting a bus voltage signal into a bus sampling signal through a bus voltage sampling module; Compare the bus sampling signal with a first reference voltage through a signal conversion module, and output a bus square wave signal containing duty cycle information; The TRIAC dimmer conduction determination module compares the bus sampling signal with a second reference voltage, and outputs a conduction square wave signal containing the TRIAC dimmer conduction time information; Generate a pulse square wave signal through a pulse generating module; A large current discharge control signal, a small current discharge control signal and a holding current discharge control signal are generated by a current discharge control module according to the bus square wave signal, the conduction square wave signal and the pulse square wave signal; and a current value of a discharge current signal used to control the bus voltage signal is adjusted by the current discharge module according to the large current discharge control signal, the small current discharge control signal and the holding current discharge control signal.

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