Farad capacitor protection circuit, control module and electronic equipment

Abstract

The utility model discloses a farad capacitor protection circuit, a control module and electronic equipment, relates to the technical field of electronics, is used for the control module adopting a time-sharing power-on anti-latch control mechanism, and comprises a first control switch, a second control switch and a voltage reference unit, a first end of the first control switch is connected with a positive electrode of a farad capacitor, a second end of the first control switch is connected with an internal main power supply end, and the internal main power supply end is connected with the control module; the input end of the second control switch is connected with the internal main power supply end, and the output end of the second control switch is connected with the control end of the first control switch; the voltage reference unit is connected with the control end of the second control switch and the internal main power supply end, and is used for controlling the connection state of the second control switch based on the voltage of the internal main power supply end. Therefore, the problem of abnormal oscillation circulation can be avoided, and the service life of the farad capacitor is prolonged.

Description

TECHNICAL FIELD

[0001] The utility model relates to electronic technical field especially is a kind of farad capacitor protection circuit, control module and a kind of electronic equipment. BACKGROUND

[0002] Control module is a kind of module integrated with multiple electronic components and circuit, for controlling, monitoring and managing system or equipment. Many control modules will adopt the anti-latch control mechanism of time-sharing power-on, first power-on the core part (such as processor, storage unit, etc.) of control module, and the peripheral peripherals (such as sensor, man-machine interaction device, execution component, etc.) of control module are powered on by the control signal sent by the core part of control module after power-on, to avoid the current of peripheral peripherals part of control module from pouring into the core part of control module due to simultaneous power-on, resulting in latch abnormality, unable to start or damage the equipment.

[0003] At present, the circuit of anti-latch control of time-sharing power-on is usually configured with a farad capacitor for continuous power supply after the front-end external power supply is powered off, but when the front-end power supply is powered off and the supply voltage of the farad capacitor is lower than the minimum supply voltage of the control module, the control module will control to close the power supply of peripheral peripherals and prepare to shut down, but the peripheral peripherals are powered off, the voltage of the farad capacitor rises and exceeds the minimum supply voltage of the control module, the control module will control to supply power to the peripheral peripherals again, the voltage of the farad capacitor is quickly pulled down, and the control module reenters the state of preparing to shut down, resulting in that the equipment needing to be powered off is in a shock cycle, causing abnormal operation of the equipment, and even the hardware of the core part of the control module may be damaged. UTILITY MODEL CONTENTS

[0004] Based on the above problems, the utility model provides a farad capacitor protection circuit, a control module and an electronic device to solve the problem of setting farad capacitor for control module adopting anti-latch control mechanism of time-sharing power-on, causing power-off and power-on shock cycle.

[0005] The utility model embodiment discloses the following technical scheme:

[0006] In a first aspect, the application provides a farad capacitor protection circuit for a control module adopting an anti-latch control mechanism of time-sharing power-on, comprising: a first control switch, a second control switch and a voltage reference unit.

[0007] The first end of the first control switch is connected to the positive electrode of the farad capacitor, the second end of the first control switch is connected to the internal main power supply end, and the internal main power supply end is connected to the control module.

[0008] The input end of the second control switch is connected to the internal main power supply end, and the output end of the second control switch is connected to the control end of the first control switch.

[0009] The voltage reference unit is connected with the control end of the second control switch and the internal main power supply end, and is used for controlling the connection state of the second control switch based on the voltage of the internal main power supply end.

[0010] Optionally, the input end of the voltage reference unit is connected with the internal main power supply end after being connected with the resistance R8 and the resistance R5 in series; the control end of the voltage reference unit is connected with the first node between the resistance R8 and the resistance R5; the output end of the voltage reference unit is connected with the first end of the resistance R6, and the second end of the resistance R6 is connected with the internal main power supply end; the voltage reference unit is connected with the first end of the resistance R7, and the second end of the resistance R7 is connected with the control end of the second control switch.

[0011] Optionally, the first control switch is a relay, the first end of the coil of the relay is connected with the output end of the second control switch, and the second end of the coil is grounded.

[0012] Optionally, the second control switch is a PMOS tube.

[0013] Optionally, the first end of the coil is connected with the negative electrode of the diode D3, and the positive electrode of the diode D3 is connected with the second end of the coil.

[0014] Optionally, the internal main power supply end is connected with the negative electrode of the diode D1, and the positive electrode of the diode D1 is connected with the positive input end of the external power supply.

[0015] Optionally, the second end of the first control switch is connected with the positive electrode of the diode D2, and the negative electrode of the diode D2 is connected with the internal main power supply end.

[0016] Optionally, the second end of the first control switch is also connected with the first end of the current-limiting resistance module, and the second end of the current-limiting resistance module is connected with the negative electrode of the diode D1.

[0017] In a second aspect, the application further provides a control module adopting a time-sharing power-on anti-locking control mechanism, and the control module adopts the farad capacitor protection circuit.

[0018] In a third aspect, the application further provides an electronic device, and the electronic device adopts the farad capacitor protection circuit.

[0019] Compared with the prior art, the utility model has the following beneficial effects:

[0020] The utility model provides a kind of farad capacitor protection circuit, control module and a kind of electronic equipment, this farad capacitor protection circuit, for using time-sharing power-on anti-latch control mechanism's control module, comprising: first control switch, second control switch, voltage reference unit;The first end of the first control switch connects the anode of farad capacitor, the second end of the first control switch connects internal main power supply end, and the internal main power supply end connects the control module;The input end of the second control switch connects the internal main power supply end, and the output end of the second control switch connects the control end of the first control switch;The control end of the second control switch and the internal main power supply end are connected to the voltage reference unit, for controlling the intercommunication state of the second control switch based on the voltage of the internal main power supply end.Such can, by voltage reference unit monitoring the voltage of internal main power supply end and comparing with threshold value.When the voltage of internal main power supply end is below threshold value, control second control switch is off, and then disconnect first control switch, so that farad capacitor is no longer for internal main power supply end auxiliary power supply, to avoid the problem of abnormal oscillation cycle, in addition, farad capacitor will not appear over-discharge, prolong service life, improve reliability. BRIEF DESCRIPTION OF DRAWINGS

[0021] In order to make the technical personnel of the present technical field better understand the present application scheme, the technical scheme in the present application embodiments will be described clearly and completely below in conjunction with the drawings in the present application embodiments. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by the ordinary skilled in the art without creative labor are within the scope of protection of the present application.

[0022] Figure 1 A structure schematic view of the farad capacitor protection circuit provided by the present application is shown in the figure.

[0023] Figure 2 A schematic block diagram of the control module using time-sharing power-on anti-latch control mechanism provided by the present application is shown in the figure.

[0024] Figure 3 A control module structure schematic view without farad capacitor protection circuit provided by the present application is shown in the figure. DETAILED DESCRIPTION

[0025] In order to make the technical personnel of the present technical field better understand the present application scheme, the technical scheme in the present application embodiments will be described clearly and completely below in conjunction with the drawings in the present application embodiments. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by the ordinary skilled in the art without creative labor are within the scope of protection of the present application.

[0026] Referring to Figure 1 Fig. 1 is a structural schematic diagram of a farad capacitor protection circuit, and the farad capacitor protection circuit is used for a control module adopting a time-sharing power-on anti-latch control mechanism, and the farad capacitor protection circuit comprises a first control switch, a second control switch and a voltage reference unit U1.

[0027] A first end of the first control switch is connected with a positive electrode of a farad capacitor, a second end of the first control switch is connected with an internal main power supply end, and the internal main power supply end is connected with the control module.

[0028] The internal main power supply end can be connected with an external power supply to supply power to the control module, and the farad capacitor can supply auxiliary power when the external power supply is powered off.

[0029] Optionally, the first control switch can adopt a relay, and referring to the relay K1 in Fig. 1, a first end of a coil of the relay K1 is connected with an output end of the second control switch, and a second end of the coil is grounded. Figure 1

[0030] The control module can be an integrated module in which a micro-controller unit (MCU) and peripheral devices are packaged. The micro-controller unit is a core part of the control module, and the MCU can be integrated with a central processing unit (CPU), a random access memory (RAM), a read-only memory (ROM), an input / output interface (I / O), a timer / counter and various functional components. The peripheral device can be a part that sends a control signal to the core part of the control module after the core part is powered on and is powered on. For example, the peripheral device can be a sensor, an actuator (such as a motor driver, a relay and the like) and the like.

[0031] An input end of the second control switch is connected with the internal main power supply end, and an output end of the second control switch is connected with a control end of the first control switch.

[0032] Optionally, the second control switch can adopt a PMOS tube, and referring to Q3 in Fig. 1. Figure 1

[0033] The voltage reference unit U1 is connected with the control end of the second control switch and the internal main power supply end, and is used for controlling a connection state of the second control switch based on a voltage of the internal main power supply end.

[0034] ​​The voltage reference unit U1 is provided with a threshold value. When the external power supply is powered off, the farad capacitor assists the internal main power supply end to maintain the voltage of the internal main power supply end close to the voltage when the external power supply is powered on. As the charge of the farad capacitor is consumed, the voltage reference unit U1 monitors that the voltage of the internal main power supply end is lower than the threshold value, controls the second control switch to be turned off, and then disconnects the first control switch, thereby protecting the farad capacitor, suspending the power supply of the farad capacitor to the internal main power supply end, avoiding over-discharge of the farad capacitor, prolonging the service life of the farad capacitor, improving the reliability, and avoiding abnormal oscillation cycle in the control module.

[0035] Based on the above Figure 1 The circuit structure of the voltage reference unit U1 and the second control switch can be as follows:

[0036] The input end of the voltage reference unit U1 is connected to the internal main power supply end in series with the resistor R8 and the resistor R5. The control end of the voltage reference unit U1 is connected to the first node between the resistor R8 and the resistor R5. The output end of the voltage reference unit U1 is connected to the first end of the resistor R6, and the second end of the resistor R6 is connected to the internal main power supply end. The voltage reference unit U1 is connected to the first end of the resistor R7, and the second end of the resistor R7 is connected to the control end of the second control switch.

[0037] The input end of the voltage reference unit U1 is connected to the first end of the resistor R8, the second end of the resistor R8 is connected to the first end of the resistor R5, the second end of the resistor R5 is connected to the internal main power supply end, and the control end of the voltage reference unit U1 is connected to the second end of the resistor R8.

[0038] Optionally, the negative electrode of the diode D1 is connected to the internal main power supply end, and the positive electrode of the diode D1 is connected to the positive input end of the external power supply.

[0039] The external power supply can be a direct current power supply, and the diode D1 realizes the one-way conduction of the power supply from the external power supply to the internal main power supply end.

[0040] Optionally, the second end of the first control switch is connected to the positive electrode of the diode D2, and the negative electrode of the diode D2 is connected to the internal main power supply end.

[0041] The diode D2 realizes the one-way conduction of the auxiliary power supply from the farad capacitor to the internal main power supply end.

[0042] Optionally, the second end of the first control switch is further connected to the first end of the current limiting resistor module, and the second end of the current limiting resistor module is connected to the negative electrode of the diode D1.

[0043] Referring to Figure 1 The current limiting resistor module can include the resistor R9 and the resistor R10 connected in series.

[0044] Optionally, the first end of the coil is connected to the negative pole of a diode D3, and the positive pole of the diode D3 is connected to the second end of the coil.

[0045] Based on the above embodiments, the application further provides a control module adopting a time-sharing power-on anti-latching control mechanism, and the control module adopts the farad capacitor protection circuit according to any one of the above embodiments.

[0046] Optionally, the negative pole of the energy storage filter electrolytic capacitor E1 is connected to the negative pole of the external power supply, the positive pole of the E1 is connected to the negative pole of the diode D1, and the negative pole of the E1 is also connected to the ground.

[0047] Specifically, referring to the schematic block diagram of a control module adopting a time-sharing power-on anti-latching control mechanism shown in Figure 2 The above control module can include an external power supply, a rectification anti-reverse module, a voltage detection module, a farad capacitor power supply control switch, a farad capacitor, a core part of the control module, peripheral peripherals of the control module, and a peripheral peripheral power supply control switch.

[0048] The rectification anti-reverse module can include the diode D1.

[0049] The voltage detection module (which can refer to the part in the dashed box in Figure 1 ) in combination with the farad capacitor power supply control switch (which can correspond to the first control switch in Figure 1 ) can adopt the protection circuit described above. The farad capacitor power supply control switch can include the first control switch described above, and the voltage detection module can include the voltage reference unit U1 described above to monitor the voltage of the internal main power supply end and control the farad capacitor power supply control switch to stop supplying power in time before over-discharge.

[0050] The power supply end of the core part of the control module is the internal main power supply end, and the internal main power supply end also connects the peripheral peripheral power supply control switch to supply power to the peripheral peripherals. After the core part of the control module is powered on, the peripheral peripheral power supply control switch is turned on to supply power to the peripheral peripherals by the internal main power supply end. The control module sends a control signal PMIC_ON_REQ to the peripheral peripheral power supply control switch, and the related circuit structure of the peripheral peripheral power supply control switch (such as the PMOS tube Q1 in Figure 1 ) can refer to Figure 1, specifically can include NMOS tube Q2, the G pole of Q2 is connected with the first end of resistor R3, the second end of resistor R3 is used for receiving control signal PMIC_ON_REQ, the S pole of Q2 is connected with the first end of resistor R4, the second end of resistor R4 is connected with the first end of resistor R3, the S pole of Q2 is also connected with ground, the D pole of Q2 is connected with the first end of resistor R2, the second end of resistor R2 is connected with the G pole of Q1, the first end of resistor R2 is connected with the first end of resistor R1, the second end of resistor R2 is connected with the first end of capacitor C1, the first end of resistor R1 and the second end of capacitor C1 are both connected with the S pole of Q1, and the D pole of Q1 is the power supply end of the peripheral peripheral device.

[0051] Referring to Figure 1 and Figure 2 After the protection circuit of the farad capacitor is set, the voltage reference unit U1 with adjustable threshold value is used to automatically control the first control switch, to automatically control the input and cut-out of the farad capacitor, when the front-end external power supply is powered on, the voltage reference unit U1 detects that the internal main power supply end VCC voltage is higher than the set threshold value at this time, sends a control signal to turn on the coil power control switch Q3 of K1, generates VCC_K voltage to supply power to the relay switch K1 coil to close the K1 contact (D3 is the freewheeling diode of the K1 coil), and the farad capacitor is put into the circuit, so that the farad capacitor is charged through current-limiting resistors R9 and R10, and at the same time, the external power supply also supplies power to the core part of the control module through VCC, and the core part of the control module works stably, and sends a control signal PMIC_ON_REQ to open the peripheral peripheral device power supply switch Q1, generates VCC1 to supply power to the peripheral peripheral device, so as to complete the power-on process.

[0052] When the external power supply DC_IN+, DC_IN- is powered off, because the first control switch K1 of the farad capacitor is in a closed state after power-on, the farad capacitor voltage is charged to be close to the voltage of the external power supply, so at this moment, the current output by the farad capacitor through D2 maintains the VCC voltage, and the power supply is continuously carried out, when the VCC voltage is lower than the threshold value set by the voltage reference unit U1, the voltage reference unit U1 sends a control signal to close the control switch Q3 to cut off the K1 coil power supply, so that the K1 contact is disconnected, the farad capacitor is cut out, and the power supply to the control module is suspended, after the farad capacitor is cut out, there is no voltage on VCC, the whole system loses power supply, the control module is powered off, and the peripheral peripheral device is powered off. After the farad capacitor is cut out, its own voltage will also rise, but at this time the capacitor has been cut out, so the whole circuit system will not appear repeated power-on oscillation, and the farad capacitor voltage after being completely cut out from the system will not be lower than the set threshold voltage, so the farad capacitor will not be over-discharged, which is very helpful to improve its service life and reliability.

[0053] Over-discharge of a supercapacitor refers to the phenomenon where a supercapacitor should discharge at a reasonable minimum voltage. Once this minimum voltage is reached, the discharge should stop. Unrestricted discharge until all the charge is discharged is called over-discharge. This affects the capacitance and lifespan of the capacitor, and over time, it will lead to a decrease in capacitance and a shorter lifespan.

[0054] For example, if the aforementioned protection circuit for the supercapacitor is not installed, repeated power-on oscillations may occur, see [reference needed]. Figure 3 The diagram shows a control module structure without a supercapacitor protection circuit. Specifically, when the external power supply fails, the supercapacitor normally discharges through D2 to power the core of the control module and peripheral devices. At this time, the VCC voltage is the supercapacitor voltage minus the voltage drop across D2. When the VCC voltage drops below the control module's operating voltage, the control module stops working and sends a PMIC_ON_REQ control signal to turn off the peripheral device's control switch Q1, cutting off the peripheral device's power supply VCC1. After losing its external load, the supercapacitor's voltage quickly recovers, raising the VCC voltage back to the control module's normal operating voltage. The control module then restarts working. The PMIC_ON_REQ control signal turns on the power supply control switch for peripheral devices. After the peripheral devices are connected, their high power consumption will quickly pull down the voltage of the supercapacitor. When the VCC voltage is lower than the operating voltage of the control module, the control module will enter the shutdown process again. This cycle continues in an unstable oscillating state until the VCC voltage does not rise to the normal operating voltage of the control module after the peripheral device power switch is turned off. This oscillation state will then be resolved. After that, the supercapacitor will continue to discharge the stopped control module until the supercapacitor is completely discharged and enters an over-discharge state.

[0055] Therefore, based on the aforementioned supercapacitor protection circuit and a control module employing a time-sharing power-on anti-latching control mechanism, the control module and peripheral devices utilize time-sharing power-on to prevent latch-up. The supercapacitor extends the operating time of the control module after an external power supply failure. At low voltages, it prevents system instability and oscillation. Simultaneously, the supercapacitor is protected by a voltage detection module with a set threshold, avoiding excessive discharge, reducing capacitance decay, extending service life, and improving reliability.

[0056] Based on the above embodiments, this application also provides an electronic device that employs a supercapacitor protection circuit as described in any one of the above embodiments, or a control module employing a time-sharing power-on anti-latch-up control mechanism.

[0057] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0058] The above description of the disclosed embodiments enables those skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A Faraday capacitance protection circuit, characterized by, The control module for adopting time-sharing power-on anti-lock control mechanism comprises a first control switch, a second control switch and a voltage reference unit. The first end of the first control switch is connected with the positive pole of a farad capacitor, the second end of the first control switch is connected with an internal main power supply end, and the internal main power supply end is connected with the control module. The input end of the second control switch is connected with the internal main power supply end, and the output end of the second control switch is connected with the control end of the first control switch. The voltage reference unit is connected with the control end of the second control switch and the internal main power supply end, and is used for controlling the communication state of the second control switch based on the voltage of the internal main power supply end.

2. The circuit according to claim 1, wherein the input end of the voltage reference unit is connected with the internal main power supply end after being connected with a resistance R8 and a resistance R5 in series, the control end of the voltage reference unit is connected with a first node between the resistance R8 and the resistance R5, the output end of the voltage reference unit is connected with the first end of a resistance R6, the second end of the resistance R6 is connected with the internal main power supply end, the voltage reference unit is connected with the first end of a resistance R7, and the second end of the resistance R7 is connected with the control end of the second control switch. The internal main power supply end is connected with the negative pole of a diode D1, and the positive pole of the diode D1 is connected with the positive pole input end of an external power supply.

3. The circuit of claim 2, wherein, The second end of the first control switch is connected with the positive pole of a diode D2, and the negative pole of the diode D2 is connected with the internal main power supply end.

4. The circuit of claim 3, wherein, The second end of the first control switch is also connected with the first end of a current-limiting resistance module, and the second end of the current-limiting resistance module is connected with the negative pole of the diode D1.

5. The circuit of claim 4, wherein, The first control switch is a relay, the first end of the coil of the relay is connected with the output end of the second control switch, and the second end of the coil is grounded.

6. The circuit of claim 2, wherein, The first end of the coil is connected with the negative pole of a diode D3, and the positive pole of the diode D3 is connected with the second end of the coil.

7. The circuit of claim 6, wherein, The second control switch is a PMOS tube.

8. The circuit of claim 2, wherein, The farad capacitor protection circuit according to any one of claims 1-8.

9. A control module employing a time-sharing power-on anti-lock-up control mechanism, characterized in that, The farad capacitor protection circuit according to any one of claims 1-8.

10. An electronic device, comprising: ​

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