CN118487485A - Discharge circuit and energy storage system of auxiliary source circuit - Google Patents
Discharge circuit and energy storage system of auxiliary source circuit Download PDFInfo
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- CN118487485A CN118487485A CN202410912300.0A CN202410912300A CN118487485A CN 118487485 A CN118487485 A CN 118487485A CN 202410912300 A CN202410912300 A CN 202410912300A CN 118487485 A CN118487485 A CN 118487485A
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- 238000004146 energy storage Methods 0.000 title claims abstract description 15
- 238000004804 winding Methods 0.000 claims description 50
- 230000004913 activation Effects 0.000 claims description 16
- 230000007935 neutral effect Effects 0.000 claims description 2
- 239000003990 capacitor Substances 0.000 description 21
- 238000010586 diagram Methods 0.000 description 10
- 238000007599 discharging Methods 0.000 description 7
- 238000005070 sampling Methods 0.000 description 6
- 230000001276 controlling effect Effects 0.000 description 5
- 230000001105 regulatory effect Effects 0.000 description 4
- 230000003213 activating effect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 230000002459 sustained effect Effects 0.000 description 1
Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/32—Means for protecting converters other than automatic disconnection
- H02M1/322—Means for rapidly discharging a capacitor of the converter for protecting electrical components or for preventing electrical shock
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
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- Engineering & Computer Science (AREA)
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- Dc-Dc Converters (AREA)
Abstract
本申请涉及一种辅源电路的泄放电路及储能系统。包括：泄放控制模块，用于在辅源电路的输入源处于接入状态或者所述辅源电路的母线电压小于第一预设电压时，输出第一电平信号；在所述辅源电路的输入源处于拔除状态，且所述辅源电路的母线电压大于或等于第一预设电压值时，输出第二电平信号；泄放模块，用于在所述第一电平信号的控制下停止工作，在所述第二电平信号的控制下工作，释放所述母线电压。采用本申请的辅源电路的泄放电路可以避免辅源被激活或闪屏现象。
The present application relates to a discharge circuit and energy storage system of an auxiliary source circuit. It includes: a discharge control module, which is used to output a first level signal when the input source of the auxiliary source circuit is in a connected state or the bus voltage of the auxiliary source circuit is less than a first preset voltage; when the input source of the auxiliary source circuit is in a disconnected state and the bus voltage of the auxiliary source circuit is greater than or equal to a first preset voltage value, output a second level signal; a discharge module, which is used to stop working under the control of the first level signal, and work under the control of the second level signal to release the bus voltage. The discharge circuit of the auxiliary source circuit of the present application can avoid the auxiliary source from being activated or the screen flashing phenomenon.
Description
Technical Field
The application relates to the technical field of energy storage power supplies, in particular to a bleeder circuit of an auxiliary source circuit and an energy storage system.
Background
When the energy storage system is activated by alternating Current (ALTERNATING CURRENT AC), the auxiliary source circuit is rectified from Alternating Current (AC) to Direct Current (DC), then the auxiliary source is activated by the transformer, and when the AC is activated, the AC source is pulled out again, and the auxiliary source is activated or a screen flashing phenomenon can be caused due to the fact that the bus voltage of the auxiliary source circuit after the AC rectification is very high after the AC source is pulled out.
Disclosure of Invention
Accordingly, it is desirable to provide a bleeder circuit and an energy storage system for an auxiliary source circuit that can prevent the auxiliary source from being activated or from flashing after the AC source is removed after the AC source is activated.
In a first aspect, the present application provides a bleeder circuit for an auxiliary source circuit, comprising:
The discharging control module is used for outputting a first level signal when an input source of the auxiliary source circuit is in an access state or bus voltage of the auxiliary source circuit is smaller than a first preset voltage; outputting a second level signal when an input source of the auxiliary source circuit is in a unplugged state and the bus voltage of the auxiliary source circuit is greater than or equal to a first preset voltage value;
And the discharging module is used for stopping working under the control of the first level signal and releasing the bus voltage under the control of the second level signal.
In one embodiment, the bleeder module is connected with a bus voltage end of the auxiliary source circuit and a secondary winding of a transformer in the auxiliary source circuit, and a control end of the bleeder module is connected with the bleeder control module;
The secondary winding of the transformer is coupled with the primary winding of the transformer, the primary winding of the transformer is connected with the bus voltage end, and the discharging module is used for discharging the bus voltage through the voltage of the primary winding coupled to the secondary winding under the control of the second level signal.
In one embodiment, the bleed module includes: the first diode, the first switch tube and the first resistor;
The anode of the first diode is connected with the bus voltage end of the auxiliary source circuit and the secondary winding, the cathode of the first diode is connected with the first end of the first switch tube, the control end of the first switch tube is connected with the discharge control module, the second end of the first switch tube is connected with one end of the first resistor, and the other end of the first resistor is grounded.
In one embodiment, the circuit further comprises: the activation control module is used for controlling the discharge module to be connected with the secondary winding of the transformer when the input source of the auxiliary source circuit is in an access state and when the input source of the auxiliary source circuit is in a unplugged state and the bus voltage is greater than or equal to a first preset voltage value; and when the bus voltage is smaller than a first preset voltage value, the bleeder module is controlled to be disconnected with the secondary winding of the transformer.
In one embodiment, the activation control module is connected to the bleeder module and the secondary winding of the transformer, and a control end of the activation control module is connected to a bus voltage end of the auxiliary source circuit.
In one embodiment, the bleed control module includes:
The first control module is used for outputting the first level signal when the input source of the auxiliary source circuit is in an access state, and outputting the second level signal after the input source of the auxiliary source circuit is switched from the access state to a unplugged state;
the second control module is used for outputting the second level signal when the bus voltage is greater than or equal to a first preset voltage value after the input source of the auxiliary source circuit is switched from the access state to the unplugged state, and outputting the first level signal when the bus voltage is less than the first preset voltage value;
The first level signal is a high level signal, and the second level signal is a low level signal.
In one embodiment, the input source of the first control module is the input source of the auxiliary source circuit, and the output end of the first control module is connected with the bleeder module;
the input end of the second control module is a bus voltage end of the auxiliary source circuit, and the output end of the second control module is connected with the output end of the first control module and the discharge module.
In one embodiment, the first control module includes:
the first input end of the first comparator is connected with the live wire of the input source of the auxiliary source circuit, the second input end of the first comparator is connected with the zero line of the input source of the auxiliary source circuit, and the output end of the first comparator is connected with the output end of the second control module and the discharge module.
In one embodiment, the second control module includes:
The first input end of the second comparator is connected with the bus voltage end of the auxiliary source circuit, the second input end of the second comparator is grounded, and the output end of the second comparator is connected with the second input end of the third comparator;
The first input end of the third comparator is connected with the target voltage end, and the output end of the third comparator is connected with the output end of the first comparator and the bleeder module;
The voltage value of the target voltage end is a second preset voltage value.
In a second aspect, the present application further provides an energy storage system, including an auxiliary source circuit, and a bleeder circuit of the auxiliary source circuit according to any embodiment of the first aspect.
The bleeder circuit and the energy storage system of the auxiliary source circuit are used for outputting a first level signal when an input source of the auxiliary source circuit is in an access state or bus voltage of the auxiliary source circuit is smaller than a first preset voltage; outputting a second level signal when the input source of the auxiliary source circuit is in a unplugged state and the bus voltage of the auxiliary source circuit is greater than or equal to a first preset voltage value; and the discharging module is used for stopping working under the control of the first level signal, working under the control of the second level signal and releasing the bus voltage. According to the scheme, in the bleeder circuit of the auxiliary source circuit, when the input source of the auxiliary source circuit is in the access state, the bleeder module is controlled by the first level signal to not release the bus voltage, and when the input source of the auxiliary source circuit is in the unplugged state and the bus voltage of the auxiliary source circuit is greater than or equal to the first preset voltage value, the bleeder module is controlled by the second level signal to release the bus voltage until the bus voltage is smaller than the first preset voltage, and when the bleeder module is controlled by the first level signal again to not release the bus voltage, so that after the input source of the auxiliary source circuit is switched from the access state to the unplugged state, the bus voltage can be quickly released to be lower than the first preset voltage, and the auxiliary source is prevented from being activated or flashing.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the related art, the drawings that are required to be used in the embodiments or the related technical descriptions will be briefly described, and it is apparent that the drawings in the following description are only some embodiments of the present application, and other drawings may be obtained according to the drawings without inventive effort for those skilled in the art.
FIG. 1 is a schematic diagram of a bleeder circuit 10 for an auxiliary source circuit;
FIG. 2 is a schematic diagram of a first energy storage system;
FIG. 3 is a schematic diagram of a second embodiment of an energy storage system;
FIG. 4 is a schematic diagram of an AC activation and discharge circuit;
Fig. 5 is a schematic diagram of a bleed control module 11.
Detailed Description
The present application will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present application more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the application.
According to the bleeder circuit and the energy storage system of the auxiliary source circuit, after the input source of the auxiliary source circuit is switched from the access state to the unplugged state, the bus voltage can be quickly released to be lower than the first preset voltage, so that the auxiliary source is prevented from being activated or flashing after the auxiliary source circuit is turned off.
In one exemplary embodiment, as shown in fig. 1, a schematic diagram of a bleeder circuit 10 of a secondary source circuit is provided, the bleeder circuit 10 of the secondary source circuit comprising:
The bleeder control module 11 is configured to output a first level signal when an input source of the auxiliary source circuit is in an on state or a bus voltage of the auxiliary source circuit is less than a first preset voltage; outputting a second level signal when the input source of the auxiliary source circuit is in a unplugged state and the bus voltage of the auxiliary source circuit is greater than or equal to a first preset voltage value; the bleeder module 12 is used for stopping working under the control of the first level signal and working under the control of the second level signal, so as to release the bus voltage.
The first preset voltage value is a voltage value capable of activating the auxiliary source.
In the above-mentioned bleeder circuit of auxiliary source circuit, because in the bleeder circuit of auxiliary source circuit, when the input source of auxiliary source circuit is in the access state, can control the bleeder module through first level signal and do not release the busbar voltage to be less than first preset voltage, and when the input source of auxiliary source circuit is in the state of pulling out and the busbar voltage of auxiliary source circuit is greater than or equal to first preset voltage value, control the bleeder module through second level signal and release the busbar voltage, when the busbar voltage is less than first preset voltage, control the bleeder module again through first level signal and do not release the busbar voltage to be less than first preset voltage, thereby can make after the input source of auxiliary source circuit switches over to the state of pulling out from the access state, can quickly release the busbar voltage to be less than first preset voltage, in order to avoid auxiliary source to be activated or the phenomenon of flashing.
In some embodiments, fig. 2 is a schematic diagram of an energy storage system. Referring to fig. 1, as shown in fig. 2, the bleeder module 12 in fig. 1 is connected to the bus voltage end 131 of the auxiliary source circuit 103 and the secondary winding 141 of the transformer 14 in the auxiliary source circuit 103, and the control end of the bleeder module 12 is connected to the bleeder control module 11;
the secondary winding 141 of the transformer 14 is coupled to the primary winding 142 of the transformer 14, the primary winding 142 of the transformer 14 is connected to the bus voltage end 131, and the bleeder control module 11 is configured to bleeder the bus voltage through the voltage coupled to the secondary winding 141 by the primary winding 142 under the control of the second level signal.
In the bleeder circuit of the auxiliary source circuit, when the input source of the auxiliary source circuit is in the unplugged state and the bus voltage of the auxiliary source circuit is larger than or equal to the first preset voltage value, the second level signal is used for controlling the bus voltage to be discharged through the bleeder module after being coupled to the secondary winding through the primary winding until the bus voltage is smaller than the first preset voltage, so that the bus voltage can be quickly released to be lower than the first preset voltage after the input source of the auxiliary source circuit is switched from the connected state to the unplugged state, and the auxiliary source is prevented from being activated or flashing.
In some embodiments, fig. 3 is a schematic diagram of a second energy storage system. Referring to fig. 2, as shown in fig. 3, the bleeder circuit 10 of the auxiliary source circuit further includes: the activation control module 15 is configured to control the bleeder module 12 to be connected to the secondary winding 141 of the transformer 14 when the input source of the auxiliary source circuit 103 is in the on state and when the input source of the auxiliary source circuit 103 is in the off state and the bus voltage is greater than or equal to a first preset voltage value; when the bus voltage is less than the first preset voltage value, the control bleed module 12 is disconnected from the secondary winding 141 of the transformer 14.
The activation control module 15 is connected to the bleeder module 12 and the secondary winding 141 of the transformer 14, and a control end of the activation control module 15 is connected to the bus voltage end 131 of the auxiliary source circuit 103.
It should be noted that, when the activation control module controls the bleeder module to be connected with the secondary winding of the transformer, the voltage coupled to the secondary winding of the transformer may activate the auxiliary source; when the activation control module controls the bleeder module to be disconnected from the secondary winding of the transformer, the voltage coupled to the secondary winding of the transformer does not activate the auxiliary power supply.
In some embodiments, the number of turns of the primary winding is greater than the number of turns of the secondary winding.
In some embodiments, as shown in fig. 4, a schematic diagram of an AC activation and discharge circuit is shown, and the bleeder module 12 in fig. 3 includes the following components as shown in fig. 4: a first diode D9, a first switching tube Q3, and a first resistor R26; the anode of the first diode D9 (i.e., pin 1 of D9 in fig. 4) is connected to pin 1 of the capacitor CE4 and pins 4 and 5 of the transformer T1, the cathode of the first diode D9 (i.e., pin 2 of D9 in fig. 4) is connected to the first end of the first switching tube Q3 (i.e., pin 2 of Q3 in fig. 4), the control end of the first switching tube Q3 (i.e., pin 1 of Q3 in fig. 4) is connected to the bleed control module 11 shown in fig. 3, the second end of the first switching tube Q3 (i.e., pin 3 of Q3 in fig. 4) is connected to one end of the first resistor R26, and the other end of the first resistor R26 is grounded.
As shown in fig. 4, the activation control module 15 in fig. 3 described above includes as shown in fig. 4: a second switching tube Q2, a third switching tube Q5, a second diode D7 and a third diode D8; the anode of the second diode D7 (i.e., pin 1 of D7 in fig. 4) is connected to pins 4 and 5 of the transformer T1, and the cathode of the second diode D7 is connected to the first end of the second switching tube Q2 (i.e., pin 2 of Q2 in fig. 4); the second end of the second switching tube (i.e. the pin 3 of Q2 in fig. 4) is connected to the anode of the third diode D8, and the control end of the second switching tube Q2 (i.e. the pin 1 of Q2 in fig. 4) is connected to the first end of the third switching tube Q5 (i.e. the pin 3 of Q5 in fig. 4); the control end (i.e. pin 1 of Q5 in fig. 4) of the third switching tube is connected to pin 1 of the capacitor CE4, and the second end (i.e. pin 2 of Q5 in fig. 4) of the third switching tube is grounded; the cathode of the third diode D8 is connected to pin 1 of the capacitor CE4 and to the bleeder module 12 shown in fig. 3.
The pin 1 of the capacitor CE4 in fig. 4 is the bus voltage end 131 of the auxiliary source circuit 103 in fig. 3, the pins 4 and 5 of the transformer T1 in fig. 4 are the secondary windings 141 of the transformer 14 in fig. 3, and the pins 1 and 2 of the transformer T1 in fig. 4 are the primary windings 142 of the transformer 14 in fig. 3. In fig. 4, p+on (also denoted as p+_on) is the voltage of the control terminal of Q3, where when p+ is greater than or equal to the first preset voltage, p+_on is a low level signal, and at this time, Q3 may be controlled to be turned ON to release the electric quantity of the capacitor CE4, and when p+ is less than the first preset voltage, p+_on is a high level signal, and at this time, Q3 may be controlled to be turned off to not release the electric quantity of the capacitor CE 4.
Note that, Q2 and Q5 in the circuit of fig. 4 may be controlled in a coordinated manner, and the coordinated control of Q2 and Q5 has the following functions: when the input source of the auxiliary source circuit is in the on state and when the input source of the auxiliary source circuit is in the off state and the bus voltage is greater than or equal to the first preset voltage value, the control bleeder module 12 is connected with the secondary winding 141 of the transformer 14 by controlling the conduction of Q2 and Q5 in the circuit of fig. 4, and the voltage coupled to the secondary winding 141 of the transformer 14 can activate the auxiliary source. When the bus voltage is less than the first preset voltage value, the circuit of fig. 4 is controlled to disconnect the bleeder module 12 from the secondary winding 141 of the transformer 14 by controlling Q2 and Q5 to be disconnected, and the voltage coupled to the secondary winding 141 of the transformer 14 does not activate the auxiliary power supply.
In some embodiments, the activation control module 15 in fig. 3 described above may also include resistors R19, R20, R21, R24, R28, R29, and capacitors C9 and C11 as shown in fig. 4.
It should be noted that, in fig. 4, other devices shown in fig. 4 may be devices in the auxiliary source circuit 103 shown in fig. 3, except for the devices included in the above-mentioned bleeder module 12 and the activation control module 15.
The transformer T1 in fig. 4 includes, in addition to the primary windings corresponding to the pins 1 and 2 and the secondary windings corresponding to the pins 4 and 5, other windings, such as the windings corresponding to the pins 6 and 7, the windings corresponding to the pins 8 and 10, the windings corresponding to the pins 11 and 12, and the windings corresponding to the pins 13, 9 and 14 shown in fig. 4. P+ in fig. 4 represents the voltage of pin 1 of the capacitor CE4, that is, the bus voltage of the secondary source circuit. P-in fig. 4 may refer to ground voltage, BGD BUS represents ground, GRID-L represents the hot line of the input source of the auxiliary source circuit, and GRID-N represents the neutral line of the input source of the auxiliary source circuit.
In fig. 4, RT1 represents a thermistor; DB1 represents a device composed of four diodes; LC1 represents a resonant circuit; u2 is the voltage regulation chip, and this voltage regulation chip U2 is including following pin:
VDD: the power supply pin is used for providing the working voltage of the chip.
INV: is the inverting input pin of the error amplifier in the voltage regulating chip U2.
COMP: the output pin of the error amplifier in the voltage regulating chip U2 is usually used to connect to an external compensation network to stabilize the feedback control loop of the voltage regulating chip.
CS: the current detection pin is used for monitoring the current flowing through the voltage regulating chip.
DRAIN: the drain pin of the power MOS transistor is typically connected to an external inductor or load.
GND: is the ground pin of the chip and is used for providing the reference ground of the circuit.
In some embodiments, the bleed control module 11 shown in fig. 1-3 above includes: the first control module is used for outputting a first level signal when the input source of the auxiliary source circuit is in an access state, and outputting a second level signal after the input source of the auxiliary source circuit is switched from the access state to the unplugged state; the second control module is used for outputting the second level signal when the bus voltage is greater than or equal to a first preset voltage value after the input source of the auxiliary source circuit is switched from the access state to the unplugged state, and outputting the first level signal when the bus voltage is less than the first preset voltage value; the first level signal is a high level signal, and the second level signal is a low level signal.
In some embodiments, the input source of the first control module is the input source of the auxiliary source circuit, and the output of the first control module is connected to the bleeder module 12 shown in fig. 1-3; the input end of the second control module is a bus voltage end of the auxiliary source circuit, and the output end of the second control module is connected with the output end of the first control module and the discharge module.
In some embodiments, the first control module comprises: a first comparator. In some embodiments, the second control module includes: a second comparator and a third comparator.
In some embodiments, as shown in fig. 5, a schematic diagram of a bleed control module 11 is provided. As can be seen from fig. 5, the bleed-off control module 11 comprises: the first control module and the second control module, wherein the first control module includes: the first comparator U4B, the second control module includes: a second comparator U4A and a third comparator U3A.
Wherein, the first input end (i.e. pin 5) of the first comparator U4B is connected to the live wire GRID-L of the input source of the auxiliary source circuit, the second input end (i.e. pin 6) of the first comparator U4B is connected to the zero wire GRID-N of the input source of the auxiliary source circuit, and the output end (i.e. pin 7) of the first comparator U4B is connected to the output end (i.e. pin 1) of the second comparator U4A and the bleeder module 12 as shown in fig. 3.
The first input end (i.e. the pin 3) of the second comparator U4A is connected with the bus voltage end (i.e. the voltage is P+) of the auxiliary source circuit, the second input end (i.e. the pin 2) of the second comparator U4A is grounded (i.e. the voltage is P-), and the output end (i.e. the pin 1) of the second comparator U4A is connected with the second input end of the third comparator U3A;
the first input end (i.e., pin 2) of the third comparator U3A is connected to the target voltage end, and the output end (i.e., pin 1) of the third comparator U3A is connected to the output end of the first comparator U4B and the bleeder module 12 as shown in fig. 3;
The voltage value of the target voltage terminal is a second preset voltage value. As shown in fig. 5, the second preset voltage value is 3.3V, and the voltage value passes through the resistor R18, so that the voltage at the first input terminal of the third comparator U3A is 1.2V. When p+ is 65V, the voltage corresponding to AD p+ (also denoted as ad_p+) in fig. 5 is 1.2V.
Illustratively, in the first control module, the first control module may further include, in addition to the first comparator U4B shown in fig. 5: resistors R53, R54, R55, R56, capacitors C23, C25, and diode D13.
Illustratively, in the second control module, in addition to the second comparator U4A and the third comparator U3A as shown in fig. 5, it may further include: resistors R18, R44, R45, R46, R47, R48, R49, R50, R51, R52, capacitors C13, C20, C21, C22, C24, C26, C27. Wherein the second comparator U4A and the third comparator U3A each comprise a 4 pin and an 8 pin, wherein the 4 pin is grounded and the 8 pin is connected to a fixed voltage terminal, which may be 5V, for example, as shown in fig. 5.
As shown in fig. 4, when the input source of the auxiliary source circuit is in the on state (i.e., GRID-L, GRID-N on), the capacitor CE4 is charged and the entire auxiliary source circuit operates. When the input source is pulled out, namely, the input source of the auxiliary source circuit is switched from the access state to the pull-out state, the voltage of the capacitor CE4 (namely, the bus voltage) can be immediately released through the loop resistor R26, and the phenomenon that the auxiliary source is activated or flashes due to the discharging of the CE4 after shutdown can be avoided.
The capacitor CE4 may be an electrolytic capacitor.
For example, when the capacitance of the capacitor CE4 is 15uF and the maximum dc operating voltage that can be sustained is 400V, the capacitor CE4 may be charged to about 141.4V when the input source of the auxiliary source circuit is in the on state.
In the present application, the specific operation mode of charging and discharging the capacitor CE4 is as follows:
When GRID-L and GRID-N are connected (AC may be 100V), capacitor CE4 is charged through RT1, DB1, LC1 and CE4 shown in fig. 4, p+ (141.4V) is divided by R10, R13 and R25, and then reaches pin 1 of U2, i.e., VDD, through D9, at this time U2 is awakened to be started, at this time p+ makes voltage to Q5 through R28 and R29, and Q5 is controlled to be turned on. The voltage across R24 is pulled low after Q5 turns on, controlling Q2 to turn on; the current of pins 4 and 5 of transformer T1 reaches pin 1 of U2, namely VDD, through R19, D7, Q2, D8, D9, and at this time U2 is normally started and the auxiliary source is normally operated.
As shown in fig. 5, when the input source of the auxiliary source circuit is in the on state, the voltages input by the pins 5 and 6 of the first comparator U4B are GRID-L and GRID-N, and at this time, the voltage of the pin 7 of the first comparator U4B is pulled up, i.e. the sampling voltage GRID-l_en is a high level signal.
As shown in fig. 5, when the input source of the auxiliary source circuit is in the ON state, pins 2 and 3 of the second comparator U4A detect that the p+ voltage (1.2V corresponds to p+65v) is compared with the voltage of pin 3 of the third comparator U3A, and when p+ is greater than 65V, the third comparator U3A turns over, and pin 1 of the third comparator U3A is a low level signal, but at this time, since the input source of the auxiliary source circuit is in the ON state, the sampling voltage GRID-l_en is a high level signal, and thus p++ ON is a high level signal. Q3 can be controlled to be turned off by the high level signal, and Q3 is not operated at this time, and capacitor CE4 is not discharged.
As shown in fig. 5, after GRID-L and GRID-N are pulled out in the power GRID (i.e., after the input source of the auxiliary source circuit is switched from the on state to the pulled-out state), the voltage of pin 5 and pin 6 of the first comparator U4B is not input, and the voltage of pin 7 is pulled down, i.e., the sampling voltage GRID-l_en is a low level signal.
As shown in fig. 5, when GRID-L and GRID-N are pulled out instantaneously (i.e. the input source of the auxiliary source circuit just switches from the on state to the pulled-out state), the p+ voltage (141.4V) passes through R28, R29 and reaches Q5 due to CE4, so as to control Q5 to be turned on. The voltage across R24 is pulled low after Q5 turns on, which may control Q2 to turn on. As shown in fig. 5, the sampling voltage GRID-l_en is a low level signal after the power GRID is removed, the p+ and P-voltage sampling signal ad_p+ is greater than 1.2V, at this time, the voltage of the pin 2 of the third comparator U3A is greater than the voltage of the pin 3, the third comparator U3A turns over, the pin 1 of the third comparator U3A outputs a low level signal, and the Q3 is controlled to be turned on by the low level signal. The current of pins 4 and 5 of transformer T1 flows into P-through R19, D7, Q2, D8, D9, Q3, R26 when Q3 is on, since the current of pins 4 and 5 of transformer T1 is now obtained through pins 1 and 2 of transformer T1 and pins 1 and 2 of transformer T1 are connected to capacitor CE4, capacitor CE4 can be discharged through pins 4 and 5 of transformer T1. Wherein, because the R26 resistance is very small, the voltage at the two ends of P+ is quickly discharged; when p+ is lower than 65V, the voltage of the pin 2 of the third comparator U3A is smaller than the voltage of the pin 3, the comparator does not flip, and at this time, the voltage of the pin 1 of the third comparator U3A is pulled up, that is, the sampling voltage p+_on is a high level signal, and at this time, the first switching tube Q3 is controlled to be turned off. Thereby avoiding the phenomenon that the system is activated again after the shutdown.
For example, the resistance of R26 may be set to be less than or equal to 2.2 ohms.
For example, Q3 may be a PNP transistor, Q2 may be a PNP transistor, and Q5 may be an NPN transistor.
For example, the resistance values of R10 and R13 are kΩ. For example, the resistance values of R10 and R13 are M Ω. Illustratively, the resistance of R19 is substantially less than the resistance of R10 or R13. Illustratively, the R19 has a resistance less than 1/50 of the resistance of R10 or R13.
The technical features of the above embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.
The foregoing examples illustrate only a few embodiments of the application and are described in detail herein without thereby limiting the scope of the application. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the application, which are all within the scope of the application. Accordingly, the scope of the application should be assessed as that of the appended claims.
Claims (10)
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| CN103236787A (en) * | 2013-04-12 | 2013-08-07 | 矽力杰半导体技术(杭州)有限公司 | Capacity discharge method and circuit |
| CN104980036A (en) * | 2015-06-30 | 2015-10-14 | 广东欧珀移动通信有限公司 | Fly-back switch power supply circuit |
| US20170288558A1 (en) * | 2016-04-04 | 2017-10-05 | Microsoft Technology Licensing, Llc | Voltage discharge circuit |
| CN113224932A (en) * | 2020-02-04 | 2021-08-06 | 富士电机株式会社 | Switch control circuit and power supply circuit |
| CN114513116A (en) * | 2022-02-17 | 2022-05-17 | 深圳市必易微电子股份有限公司 | Shutdown protection circuit, shutdown protection method and self-powered system |
| CN117458848A (en) * | 2023-12-26 | 2024-01-26 | 西安荣耀终端有限公司 | Power bus bleeder circuit, display device and power adapter |
-
2024
- 2024-07-09 CN CN202410912300.0A patent/CN118487485B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103236787A (en) * | 2013-04-12 | 2013-08-07 | 矽力杰半导体技术(杭州)有限公司 | Capacity discharge method and circuit |
| CN104980036A (en) * | 2015-06-30 | 2015-10-14 | 广东欧珀移动通信有限公司 | Fly-back switch power supply circuit |
| US20170288558A1 (en) * | 2016-04-04 | 2017-10-05 | Microsoft Technology Licensing, Llc | Voltage discharge circuit |
| CN113224932A (en) * | 2020-02-04 | 2021-08-06 | 富士电机株式会社 | Switch control circuit and power supply circuit |
| CN114513116A (en) * | 2022-02-17 | 2022-05-17 | 深圳市必易微电子股份有限公司 | Shutdown protection circuit, shutdown protection method and self-powered system |
| CN117458848A (en) * | 2023-12-26 | 2024-01-26 | 西安荣耀终端有限公司 | Power bus bleeder circuit, display device and power adapter |
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| CN118487485B (en) | 2024-11-26 |
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