Novel discharging circuit

Abstract

The utility model discloses a novel discharge circuit comprising a DSP, a diode D1, a diode D2, a diode D3, a diode D4, a diode D5, a diode D6, a diode D7, a diode D8, a discharge switch S1, a switch S2, a switch S3, a switch S4, a resistor R2, a resistor R3, a resistor R6, a resistor R7, a resistor R9, a resistor R10, a resistor R11, a resistor R17, a capacitor C2, a capacitor C7, a capacitor C8 and a capacitor C9. The beneficial effects are that a multi-stage discharge mode is adopted, and continuous control of a DSP is not needed. The voltage of the divider resistor, namely the driving voltage of the discharge switch S1, is gradually reduced along with the gradual reduction of the voltage of the output capacitor, and when the voltage is reduced to be below the conduction threshold voltage of the discharge switch S1, the second-stage divider resistor is switched in, and the discharge switch S1 is conducted again to continue discharging, and so on. And due to the arrangement of the multi-stage divider resistor, when the output voltage is continuously powered down, the holding circuit keeps working within a specified time and is quickly discharged.

Description

Technical Field

[0001] The utility model relates to the technical field of power supply output capacitor discharge, in particular to a novel discharge circuit. Background Art

[0002] There is a huge demand for high-power power supplies in industrial production. In order to ensure the smooth and reliable operation of high-power power supplies, a large number of capacitors are added to the output end of the power supply. When the power is turned off, if the power of these capacitors cannot be discharged in time, reliable power off cannot be achieved, and it may even cause the risk of electric shock.

[0003] The current processing method is: 1. Connect the resistor in parallel with the output capacitor. Connect the resistor directly in parallel at both ends of the output capacitor. When the power supply is turned off, the electric energy on the output capacitor is quickly consumed through the resistor, so that the output voltage can quickly drop to the specified value within the specified time. However, because the resistor is always connected in parallel at both ends of the output, additional losses will be generated when the power supply is working normally, which reduces the overall efficiency. 2. Also connect the resistor in parallel at both ends of the output capacitor, but connect a switch tube in series in the resistor loop. The switch tube is controlled by the DSP to turn on and off. The switch tube is turned off during normal operation, and the resistor will not generate losses. When the power supply is turned off, the switch tube is turned on to quickly discharge the output capacitor. However, because the DSP is required to control the on and off of the switch tube, the power supply of the DSP needs to be maintained all the time. Generally, the power supply of the DSP is provided by the input, which requires that the power input cannot be powered off. If the shutdown operation is triggered by the enable pin, discharge can still be achieved. If the shutdown operation is triggered by a direct input power failure, the rapid discharge function cannot be completed.

[0004] Currently, no effective solution has been proposed for the problems in the related technologies. Utility Model Content

[0005] In view of the problems in the related art, the utility model proposes a novel discharge circuit to overcome the above technical problems existing in the existing related art.

[0006] To this end, the specific technical solutions adopted by the utility model are as follows:

[0007] A novel discharge circuit includes a DSP, a diode D1, a diode D2, a diode D3, a diode D4, a diode D5, a diode D6, a diode D7, a diode D8, a discharge switch S1, a switch S2, a switch S3, a switch S4, a resistor R2, a resistor R3, a resistor R6, a resistor R7, a resistor R9, a resistor R10, a resistor R11, a resistor R17, a capacitor C2, a capacitor C7, a capacitor C8 and a capacitor C9;

[0008] One end of the diode D6 is connected to the DSP, the other end of the diode D6 is respectively connected to the diode D7, the diode D5 and the switch S2, one end of the switch S2 is respectively connected to the resistor R9, the diode D1, the resistor R2 and the capacitor C8, the other end of the resistor R9 is connected to the resistor R3, the capacitor C2 and the resistor R7;

[0009] The other end of the diode D1 is connected to the diode D8, the diode D3 and the resistor R10 respectively, the other end of the diode D8 is connected to the other end of the resistor R11, the resistor R17, the capacitor C9 and the switch S3 respectively, the other end of the switch S3 is connected to the diode D2 and the diode D4 respectively, and the other end of the diode D4 is connected to the DSP;

[0010] The other end of the diode D3 is connected to the capacitor C7, the resistor R6 and the switch S4 respectively, one end of the switch S4 is connected to the DSP, the other end of the resistor R10 is connected to the discharge switch S1, and one end of the discharge switch S1 is connected to the other end of the resistor R7;

[0011] One end of the switch S2 is respectively connected to the other end of the resistor R2, the other end of the capacitor C8, one end of the switch S3, the other end of the resistor R17, the other end of the capacitor C9, the switch S3, the other end of the capacitor C7, the other end of the resistor R6 and the discharge switch S1.

[0012] Preferably, when the power is turned off, enabling shutdown or power failure will cause the DSP signal to be zero.

[0013] Preferably, the driving voltage of the discharge switch S1 is provided by the voltage of the output capacitor through resistor voltage division, and the voltage dividing resistor is connected in parallel to control the switch S2.

[0014] Preferably, when the power is turned off, whether it is enabled shutdown or power-off shutdown, the DSP pin will be set low to control the switch S2 to be turned off, and the resistor voltage divider drives the discharge switch S1 to be high.

[0015] Preferably, the discharge switch S1 , the switch S2 , the switch S3 , and the switch S4 are all grounded.

[0016] Preferably, the other end of the capacitor C2 is grounded.

[0017] The beneficial effects of the utility model are as follows: a multi-stage discharge method is adopted, and continuous control of the DSP is not required. The driving voltage of the discharge switch S1 is provided by the voltage of the output capacitor through a resistor divider, and the voltage divider resistor controls the switch S2 in parallel. When discharge is not required, the DSP pin is set high to control the switch S2 to be turned on, and the driving voltage of the discharge switch tube S1 is pulled down; when the power is turned off, whether it is enabled shutdown or power-off shutdown, the DSP pin will be set low to turn off the control switch S2, and the resistor divider drives the discharge switch S1 to high, and the discharge resistor is connected to discharge the output capacitor. As the voltage of the output capacitor gradually decreases, the voltage of the voltage divider resistor, that is, the driving voltage of the discharge switch S1, gradually decreases. When this voltage drops below the discharge switch S1 conduction threshold voltage, the second-stage voltage divider resistor is cut in, and the discharge switch S1 is turned on again to continue discharging, and so on. The setting of the multi-stage voltage divider resistor allows the output voltage to be continuously powered off, and the circuit is maintained to work within the specified time to quickly discharge.

[0018] This discharge method does not work when the power supply is operating normally, so no additional loss will be generated. Moreover, this discharge method is not constrained by input power failure and can discharge reliably and quickly.

[0019] Compared with directly connecting the discharge resistor in parallel with the output, no additional loss is added when the power supply is working normally;

[0020] Compared with using DSP to directly control the discharge switch tube, the discharge will not be restricted by the power shutdown mode;

[0021] Multi-stage discharge allows the discharge circuit to keep working when the output voltage continues to drop, achieving rapid discharge within the specified time. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0023] Figure 1 It is a circuit diagram of a novel discharge circuit according to an embodiment of the utility model. DETAILED DESCRIPTION

[0024] To further illustrate each embodiment, the present invention provides drawings, which are part of the disclosure of the present invention and are mainly used to illustrate the embodiments. They can be used in conjunction with the relevant descriptions in the specification to explain the operating principles of the embodiments. With reference to these contents, ordinary technicians in the field should be able to understand other possible implementation methods and advantages of the present invention. The components in the figures are not drawn to scale, and similar component symbols are generally used to represent similar components.

[0025] According to an embodiment of the utility model, a novel discharge circuit is provided.

[0026] Embodiment 1;

[0027] like Figure 1 As shown, the new discharge circuit according to the embodiment of the utility model includes DSP, diode D1, diode D2, diode D3, diode D4, diode D5, diode D6, diode D7, diode D8, discharge switch S1, switch S2, switch S3, switch S4, resistor R2, resistor R3, resistor R6, resistor R7, resistor R9, resistor R10, resistor R11, resistor R17, capacitor C2, capacitor C7, capacitor C8 and capacitor C9;

[0028] One end of the diode D6 is connected to the DSP, the other end of the diode D6 is respectively connected to the diode D7, the diode D5 and the switch S2, one end of the switch S2 is respectively connected to the resistor R9, the diode D1, the resistor R2 and the capacitor C8, the other end of the resistor R9 is connected to the resistor R3, the capacitor C2 and the resistor R7;

[0029] The other end of the diode D1 is connected to the diode D8, the diode D3 and the resistor R10 respectively, the other end of the diode D8 is connected to the other end of the resistor R11, the resistor R17, the capacitor C9 and the switch S3 respectively, the other end of the switch S3 is connected to the diode D2 and the diode D4 respectively, and the other end of the diode D4 is connected to the DSP;

[0030] The other end of the diode D3 is connected to the capacitor C7, the resistor R6 and the switch S4 respectively, one end of the switch S4 is connected to the DSP, the other end of the resistor R10 is connected to the discharge switch S1, and one end of the discharge switch S1 is connected to the other end of the resistor R7;

[0031] One end of the switch S2 is respectively connected to the other end of the resistor R2, the other end of the capacitor C8, one end of the switch S3, the other end of the resistor R17, the other end of the capacitor C9, the switch S3, the other end of the capacitor C7, the other end of the resistor R6 and the discharge switch S1.

[0032] During normal operation, the DSP signal is high. Figure 1 The switches S2, S3, and S4 are turned on, short-circuiting the voltage-dividing resistors R2, R17, and R6. At this time, the discharge switch S1 is driven to zero, the discharge resistor R7 is not connected to the circuit, and the discharge function is not enabled, which will not cause additional circuit loss. When the power is turned off, enabling shutdown or power failure will make the DSP signal zero. At this time, the switches S2, S3, and S4 are driven low. Since C7 is much smaller than C8 and C9, the voltage of Vstep1 is first charged high, and the first-level discharge is enabled. At this time, the S1 drive voltage Vstep1 is the voltage-dividing value of R6 and R3, and the discharge resistor R7 is connected to the circuit to start discharging, and the switches S2 and S3 are turned on again, and the voltage-dividing resistors R2 and R17 of the subsequent stage are short-circuited. As the output voltage continues to decrease, the voltage-dividing value Vstep1 of R6 and R3 is lower than the threshold of the discharge switch S1. Since the threshold of the switch tube S3 is the same as that of the discharge switch S1, the drive of the switch S3 is also set low at this time, so the voltage of Vstep2 is charged high, and the second-stage discharge is enabled. At this time, the S1 drive voltage Vstep2 is the voltage-dividing value of R17 and R11, and the discharge resistor R7 is connected to the circuit again to continue discharging, while the switch S3 continues to be turned on, and the voltage-dividing resistor R2 of the latter stage is short-circuited. By analogy, a multi-stage discharge circuit can be added so that when the output voltage continues to lose power, the circuit can be maintained to work and quickly discharge within the specified time.

[0033] Embodiment 2:

[0034] like Figure 1 As shown, when the power is turned off, enabling shutdown or power failure will make the DSP signal zero, the driving voltage of the discharge switch S1 is provided by the voltage of the output capacitor through a resistor divider, and the voltage divider resistor controls the switch S2 in parallel. When the power is turned off, whether it is enabling shutdown or power failure shutdown, the DSP pin will be set low to control the switch S2 to be turned off, and the resistor divider drives the discharge switch S1 high. The discharge switch S1, the switch S2, the switch S3, and the switch S4 are all grounded, and the other end of the capacitor C2 is grounded.

[0035] In summary, with the help of the above technical solution of the utility model, a multi-stage discharge method is adopted, and continuous control of DSP is not required. The driving voltage of the discharge switch S1 is provided by the voltage of the output capacitor through a resistor divider, and the voltage divider resistor controls the switch S2 in parallel. When discharge is not required, the DSP pin is set high to control the switch S2 to turn on, and the driving voltage of the discharge switch tube S1 is pulled down; when the power is turned off, whether it is enabled to shut down or power off, the DSP pin will be set low to turn off the control switch S2, and the resistor divider drives the discharge switch S1 to high, and the discharge resistor is connected to discharge the output capacitor. As the voltage of the output capacitor gradually decreases, the voltage of the voltage divider resistor, that is, the driving voltage of the discharge switch S1, gradually decreases. When this voltage drops below the discharge switch S1 conduction threshold voltage, the second-stage voltage divider resistor is cut in, and the discharge switch S1 is turned on again to continue discharging, and so on. The setting of the multi-stage voltage divider resistor allows the output voltage to be continuously powered off, and the circuit is maintained to work within the specified time to quickly discharge.

[0036] This discharge method does not work when the power supply is operating normally, so no additional loss will be generated. Moreover, this discharge method is not constrained by input power failure and can discharge reliably and quickly.

[0037] Compared with directly connecting the discharge resistor in parallel with the output, no additional loss is added when the power supply is working normally;

[0038] Compared with using DSP to directly control the discharge switch tube, the discharge will not be restricted by the power shutdown mode;

[0039] Multi-stage discharge allows the discharge circuit to keep working when the output voltage continues to drop, achieving rapid discharge within the specified time.

[0040] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A novel discharge circuit, characterized in that: Including DSP, diode D1, diode D2, diode D3, diode D4, diode D5, diode D6, diode D7, diode D8, discharge switch S1, switch S2, switch S3, switch S4, resistor R2, resistor R3, resistor R6, resistor R7, resistor R9, resistor R10, resistor R11, resistor R17, capacitor C2, capacitor C7, capacitor C8 and capacitor C9; One end of the diode D6 is connected to the DSP, the other end of the diode D6 is respectively connected to the diode D7, the diode D5 and the switch S2, one end of the switch S2 is respectively connected to the resistor R9, the diode D1, the resistor R2 and the capacitor C8, the other end of the resistor R9 is connected to the resistor R3, the capacitor C2 and the resistor R7; The other end of the diode D1 is connected to the diode D8, the diode D3 and the resistor R10 respectively, the other end of the diode D8 is connected to the other end of the resistor R11, the resistor R17, the capacitor C9 and the switch S3 respectively, the other end of the switch S3 is connected to the diode D2 and the diode D4 respectively, and the other end of the diode D4 is connected to the DSP; The other end of the diode D3 is connected to the capacitor C7, the resistor R6 and the switch S4 respectively, one end of the switch S4 is connected to the DSP, the other end of the resistor R10 is connected to the discharge switch S1, and one end of the discharge switch S1 is connected to the other end of the resistor R7; One end of the switch S2 is respectively connected to the other end of the resistor R2, the other end of the capacitor C8, one end of the switch S3, the other end of the resistor R17, the other end of the capacitor C9, the switch S3, the other end of the capacitor C7, the other end of the resistor R6 and the discharge switch S1.

2. A novel discharge circuit according to claim 1, characterized in that: The driving voltage of the discharge switch S1 is provided by the voltage of the output capacitor through resistor voltage division, and the voltage dividing resistor is connected in parallel to control the switch S2.

3. A novel discharge circuit according to claim 1, characterized in that: The discharge switch S1 , the switch S2 , the switch S3 , and the switch S4 are all grounded.

4. A novel discharge circuit according to claim 1, characterized in that: The other end of the capacitor C2 is grounded.

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