JPH01271947A - Power source controller - Google Patents

Abstract

PURPOSE:To eliminate the inconvenient action of equipment when a power source is turned off and to decrease the consumption of power after the power source is turned off by providing in parallel a mechanical main switch to be switched manually and a sub-switch to be switched electrically. CONSTITUTION:When a mechanical main switch 2 is turned off manually after the equipment is used, the power of a charging battery 1 is supplied to a control circuit system 3 and a control microcomputer 4 through a sub-switch 7. Consequently, a monitor signal SW of the switch 2 becomes high-level and the turn-off of the switch 2 is detected and the computer 4 sets the circuit system 3 in a prescribed condition, for example, in the condition where the iris of the lens of a mechanism part 6 is closed. After that, the computer 4 makes a sub-switch control signal PC low-level and switches off the switch 7. Thus, the inconvenient action of the equipment when the power source is turned off is eliminated and the consumption of the power after the power source is turned off is decreased.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a power supply control device that is very effective when used in, for example, a portable VTR-integrated camera powered by a battery.

[JfA key points for invention]

For example, the present invention can be applied to a porta-pull type V powered by a battery.
This is an extremely effective power supply control device used in TR-integrated cameras, etc., which connects a manually switched mechanical main switch and an electrically switched sub switch in parallel between the power supply, control circuit system, and control microcomputer. When the control microcomputer detects that the main switch is turned off, the control circuit system is set to a predetermined state and then the sub switch is turned off. In addition to eliminating the inconvenient operation of the equipment during operation, it also reduces power consumption as much as possible after the power is turned off.

[Conventional technology]

2. Description of the Related Art Devices powered by secondary batteries (rechargeable batteries) or primary batteries, such as portable VTR-integrated cameras, are becoming widespread. In these battery-powered devices, how to reduce power consumption has become a problem, and various power-saving power control devices have been proposed.

The most commonly used power supply control device in the past is a device that forces the supply of power from the battery to the control circuitry by operating an auxiliary mechanical switch when battery-powered equipment is no longer in use. It was designed to be cut off.

In addition, it is customary these days to use a microcomputer to control the entire system, and when the use of battery-powered equipment is finished, the microcomputer used to control it can be operated by turning off the power on the keyboard. There is also a device in use in which the control microcomputer cuts off the power supply to other control circuit systems by notifying the control circuit. In the case of the latter device, the control microcomputer itself was kept supplied with power (a so-called active state) in preparation for the next key input.

[Problem to be solved by the invention]

However, among such conventional power supply control devices, when the power is cut off with only a manual mechanical switch, for example, in the case of a VTR-integrated camera, the iris on the camera side remains open and the iris on the camera side remains open. There have been disadvantages such as noise being emitted or the granger remaining held (in the case of a hold type granger).

In addition, devices using a control microcomputer have the disadvantage that even when the power is turned off, the control microcomputer itself and peripheral circuits such as the I/O Kaiyp-7 Ace always consume a certain amount of power. I was disappointed. In this case, some control microcomputers can be set to low power consumption modes (sleep mode, stop mode, etc.), but some power is still consumed, and the power consumption of peripheral circuits is limited. A method has been proposed in which the power source is separated into a general power source and a driving source and a power switch is provided for each, but this method has the disadvantage that the circuit configuration becomes complicated.

Furthermore, Japanese Patent Laid-Open No. 173658/1983 discloses a circuit that uses main and sub microcomputers to prevent malfunctions when the power is turned on, but it has the disadvantage that multiple microcomputers are required. .

The present invention was made in view of the above-mentioned problems, and its purpose is to eliminate the inconvenient operation of equipment when the power is turned off, and to reduce power consumption as much as possible after the power is turned off. [Proposing a source control device]

[Means to solve the problem]

For example, as shown in FIG. 1, the power supply control device according to the present invention includes a mechanical main switch (2) that is manually switched between a power supply (1), a control circuit system (3), and a control microcomputer (4). and an electrically switching sub-switch (7) are provided in parallel, and when the control microcomputer (4) detects that the main switch (2) of the oven is turned off, the control circuit system (3) is switched on. After setting the predetermined state, the sub switch (7) is pressed to turn off.

[Effect]

According to the present invention, even if you manually turn off the mechanical main switch (2) after using the device! # is supplied to the control circuit system (3) and the control 1-microcomputer (4) via the sub switch (7). Therefore, after the control microcomputer (4) detects that the main switch (2) has been turned off, it sets the control circuit system (3) to a predetermined state, such as when the iris of the camera is closed. This eliminates inconvenient device operation when the power is turned off.

After that, the control microcomputer (4) also turns off the sub switch (7), so that power is no longer supplied not only to the control circuit system (3) but also to the control microcomputer (4) itself. Therefore, the power consumption after the power is turned off can be reduced compared to the conventional kettle that uses only a mechanical switch. [Example] An example of the power supply control device of the present invention will be described below with reference to Figs. 1 to 3. Let's explain with reference to.

FIG. 1 shows an example in which the power supply control device of this example is applied to a portable VTR integrated camera.
In (1), the power supply voltage is E. It is a rechargeable battery (approximately 12V in this example). Connect the negative terminal (1M) of this rechargeable battery (1) to the ground line, and connect the positive terminal (1M) to the ground line.
M child (lb)? The fixed contacts (2a) and movable contacts (2a) of the mechanical main switch (2) are connected to the power input terminals of the b-path system (3) and the control microcomputer (μCOM) (4), respectively. This control μCOM (4) gives various commands to the control circuit system (3) via the system path (5), and the control circuit system (3) follows these commands to control the camera, camera iris, f-ranger, etc. The mechanism section (6) consisting of a video head, etc. is fully driven.

This control μCOM (4) has a power supply voltage Vcc y! t:
Built-in DC voltage converter to lower Wr to a constant level.

Also, a rechargeable badge! The positive terminal (1b) of J-(1) is a sub switch (7) installed in parallel with the main switch (2).
The output terminal (7b) of the sub switch (7) is connected to the input terminal (7m) of the main switch (2J movable contact (2c)
).

Therefore, when the movable contact (2c) of the main switch (2J) is switched to the fixed contact (mu) side, the voltage of the movable contact (2c) is approximately equal to the voltage Eo of the rechargeable battery (1). No, the movable contact (2c) is the fixed contact (2b)
(jl When K is switched and the sub switch (7) is on, the voltage of its movable contact (2c) is the voltage appearing at the output terminal (7b) of the sub switch (7). The voltage appearing at the movable contact (2o) is applied to the control circuit (
3) and the power supply voltage vcc of the control microcomputer (4).

In addition, the sub switch (7) is connected to Darlington and 7'j2
It is composed of transistors Ql, Q2 and resistors R1, R2, R3 for setting bias current. A sub-switch (NPN switching transistor for turning η on and off) transistor Q3 and resistors R4 and R5 for setting the bias current of this transistor Q3 are provided. The first control μCOM (4) is the output terminal OU.
A sub-switch control signal PC is output from T, and this sub-switch control signal PC is connected to transistor Q3 via resistor R4.
supply to the base of Therefore, when the sub-switch control signal (!!a) is at high level "l", the sub-switch (7) is in the on state, and when the sub-switch control signal PC is at low level rOJ, the sub-switch (7) is in the on state. The state of

In this example, in order to monitor the open/close state of the main switch (2) by the control μCOM (4), the main switch monitor signal SW, which is a signal appearing at the other fixed contact (2b) of the main switch (2), is used. Input to the input terminal IN of the control μCOM (4). Also, its fixed contact (2b)
is grounded (pull down) through resistor R6. Therefore, the movable contact (2a) of the main switch (2) is connected to the fixed contact (2).
M) When switching to lit (turning on the main switch (2)), the main switch monitor signal source is set to low level "0".

After that, the movable contact C2ts”)t- of the main switch (2)
When fixed contact (2b) is switched to 1llll (main switch (2) t-off, λ sub switch (7) is on, main switch monitor signal reading is high level rlJ
Changes to Therefore, μCOM (4) can detect the open/closed state of the main switch (2) depending on the state of the main switch monitor signal SW.

Here, the operation f of the power supply control device of this example: FIGS. 2 and 3
To explain with reference to the figure, when this device is not in use, the movable contact (2c) of the main switch (2) is set to the fixed contact (2b) side (the main switch (2) is turned off). The 1st secondary switch (7th switch is also turned off).

In this case, K, who uses the equipment, first manually switches the movable contact (2c) of the main switch (2) to the fixed contact (2A) side at time t0, as shown in Figure 2 AK, and then Turn on (Stella f(loo)). At this time, the control μ
The power supply voltage system of COM (4) starts rising from time to and is rechargeable batch! J-(1) Voltage E. Since K becomes equal (FIG. 3A), vJ #COM (4) K starts operating due to power-only operation (step (101)). After that, control μCOM (4) [X? 7'
(102), and at time t1, the sub switch control signal P
Set C to high level rlJ (Fig. 3B) and turn on the small switch (η.However, at this point, the main switch (2) is on and the input terminal of the sub switch (7) Since the same voltage E is applied to the output terminal (7a) and the output terminal (7b), no current flows to the sword switch (7).While this initial operation is completed, the control μCOM (
Step 4) moves to the main routine shown in FIG. 2B.

In the first step (104) of this main routine,
The control μCOM (4) checks whether the main switch monitor signal sw is at high level "1". Main switch (
2) is on, the main switch monitor signal is at a low level "0", so the control μCOM (4) moves to step (105) and performs normal processing. Normal processing refers to, for example, operating the camera and video head in the mechanism section (6) via the control circuit system (3J) during recording.When this normal processing is completed, the control J
COM (4) returns to Stella 7" (104) again, so in normal use, the control μCOM (4) changes from Stella f (104) → Step (105) → Stella f (
104) →... goes around the loop f.

After this, when you finish using the device and shut off the power, at time t2, manually switch the main switch (2J movable contact (2C) to the fixed contact (2b) @ Jl'C and turn the main switch <
23 T-Turn off. In this case, as shown in FIG. 3A, the power supply voltage vcc is supplied from the rechargeable battery (1) through the sub switch (7), so the collector-emitter of the transistor/Ql in the shaving switch (7) Although the power supply voltage decreases by ΔE corresponding to the inter-voltage voltage, there is no problem with the operation of the control circuit system (3) and the control μCOM (4). Also, since the fixed contact (2b) of the main switch (2) is connected to the movable contact (2+), the main switch monitor signal S
W becomes a high level rlJ at time t2 (FIG. 3C).

In this case, at step (104) in FIG. 2B, the control μCOM (4) moves to step (106) and sets the control circuit system (3) to a predetermined state. In this example, "setting to a predetermined state" means that the iris of the lens in the mechanism part (6) is closed, the plunger is released, and the control circuit system (3) is set so that transient noise is not emitted.
). K for setting the control circuit system (3) to a predetermined state requires time T from time t2.

After this, the control μCOM (4) is Stella 7' (107)
At time t5 (xt2+r), the print switch control signal PS is set to low level "0" and the sub switch (
7) is turned off (Figure 3B). Therefore, the main switch (
2) and the auxiliary switch (7) are both turned off, the power supply voltage VCe decreases by KK to 0. Power supply voltage VCC
The reason why K does not change rapidly is that a large-capacity capacitor is usually connected to the power supply line of the control circuit system (3), etc.

In this example, the power supply voltage VCC is used as it is for the control μCO.
Since it is also the power supply voltage of M (4) itself, when the power supply voltage - becomes O, the control μCOM (4) itself also stops operating. In this case, in a transient state when the power supply voltage - becomes OK, if the control μCOM (4) goes out of control and sets the sub-switch control signal PCt to irregular rlJ, the sub-switch (7) When the power is turned on again, the power supply voltage rises. In this example, in order to avoid such a situation, the program is created so that the control μCOM (4) is activated only immediately after the auxiliary switch control signal PC is set to a high level rlJK. Furthermore, the operation of the control μCOM (4) after the sub switch (7) is turned off in step (107) may be set to "halt (stop) mode", but in this example,
82 As shown in FIG. 1, the process returns to step (104) again. It has been confirmed that even with such a program, when the power supply voltage - becomes 0, the control μCOM (4) stops operating without running out of control. In this way, the power supply voltage is OK.
After this, in principle, no power is consumed in the power supply control device of this example, including the control μCOM (4).

As mentioned above, in the power supply control device of this example, the mechanical main switch (2) is manually turned off and the control circuit system (4) is set to a predetermined state during the time T after death, and the camera is turned off. Since operations such as closing the iris are performed, there is an advantage that there is no inconvenient operation of the device when the power is turned off.

In addition, in this example, after setting the control circuit system (4) to a predetermined state, the sub switch (7) is also turned off to supply power to the equipment, so no power is consumed from then on. There is profit.

In particular, in this example, the power supply to the control μCOM (4) itself is also cut off, so the power consumption after the power is turned off is OK in principle, and the control μCOM (4) is in a low power consumption mode. It also has the advantage that a normal i-microcomputer without a computer can be used.

Next, another embodiment of the power supply control device of the present invention will be described with reference to FIG. In FIG. 4, parts corresponding to those in FIG. 1 are designated by the same reference numerals, and detailed explanation thereof will be omitted.

The example in Figure 4 is the sub switch (
7) Replace with t-relay switch (8) In Figure 4, Q4 is a transistor for opening and closing the relay switch (8) R7 and R8 are resistors for setting bias current, etc. It is. μCOM for control
Since the sub-switch control signal PC in (4) is supplied to the pace of the transistor Q4 via the resistor R8, when the sub-switch control signal PCt is set to high level rlJ, the relay operates and the input terminal (8a) and output The terminal (8b) is electrically connected and the relay switch (8) is turned on. Also,
When the sub-switch control signal PCt--low level is set to "0", the relay switch (8) is turned off. Therefore, since the relay switch (8) in the example of FIG. 4 has the same function as the sub-switch (7) in the example of FIG. 1, the example of FIG. 4 has the same effect as the example of FIG. 1.

According to the power control device shown in the example in Figure 1g4, the relay switch (
8) is used, so even if you manually turn off the main switch (2) while the main switch (2) and relay switch (8) are on, there will be no voltage drop due to power supply voltage change. There is a benefit.

In addition, in the above embodiment, a rechargeable battery (
Although υ is used, the present invention is not limited thereto, and is also applicable to equipment that uses a primary battery such as a dry battery as a power source.

Note that the power supply control device of the present invention is not limited to the above-mentioned embodiments.
Of course, changes can be made without departing from the gist of the invention.

〔Effect of the invention〕

Since the power supply control device of the present invention is configured as described above, inconvenient operation of the equipment when the power is turned off is eliminated, and
There is an advantage that power consumption after the power is turned off can be reduced as much as possible.

[Brief explanation of the drawing]

FIG. 1 is a configuration diagram showing an example of the power supply control device of the present invention, and FIG.
Figure A is a flowchart diagram for explaining the operation when the power is turned on in the example in Figure 1, w, Figure 2 is a 70-chart diagram for explaining the operation when the power is turned off, and Figure 3 is a flowchart diagram for explaining the operation when the power is turned on. FIG. 4 is a configuration diagram showing another example of the power supply control device of the present invention. (1) is a rechargeable patch 17-, (2J is a mechanical main switch, (3) is a control circuit system, (4 is a control microcomputer, (7) is a sub switch, and (8) is a sub switch. It is a relay switch.

Claims (1)

[Claims] A manually switched mechanical main switch and an electrically switched sub switch are provided in parallel between the power source, the control circuit system, and the control microcomputer, and the control microcomputer detects when the main switch is turned off. A power supply control device characterized in that, when detected, the sub switch is turned off after setting the control circuit system to a predetermined state.