CN2574300Y - Protection circuit device for power system - Google Patents

Abstract

The utility model relates to a power supply system's protection circuit device can use in the circuit that generally has power supply system, especially the switching action of protection power. The utility model comprises a bounce-proof circuit, a selection circuit, a maintaining circuit and an isolation circuit. The anti-bounce circuit receives an input signal after a bounce switch is activated, and eliminates a possible malfunction caused by a chattering phenomenon generated by the input signal. The selection circuit receives the output of the output end of the anti-bounce circuit and outputs a signal for controlling the on or off of a system power supply. The maintaining circuit can maintain the supply of a normal working power supply required in the subsequent connecting circuit. The isolation circuit can provide isolation to a main power supply and can receive an input signal to forcibly turn off the system power supply.

Description

Protection circuit device for power system

(1) Technical field

The utility model relates to a protection circuit device of a power supply system, which can be applied in logic design circuits with a power supply system in general, especially to protect the switching action of the power supply.

(2) Background technology

General electronic information products are usually designed with a number of buttons or knobs for user input, including related designs for time setting, function selection, etc. When it comes to electrical appliances, manufacturers usually design a switch or button to activate the power supply. This type of power switch has a common disadvantage, that is, when the button is pressed and released by the user, because of its Structural barriers will generate some unnecessary noise or interference. If the noise is quite large, it will cause misjudgment of the entire system and cause wrong actions, which will affect the performance of the overall system.

Please refer to Figure 1 for a schematic diagram of chattering phenomena in existing switches. As shown in Figure 1, a switch 10 is usually connected to a power supply terminal Vcc after being connected to a resistor 11. When the switch is pressed and released, the vibration phenomenon will be shown as 12 and 13 in the waveform diagram on the right. When the switch is not pressed, the waveform at point a should become a high potential, and it should become a low potential immediately after being pressed, but due to structural factors, the jitter phenomenon generated during the process, that is, as shown in 12, there will be several An unstable pulse is generated. The generation of these pulses will make the whole system think that it is a normal switch action and cause misjudgment. 13 shows that when the switch is pressed and released, it will also cause jitter.

(3) Contents of utility model

The utility model is an improved design for solving the above-mentioned shortcoming of the prior art. The main purpose of the present utility model is to use the design of the trigger and the combination of several components to provide a mechanism to prevent the erroneous action caused by the tremor phenomenon caused by the push button switch (push button) being turned on and off, and It is a safety protection mechanism to prevent damage caused by sudden surge phenomena in the outside world, so that the power supply of the circuit or product to which the utility model is applied can be protected in a safe and stable operation, and then protect the normal operation of the entire system.

Yet another object of the present invention is to provide a manually operated toggle switch control and to provide a functional option, including a switch control system for manual operation or conditional selectivity.

The protection circuit device of the power supply system of the utility model includes an anti-bounce circuit, a selection circuit, a maintenance circuit and an isolation circuit. The anti-bounce circuit accepts the input signal after a bounce switch is activated, and eliminates the possible malfunction caused by the tremor phenomenon generated by the input signal, so that the subsequent circuit will not be damaged by the tremor phenomenon of the input signal. Malfunction occurs.

The selection circuit accepts the output of the output terminal of the anti-bounce circuit, connects the maintaining circuit and the isolation circuit, and outputs a control signal for turning on or off a system power supply. Preferably, the selection of the internal resistance of the selection circuit can be used, so that the output signal can be a signal of a manually controllable switch, or a trigger and conduction signal of a click circuit.

The maintaining circuit is connected with the anti-bounce circuit, the selection circuit and the isolation circuit, and makes the supply of a normal working power required by the subsequent connection circuit continue.

The isolation circuit is connected to the anti-bounce circuit, the selection circuit and the maintenance circuit, which can provide isolation to a main power supply, and when the system power supply is to be forcibly shut down, it can receive an input signal to forcibly shut down the system power supply.

The design of the utility model has the following advantages:

a. It can eliminate the signal error situation for the chattering phenomenon caused by the bouncing of the push button switch (push button).

b. Can provide control of manually operated toggle switch (toggle) action.

c. Provide one-click logic control for non-warning power-off actions to prevent unknown errors or damages.

d. Provides a shutdown logic circuit to protect the system from sudden system power error conditions.

e. An optional function can be provided, including a switch control system that is manually operated or based on conditional selection.

In order to further illustrate the above purpose, structural features and effects of the present utility model, the utility model will be described in detail below in conjunction with the accompanying drawings.

(4) Description of drawings

FIG. 1 is a schematic diagram of a chattering phenomenon in a conventional switch.

Fig. 2 is a circuit block diagram of a preferred embodiment of the present invention.

Fig. 3 is a circuit diagram of a preferred embodiment of the utility model.

(5) specific implementation

The utility model relates to a protection circuit device for a power supply system, which can be applied to a logic design circuit with a power supply system, such as a computer or a general information product, especially for a push button switch (push button) in the circuit design. The utility model utilizes the design of the trigger and the combination of several components to provide a mechanism to prevent the erroneous action caused by the tremor phenomenon caused by the button switch being turned on and off, as well as the sudden wave phenomenon of the system in the outside world. The safety protection mechanism enables the power supply of the circuit or product to be applied with the utility model to be protected with safe and stable actions, and prevents the entire circuit from generating wrong actions, thereby protecting the entire system from working normally without causing wrong actions or Damage to the system caused by surge action.

Please refer to FIG. 2 , which is a circuit block diagram of a preferred embodiment of the present invention. As shown in FIG. 2 , the utility model includes an anti-bounce circuit 2 , a selection circuit 3 , a maintenance circuit 4 and an isolation circuit 5 . Wherein the anti-bounce circuit 2 is to receive a signal input after the bounce switch 200 is pressed, and eliminate the chattering phenomenon (chattering) generated by the input signal, so that the subsequent circuit will not be damaged by the chattering phenomenon of the input signal Malfunction occurs.

The selection circuit 3 accepts the output of the anti-bounce circuit 2, and connects the maintenance circuit 4 and the isolation circuit 5, and outputs a signal to control the opening or closing of a system power supply, wherein the selection of the internal components of the selection circuit 3 can also be used , so that the output signal is a signal of a manually controllable toggle switch (toggle switch), or a trigger conduction signal for a click circuit (not shown in the figure).

The maintenance circuit 4 is connected to the anti-bounce circuit 2 , the selection circuit 3 and the isolation circuit 5 , and enables a continuous supply of a normal working power required by subsequent connected circuits.

The isolation circuit 5 is connected to the anti-bounce circuit 2, the selection circuit 3 and the maintenance circuit 4, and provides isolation to a main power supply, and when the system power supply is to be forcibly shut down, it receives an input signal to shut down the system power supply.

Please refer to FIG. 3 , which is a circuit diagram of a preferred embodiment of the present invention. As shown in Figure 3, the anti-bounce circuit 2 is to accept the input signal after a bounce switch 200 is pressed, and can eliminate the tremor phenomenon generated by the input signal. The anti-bounce circuit 2 includes: a trigger 20, a resistor 21, 22, 23 and capacitors 24, 25, wherein one end of the resistor 22 is connected to a working power supply (STANDBY_VCC), the other end of the resistor 22 is connected in series with the capacitor 25, and the serial connection point A receives a switch via a resistor 26 The signal input by 200 is connected to point A in series and connected to a setting terminal (S) of flip-flop 20 through a capacitor 24 and to a pulse input terminal (CLK) of flip-flop 20 . Wherein the RC time formed by the resistor 22 and the capacitor 25 must be much longer than the RC time formed by the resistor 21 and the capacitor 24, so as to prevent the contention phenomenon of the flip-flop 20 and make the output state unstable, and the flip-flop 20-input The terminal (D) is connected to the ground terminal via a resistor 23, and an output terminal (Q-) of the flip-flop 20 outputs a switch state signal (TOGGLED_STATE), which can be used to identify whether the switch 200 is turned on or not. or non-conductive.

A pulse input (CLK) of a flip-flop 30 in the selection circuit 3 accepts the output of an output (Q) of the flip-flop 20 in the anti-bounce circuit 2, an input (D) of the flip-flop 30 and a setting The terminal (S) is connected to the working power supply (STANDBY_VCC) via a resistor 32 and a resistor 31 respectively, and the output signal (SYSYEM_ON/OFF) of an output terminal (Q) of the flip-flop 30 can be used to turn on or off a system power supply. control, and a resistor 33 between the input terminal (D) and the output terminal (Q-) can be connected or removed depending on the situation. For example, when the resistor 33 is connected, the selection circuit 3 can be made to form a click circuit, and the resistor 33 When connected, a pair of click signal conduction can be formed. If the resistor 33 is not connected, a manually toggle switch circuit can be formed. When the resistor 33 is not connected, an output terminal (Q) of the flip-flop 30 The output signal (SYSYEM_ON/OFF) of the output signal (SYSYEM_ON/OFF) can generate the control of turning on or off of a system power supply, that is, it can control the turn-on or cut-off of a switch signal in the purpose of the utility model. Therefore whether can resistance 33 be connected to test whether the design of the utility model is normal in the test process whether the circuit performance is normal, then resistance 33 can be removed after the test is finished, the utility model has been applied to actual circuit or product.

The sustain circuit 4 includes a diode 40 , a resistor 41 and a capacitor 42 . The anode (Anode) of the diode 40 is connected to a reset terminal (R) of the flip-flop 20 in the anti-bounce circuit 2, and is connected to a reset terminal (R) of the flip-flop 30 in the selection circuit 3 and is connected to the isolated The collector (C) of a transistor 50 in the circuit 5, the resistor 41 is connected to the diode 40 in parallel, and the cathode terminal (Kathode) connected in parallel to the diode 40 is connected to a working power supply (STANDBY_VCC), and the capacitor 42 is connected to the diode 40 The anode end of the anode terminal is then grounded, and the design of the diode 40, the resistor 41 and the capacitor 42 can maintain the supply of the system power in a stable state without easily changing.

The collector (C) of the transistor 50 in the isolation circuit 5 is connected to the reset terminal (R) of the flip-flops 20 and 30 and to the anode terminal of the diode 40, the resistor 51 and the capacitor 52 are connected, and the connection point thereof is connected to the transistor 50 The base (B) of the transistor 50 can provide a working bias for the operation of the transistor 50, and the emitter (E) of the transistor 50 can accept an external input of a forced power-off signal, for example, for sudden errors in the power detection process. A control signal (POWER_SYSTEM_FAILED_SHUT_OFF) for turning off the power supply or a control signal (MANUALLY_ENFORCED_SHUT_OFF) for manually turning off the power supply of the system. Transistor 50, resistor 51 and capacitor 52 can provide isolation to a power supply system, and when the system power supply is to be forcibly closed, the system power supply can be forcibly closed after receiving the above-mentioned input signal, and the timing delay signal can be Sequence off.

Wherein, the working power supply (STANDBY_VCC) in each power supply signal mentioned above refers to providing the power supply required by the utility model, and the output signal (SYSYEM_ON/OFF) refers to the control signal of a system power supply to be controlled and protected by the utility model , the main power supply (MAIN_VCC) refers to the main power supply from the system power supply, and the forced power off signal refers to a control signal (POWER_SYSTEM_FAILED_SHUT_OFF) to turn off the power supply for sudden errors in the power supply detection process , or refers to a control signal (MANUALLY_ENFORCED_SHUT_OFF) that can be manually operated to shut down the system power.

The above-mentioned flip-flop is a TTL logic circuit, which can be implemented with IC7474.

To sum up, through the structural features of the utility model and the detailed description of each embodiment, it fully shows that the utility model is highly progressive in terms of purpose and effect, and has great industrial utilization value.

Of course, those of ordinary skill in the art should recognize that the above embodiments are only used to illustrate the utility model, rather than as a limitation to the utility model, as long as within the spirit of the utility model, the above The changes and modifications of the embodiments will all fall within the scope of the claims of the present utility model.

Claims (8)

1. the protective circuit device of a power-supply system is characterized in that this protective circuit device includes:

One shellproof jumping circuit is the input of accepting a switching signal;

One selects circuit, is the output of accepting this shellproof jumping circuit, and exports a power control signal;

One keeps circuit, is to connect this shellproof jumping circuit and this selection circuit; And

One buffer circuit is to accept a power-off signal, and connects this shellproof jumping circuit, this selection circuit and this holding circuit.

2. as the protective circuit device of claim 1 a described power-supply system; it is characterized in that described shellproof jumping circuit is to comprise a trigger; one input of this trigger is via a grounding through resistance; one output of this trigger is to be connected to described selection circuit; another output of this trigger is output one switch state signal; one pulse input end of this trigger is the signal input of accepting the tie point of resistance and an electric capacity; it is the signal input of accepting the tie point of resistance and an electric capacity that one of this trigger is set end, and a replacement end of this trigger is to be connected to described holding circuit.

3. as the protective circuit device of claim 1 a described power-supply system; it is characterized in that described selection circuit is to comprise a trigger; one pulse input end of this trigger is the output of accepting described shellproof jumping circuit, and the output signal of an output of this trigger is the control signal of this power supply of output.

4. as the protective circuit device of claim 3 a described power-supply system, an input that it is characterized in that described trigger is an output that is connected to this trigger via a resistance.

5. as the protective circuit device of claim 1 a described power-supply system, it is characterized in that described holding circuit is to comprise a diode, the anode of this diode is to be connected to described shellproof jumping circuit, selection circuit and buffer circuit.

6. as the protective circuit device of claim 1 a described power-supply system, it is characterized in that described buffer circuit is to comprise a transistor, this transistorized collector electrode is to be connected to described shellproof jumping circuit, selection circuit and holding circuit.

7. as the protective circuit device of claim 6 a described power-supply system, it is characterized in that described transistorized collector electrode is a trigger, the trigger in the selection circuit and the diode in the holding circuit that is connected in the described shellproof jumping circuit.

8. as the protective circuit device of claim 6 a described power-supply system, it is characterized in that described transistorized emitter-base bandgap grading is can accept to import one to force the power-off signal.

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